diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index b20332c533..750b3ec86a 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -18,3 +18,6 @@ members = [
     "utils/hex",
     "utils/run-locally",
 ]
+
+# FIXME dependency conflicts between solana and hyperlane
+exclude = [ "sealevel" ]
diff --git a/rust/sealevel/.gitignore b/rust/sealevel/.gitignore
new file mode 100644
index 0000000000..ea8c4bf7f3
--- /dev/null
+++ b/rust/sealevel/.gitignore
@@ -0,0 +1 @@
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diff --git a/rust/sealevel/Cargo.lock b/rust/sealevel/Cargo.lock
new file mode 100644
index 0000000000..7ae2b4e451
--- /dev/null
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diff --git a/rust/sealevel/Cargo.toml b/rust/sealevel/Cargo.toml
new file mode 100644
index 0000000000..06df6c2f00
--- /dev/null
+++ b/rust/sealevel/Cargo.toml
@@ -0,0 +1,8 @@
+[workspace]
+members = [
+    "hyperlane-core",
+    "client",
+    "programs/mailbox",
+    "programs/recipient/echo",
+    "programs/ism/rubber-stamp",
+]
diff --git a/rust/sealevel/README.md b/rust/sealevel/README.md
new file mode 100644
index 0000000000..67ea441f04
--- /dev/null
+++ b/rust/sealevel/README.md
@@ -0,0 +1,39 @@
+# Hyperlane Sealevel (Solana VM) Integration
+
+## Build
+
+Contracts:
+
+```bash
+pushd programs
+cargo build-sbf --arch bpf
+popd
+```
+
+Test client:
+
+```bash
+pushd client
+cargo build
+popd
+```
+
+## Deploy and Test with Local Validator
+
+```bash
+solana-test-validator --reset
+```
+
+In a separate shell:
+
+```bash
+solana -u l program deploy target/deploy/hyperlane_sealevel_mailbox.so
+solana -u l program deploy target/deploy/hyperlane_sealevel_ism_rubber_stamp.so
+solana -u l program deploy target/deploy/hyperlane_sealevel_recipient_echo.so
+```
+
+```bash
+RUST_LOG=debug cargo run create-accounts
+RUST_LOG=debug cargo run send -m 100
+RUST_LOG=debug cargo run receive
+```
diff --git a/rust/sealevel/client/Cargo.lock b/rust/sealevel/client/Cargo.lock
new file mode 100644
index 0000000000..974a2caf4a
--- /dev/null
+++ b/rust/sealevel/client/Cargo.lock
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+ "winapi",
+]
+
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+dependencies = [
+ "asn1-rs",
+ "base64 0.13.1",
+ "data-encoding",
+ "der-parser",
+ "lazy_static",
+ "nom",
+ "oid-registry",
+ "rusticata-macros",
+ "thiserror",
+ "time 0.3.17",
+]
+
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+]
+
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+ "zeroize_derive",
+]
+
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+dependencies = [
+ "proc-macro2 1.0.47",
+ "quote 1.0.21",
+ "syn 1.0.103",
+ "synstructure",
+]
+
+[[package]]
+name = "zstd"
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+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "5.0.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d2a5585e04f9eea4b2a3d1eca508c4dee9592a89ef6f450c11719da0726f4db"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.1+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fd07cbbc53846d9145dbffdf6dd09a7a0aa52be46741825f5c97bdd4f73f12b"
+dependencies = [
+ "cc",
+ "libc",
+]
diff --git a/rust/sealevel/client/Cargo.toml b/rust/sealevel/client/Cargo.toml
new file mode 100644
index 0000000000..015cadcce2
--- /dev/null
+++ b/rust/sealevel/client/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "hyperlane-sealevel-client"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+borsh = "0.9"
+clap = { version = "4", features = ["derive"] }
+hyperlane-sealevel-mailbox = { path = "../programs/mailbox" }
+lazy_static = "1.4"
+pretty_env_logger = "0.4"
+solana-sdk = "=1.14.3"
+solana-client = "=1.14.3"
+solana-cli-config = "=1.14.3"
+solana-clap-utils = "=1.14.3"
diff --git a/rust/sealevel/client/src/main.rs b/rust/sealevel/client/src/main.rs
new file mode 100644
index 0000000000..5e0e5290a8
--- /dev/null
+++ b/rust/sealevel/client/src/main.rs
@@ -0,0 +1,420 @@
+//! Test client for Hyperlane Sealevel Mailbox contract.
+
+#![deny(warnings)]
+// #![deny(missing_docs)] // FIXME
+#![deny(unsafe_code)]
+
+use std::str::FromStr as _;
+
+use clap::{Args, Parser, Subcommand};
+use hyperlane_sealevel_mailbox::{
+    hyperlane_core::{message::HyperlaneMessage, types::H256, Encode},
+    accounts::{InboxAccount, OutboxAccount},
+    instruction::{
+        InboxProcess, Init as InitMailbox, Instruction as MailboxInstruction, OutboxDispatch,
+        MAX_MESSAGE_BODY_BYTES, VERSION,
+    },
+};
+use solana_clap_utils::input_validators::{is_keypair, is_url, normalize_to_url_if_moniker};
+use solana_cli_config::{Config, CONFIG_FILE};
+use solana_client::rpc_client::RpcClient;
+use solana_sdk::{
+    commitment_config::CommitmentConfig,
+    compute_budget::ComputeBudgetInstruction,
+    instruction::{AccountMeta, Instruction},
+    pubkey::Pubkey,
+    signature::{read_keypair_file, Signer as _},
+    system_program,
+    transaction::Transaction,
+};
+// Note: from solana_program_runtime::compute_budget
+const DEFAULT_INSTRUCTION_COMPUTE_UNIT_LIMIT: u32 = 200_000;
+const MAX_COMPUTE_UNIT_LIMIT: u32 = 1_400_000;
+const MAX_HEAP_FRAME_BYTES: u32 = 256 * 1024;
+
+// FIXME can we import from libs?
+lazy_static::lazy_static! {
+    static ref MAILBOX_PROG_ID: Pubkey = Pubkey::from_str(
+        "8oQPEeV1Uhmt4VNAdEojJewGnAuEi4pxBinbRvtKmiwJ"
+    ).unwrap();
+    static ref DEFAULT_ISM_PROG_ID: Pubkey = Pubkey::from_str(
+        "YpYBDE5EsueaooNiYjgQ5PWcX9EB7kBpo3uufdDeLi7"
+    ).unwrap();
+    static ref RECIPIENT_ECHO_PROG_ID: Pubkey = Pubkey::from_str(
+        "CFpo3LDZm2nPujHLoHNxtmY6WZwjKSVY78aMBYf9hLZE"
+    ).unwrap();
+}
+
+#[derive(Parser)]
+#[command(version, about)]
+struct Cli {
+    #[command(subcommand)]
+    cmd: MailboxCmd,
+    #[arg(long, short)]
+    url: Option<String>,
+    #[arg(long, short)]
+    keypair: Option<String>,
+    #[arg(long, short = 'b', default_value_t = MAX_COMPUTE_UNIT_LIMIT)]
+    compute_budget: u32,
+    #[arg(long, short = 'a')]
+    heap_size: Option<u32>,
+}
+
+#[derive(Subcommand)]
+enum MailboxCmd {
+    Init(Init),
+    Query(Query),
+    Send(Outbox),
+    Receive(Inbox),
+}
+
+#[derive(Args)]
+struct Init {
+    #[arg(long, short, default_value_t = *MAILBOX_PROG_ID)]
+    program_id: Pubkey,
+    #[arg(long, short, default_value_t = u32::MAX)]
+    local_domain: u32,
+}
+
+#[derive(Args)]
+struct Query {
+    #[arg(long, short, default_value_t = *MAILBOX_PROG_ID)]
+    program_id: Pubkey,
+    #[arg(long, short, default_value_t = u32::MAX)]
+    local_domain: u32,
+}
+
+#[derive(Args)]
+struct Outbox {
+    #[arg(long, short, default_value_t = u32::MAX)]
+    local_domain: u32,
+    #[arg(long, short, default_value_t = u32::MAX)]
+    destination: u32,
+    #[arg(long, short, default_value_t = *RECIPIENT_ECHO_PROG_ID)]
+    recipient: Pubkey,
+    // #[arg(long, short, default_value = "Hello, World!")]
+    // message: String,
+    #[arg(long, short, default_value_t = *MAILBOX_PROG_ID)]
+    program_id: Pubkey,
+
+    #[arg(long, short, default_value_t = MAX_MESSAGE_BODY_BYTES)]
+    message_len: usize,
+}
+
+#[derive(Args)]
+struct Inbox {
+    #[arg(long, short, default_value_t = u32::MAX)]
+    local_domain: u32,
+    #[arg(long, short, default_value_t = u32::MAX)]
+    origin: u32,
+    #[arg(long, short, default_value_t = *RECIPIENT_ECHO_PROG_ID)]
+    recipient: Pubkey,
+    #[arg(long, short, default_value = "Hello, World!")]
+    message: String,
+    #[arg(long, short, default_value_t = 1)]
+    nonce: u32,
+    #[arg(long, short, default_value_t = *MAILBOX_PROG_ID)]
+    program_id: Pubkey,
+    #[arg(long, default_value_t = *DEFAULT_ISM_PROG_ID)]
+    ism: Pubkey,
+}
+
+// Actual content depends on which ISM is used.
+struct ExampleMetadata {
+    pub root: H256,
+    pub index: u32,
+    pub leaf_index: u32,
+    // pub proof: [H256; 32],
+    pub signatures: Vec<H256>,
+}
+impl Encode for ExampleMetadata {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(self.root.as_ref())?;
+        writer.write_all(&self.index.to_be_bytes())?;
+        writer.write_all(&self.leaf_index.to_be_bytes())?;
+        // for hash in self.proof {
+        //     writer.write_all(hash.as_ref())?;
+        // }
+        for signature in &self.signatures {
+            writer.write_all(signature.as_ref())?;
+        }
+        Ok(32 + 4 + 4 + (32 * 32) + (self.signatures.len() * 32))
+    }
+}
+
+fn main() {
+    pretty_env_logger::init();
+
+    let cli = Cli::parse();
+    let config = match CONFIG_FILE.as_ref() {
+        Some(config_file) => Config::load(config_file).unwrap(),
+        None => Config::default(),
+    };
+    let url = normalize_to_url_if_moniker(cli.url.unwrap_or(config.json_rpc_url));
+    is_url(&url).unwrap();
+    let keypair_path = cli.keypair.unwrap_or(config.keypair_path);
+    is_keypair(&keypair_path).unwrap();
+
+    let client = RpcClient::new(url);
+    let payer = read_keypair_file(keypair_path).unwrap();
+    let commitment = CommitmentConfig::confirmed();
+
+    let mut instructions = vec![];
+    if cli.compute_budget != DEFAULT_INSTRUCTION_COMPUTE_UNIT_LIMIT {
+        assert!(cli.compute_budget <= MAX_COMPUTE_UNIT_LIMIT);
+        instructions.push(ComputeBudgetInstruction::set_compute_unit_limit(
+            cli.compute_budget,
+        ));
+    }
+    if let Some(heap_size) = cli.heap_size {
+        assert!(heap_size <= MAX_HEAP_FRAME_BYTES);
+        instructions.push(ComputeBudgetInstruction::request_heap_frame(heap_size));
+    }
+
+    match cli.cmd {
+        MailboxCmd::Init(init) => {
+            let (auth_account, auth_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &init.local_domain.to_le_bytes(),
+                    b"-",
+                    b"authority",
+                ],
+                &init.program_id,
+            );
+            let (inbox_account, inbox_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &init.local_domain.to_le_bytes(),
+                    b"-",
+                    b"inbox",
+                ],
+                &init.program_id,
+            );
+            let (outbox_account, outbox_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &init.local_domain.to_le_bytes(),
+                    b"-",
+                    b"outbox",
+                ],
+                &init.program_id,
+            );
+
+            let ixn = MailboxInstruction::Init(InitMailbox {
+                local_domain: init.local_domain,
+                auth_bump_seed: auth_bump,
+                inbox_bump_seed: inbox_bump,
+                outbox_bump_seed: outbox_bump,
+            });
+            let init_instruction = Instruction {
+                program_id: init.program_id,
+                data: ixn.into_instruction_data().unwrap(),
+                accounts: vec![
+                    AccountMeta::new(system_program::ID, false),
+                    AccountMeta::new(payer.pubkey(), true),
+                    AccountMeta::new(auth_account, false),
+                    AccountMeta::new(inbox_account, false),
+                    AccountMeta::new(outbox_account, false),
+                ],
+            };
+
+            let recent_blockhash = client.get_latest_blockhash().unwrap();
+            let txn = Transaction::new_signed_with_payer(
+                &[init_instruction],
+                Some(&payer.pubkey()),
+                &[&payer],
+                recent_blockhash,
+            );
+
+            let signature = client.send_transaction(&txn).unwrap();
+            client
+                .confirm_transaction_with_spinner(&signature, &recent_blockhash, commitment)
+                .unwrap();
+
+            println!("auth=({}, {})", auth_account, auth_bump);
+            println!("inbox=({}, {})", inbox_account, inbox_bump);
+            println!("outbox=({}, {})", outbox_account, outbox_bump);
+        }
+        MailboxCmd::Query(query) => {
+            let (auth_account, auth_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &query.local_domain.to_le_bytes(),
+                    b"-",
+                    b"authority",
+                ],
+                &query.program_id,
+            );
+            let (inbox_account, inbox_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &query.local_domain.to_le_bytes(),
+                    b"-",
+                    b"inbox",
+                ],
+                &query.program_id,
+            );
+            let (outbox_account, outbox_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &query.local_domain.to_le_bytes(),
+                    b"-",
+                    b"outbox",
+                ],
+                &query.program_id,
+            );
+
+            let accounts = client
+                .get_multiple_accounts(&[auth_account, inbox_account, outbox_account])
+                .unwrap();
+            println!("--------------------------------");
+            println!("Authority: {}, bump={}", auth_account, auth_bump);
+            if let Some(info) = &accounts[0] {
+                println!("{:#?}", info);
+            } else {
+                println!("Not yet created?");
+            }
+            println!("--------------------------------");
+            println!("Inbox: {}, bump={}", inbox_account, inbox_bump);
+            if let Some(info) = &accounts[1] {
+                println!("{:#?}", info);
+                match InboxAccount::fetch(&mut info.data.as_ref()) {
+                    Ok(inbox) => println!("{:#?}", inbox.into_inner()),
+                    Err(err) => println!("Failed to deserialize account data: {}", err),
+                }
+            } else {
+                println!("Not yet created?");
+            }
+            println!("--------------------------------");
+            println!("Outbox: {}, bump={}", outbox_account, outbox_bump);
+            if let Some(info) = &accounts[2] {
+                println!("{:#?}", info);
+                match OutboxAccount::fetch(&mut info.data.as_ref()) {
+                    Ok(outbox) => println!("{:#?}", outbox.into_inner()),
+                    Err(err) => println!("Failed to deserialize account data: {}", err),
+                }
+            } else {
+                println!("Not yet created?");
+            }
+        }
+        MailboxCmd::Send(outbox) => {
+            let (outbox_account, _outbox_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &outbox.local_domain.to_le_bytes(),
+                    b"-",
+                    b"outbox",
+                ],
+                &outbox.program_id,
+            );
+            let ixn = MailboxInstruction::OutboxDispatch(OutboxDispatch {
+                sender: payer.pubkey(),
+                local_domain: outbox.local_domain,
+                destination_domain: outbox.destination,
+                recipient: H256(outbox.recipient.to_bytes()),
+                message_body: std::iter::repeat(0x41).take(outbox.message_len).collect(),
+            });
+            let outbox_instruction = Instruction {
+                program_id: outbox.program_id,
+                data: ixn.into_instruction_data().unwrap(),
+                accounts: vec![AccountMeta::new(outbox_account, false)],
+            };
+            instructions.push(outbox_instruction);
+            let recent_blockhash = client.get_latest_blockhash().unwrap();
+            let txn = Transaction::new_signed_with_payer(
+                &instructions,
+                Some(&payer.pubkey()),
+                &[&payer],
+                recent_blockhash,
+            );
+
+            let signature = client.send_transaction(&txn).unwrap();
+            client
+                .confirm_transaction_with_spinner(&signature, &recent_blockhash, commitment)
+                .unwrap();
+        }
+        MailboxCmd::Receive(inbox) => {
+            let (inbox_account, _inbox_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &inbox.local_domain.to_le_bytes(),
+                    b"-",
+                    b"inbox",
+                ],
+                &inbox.program_id,
+            );
+            let (auth_account, _auth_bump) = Pubkey::find_program_address(
+                &[
+                    b"hyperlane",
+                    b"-",
+                    &inbox.local_domain.to_le_bytes(),
+                    b"-",
+                    b"authority",
+                ],
+                &inbox.program_id,
+            );
+            let hyperlane_message = HyperlaneMessage {
+                version: VERSION,
+                nonce: inbox.nonce,
+                origin: inbox.origin,
+                sender: H256::repeat_byte(123),
+                destination: u32::MAX,
+                recipient: H256::from(inbox.recipient.to_bytes()),
+                body: inbox.message.bytes().collect(),
+            };
+            let mut encoded_message = vec![];
+            hyperlane_message.write_to(&mut encoded_message).unwrap();
+            let metadata = ExampleMetadata {
+                root: Default::default(),
+                index: 1,
+                leaf_index: 0,
+                // proof: Default::default(),
+                signatures: vec![],
+            };
+            let mut encoded_metadata = vec![];
+            metadata.write_to(&mut encoded_metadata).unwrap();
+
+            let ixn = MailboxInstruction::InboxProcess(InboxProcess {
+                metadata: encoded_metadata,
+                message: encoded_message,
+            });
+            let inbox_instruction = Instruction {
+                program_id: inbox.program_id,
+                data: ixn.into_instruction_data().unwrap(),
+                accounts: vec![
+                    AccountMeta::new(inbox_account, false),
+                    AccountMeta::new_readonly(auth_account, false),
+                    AccountMeta::new_readonly(inbox.ism, false),
+                    AccountMeta::new_readonly(inbox.recipient, false),
+                    // Note: we would have to provide ism accounts and recipient accounts here if
+                    // they were to use other accounts.
+                ],
+            };
+            instructions.push(inbox_instruction);
+            let recent_blockhash = client.get_latest_blockhash().unwrap();
+            let txn = Transaction::new_signed_with_payer(
+                &instructions,
+                Some(&payer.pubkey()),
+                &[&payer],
+                recent_blockhash,
+            );
+
+            let signature = client.send_transaction(&txn).unwrap();
+            client
+                .confirm_transaction_with_spinner(&signature, &recent_blockhash, commitment)
+                .unwrap();
+        }
+    };
+}
diff --git a/rust/sealevel/hyperlane-core/Cargo.toml b/rust/sealevel/hyperlane-core/Cargo.toml
new file mode 100644
index 0000000000..70678a2c15
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+name = "hyperlane-core"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+auto_impl = "1.0"
+lazy_static = "1.4"
+# TODO Use upstream primitive_types
+primitive-types = { branch = "steven/primitive-types-impl-borsh", features = ["impl-borsh", "impl-serde"], git = "ssh://git@github.com/Eclipse-Laboratories-Inc/parity-common" }
+sha3 = "0.10.0"
+thiserror = "1.0"
+serde = { versions = "1.0", features = ["derive"] }
+strum = { version = "0.24", features = ["derive"] }
+strum_macros = "0.24"
+num-traits = "0.2"
+num-derive = "0.3"
+
+# https://github.com/solana-labs/solana/blob/master/docs/src/developing/on-chain-programs/developing-rust.md#depending-on-rand
+getrandom = { version = "0.2.2", features = ["custom"] }
+
+borsh = "0.9.3"
+bs58 = "=0.4.0"
+
+[dev-dependencies]
+serde_json = "1.0"
diff --git a/rust/sealevel/hyperlane-core/src/accumulator/incremental.rs b/rust/sealevel/hyperlane-core/src/accumulator/incremental.rs
new file mode 100644
index 0000000000..1f62d0f3df
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/accumulator/incremental.rs
@@ -0,0 +1,163 @@
+use crate::types::H256;
+use borsh::{BorshDeserialize, BorshSerialize};
+
+use crate::accumulator::{
+    hash_concat,
+    merkle::{merkle_root_from_branch, Proof},
+    TREE_DEPTH, ZERO_HASHES,
+};
+
+#[derive(BorshDeserialize, BorshSerialize, Debug, Clone, Copy)]
+/// An incremental merkle tree, modeled on the eth2 deposit contract
+pub struct IncrementalMerkle {
+    branch: [H256; TREE_DEPTH],
+    count: usize,
+}
+
+impl Default for IncrementalMerkle {
+    fn default() -> Self {
+        let mut branch: [H256; TREE_DEPTH] = Default::default();
+        branch
+            .iter_mut()
+            .enumerate()
+            .for_each(|(i, elem)| *elem = ZERO_HASHES[i]);
+        Self { branch, count: 0 }
+    }
+}
+
+impl IncrementalMerkle {
+    /// Ingest a leaf into the tree.
+    pub fn ingest(&mut self, element: H256) {
+        let mut node = element;
+        assert!(self.count < u32::MAX as usize);
+        self.count += 1;
+        let mut size = self.count;
+        for i in 0..TREE_DEPTH {
+            if (size & 1) == 1 {
+                self.branch[i] = node;
+                return;
+            }
+            node = hash_concat(self.branch[i], node);
+            size /= 2;
+        }
+    }
+
+    /// Calculate the current tree root
+    pub fn root(&self) -> H256 {
+        let mut node: H256 = Default::default();
+        let mut size = self.count;
+
+        self.branch.iter().enumerate().for_each(|(i, elem)| {
+            node = if (size & 1) == 1 {
+                hash_concat(elem, node)
+            } else {
+                hash_concat(node, ZERO_HASHES[i])
+            };
+            size /= 2;
+        });
+
+        node
+    }
+
+    /// Get the number of items in the tree
+    pub fn count(&self) -> usize {
+        self.count
+    }
+
+    /// Get the leading-edge branch.
+    pub fn branch(&self) -> &[H256; TREE_DEPTH] {
+        &self.branch
+    }
+
+    /// Calculate the root of a branch for incremental given the index
+    pub fn branch_root(item: H256, branch: [H256; TREE_DEPTH], index: usize) -> H256 {
+        merkle_root_from_branch(item, &branch, 32, index)
+    }
+
+    /// Verify a incremental merkle proof of inclusion
+    pub fn verify(&self, proof: &Proof) -> bool {
+        let computed = IncrementalMerkle::branch_root(proof.leaf, proof.path, proof.index as usize);
+        computed == self.root()
+    }
+}
+
+#[cfg(all(test))]
+mod test {
+    use super::*;
+
+    use std::{fs::File, io::Read, path::PathBuf};
+
+    use sha3::{digest::Update, Digest, Keccak256};
+
+    // From ethers-rs
+    fn hash_message<S>(message: S) -> H256
+    where
+        S: AsRef<[u8]>,
+    {
+        const PREFIX: &str = "\x19Ethereum Signed Message:\n";
+        let message = message.as_ref();
+
+        let mut eth_message = format!("{}{}", PREFIX, message.len()).into_bytes();
+        eth_message.extend_from_slice(message);
+
+        H256::from_slice(Keccak256::new().chain(eth_message).finalize().as_slice())
+    }
+
+    // From test_utils.rs
+    fn find_vector(final_component: &str) -> PathBuf {
+        let cwd = std::env::current_dir().expect("no cwd?");
+        let git_dir = cwd
+            .ancestors() // . ; ../ ; ../../ ; ...
+            .find(|d| d.join(".git").is_dir())
+            .expect("could not find .git somewhere! confused about workspace layout");
+
+        git_dir.join("vectors").join(final_component)
+    }
+
+    #[derive(serde::Deserialize, serde::Serialize)]
+    #[serde(rename_all = "camelCase")]
+    struct MerkleTestCase {
+        /// Test case name
+        pub test_name: String,
+        /// Leaves of merkle tree
+        pub leaves: Vec<String>,
+        /// Proofs for leaves in tree
+        pub proofs: Vec<Proof>,
+        /// Root of tree
+        pub expected_root: H256,
+    }
+
+    fn load_merkle_test_json() -> Vec<MerkleTestCase> {
+        let mut file = File::open(find_vector("merkle.json")).unwrap();
+        let mut data = String::new();
+        file.read_to_string(&mut data).unwrap();
+        serde_json::from_str(&data).unwrap()
+    }
+
+    #[test]
+    fn it_computes_branch_roots() {
+        let test_cases = load_merkle_test_json();
+
+        for test_case in test_cases.iter() {
+            let mut tree = IncrementalMerkle::default();
+
+            // insert the leaves
+            for leaf in test_case.leaves.iter() {
+                let hashed_leaf = hash_message(leaf);
+                tree.ingest(hashed_leaf);
+            }
+
+            // assert the tree has the proper leaf count
+            assert_eq!(tree.count(), test_case.leaves.len());
+
+            // assert the tree generates the proper root
+            let root = tree.root(); // root is type H256
+            assert_eq!(root, test_case.expected_root);
+
+            for n in 0..test_case.leaves.len() {
+                // check that the tree can verify the proof for this leaf
+                assert!(tree.verify(&test_case.proofs[n]));
+            }
+        }
+    }
+}
diff --git a/rust/sealevel/hyperlane-core/src/accumulator/merkle.rs b/rust/sealevel/hyperlane-core/src/accumulator/merkle.rs
new file mode 100644
index 0000000000..2fc795065d
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/accumulator/merkle.rs
@@ -0,0 +1,696 @@
+use crate::types::H256;
+use lazy_static::lazy_static;
+use thiserror::Error;
+
+use crate::{
+    accumulator::{hash_concat, EMPTY_SLICE, TREE_DEPTH, ZERO_HASHES},
+    Decode, Encode,
+};
+
+// Some code has been derived from
+// https://github.com/sigp/lighthouse/blob/c6baa0eed131c5e8ecc5860778ffc7d4a4c18d2d/consensus/merkle_proof/src/lib.rs#L25
+// It has been modified as follows:
+//    - improve legibility
+//    - remove eth2-specific features.
+//    - use keccak256
+//    - remove ring dependency
+// In accordance with its license terms, the apache2 license is reproduced below
+
+lazy_static! {
+    /// Zero nodes to act as "synthetic" left and right subtrees of other zero nodes.
+    pub static ref ZERO_NODES: Vec<MerkleTree> = {
+        (0..=TREE_DEPTH).map(MerkleTree::Zero).collect()
+    };
+}
+
+/// Right-sparse Merkle tree.
+///
+/// Efficiently represents a Merkle tree of fixed depth where only the first N
+/// indices are populated by non-zero leaves (perfect for the deposit contract tree).
+#[derive(Debug, PartialEq)]
+pub enum MerkleTree {
+    /// Leaf node with the hash of its content.
+    Leaf(H256),
+    /// Internal node with hash, left subtree and right subtree.
+    Node(H256, Box<Self>, Box<Self>),
+    /// Zero subtree of a given depth.
+    ///
+    /// It represents a Merkle tree of 2^depth zero leaves.
+    Zero(usize),
+}
+
+/// A merkle proof object. The leaf, its path to the root, and its index in the
+/// tree.
+#[derive(Debug, Clone, Copy, serde::Deserialize, serde::Serialize, PartialEq, Eq)]
+pub struct Proof {
+    /// The leaf
+    pub leaf: H256,
+    /// The index
+    pub index: usize,
+    /// The merkle branch
+    pub path: [H256; TREE_DEPTH],
+}
+
+impl Proof {
+    /// Calculate the merkle root produced by evaluating the proof
+    pub fn root(&self) -> H256 {
+        merkle_root_from_branch(self.leaf, self.path.as_ref(), TREE_DEPTH, self.index)
+    }
+}
+
+impl Encode for Proof {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(self.leaf.as_bytes())?;
+        writer.write_all(&self.index.to_be_bytes())?;
+        for hash in self.path.iter() {
+            writer.write_all(hash.as_bytes())?;
+        }
+        Ok(32 + 8 + TREE_DEPTH * 32)
+    }
+}
+
+impl Decode for Proof {
+    fn read_from<R>(reader: &mut R) -> Result<Self, crate::HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized,
+    {
+        let mut leaf = H256::default();
+        let mut index_bytes = [0u8; 8];
+        let mut path = [H256::default(); 32];
+
+        reader.read_exact(leaf.as_bytes_mut())?;
+        reader.read_exact(&mut index_bytes)?;
+        for item in &mut path {
+            reader.read_exact(item.as_bytes_mut())?;
+        }
+
+        let index = u64::from_be_bytes(index_bytes) as usize;
+
+        Ok(Self { leaf, index, path })
+    }
+}
+
+/// Error type for merkle tree ops.
+#[derive(Debug, PartialEq, Eq, Clone, Error)]
+pub enum MerkleTreeError {
+    /// Trying to push in a leaf
+    #[error("Trying to push in a leaf")]
+    LeafReached,
+    /// No more space in the MerkleTree
+    #[error("No more space in the MerkleTree")]
+    MerkleTreeFull,
+    /// MerkleTree is invalid
+    #[error("MerkleTree is invalid")]
+    Invalid,
+    /// Incorrect Depth provided
+    #[error("Incorrect Depth provided")]
+    DepthTooSmall,
+}
+
+impl MerkleTree {
+    /// Retrieve the root hash of this Merkle tree.
+    pub fn hash(&self) -> H256 {
+        match *self {
+            MerkleTree::Leaf(h) => h,
+            MerkleTree::Node(h, _, _) => h,
+            MerkleTree::Zero(depth) => ZERO_HASHES[depth],
+        }
+    }
+
+    /// Create a new Merkle tree from a list of leaves and a fixed depth.
+    pub fn create(leaves: &[H256], depth: usize) -> Self {
+        use MerkleTree::*;
+
+        if leaves.is_empty() {
+            return Zero(depth);
+        }
+
+        match depth {
+            0 => {
+                debug_assert_eq!(leaves.len(), 1);
+                Leaf(leaves[0])
+            }
+            _ => {
+                // Split leaves into left and right subtrees
+                let subtree_capacity = 2usize.pow(depth as u32 - 1);
+                let (left_leaves, right_leaves) = if leaves.len() <= subtree_capacity {
+                    (leaves, EMPTY_SLICE)
+                } else {
+                    leaves.split_at(subtree_capacity)
+                };
+
+                let left_subtree = MerkleTree::create(left_leaves, depth - 1);
+                let right_subtree = MerkleTree::create(right_leaves, depth - 1);
+                let hash = hash_concat(left_subtree.hash(), right_subtree.hash());
+
+                Node(hash, Box::new(left_subtree), Box::new(right_subtree))
+            }
+        }
+    }
+
+    /// Push an element in the MerkleTree.
+    /// MerkleTree and depth must be correct, as the algorithm expects valid data.
+    pub fn push_leaf(&mut self, elem: H256, depth: usize) -> Result<(), MerkleTreeError> {
+        use MerkleTree::*;
+
+        if depth == 0 {
+            return Err(MerkleTreeError::DepthTooSmall);
+        }
+
+        match self {
+            Leaf(_) => return Err(MerkleTreeError::LeafReached),
+            Zero(_) => {
+                *self = MerkleTree::create(&[elem], depth);
+            }
+            Node(ref mut hash, ref mut left, ref mut right) => {
+                let left: &mut MerkleTree = &mut *left;
+                let right: &mut MerkleTree = &mut *right;
+                match (&*left, &*right) {
+                    // Tree is full
+                    (Leaf(_), Leaf(_)) => return Err(MerkleTreeError::MerkleTreeFull),
+                    // There is a right node so insert in right node
+                    (Node(_, _, _), Node(_, _, _)) => right.push_leaf(elem, depth - 1)?,
+                    // Both branches are zero, insert in left one
+                    (Zero(_), Zero(_)) => {
+                        *left = MerkleTree::create(&[elem], depth - 1);
+                    }
+                    // Leaf on left branch and zero on right branch, insert on right side
+                    (Leaf(_), Zero(_)) => {
+                        *right = MerkleTree::create(&[elem], depth - 1);
+                    }
+                    // Try inserting on the left node -> if it fails because it is full, insert in right side.
+                    (Node(_, _, _), Zero(_)) => {
+                        match left.push_leaf(elem, depth - 1) {
+                            Ok(_) => (),
+                            // Left node is full, insert in right node
+                            Err(MerkleTreeError::MerkleTreeFull) => {
+                                *right = MerkleTree::create(&[elem], depth - 1);
+                            }
+                            Err(e) => return Err(e),
+                        };
+                    }
+                    // All other possibilities are invalid MerkleTrees
+                    (_, _) => return Err(MerkleTreeError::Invalid),
+                };
+                hash.assign_from_slice(hash_concat(left.hash(), right.hash()).as_ref());
+            }
+        }
+
+        Ok(())
+    }
+    /// Get a reference to the left and right subtrees if they exist.
+    pub fn left_and_right_branches(&self) -> Option<(&Self, &Self)> {
+        match *self {
+            MerkleTree::Leaf(_) | MerkleTree::Zero(0) => None,
+            MerkleTree::Node(_, ref l, ref r) => Some((l, r)),
+            MerkleTree::Zero(depth) => Some((&ZERO_NODES[depth - 1], &ZERO_NODES[depth - 1])),
+        }
+    }
+
+    /// Is this Merkle tree a leaf?
+    pub fn is_leaf(&self) -> bool {
+        matches!(self, MerkleTree::Leaf(_))
+    }
+
+    /// Return the leaf at `index` and a Merkle proof of its inclusion.
+    ///
+    /// The Merkle proof is in "bottom-up" order, starting with a leaf node
+    /// and moving up the tree. Its length will be exactly equal to `depth`.
+    pub fn generate_proof(&self, index: usize, depth: usize) -> (H256, Vec<H256>) {
+        let mut proof = vec![];
+        let mut current_node = self;
+        let mut current_depth = depth;
+        while current_depth > 0 {
+            let ith_bit = (index >> (current_depth - 1)) & 0x01;
+            // Note: unwrap is safe because leaves are only ever constructed at depth == 0.
+            let (left, right) = current_node.left_and_right_branches().unwrap();
+
+            // Go right, include the left branch in the proof.
+            if ith_bit == 1 {
+                proof.push(left.hash());
+                current_node = right;
+            } else {
+                proof.push(right.hash());
+                current_node = left;
+            }
+            current_depth -= 1;
+        }
+
+        debug_assert_eq!(proof.len(), depth);
+        debug_assert!(current_node.is_leaf());
+
+        // Put proof in bottom-up order.
+        proof.reverse();
+
+        (current_node.hash(), proof)
+    }
+}
+
+/// Verify a proof that `leaf` exists at `index` in a Merkle tree rooted at `root`.
+///
+/// The `branch` argument is the main component of the proof: it should be a list of internal
+/// node hashes such that the root can be reconstructed (in bottom-up order).
+pub fn verify_merkle_proof(
+    leaf: H256,
+    branch: &[H256],
+    depth: usize,
+    index: usize,
+    root: H256,
+) -> bool {
+    if branch.len() == depth {
+        merkle_root_from_branch(leaf, branch, depth, index) == root
+    } else {
+        false
+    }
+}
+
+/// Compute a root hash from a leaf and a Merkle proof.
+pub fn merkle_root_from_branch(leaf: H256, branch: &[H256], depth: usize, index: usize) -> H256 {
+    assert_eq!(branch.len(), depth, "proof length should equal depth");
+
+    let mut current = leaf;
+
+    for (i, next) in branch.iter().enumerate().take(depth) {
+        let ith_bit = (index >> i) & 0x01;
+        if ith_bit == 1 {
+            current = hash_concat(next, current);
+        } else {
+            current = hash_concat(current, next);
+        }
+    }
+
+    current
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::accumulator::incremental;
+
+    use super::*;
+
+    #[test]
+    fn sparse_zero_correct() {
+        let depth = 2;
+        let zero = H256::from([0x00; 32]);
+        let dense_tree = MerkleTree::create(&[zero, zero, zero, zero], depth);
+        let sparse_tree = MerkleTree::create(&[], depth);
+        assert_eq!(dense_tree.hash(), sparse_tree.hash());
+    }
+
+    #[test]
+    fn create_small_example() {
+        // Construct a small merkle tree manually and check that it's consistent with
+        // the MerkleTree type.
+        let leaf_b00 = H256::from([0xAA; 32]);
+        let leaf_b01 = H256::from([0xBB; 32]);
+        let leaf_b10 = H256::from([0xCC; 32]);
+        let leaf_b11 = H256::from([0xDD; 32]);
+
+        let node_b0x = hash_concat(leaf_b00, leaf_b01);
+        let node_b1x = hash_concat(leaf_b10, leaf_b11);
+
+        let root = hash_concat(node_b0x, node_b1x);
+
+        let tree = MerkleTree::create(&[leaf_b00, leaf_b01, leaf_b10, leaf_b11], 2);
+        assert_eq!(tree.hash(), root);
+    }
+
+    #[test]
+    fn verify_small_example() {
+        // Construct a small merkle tree manually
+        let leaf_b00 = H256::from([0xAA; 32]);
+        let leaf_b01 = H256::from([0xBB; 32]);
+        let leaf_b10 = H256::from([0xCC; 32]);
+        let leaf_b11 = H256::from([0xDD; 32]);
+
+        let node_b0x = hash_concat(leaf_b00, leaf_b01);
+        let node_b1x = hash_concat(leaf_b10, leaf_b11);
+
+        let root = hash_concat(node_b0x, node_b1x);
+
+        // Run some proofs
+        assert!(verify_merkle_proof(
+            leaf_b00,
+            &[leaf_b01, node_b1x],
+            2,
+            0b00,
+            root
+        ));
+        assert!(verify_merkle_proof(
+            leaf_b01,
+            &[leaf_b00, node_b1x],
+            2,
+            0b01,
+            root
+        ));
+        assert!(verify_merkle_proof(
+            leaf_b10,
+            &[leaf_b11, node_b0x],
+            2,
+            0b10,
+            root
+        ));
+        assert!(verify_merkle_proof(
+            leaf_b11,
+            &[leaf_b10, node_b0x],
+            2,
+            0b11,
+            root
+        ));
+        assert!(verify_merkle_proof(
+            leaf_b11,
+            &[leaf_b10],
+            1,
+            0b11,
+            node_b1x
+        ));
+
+        // Ensure that incorrect proofs fail
+        // Zero-length proof
+        assert!(!verify_merkle_proof(leaf_b01, &[], 2, 0b01, root));
+        // Proof in reverse order
+        assert!(!verify_merkle_proof(
+            leaf_b01,
+            &[node_b1x, leaf_b00],
+            2,
+            0b01,
+            root
+        ));
+        // Proof too short
+        assert!(!verify_merkle_proof(leaf_b01, &[leaf_b00], 2, 0b01, root));
+        // Wrong index
+        assert!(!verify_merkle_proof(
+            leaf_b01,
+            &[leaf_b00, node_b1x],
+            2,
+            0b10,
+            root
+        ));
+        // Wrong root
+        assert!(!verify_merkle_proof(
+            leaf_b01,
+            &[leaf_b00, node_b1x],
+            2,
+            0b01,
+            node_b1x
+        ));
+    }
+
+    #[test]
+    fn verify_zero_depth() {
+        let leaf = H256::from([0xD6; 32]);
+        let junk = H256::from([0xD7; 32]);
+        assert!(verify_merkle_proof(leaf, &[], 0, 0, leaf));
+        assert!(!verify_merkle_proof(leaf, &[], 0, 7, junk));
+    }
+
+    #[test]
+    fn push_complete_example() {
+        let depth = 2;
+        let mut tree = MerkleTree::create(&[], depth);
+
+        let leaf_b00 = H256::from([0xAA; 32]);
+
+        let res = tree.push_leaf(leaf_b00, 0);
+        assert_eq!(res, Err(MerkleTreeError::DepthTooSmall));
+        let expected_tree = MerkleTree::create(&[], depth);
+        assert_eq!(tree.hash(), expected_tree.hash());
+
+        tree.push_leaf(leaf_b00, depth)
+            .expect("Pushing in empty tree failed");
+        let expected_tree = MerkleTree::create(&[leaf_b00], depth);
+        assert_eq!(tree.hash(), expected_tree.hash());
+
+        let leaf_b01 = H256::from([0xBB; 32]);
+        tree.push_leaf(leaf_b01, depth)
+            .expect("Pushing in left then right node failed");
+        let expected_tree = MerkleTree::create(&[leaf_b00, leaf_b01], depth);
+        assert_eq!(tree.hash(), expected_tree.hash());
+
+        let leaf_b10 = H256::from([0xCC; 32]);
+        tree.push_leaf(leaf_b10, depth)
+            .expect("Pushing in right then left node failed");
+        let expected_tree = MerkleTree::create(&[leaf_b00, leaf_b01, leaf_b10], depth);
+        assert_eq!(tree.hash(), expected_tree.hash());
+
+        let leaf_b11 = H256::from([0xDD; 32]);
+        tree.push_leaf(leaf_b11, depth)
+            .expect("Pushing in outtermost leaf failed");
+        let expected_tree = MerkleTree::create(&[leaf_b00, leaf_b01, leaf_b10, leaf_b11], depth);
+        assert_eq!(tree.hash(), expected_tree.hash());
+
+        let leaf_b12 = H256::from([0xEE; 32]);
+        let res = tree.push_leaf(leaf_b12, depth);
+        assert_eq!(res, Err(MerkleTreeError::MerkleTreeFull));
+        assert_eq!(tree.hash(), expected_tree.hash());
+    }
+
+    #[test]
+    fn big_test() {
+        let leaves: Vec<_> = (0..64).map(H256::from_low_u64_be).collect();
+
+        let mut tree = MerkleTree::create(&[], 32);
+        leaves.iter().for_each(|leaf| {
+            tree.push_leaf(*leaf, 32).unwrap();
+        });
+
+        leaves.iter().enumerate().for_each(|(i, leaf)| {
+            let (l, proof) = tree.generate_proof(i, 32);
+            assert_eq!(l, *leaf);
+            assert!(verify_merkle_proof(*leaf, &proof, 32, i, tree.hash()));
+        });
+    }
+
+    #[test]
+    fn it_correctly_calculate_zeroes() {
+        ZERO_HASHES
+            .iter()
+            .zip(ZERO_NODES.iter())
+            .take(TREE_DEPTH)
+            .for_each(|(left, right)| {
+                assert_eq!(*left, right.hash());
+            });
+    }
+
+    #[test]
+    fn it_is_compatible_with_incremental_merkle() {
+        let leaf = H256::repeat_byte(1);
+
+        let mut full = MerkleTree::create(&[], TREE_DEPTH);
+        let mut incr = incremental::IncrementalMerkle::default();
+        let second = MerkleTree::create(&[leaf], TREE_DEPTH);
+
+        full.push_leaf(leaf, TREE_DEPTH).unwrap();
+        incr.ingest(leaf);
+        assert_eq!(second.hash(), incr.root());
+        assert_eq!(full.hash(), incr.root());
+    }
+}
+
+/*
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+
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diff --git a/rust/sealevel/hyperlane-core/src/accumulator/mod.rs b/rust/sealevel/hyperlane-core/src/accumulator/mod.rs
new file mode 100644
index 0000000000..7973e18f10
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/accumulator/mod.rs
@@ -0,0 +1,177 @@
+/// A lightweight incremental merkle, suitable for running on-chain. Stores O
+/// (1) data
+pub mod incremental;
+/// A full incremental merkle. Suitable for running off-chain.
+pub mod merkle;
+
+use crate::types::H256;
+use sha3::digest::Update;
+use sha3::{Digest, Keccak256};
+
+/// Tree depth
+pub const TREE_DEPTH: usize = 32;
+const EMPTY_SLICE: &[H256] = &[];
+
+pub(super) fn hash_concat(left: impl AsRef<[u8]>, right: impl AsRef<[u8]>) -> H256 {
+    H256::from_slice(
+        Keccak256::new()
+            .chain(left.as_ref())
+            .chain(right.as_ref())
+            .finalize()
+            .as_slice(),
+    )
+}
+
+// Can't have writable static data in solana bpf so must pre-compute the table.
+pub static ZERO_HASHES: [H256; TREE_DEPTH + 1] = [
+    H256([
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0,
+    ]),
+    H256([
+        173, 50, 40, 182, 118, 247, 211, 205, 66, 132, 165, 68, 63, 23, 241, 150, 43, 54, 228, 145,
+        179, 10, 64, 178, 64, 88, 73, 229, 151, 186, 95, 181,
+    ]),
+    H256([
+        180, 193, 25, 81, 149, 124, 111, 143, 100, 44, 74, 246, 28, 214, 178, 70, 64, 254, 198,
+        220, 127, 198, 7, 238, 130, 6, 169, 158, 146, 65, 13, 48,
+    ]),
+    H256([
+        33, 221, 185, 163, 86, 129, 92, 63, 172, 16, 38, 182, 222, 197, 223, 49, 36, 175, 186, 219,
+        72, 92, 155, 165, 163, 227, 57, 138, 4, 183, 186, 133,
+    ]),
+    H256([
+        229, 135, 105, 179, 42, 27, 234, 241, 234, 39, 55, 90, 68, 9, 90, 13, 31, 182, 100, 206,
+        45, 211, 88, 231, 252, 191, 183, 140, 38, 161, 147, 68,
+    ]),
+    H256([
+        14, 176, 30, 191, 201, 237, 39, 80, 12, 212, 223, 201, 121, 39, 45, 31, 9, 19, 204, 159,
+        102, 84, 13, 126, 128, 5, 129, 17, 9, 225, 207, 45,
+    ]),
+    H256([
+        136, 124, 34, 189, 135, 80, 211, 64, 22, 172, 60, 102, 181, 255, 16, 45, 172, 221, 115,
+        246, 176, 20, 231, 16, 181, 30, 128, 34, 175, 154, 25, 104,
+    ]),
+    H256([
+        255, 215, 1, 87, 228, 128, 99, 252, 51, 201, 122, 5, 15, 127, 100, 2, 51, 191, 100, 108,
+        201, 141, 149, 36, 198, 185, 43, 207, 58, 181, 111, 131,
+    ]),
+    H256([
+        152, 103, 204, 95, 127, 25, 107, 147, 186, 225, 226, 126, 99, 32, 116, 36, 69, 210, 144,
+        242, 38, 56, 39, 73, 139, 84, 254, 197, 57, 247, 86, 175,
+    ]),
+    H256([
+        206, 250, 212, 229, 8, 192, 152, 185, 167, 225, 216, 254, 177, 153, 85, 251, 2, 186, 150,
+        117, 88, 80, 120, 113, 9, 105, 211, 68, 15, 80, 84, 224,
+    ]),
+    H256([
+        249, 220, 62, 127, 224, 22, 224, 80, 239, 242, 96, 51, 79, 24, 165, 212, 254, 57, 29, 130,
+        9, 35, 25, 245, 150, 79, 46, 46, 183, 193, 195, 165,
+    ]),
+    H256([
+        248, 177, 58, 73, 226, 130, 246, 9, 195, 23, 168, 51, 251, 141, 151, 109, 17, 81, 124, 87,
+        29, 18, 33, 162, 101, 210, 90, 247, 120, 236, 248, 146,
+    ]),
+    H256([
+        52, 144, 198, 206, 235, 69, 10, 236, 220, 130, 226, 130, 147, 3, 29, 16, 199, 215, 59, 248,
+        94, 87, 191, 4, 26, 151, 54, 10, 162, 197, 217, 156,
+    ]),
+    H256([
+        193, 223, 130, 217, 196, 184, 116, 19, 234, 226, 239, 4, 143, 148, 180, 211, 85, 76, 234,
+        115, 217, 43, 15, 122, 249, 110, 2, 113, 198, 145, 226, 187,
+    ]),
+    H256([
+        92, 103, 173, 215, 198, 202, 243, 2, 37, 106, 222, 223, 122, 177, 20, 218, 10, 207, 232,
+        112, 212, 73, 163, 164, 137, 247, 129, 214, 89, 232, 190, 204,
+    ]),
+    H256([
+        218, 123, 206, 159, 78, 134, 24, 182, 189, 47, 65, 50, 206, 121, 140, 220, 122, 96, 231,
+        225, 70, 10, 114, 153, 227, 198, 52, 42, 87, 150, 38, 210,
+    ]),
+    H256([
+        39, 51, 229, 15, 82, 110, 194, 250, 25, 162, 43, 49, 232, 237, 80, 242, 60, 209, 253, 249,
+        76, 145, 84, 237, 58, 118, 9, 162, 241, 255, 152, 31,
+    ]),
+    H256([
+        225, 211, 181, 200, 7, 178, 129, 228, 104, 60, 198, 214, 49, 92, 249, 91, 154, 222, 134,
+        65, 222, 252, 179, 35, 114, 241, 193, 38, 227, 152, 239, 122,
+    ]),
+    H256([
+        90, 45, 206, 10, 138, 127, 104, 187, 116, 86, 15, 143, 113, 131, 124, 44, 46, 187, 203,
+        247, 255, 251, 66, 174, 24, 150, 241, 63, 124, 116, 121, 160,
+    ]),
+    H256([
+        180, 106, 40, 182, 245, 85, 64, 248, 148, 68, 246, 61, 224, 55, 142, 61, 18, 27, 224, 158,
+        6, 204, 157, 237, 28, 32, 230, 88, 118, 211, 106, 160,
+    ]),
+    H256([
+        198, 94, 150, 69, 100, 71, 134, 182, 32, 226, 221, 42, 214, 72, 221, 252, 191, 74, 126, 91,
+        26, 58, 78, 207, 231, 246, 70, 103, 163, 240, 183, 226,
+    ]),
+    H256([
+        244, 65, 133, 136, 237, 53, 162, 69, 140, 255, 235, 57, 185, 61, 38, 241, 141, 42, 177, 59,
+        220, 230, 174, 229, 142, 123, 153, 53, 158, 194, 223, 217,
+    ]),
+    H256([
+        90, 156, 22, 220, 0, 214, 239, 24, 183, 147, 58, 111, 141, 198, 92, 203, 85, 102, 113, 56,
+        119, 111, 125, 234, 16, 16, 112, 220, 135, 150, 227, 119,
+    ]),
+    H256([
+        77, 248, 79, 64, 174, 12, 130, 41, 208, 214, 6, 158, 92, 143, 57, 167, 194, 153, 103, 122,
+        9, 211, 103, 252, 123, 5, 227, 188, 56, 14, 230, 82,
+    ]),
+    H256([
+        205, 199, 37, 149, 247, 76, 123, 16, 67, 208, 225, 255, 186, 183, 52, 100, 140, 131, 141,
+        251, 5, 39, 217, 113, 182, 2, 188, 33, 108, 150, 25, 239,
+    ]),
+    H256([
+        10, 191, 90, 201, 116, 161, 237, 87, 244, 5, 10, 165, 16, 221, 156, 116, 245, 8, 39, 123,
+        57, 215, 151, 59, 178, 223, 204, 197, 238, 176, 97, 141,
+    ]),
+    H256([
+        184, 205, 116, 4, 111, 243, 55, 240, 167, 191, 44, 142, 3, 225, 15, 100, 44, 24, 134, 121,
+        141, 113, 128, 106, 177, 232, 136, 217, 229, 238, 135, 208,
+    ]),
+    H256([
+        131, 140, 86, 85, 203, 33, 198, 203, 131, 49, 59, 90, 99, 17, 117, 223, 244, 150, 55, 114,
+        204, 233, 16, 129, 136, 179, 74, 200, 124, 129, 196, 30,
+    ]),
+    H256([
+        102, 46, 228, 221, 45, 215, 178, 188, 112, 121, 97, 177, 230, 70, 196, 4, 118, 105, 220,
+        182, 88, 79, 13, 141, 119, 13, 175, 93, 126, 125, 235, 46,
+    ]),
+    H256([
+        56, 138, 178, 14, 37, 115, 209, 113, 168, 129, 8, 231, 157, 130, 14, 152, 242, 108, 11,
+        132, 170, 139, 47, 74, 164, 150, 141, 187, 129, 142, 163, 34,
+    ]),
+    H256([
+        147, 35, 124, 80, 186, 117, 238, 72, 95, 76, 34, 173, 242, 247, 65, 64, 11, 223, 141, 106,
+        156, 199, 223, 126, 202, 229, 118, 34, 22, 101, 215, 53,
+    ]),
+    H256([
+        132, 72, 129, 139, 180, 174, 69, 98, 132, 158, 148, 158, 23, 172, 22, 224, 190, 22, 104,
+        142, 21, 107, 92, 241, 94, 9, 140, 98, 124, 0, 86, 169,
+    ]),
+    H256([
+        39, 174, 91, 160, 141, 114, 145, 201, 108, 140, 189, 220, 193, 72, 191, 72, 166, 214, 140,
+        121, 116, 185, 67, 86, 245, 55, 84, 239, 97, 113, 215, 87,
+    ]),
+];
+pub static INITIAL_ROOT: H256 = H256([
+    39, 174, 91, 160, 141, 114, 145, 201, 108, 140, 189, 220, 193, 72, 191, 72, 166, 214, 140, 121,
+    116, 185, 67, 86, 245, 55, 84, 239, 97, 113, 215, 87,
+]);
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    #[test]
+    fn it_calculates_the_initial_root() {
+        assert_eq!(
+            INITIAL_ROOT,
+            "0x27ae5ba08d7291c96c8cbddcc148bf48a6d68c7974b94356f53754ef6171d757"
+                .parse()
+                .unwrap()
+        );
+    }
+}
diff --git a/rust/sealevel/hyperlane-core/src/lib.rs b/rust/sealevel/hyperlane-core/src/lib.rs
new file mode 100644
index 0000000000..0221f1878d
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/lib.rs
@@ -0,0 +1,29 @@
+//! This crate contains core primitives, traits, and types for Abacus
+//! implementations.
+
+// #![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+#![forbid(unsafe_code)]
+#![forbid(where_clauses_object_safety)]
+
+/// Accumulator management
+pub mod accumulator;
+
+/// Async Traits for Outboxes & Inboxes for use in applications
+pub mod traits;
+pub use traits::*;
+
+/// Core hyperlane system data structures
+pub mod types;
+pub use types::*;
+
+/// Error types for Hyperlane
+#[derive(Debug, thiserror::Error)]
+pub enum HyperlaneError {
+    // /// Signature Error pasthrough
+    // #[error(transparent)]
+    // SignatureError(#[from] SignatureError),
+    /// IO error from Read/Write usage
+    #[error(transparent)]
+    IoError(#[from] std::io::Error),
+}
diff --git a/rust/sealevel/hyperlane-core/src/traits/encode.rs b/rust/sealevel/hyperlane-core/src/traits/encode.rs
new file mode 100644
index 0000000000..dc847b64ec
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/traits/encode.rs
@@ -0,0 +1,148 @@
+use std::io::{Error, ErrorKind};
+
+use crate::types::{H256, U256};
+
+use crate::HyperlaneError;
+
+/// Simple trait for types with a canonical encoding
+pub trait Encode {
+    /// Write the canonical encoding to the writer
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write;
+
+    /// Serialize to a vec
+    fn to_vec(&self) -> Vec<u8> {
+        let mut buf = vec![];
+        self.write_to(&mut buf).expect("!alloc");
+        buf
+    }
+}
+
+/// Simple trait for types with a canonical encoding
+pub trait Decode {
+    /// Try to read from some source
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized;
+}
+
+impl Encode for H256 {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(self.as_ref())?;
+        Ok(32)
+    }
+}
+
+impl Decode for H256 {
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized,
+    {
+        let mut digest = H256::default();
+        reader.read_exact(digest.as_mut())?;
+        Ok(digest)
+    }
+}
+
+impl Encode for U256 {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        let mut buf = [0; 32];
+        self.to_little_endian(&mut buf);
+        writer.write_all(&buf)?;
+        Ok(32)
+    }
+}
+
+impl Decode for U256 {
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized,
+    {
+        let mut buf = [0; 32];
+        reader.read_exact(&mut buf)?;
+        Ok(U256::from_little_endian(&buf))
+    }
+}
+
+impl Encode for u32 {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(&self.to_be_bytes())?;
+        Ok(4)
+    }
+}
+
+impl Decode for u32 {
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized,
+    {
+        let mut buf = [0; 4];
+        reader.read_exact(&mut buf)?;
+        Ok(u32::from_be_bytes(buf))
+    }
+}
+
+impl Encode for u64 {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(&self.to_be_bytes())?;
+        Ok(8)
+    }
+}
+
+impl Decode for u64 {
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized,
+    {
+        let mut buf = [0; 8];
+        reader.read_exact(&mut buf)?;
+        Ok(u64::from_be_bytes(buf))
+    }
+}
+
+impl Encode for bool {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(&[u8::from(*self)])?;
+        Ok(1)
+    }
+}
+
+impl Decode for bool {
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+        Self: Sized,
+    {
+        let mut buf = [0; 1];
+        reader.read_exact(&mut buf)?;
+        match buf[0] {
+            0 => Ok(false),
+            1 => Ok(true),
+            _ => Err(HyperlaneError::IoError(Error::new(
+                ErrorKind::InvalidData,
+                "decoded bool invalid",
+            ))),
+        }
+    }
+}
diff --git a/rust/sealevel/hyperlane-core/src/traits/mod.rs b/rust/sealevel/hyperlane-core/src/traits/mod.rs
new file mode 100644
index 0000000000..3021ed7938
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/traits/mod.rs
@@ -0,0 +1,2 @@
+mod encode;
+pub use encode::*;
diff --git a/rust/sealevel/hyperlane-core/src/types/message.rs b/rust/sealevel/hyperlane-core/src/types/message.rs
new file mode 100644
index 0000000000..005f8038cb
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/types/message.rs
@@ -0,0 +1,147 @@
+use crate::types::H256;
+use sha3::digest::Update;
+use sha3::{Digest, Keccak256};
+
+use crate::{Decode, Encode, HyperlaneError};
+
+const HYPERLANE_MESSAGE_PREFIX_LEN: usize = 77;
+
+/// A Stamped message that has been committed at some nonce
+pub type RawHyperlaneMessage = Vec<u8>;
+
+impl From<&HyperlaneMessage> for RawHyperlaneMessage {
+    fn from(m: &HyperlaneMessage) -> Self {
+        let mut message_vec = vec![];
+        m.write_to(&mut message_vec).expect("!write_to");
+        message_vec
+    }
+}
+
+/// A full Hyperlane message between chains
+#[derive(Debug, Default, Clone)]
+pub struct HyperlaneMessage {
+    /// 1   Hyperlane version number
+    pub version: u8,
+    /// 4   Message nonce
+    pub nonce: u32,
+    /// 4   Origin domain ID
+    pub origin: u32,
+    /// 32  Address in origin convention
+    pub sender: H256,
+    /// 4   Destination domain ID
+    pub destination: u32,
+    /// 32  Address in destination convention
+    pub recipient: H256,
+    /// 0+  Message contents
+    pub body: Vec<u8>,
+}
+
+impl From<RawHyperlaneMessage> for HyperlaneMessage {
+    fn from(m: RawHyperlaneMessage) -> Self {
+        HyperlaneMessage::from(&m)
+    }
+}
+
+impl From<&RawHyperlaneMessage> for HyperlaneMessage {
+    fn from(m: &RawHyperlaneMessage) -> Self {
+        let version = m[0];
+        let nonce: [u8; 4] = m[1..5].try_into().unwrap();
+        let origin: [u8; 4] = m[5..9].try_into().unwrap();
+        let sender: [u8; 32] = m[9..41].try_into().unwrap();
+        let destination: [u8; 4] = m[41..45].try_into().unwrap();
+        let recipient: [u8; 32] = m[45..77].try_into().unwrap();
+        let body = m[77..].try_into().unwrap();
+        Self {
+            version,
+            nonce: u32::from_be_bytes(nonce),
+            origin: u32::from_be_bytes(origin),
+            sender: H256::from(sender),
+            destination: u32::from_be_bytes(destination),
+            recipient: H256::from(recipient),
+            body,
+        }
+    }
+}
+
+impl Encode for HyperlaneMessage {
+    fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+    where
+        W: std::io::Write,
+    {
+        writer.write_all(&self.version.to_be_bytes())?;
+        writer.write_all(&self.nonce.to_be_bytes())?;
+        writer.write_all(&self.origin.to_be_bytes())?;
+        writer.write_all(self.sender.as_ref())?;
+        writer.write_all(&self.destination.to_be_bytes())?;
+        writer.write_all(self.recipient.as_ref())?;
+        writer.write_all(&self.body)?;
+        Ok(HYPERLANE_MESSAGE_PREFIX_LEN + self.body.len())
+    }
+}
+
+impl Decode for HyperlaneMessage {
+    fn read_from<R>(reader: &mut R) -> Result<Self, HyperlaneError>
+    where
+        R: std::io::Read,
+    {
+        let mut version = [0u8; 1];
+        reader.read_exact(&mut version)?;
+
+        let mut nonce = [0u8; 4];
+        reader.read_exact(&mut nonce)?;
+
+        let mut origin = [0u8; 4];
+        reader.read_exact(&mut origin)?;
+
+        let mut sender = H256::zero();
+        reader.read_exact(sender.as_mut())?;
+
+        let mut destination = [0u8; 4];
+        reader.read_exact(&mut destination)?;
+
+        let mut recipient = H256::zero();
+        reader.read_exact(recipient.as_mut())?;
+
+        let mut body = vec![];
+        reader.read_to_end(&mut body)?;
+
+        Ok(Self {
+            version: u8::from_be_bytes(version),
+            nonce: u32::from_be_bytes(nonce),
+            origin: u32::from_be_bytes(origin),
+            sender,
+            destination: u32::from_be_bytes(destination),
+            recipient,
+            body,
+        })
+    }
+}
+
+impl HyperlaneMessage {
+    /// Convert the message to a message id
+    pub fn id(&self) -> H256 {
+        H256::from_slice(Keccak256::new().chain(&self.to_vec()).finalize().as_slice())
+    }
+
+    // Intnded for sealevel vm "event" (log message).
+    pub fn format(&self) -> Result<String, HyperlaneError> {
+        let mut serialized = vec![];
+        self.write_to(&mut serialized)?;
+        let encoded = bs58::encode(serialized).into_string();
+        Ok(encoded)
+    }
+
+    // Intended for sealevel vm "event" (log message).
+    pub fn parse(formatted: &[u8]) -> Result<Self, HyperlaneError> {
+        let decoded = bs58::decode(formatted).into_vec().map_err(|err| {
+            HyperlaneError::IoError(std::io::Error::new(std::io::ErrorKind::InvalidData, err))
+        })?;
+        Self::read_from(&mut std::io::Cursor::new(decoded))
+    }
+}
+
+impl std::fmt::Display for HyperlaneMessage {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "HyperlaneMessage {}->{}", self.origin, self.destination)
+    }
+}
diff --git a/rust/sealevel/hyperlane-core/src/types/mod.rs b/rust/sealevel/hyperlane-core/src/types/mod.rs
new file mode 100644
index 0000000000..130c275a24
--- /dev/null
+++ b/rust/sealevel/hyperlane-core/src/types/mod.rs
@@ -0,0 +1,4 @@
+pub mod message;
+pub use message::*;
+
+pub use primitive_types::{H256, U256};
diff --git a/rust/sealevel/programs/ism/rubber-stamp/Cargo.toml b/rust/sealevel/programs/ism/rubber-stamp/Cargo.toml
new file mode 100644
index 0000000000..7b194fde22
--- /dev/null
+++ b/rust/sealevel/programs/ism/rubber-stamp/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "hyperlane-sealevel-ism-rubber-stamp"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+no-entrypoint = []
+
+[dependencies]
+solana-program = "=1.14.3"
+hyperlane-sealevel-mailbox = { path = "../../mailbox", features = ["no-entrypoint"] }
+
+[lib]
+crate-type = ["cdylib", "lib"]
diff --git a/rust/sealevel/programs/ism/rubber-stamp/Xargo.toml b/rust/sealevel/programs/ism/rubber-stamp/Xargo.toml
new file mode 100644
index 0000000000..7aa7b48cf6
--- /dev/null
+++ b/rust/sealevel/programs/ism/rubber-stamp/Xargo.toml
@@ -0,0 +1,3 @@
+# FIXME do we need this?
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/rust/sealevel/programs/ism/rubber-stamp/src/lib.rs b/rust/sealevel/programs/ism/rubber-stamp/src/lib.rs
new file mode 100644
index 0000000000..d7fe903550
--- /dev/null
+++ b/rust/sealevel/programs/ism/rubber-stamp/src/lib.rs
@@ -0,0 +1,46 @@
+//! Interchain Security Module that unconditionally approves.
+//! **NOT INTENDED FOR USE IN PRODUCTION**
+
+#![deny(warnings)]
+// #![deny(missing_docs)] // FIXME
+#![deny(unsafe_code)]
+
+use std::str::FromStr as _;
+
+use hyperlane_sealevel_mailbox::instruction::IsmInstruction;
+use solana_program::{
+    account_info::{next_account_info, AccountInfo},
+    entrypoint,
+    entrypoint::ProgramResult,
+    msg,
+    program_error::ProgramError,
+    pubkey::Pubkey,
+};
+
+solana_program::declare_id!("YpYBDE5EsueaooNiYjgQ5PWcX9EB7kBpo3uufdDeLi7");
+
+#[cfg(not(feature = "no-entrypoint"))]
+entrypoint!(process_instruction);
+
+const AUTHORITY: &str = "7E7dbtWMktZB7rSkBecaayfhTaaavBKqKCjNzvspwycH";
+
+pub fn process_instruction(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    instruction_data: &[u8],
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+    let hyperlane_mailbox_auth = next_account_info(accounts_iter)?;
+    if hyperlane_mailbox_auth.key != &Pubkey::from_str(AUTHORITY).unwrap() {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if !hyperlane_mailbox_auth.is_signer {
+        return Err(ProgramError::MissingRequiredSignature);
+    }
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::InvalidArgument);
+    }
+    let _ixn = IsmInstruction::from_instruction_data(instruction_data)?;
+    msg!("hyperlane-sealevel-ism-rubber-stamp: LGTM!");
+    Ok(())
+}
diff --git a/rust/sealevel/programs/mailbox/Cargo.toml b/rust/sealevel/programs/mailbox/Cargo.toml
new file mode 100644
index 0000000000..d1be50af38
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "hyperlane-sealevel-mailbox"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+no-entrypoint = []
+
+[dependencies]
+hyperlane-core = { path = "../../hyperlane-core" }
+borsh = "0.9"
+num-derive = "0.3"
+num-traits = "0.2"
+solana-program = "=1.14.3"
+thiserror = "1.0"
+
+[dev-dependencies]
+base64 = "0.13"
+itertools =  "0.10.1"
+log = "0.4"
+testing_logger = "=0.1.1"
+
+[lib]
+crate-type = ["cdylib", "lib"]
diff --git a/rust/sealevel/programs/mailbox/README.md b/rust/sealevel/programs/mailbox/README.md
new file mode 100644
index 0000000000..4a7715ac2a
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/README.md
@@ -0,0 +1,6 @@
+FIXME 
+
+```rust
+cargo build-bpf
+cargo test-bpf -- --test-threads=1 --nocapture
+```
diff --git a/rust/sealevel/programs/mailbox/Xargo.toml b/rust/sealevel/programs/mailbox/Xargo.toml
new file mode 100644
index 0000000000..7aa7b48cf6
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/Xargo.toml
@@ -0,0 +1,3 @@
+# FIXME do we need this?
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/rust/sealevel/programs/mailbox/src/accounts.rs b/rust/sealevel/programs/mailbox/src/accounts.rs
new file mode 100644
index 0000000000..8d603df1f4
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/src/accounts.rs
@@ -0,0 +1,132 @@
+//! Hyperlane Sealevel Mailbox data account layouts.
+
+use std::{collections::HashSet, str::FromStr as _};
+
+use borsh::{BorshDeserialize, BorshSerialize};
+use hyperlane_core::{accumulator::incremental::IncrementalMerkle as MerkleTree, H256};
+use solana_program::{
+    account_info::AccountInfo,
+    program_error::ProgramError,
+    // Note: Not convinced program_pack::{IsInitialized, Pack} add value here.
+    pubkey::Pubkey,
+};
+
+use crate::{error::Error, DEFAULT_ISM, DEFAULT_ISM_ACCOUNTS};
+
+pub trait Data: BorshDeserialize + BorshSerialize + Default {}
+impl<T> Data for T where T: BorshDeserialize + BorshSerialize + Default {}
+
+/// Account data structure wrapper type that handles initialization and (de)serialization.
+///
+/// (De)serialization is done with borsh and the "on-disk" format is as follows:
+/// {
+///     initialized: bool,
+///     data: T,
+/// }
+#[derive(Debug, Default)]
+pub struct AccountData<T> {
+    data: T,
+}
+
+impl<T> From<T> for AccountData<T> {
+    fn from(data: T) -> Self {
+        Self { data }
+    }
+}
+
+impl<T> AccountData<T>
+where
+    T: Data,
+{
+    pub fn into_inner(self) -> T {
+        self.data
+    }
+
+    pub fn fetch(buf: &mut &[u8]) -> Result<Self, ProgramError> {
+        // Account data is zero initialized.
+        let initialized = bool::deserialize(buf)?;
+        let data = if initialized {
+            T::deserialize(buf)?
+        } else {
+            T::default()
+        };
+        Ok(Self { data })
+    }
+
+    // Optimisically write then realloc on failure.
+    // If we serialize and calculate len before realloc we will waste heap space as there is no
+    // free(). Tradeoff between heap usage and compute budget.
+    pub fn store<'a>(
+        &self,
+        account: &AccountInfo<'a>,
+        allow_realloc: bool,
+    ) -> Result<(), ProgramError> {
+        if !account.is_writable || account.executable {
+            return Err(ProgramError::from(Error::AccountReadOnly));
+        }
+        let realloc_increment = 1024;
+        loop {
+            let mut guard = account.try_borrow_mut_data()?;
+            let data = &mut *guard;
+            let data_len = data.len();
+            match true.serialize(data).and_then(|_| self.data.serialize(data)) {
+                Ok(_) => break,
+                Err(err) => match err.kind() {
+                    std::io::ErrorKind::WriteZero => {
+                        if !allow_realloc {
+                            return Err(ProgramError::BorshIoError(err.to_string()));
+                        }
+                    }
+                    _ => return Err(ProgramError::BorshIoError(err.to_string())),
+                },
+            };
+            drop(guard);
+            if cfg!(target_os = "solana") {
+                account.realloc(data_len + realloc_increment, false)?;
+            } else {
+                panic!("realloc() is only supported on the SVM");
+            }
+        }
+        Ok(())
+    }
+}
+
+pub type InboxAccount = AccountData<Inbox>;
+
+#[derive(BorshSerialize, BorshDeserialize, Debug)]
+pub struct Inbox {
+    pub local_domain: u32,
+    pub auth_bump_seed: u8,
+    pub inbox_bump_seed: u8,
+    // Note: 10MB account limit is around ~300k entries.
+    pub delivered: HashSet<H256>,
+    pub ism: Pubkey,
+    pub ism_accounts: Vec<Pubkey>,
+}
+
+impl Default for Inbox {
+    fn default() -> Self {
+        Self {
+            local_domain: 0,
+            auth_bump_seed: 0,
+            inbox_bump_seed: 0,
+            delivered: Default::default(),
+            // TODO can declare_id!() or similar be used for these to compute at compile time?
+            ism: Pubkey::from_str(DEFAULT_ISM).unwrap(),
+            ism_accounts: DEFAULT_ISM_ACCOUNTS
+                .iter()
+                .map(|account| Pubkey::from_str(account).unwrap())
+                .collect(),
+        }
+    }
+}
+
+pub type OutboxAccount = AccountData<Outbox>;
+
+#[derive(BorshSerialize, BorshDeserialize, Debug, Default)]
+pub struct Outbox {
+    pub local_domain: u32,
+    pub auth_bump_seed: u8,
+    pub outbox_bump_seed: u8,
+    pub tree: MerkleTree,
+}
diff --git a/rust/sealevel/programs/mailbox/src/error.rs b/rust/sealevel/programs/mailbox/src/error.rs
new file mode 100644
index 0000000000..12a31d109d
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/src/error.rs
@@ -0,0 +1,39 @@
+//! Hyperlane Sealevel mailbox contract specific errors.
+
+use solana_program::program_error::ProgramError;
+
+// Note: Not convinced that
+// solana_program::{decode_error::DecodeError, program_error::PrintProgramError} really add any
+// value here.
+#[derive(Copy, Clone, Debug, Eq, thiserror::Error, num_derive::FromPrimitive, PartialEq)]
+#[repr(u32)]
+pub enum Error {
+    #[error("Committed message is malformatted")]
+    MalformattedMessage = 1,
+    #[error("Hyperlane message is malformatted")]
+    MalformattedHyperlaneMessage = 2,
+    #[error("Unsupported message version")]
+    UnsupportedMessageVersion = 3,
+    #[error("Incorrect destination domain")]
+    IncorrectDestinationDomain = 4,
+    #[error("Message has already been processed")]
+    DuplicateMessage = 5,
+    #[error("Unused account(s) provided")]
+    ExtraneousAccount = 6,
+    #[error("Transaction log budget exceeded so cannot emit event")]
+    LogBudgetExceeded = 7,
+    #[error("Message is larger than the maximum allowed")]
+    MaxMessageSizeExceeded = 8,
+    #[error("Invalid account public key")]
+    InvalidPubkey = 9,
+    #[error("Account not found in the correct order")]
+    AccountOutOfOrder = 10,
+    #[error("Account is read only")]
+    AccountReadOnly = 11,
+}
+
+impl From<Error> for ProgramError {
+    fn from(err: Error) -> Self {
+        ProgramError::Custom(err as u32)
+    }
+}
diff --git a/rust/sealevel/programs/mailbox/src/instruction.rs b/rust/sealevel/programs/mailbox/src/instruction.rs
new file mode 100644
index 0000000000..fff2abf22c
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/src/instruction.rs
@@ -0,0 +1,110 @@
+//! API for Hyperlane Sealevel Mailbox smart contract.
+
+use borsh::{BorshDeserialize, BorshSerialize};
+use hyperlane_core::H256;
+use solana_program::{program_error::ProgramError, pubkey::Pubkey};
+
+/// Hyperlane mailbox protocol version.
+pub const VERSION: u8 = 2;
+
+/// Maximum bytes per message = 2 KiB (somewhat arbitrarily set to begin).
+pub const MAX_MESSAGE_BODY_BYTES: usize = 2 * 2_usize.pow(10);
+
+#[derive(BorshDeserialize, BorshSerialize, Debug, PartialEq)]
+pub enum Instruction {
+    Init(Init),
+    InboxProcess(InboxProcess),
+    InboxSetDefaultModule(InboxSetDefaultModule),
+    OutboxDispatch(OutboxDispatch),
+    OutboxGetCount(OutboxQuery),
+    OutboxGetLatestCheckpoint(OutboxQuery),
+    OutboxGetRoot(OutboxQuery),
+}
+
+impl Instruction {
+    pub fn from_instruction_data(data: &[u8]) -> Result<Self, ProgramError> {
+        Self::try_from_slice(data).map_err(|_| ProgramError::InvalidInstructionData)
+    }
+
+    pub fn into_instruction_data(self) -> Result<Vec<u8>, ProgramError> {
+        self.try_to_vec()
+            .map_err(|err| ProgramError::BorshIoError(err.to_string()))
+    }
+}
+
+#[derive(BorshDeserialize, BorshSerialize, Debug, PartialEq)]
+pub struct Init {
+    pub local_domain: u32,
+    pub auth_bump_seed: u8,
+    pub inbox_bump_seed: u8,
+    pub outbox_bump_seed: u8,
+}
+
+#[derive(BorshDeserialize, BorshSerialize, Debug, PartialEq)]
+pub struct OutboxDispatch {
+    pub sender: Pubkey,
+    pub local_domain: u32,
+    pub destination_domain: u32,
+    pub recipient: H256,
+    pub message_body: Vec<u8>,
+}
+
+#[derive(BorshDeserialize, BorshSerialize, Debug, PartialEq)]
+pub struct OutboxQuery {
+    pub local_domain: u32,
+}
+
+// Note: maximum transaction size is ~1kB, so will need to use accounts for large messages.
+#[derive(BorshDeserialize, BorshSerialize, Debug, PartialEq)]
+pub struct InboxProcess {
+    pub metadata: Vec<u8>, // Encoded Multi-Signature ISM data, or similar.
+    pub message: Vec<u8>,  // Encoded HyperlaneMessage
+}
+
+#[derive(BorshDeserialize, BorshSerialize, Debug, PartialEq)]
+pub struct InboxSetDefaultModule {
+    pub local_domain: u32,
+    pub program_id: Pubkey,
+    pub accounts: Vec<Pubkey>,
+}
+
+/// Instruction data format for an Interchain Security Module (ISM).
+///
+/// An ISM validates whether or not to accept a message. If the message should be rejected, the
+/// program will return an error and execution of the calling program will stop.
+#[derive(BorshSerialize, BorshDeserialize, Debug)]
+pub struct IsmInstruction {
+    /// Arbitrary data consumed by the ISM. Typically validator signatures, etc.
+    pub metadata: Vec<u8>,
+    /// The message to accept or reject.
+    pub message: Vec<u8>,
+}
+
+impl IsmInstruction {
+    pub fn from_instruction_data(data: &[u8]) -> Result<Self, ProgramError> {
+        Self::try_from_slice(data).map_err(|_| ProgramError::InvalidInstructionData)
+    }
+
+    pub fn into_instruction_data(self) -> Result<Vec<u8>, ProgramError> {
+        self.try_to_vec()
+            .map_err(|err| ProgramError::BorshIoError(err.to_string()))
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Debug)]
+pub struct RecipientInstruction {
+    pub sender: H256,
+    pub origin: u32,
+    pub message: Vec<u8>,
+}
+
+impl RecipientInstruction {
+    pub fn from_instruction_data(data: &[u8]) -> Result<Self, ProgramError> {
+        Self::try_from_slice(data).map_err(|_| ProgramError::InvalidInstructionData)
+    }
+
+    pub fn into_instruction_data(self) -> Result<Vec<u8>, ProgramError> {
+        self.try_to_vec()
+            .map_err(|err| ProgramError::BorshIoError(err.to_string()))
+    }
+}
diff --git a/rust/sealevel/programs/mailbox/src/lib.rs b/rust/sealevel/programs/mailbox/src/lib.rs
new file mode 100644
index 0000000000..e7233793b5
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/src/lib.rs
@@ -0,0 +1,20 @@
+//! Hyperlane bridge contract for Sealevel-compatible (Solana Virtual Machine) chains.
+
+#[deny(warnings)]
+// #[deny(missing_docs)] // FIXME
+#[deny(unsafe_code)]
+pub mod accounts;
+pub mod error;
+pub mod instruction;
+pub mod processor;
+
+pub use hyperlane_core;
+
+// FIXME Read these in at compile time?
+// solana_program::declare_id!("8TibDpWMQfTjG6JxvF85pxJXxwqXZUCuUx3Q1vwojvRh");
+solana_program::declare_id!("8oQPEeV1Uhmt4VNAdEojJewGnAuEi4pxBinbRvtKmiwJ");
+
+// FIXME set a sane default
+pub(crate) static DEFAULT_ISM: &str = "YpYBDE5EsueaooNiYjgQ5PWcX9EB7kBpo3uufdDeLi7";
+
+pub(crate) static DEFAULT_ISM_ACCOUNTS: &[&str] = &[];
diff --git a/rust/sealevel/programs/mailbox/src/processor.rs b/rust/sealevel/programs/mailbox/src/processor.rs
new file mode 100644
index 0000000000..7a7d876539
--- /dev/null
+++ b/rust/sealevel/programs/mailbox/src/processor.rs
@@ -0,0 +1,855 @@
+//! Entrypoint, dispatch, and execution for the Hyperlane Sealevel mailbox instruction.
+
+use hyperlane_core::{Decode, HyperlaneMessage, H256};
+#[cfg(not(feature = "no-entrypoint"))]
+use solana_program::entrypoint;
+use solana_program::{
+    account_info::next_account_info,
+    account_info::AccountInfo,
+    entrypoint::ProgramResult,
+    instruction::{AccountMeta, Instruction},
+    msg,
+    program::{invoke_signed, set_return_data},
+    program_error::ProgramError,
+    pubkey::Pubkey,
+    system_instruction,
+    sysvar::rent::Rent,
+};
+
+use crate::{
+    accounts::{Inbox, InboxAccount, Outbox, OutboxAccount},
+    error::Error,
+    instruction::{
+        InboxProcess, InboxSetDefaultModule, Init, Instruction as MailboxIxn, IsmInstruction,
+        OutboxDispatch, OutboxQuery, RecipientInstruction, MAX_MESSAGE_BODY_BYTES, VERSION,
+    },
+};
+
+#[cfg(not(feature = "no-entrypoint"))]
+entrypoint!(process_instruction);
+
+pub fn process_instruction(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    instruction_data: &[u8],
+) -> ProgramResult {
+    match MailboxIxn::from_instruction_data(instruction_data)? {
+        MailboxIxn::Init(init) => initialize(program_id, accounts, init),
+        MailboxIxn::InboxProcess(process) => inbox_process(program_id, accounts, process),
+        MailboxIxn::InboxSetDefaultModule(ism) => inbox_set_default_ism(program_id, accounts, ism),
+        MailboxIxn::OutboxDispatch(dispatch) => outbox_dispatch(program_id, accounts, dispatch),
+        MailboxIxn::OutboxGetCount(query) => outbox_get_count(program_id, accounts, query),
+        MailboxIxn::OutboxGetLatestCheckpoint(query) => {
+            outbox_get_latest_checkpoint(program_id, accounts, query)
+        }
+        MailboxIxn::OutboxGetRoot(query) => outbox_get_root(program_id, accounts, query),
+    }
+    // .map_err(|err| {
+    //     err.print::<crate::error::Error>();
+    //     err
+    // })
+}
+
+fn initialize(program_id: &Pubkey, accounts: &[AccountInfo], init: Init) -> ProgramResult {
+    // On chain create appears to use realloc which is limited to 1024 byte increments.
+    let mailbox_size = 2048;
+    let accounts_iter = &mut accounts.iter();
+
+    let system_program = next_account_info(accounts_iter)?;
+    if system_program.key != &solana_program::system_program::ID {
+        return Err(ProgramError::InvalidArgument);
+    }
+
+    let payer_account = next_account_info(accounts_iter)?;
+
+    let auth_account = next_account_info(accounts_iter)?;
+    let (auth_key, auth_bump) = Pubkey::find_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &init.local_domain.to_le_bytes(),
+            b"-",
+            b"authority",
+        ],
+        program_id,
+    );
+    if &auth_key != auth_account.key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    invoke_signed(
+        &system_instruction::create_account(
+            payer_account.key,
+            auth_account.key,
+            Rent::default().minimum_balance(0),
+            0,
+            program_id,
+        ),
+        &[
+            system_program.clone(),
+            payer_account.clone(),
+            auth_account.clone(),
+        ],
+        &[&[
+            b"hyperlane",
+            b"-",
+            &init.local_domain.to_le_bytes(),
+            b"-",
+            b"authority",
+            &[auth_bump],
+        ]],
+    )?;
+
+    let inbox_account = next_account_info(accounts_iter)?;
+    let (inbox_key, inbox_bump) = Pubkey::find_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &init.local_domain.to_le_bytes(),
+            b"-",
+            b"inbox",
+        ],
+        program_id,
+    );
+    if &inbox_key != inbox_account.key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    invoke_signed(
+        &system_instruction::create_account(
+            payer_account.key,
+            inbox_account.key,
+            Rent::default().minimum_balance(mailbox_size.try_into().unwrap()),
+            mailbox_size,
+            program_id,
+        ),
+        &[
+            system_program.clone(),
+            payer_account.clone(),
+            inbox_account.clone(),
+        ],
+        &[&[
+            b"hyperlane",
+            b"-",
+            &init.local_domain.to_le_bytes(),
+            b"-",
+            b"inbox",
+            &[inbox_bump],
+        ]],
+    )?;
+
+    let outbox_account = next_account_info(accounts_iter)?;
+    let (outbox_key, outbox_bump) = Pubkey::find_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &init.local_domain.to_le_bytes(),
+            b"-",
+            b"outbox",
+        ],
+        program_id,
+    );
+    if &outbox_key != outbox_account.key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    invoke_signed(
+        &system_instruction::create_account(
+            payer_account.key,
+            outbox_account.key,
+            Rent::default().minimum_balance(mailbox_size.try_into().unwrap()),
+            mailbox_size,
+            program_id,
+        ),
+        &[
+            system_program.clone(),
+            payer_account.clone(),
+            outbox_account.clone(),
+        ],
+        &[&[
+            b"hyperlane",
+            b"-",
+            &init.local_domain.to_le_bytes(),
+            b"-",
+            b"outbox",
+            &[outbox_bump],
+        ]],
+    )?;
+
+    let inbox = Inbox {
+        local_domain: init.local_domain,
+        auth_bump_seed: auth_bump,
+        inbox_bump_seed: inbox_bump,
+        ..Default::default()
+    };
+    InboxAccount::from(inbox).store(inbox_account, true)?;
+
+    let outbox = Outbox {
+        local_domain: init.local_domain,
+        auth_bump_seed: auth_bump,
+        outbox_bump_seed: outbox_bump,
+        ..Default::default()
+    };
+    OutboxAccount::from(outbox).store(outbox_account, true)?;
+
+    Ok(())
+}
+
+// TODO add more strict checks on permissions for all accounts that are passed in, e.g., bail if
+// we expected an account to be read only but it is writable. Could build this into the AccountData
+// struct impl and provide more fetch methods.
+fn inbox_process(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    process: InboxProcess,
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+
+    let message = HyperlaneMessage::read_from(&mut std::io::Cursor::new(process.message))
+        .map_err(|_| ProgramError::from(Error::MalformattedHyperlaneMessage))?;
+    if message.version != VERSION {
+        return Err(ProgramError::from(Error::UnsupportedMessageVersion));
+    }
+    let local_domain = message.destination;
+
+    let inbox_account = next_account_info(accounts_iter)?;
+    let mut inbox = InboxAccount::fetch(&mut &inbox_account.data.borrow_mut()[..])?.into_inner();
+    let expected_inbox_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &local_domain.to_le_bytes(),
+            b"-",
+            b"inbox",
+            &[inbox.inbox_bump_seed],
+        ],
+        program_id,
+    )?;
+    if inbox_account.key != &expected_inbox_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if inbox_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    let auth_account = next_account_info(accounts_iter)?;
+    let expected_auth_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &local_domain.to_le_bytes(),
+            b"-",
+            b"authority",
+            &[inbox.auth_bump_seed],
+        ],
+        program_id,
+    )?;
+    if auth_account.key != &expected_auth_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if auth_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    let id = message.id();
+    if inbox.delivered.contains(&id) {
+        return Err(ProgramError::from(Error::DuplicateMessage));
+    }
+    inbox.delivered.insert(id);
+
+    let ism_ixn = IsmInstruction {
+        metadata: process.metadata,
+        message: message.body.clone(),
+    };
+    if inbox.ism != *next_account_info(accounts_iter)?.key {
+        return Err(ProgramError::from(Error::AccountOutOfOrder));
+    }
+    let mut ism_accounts = vec![auth_account.clone()];
+    let mut ism_account_metas = vec![AccountMeta {
+        pubkey: *auth_account.key,
+        is_signer: true,
+        is_writable: false,
+    }];
+    for pubkey in &inbox.ism_accounts {
+        let meta = AccountMeta {
+            pubkey: *pubkey,
+            // TODO this should probably be provided up front...
+            is_signer: false,
+            is_writable: false,
+        };
+        let info = next_account_info(accounts_iter)?;
+        if info.key != pubkey {
+            return Err(ProgramError::from(Error::AccountOutOfOrder));
+        }
+        ism_accounts.push(info.clone());
+        ism_account_metas.push(meta);
+    }
+    let verify = Instruction::new_with_borsh(inbox.ism, &ism_ixn, ism_account_metas);
+
+    let recp_ixn = RecipientInstruction {
+        sender: message.sender,
+        origin: message.origin,
+        message: message.body,
+    };
+    let recp_prog_id = Pubkey::new_from_array(message.recipient.0);
+    if recp_prog_id != *next_account_info(accounts_iter)?.key {
+        return Err(ProgramError::from(Error::AccountOutOfOrder));
+    }
+    let mut recp_accounts = vec![auth_account.clone()];
+    let mut recp_account_metas = vec![AccountMeta {
+        pubkey: *auth_account.key,
+        is_signer: true,
+        is_writable: false,
+    }];
+    for account in [] {
+        // TODO recipient accounts must be provided up front
+        let pubkey = Pubkey::new_from_array(account);
+        let meta = AccountMeta {
+            pubkey,
+            // TODO this should probably be provided up front...
+            is_signer: false,
+            is_writable: false,
+        };
+        let info = next_account_info(accounts_iter)?;
+        if info.key != &pubkey {
+            return Err(ProgramError::from(Error::AccountOutOfOrder));
+        }
+        recp_accounts.push(info.clone());
+        recp_account_metas.push(meta);
+    }
+    let recieve =
+        Instruction::new_with_borsh(message.recipient.0.into(), &recp_ixn, recp_account_metas);
+
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::from(Error::ExtraneousAccount));
+    }
+    let auth_seeds: &[&[u8]] = &[
+        b"hyperlane",
+        b"-",
+        &inbox.local_domain.to_le_bytes(),
+        b"-",
+        b"authority",
+        &[inbox.auth_bump_seed],
+    ];
+    invoke_signed(&verify, &ism_accounts, &[auth_seeds])?;
+    invoke_signed(&recieve, &recp_accounts, &[auth_seeds])?;
+    msg!("Hyperlane inbox: {:?}", id);
+
+    InboxAccount::from(inbox).store(inbox_account, true)?;
+    Ok(())
+}
+
+fn inbox_set_default_ism(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    ism: InboxSetDefaultModule,
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+
+    let inbox_account = next_account_info(accounts_iter)?;
+    let mut inbox = InboxAccount::fetch(&mut &inbox_account.data.borrow_mut()[..])?.into_inner();
+    let expected_inbox_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &ism.local_domain.to_le_bytes(),
+            b"-",
+            b"inbox",
+            &[inbox.inbox_bump_seed],
+        ],
+        program_id,
+    )?;
+    if inbox_account.key != &expected_inbox_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if inbox_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::from(Error::ExtraneousAccount));
+    }
+
+    inbox.ism = ism.program_id;
+    inbox.ism_accounts = ism.accounts;
+    InboxAccount::from(inbox).store(inbox_account, true)?;
+
+    Ok(())
+}
+
+fn outbox_dispatch(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    dispatch: OutboxDispatch,
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+
+    let outbox_account = next_account_info(accounts_iter)?;
+    let mut outbox = OutboxAccount::fetch(&mut &outbox_account.data.borrow_mut()[..])?.into_inner();
+    let expected_outbox_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &dispatch.local_domain.to_le_bytes(),
+            b"-",
+            b"outbox",
+            &[outbox.outbox_bump_seed],
+        ],
+        program_id,
+    )?;
+    if outbox_account.key != &expected_outbox_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if outbox_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::from(Error::ExtraneousAccount));
+    }
+    if dispatch.message_body.len() > MAX_MESSAGE_BODY_BYTES {
+        return Err(ProgramError::from(Error::MaxMessageSizeExceeded));
+    }
+
+    let count = outbox
+        .tree
+        .count()
+        .try_into()
+        .expect("Too many messages in outbox tree");
+    let message = HyperlaneMessage {
+        version: VERSION,
+        nonce: count,
+        origin: dispatch.local_domain,
+        sender: H256(dispatch.sender.to_bytes()),
+        destination: dispatch.destination_domain,
+        recipient: dispatch.recipient,
+        body: dispatch.message_body,
+    };
+    let formatted = message
+        .format()
+        .map_err(|_| ProgramError::from(Error::MalformattedMessage))?;
+    // TODO Get this dynamically: https://github.com/solana-labs/solana/issues/23653
+    let remaining_log_budget_bytes = 10_000 - 18; // Default minus our log message prefix.
+    if formatted.len() > remaining_log_budget_bytes {
+        return Err(ProgramError::from(Error::LogBudgetExceeded));
+    }
+
+    let id = message.id();
+    outbox.tree.ingest(id);
+    msg!("Hyperlane outbox: {}", &formatted);
+
+    OutboxAccount::from(outbox).store(outbox_account, true)?;
+
+    set_return_data(id.as_ref());
+    Ok(())
+}
+
+fn outbox_get_count(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    query: OutboxQuery,
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+
+    let outbox_account = next_account_info(accounts_iter)?;
+    let outbox = OutboxAccount::fetch(&mut &outbox_account.data.borrow_mut()[..])?.into_inner();
+    let expected_outbox_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &query.local_domain.to_le_bytes(),
+            b"-",
+            b"outbox",
+            &[outbox.outbox_bump_seed],
+        ],
+        program_id,
+    )?;
+    if outbox_account.key != &expected_outbox_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if outbox_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::from(Error::ExtraneousAccount));
+    }
+
+    let count: u32 = outbox
+        .tree
+        .count()
+        .try_into()
+        .expect("Too many messages in outbox tree");
+    set_return_data(&count.to_le_bytes());
+    Ok(())
+}
+
+fn outbox_get_latest_checkpoint(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    query: OutboxQuery,
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+
+    let outbox_account = next_account_info(accounts_iter)?;
+    let outbox = OutboxAccount::fetch(&mut &outbox_account.data.borrow_mut()[..])?.into_inner();
+    let expected_outbox_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &query.local_domain.to_le_bytes(),
+            b"-",
+            b"outbox",
+            &[outbox.outbox_bump_seed],
+        ],
+        program_id,
+    )?;
+    if outbox_account.key != &expected_outbox_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if outbox_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::from(Error::ExtraneousAccount));
+    }
+
+    let root = outbox.tree.root();
+    let count: u32 = outbox
+        .tree
+        .count()
+        .try_into()
+        .expect("Too many messages in outbox tree");
+
+    let mut ret_buf = [0; 36];
+    ret_buf[0..31].copy_from_slice(root.as_ref());
+    ret_buf[32..].copy_from_slice(&count.to_le_bytes());
+    set_return_data(&ret_buf);
+    Ok(())
+}
+
+fn outbox_get_root(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    query: OutboxQuery,
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+
+    let outbox_account = next_account_info(accounts_iter)?;
+    let outbox = OutboxAccount::fetch(&mut &outbox_account.data.borrow_mut()[..])?.into_inner();
+    let expected_outbox_key = Pubkey::create_program_address(
+        &[
+            b"hyperlane",
+            b"-",
+            &query.local_domain.to_le_bytes(),
+            b"-",
+            b"outbox",
+            &[outbox.outbox_bump_seed],
+        ],
+        program_id,
+    )?;
+    if outbox_account.key != &expected_outbox_key {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if outbox_account.owner != program_id {
+        return Err(ProgramError::IncorrectProgramId);
+    }
+
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::from(Error::ExtraneousAccount));
+    }
+
+    let root = outbox.tree.root();
+    set_return_data(root.as_ref());
+    Ok(())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    use std::str::FromStr as _;
+
+    use hyperlane_core::{accumulator::incremental::IncrementalMerkle as MerkleTree, Encode};
+    use itertools::Itertools as _;
+    use solana_program::clock::Epoch;
+
+    struct SyscallStubs {}
+    impl solana_program::program_stubs::SyscallStubs for SyscallStubs {
+        fn sol_log(&self, message: &str) {
+            log::info!("{}", message);
+        }
+        fn sol_log_data(&self, fields: &[&[u8]]) {
+            log::info!("data: {}", fields.iter().map(base64::encode).join(" "));
+        }
+    }
+
+    struct ExampleMetadata {
+        // Depends on which ISM is used.
+        pub root: H256,
+        pub index: u32,
+        pub leaf_index: u32,
+        // pub proof: [H256; 32],
+        pub signatures: Vec<H256>,
+    }
+    impl Encode for ExampleMetadata {
+        fn write_to<W>(&self, writer: &mut W) -> std::io::Result<usize>
+        where
+            W: std::io::Write,
+        {
+            writer.write_all(&self.root.as_ref())?;
+            writer.write_all(&self.index.to_be_bytes())?;
+            writer.write_all(&self.leaf_index.to_be_bytes())?;
+            // for hash in self.proof {
+            //     writer.write_all(hash.as_ref())?;
+            // }
+            for signature in &self.signatures {
+                writer.write_all(signature.as_ref())?;
+            }
+            Ok(32 + 4 + 4 + (32 * 32) + (self.signatures.len() * 32))
+        }
+    }
+
+    fn setup_logging() {
+        solana_program::program_stubs::set_syscall_stubs(Box::new(SyscallStubs {}));
+        testing_logger::setup();
+    }
+
+    #[test]
+    fn test_inbox_process() {
+        setup_logging();
+
+        let local_domain = u32::MAX;
+        let mailbox_program_id = Pubkey::new_unique();
+
+        let (auth_account_key, auth_bump_seed) = Pubkey::find_program_address(
+            &[
+                b"hyperlane",
+                b"-",
+                &local_domain.to_le_bytes(),
+                b"-",
+                b"authority",
+            ],
+            &mailbox_program_id,
+        );
+        let mut auth_account_lamports = 0;
+        let mut auth_account_data = vec![];
+        let auth_account = AccountInfo::new(
+            // Public key of the account
+            &auth_account_key,
+            // Was the transaction signed by this account's public key?
+            false,
+            // Is the account writable?
+            true,
+            // The lamports in the account. Modifiable by programs.
+            &mut auth_account_lamports,
+            // The data held in this account. Modifiable by programs.
+            &mut auth_account_data,
+            // Program that owns this account.
+            &mailbox_program_id,
+            // This account's data contains a loaded program (and is now read-only).
+            false,
+            // The epoch at which this account will next owe rent.
+            Epoch::default(),
+        );
+
+        let (inbox_account_key, inbox_bump_seed) = Pubkey::find_program_address(
+            &[
+                b"hyperlane",
+                b"-",
+                &local_domain.to_le_bytes(),
+                b"-",
+                b"inbox",
+            ],
+            &mailbox_program_id,
+        );
+        let mut inbox_account_lamports = 0;
+        let mut inbox_account_data = vec![0_u8; 2048];
+        let inbox_account = AccountInfo::new(
+            &inbox_account_key,
+            false,
+            true,
+            &mut inbox_account_lamports,
+            &mut inbox_account_data,
+            &mailbox_program_id,
+            false,
+            Epoch::default(),
+        );
+        let inbox_init_data = Inbox {
+            local_domain,
+            auth_bump_seed,
+            inbox_bump_seed,
+            ..Default::default()
+        };
+        InboxAccount::from(inbox_init_data)
+            .store(&inbox_account, false)
+            .unwrap();
+
+        let ism_account_key = Pubkey::from_str(crate::DEFAULT_ISM).unwrap();
+        let mut ism_account_lamports = 0;
+        let mut ism_account_data = vec![0_u8; 1024];
+        let ism_account = AccountInfo::new(
+            &ism_account_key,
+            false,
+            false,
+            &mut ism_account_lamports,
+            &mut ism_account_data,
+            &mailbox_program_id,
+            true,
+            Epoch::default(),
+        );
+        // Must add to account vec further down if/when there are ism data accounts.
+        assert!(crate::DEFAULT_ISM_ACCOUNTS.is_empty());
+
+        let recp_account_key = Pubkey::new_from_array([42; 32]);
+        let mut recp_account_lamports = 0;
+        let mut recp_account_data = vec![0_u8; 1024];
+        let recp_account = AccountInfo::new(
+            &recp_account_key,
+            false,
+            false,
+            &mut recp_account_lamports,
+            &mut recp_account_data,
+            &mailbox_program_id,
+            true,
+            Epoch::default(),
+        );
+        // Assume no recpient data accounts for now.
+
+        let message = HyperlaneMessage {
+            version: VERSION,
+            nonce: 1,
+            origin: u32::MAX,
+            sender: H256::repeat_byte(69),
+            destination: u32::MAX,
+            recipient: H256::from(recp_account_key.to_bytes()),
+            body: "Hello, World!".bytes().collect(),
+        };
+        let mut encoded_message = vec![];
+        message.write_to(&mut encoded_message).unwrap();
+        let metadata = ExampleMetadata {
+            root: Default::default(),
+            index: 1,
+            signatures: vec![],
+            // proof: Default::default(),
+            leaf_index: message.nonce,
+        };
+        let mut encoded_metadata = vec![];
+        metadata.write_to(&mut encoded_metadata).unwrap();
+        let accounts = [inbox_account, auth_account, ism_account, recp_account];
+        let inbox_process = InboxProcess {
+            metadata: encoded_metadata,
+            message: encoded_message,
+        };
+        let instruction_data = MailboxIxn::InboxProcess(inbox_process)
+            .into_instruction_data()
+            .unwrap();
+
+        let inbox = InboxAccount::fetch(&mut &accounts[0].data.borrow_mut()[..])
+            .unwrap()
+            .into_inner();
+        assert_eq!(inbox.delivered.len(), 0);
+
+        process_instruction(&mailbox_program_id, &accounts, &instruction_data).unwrap();
+        testing_logger::validate(|logs| {
+            assert_eq!(logs.len(), 3);
+            assert_eq!(logs[0].level, log::Level::Info);
+            assert_eq!(
+                logs[0].body,
+                "SyscallStubs: sol_invoke_signed() not available"
+            );
+            assert_eq!(logs[1].level, log::Level::Info);
+            assert_eq!(
+                logs[1].body,
+                "SyscallStubs: sol_invoke_signed() not available"
+            );
+            assert_eq!(logs[2].level, log::Level::Info);
+            assert_eq!(
+                logs[2].body,
+                "Hyperlane inbox: 0x4cd9e947a4cd81f0c32bc2c167648185ff0c389e8a881cdd362707c956f31103"
+            );
+        });
+        let inbox = InboxAccount::fetch(&mut &accounts[0].data.borrow_mut()[..])
+            .unwrap()
+            .into_inner();
+        assert_eq!(inbox.delivered.len(), 1);
+        assert!(inbox.delivered.contains(
+            &H256::from_str("0x4cd9e947a4cd81f0c32bc2c167648185ff0c389e8a881cdd362707c956f31103")
+                .unwrap()
+        ));
+    }
+
+    #[test]
+    fn test_outbox_dispatch() {
+        setup_logging();
+
+        let local_domain = u32::MAX;
+        let mailbox_program_id = Pubkey::new_unique();
+
+        let (outbox_account_key, outbox_bump_seed) = Pubkey::find_program_address(
+            &[
+                b"hyperlane",
+                b"-",
+                &local_domain.to_le_bytes(),
+                b"-",
+                b"outbox",
+            ],
+            &mailbox_program_id,
+        );
+        let mut outbox_account_lamports = 0;
+        let mut outbox_account_data = vec![0_u8; 2048];
+        let outbox_account = AccountInfo::new(
+            &outbox_account_key,
+            false,
+            true,
+            &mut outbox_account_lamports,
+            &mut outbox_account_data,
+            &mailbox_program_id,
+            false,
+            Epoch::default(),
+        );
+        let outbox_init_data = Outbox {
+            local_domain,
+            outbox_bump_seed,
+            ..Default::default()
+        };
+        OutboxAccount::from(outbox_init_data)
+            .store(&outbox_account, false)
+            .unwrap();
+
+        let message = OutboxDispatch {
+            sender: Pubkey::new_from_array([6; 32]),
+            local_domain: u32::MAX,
+            destination_domain: u32::MAX,
+            recipient: H256([9; 32]),
+            message_body: "Hello, World!".bytes().collect(),
+        };
+        let instruction_data = MailboxIxn::OutboxDispatch(message)
+            .into_instruction_data()
+            .unwrap();
+
+        let accounts = vec![outbox_account];
+        let outbox = OutboxAccount::fetch(&mut &accounts[0].data.borrow_mut()[..])
+            .unwrap()
+            .into_inner();
+        assert_eq!(outbox.tree.count(), 0);
+        assert_eq!(outbox.tree.root(), MerkleTree::default().root());
+
+        process_instruction(&mailbox_program_id, &accounts, &instruction_data).unwrap();
+        testing_logger::validate(|logs| {
+            assert_eq!(logs.len(), 1);
+            assert_eq!(logs[0].level, log::Level::Info);
+            assert_eq!(
+                logs[0].body,
+                "Hyperlane outbox: KBTLbtJtuLbxrn6hwiZ2SfQbdTYBxs8uAaHzTudgjtMZV4f9cHyEjvbPV3sXn9ftPHZJCzNy9pJZ9SLJmarEgq1wZV9Dsm4PcDyqGCCdryDCvKQTDKhyUfgtRn"
+            );
+        });
+        let outbox = OutboxAccount::fetch(&mut &accounts[0].data.borrow_mut()[..])
+            .unwrap()
+            .into_inner();
+        assert_eq!(outbox.tree.count(), 1);
+        assert_eq!(
+            outbox.tree.root(),
+            H256::from_str("0x6589cdd914158e71aa9beb14d1a42298918f2b3321f9f3bcd7aef06ede255145")
+                .unwrap()
+        );
+    }
+}
diff --git a/rust/sealevel/programs/recipient/echo/Cargo.toml b/rust/sealevel/programs/recipient/echo/Cargo.toml
new file mode 100644
index 0000000000..f7d92cbff3
--- /dev/null
+++ b/rust/sealevel/programs/recipient/echo/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "hyperlane-sealevel-recipient-echo"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+no-entrypoint = []
+
+[dependencies]
+solana-program = "=1.14.3"
+hyperlane-sealevel-mailbox = { path = "../../mailbox", features = ["no-entrypoint"] }
+
+[lib]
+crate-type = ["cdylib", "lib"]
diff --git a/rust/sealevel/programs/recipient/echo/Xargo.toml b/rust/sealevel/programs/recipient/echo/Xargo.toml
new file mode 100644
index 0000000000..7aa7b48cf6
--- /dev/null
+++ b/rust/sealevel/programs/recipient/echo/Xargo.toml
@@ -0,0 +1,3 @@
+# FIXME do we need this?
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/rust/sealevel/programs/recipient/echo/src/lib.rs b/rust/sealevel/programs/recipient/echo/src/lib.rs
new file mode 100644
index 0000000000..50e2a4ba6b
--- /dev/null
+++ b/rust/sealevel/programs/recipient/echo/src/lib.rs
@@ -0,0 +1,49 @@
+//! Hyperlane recipient contract that just logs the message data byte vector.
+//! **NOT INTENDED FOR USE IN PRODUCTION**
+//!
+//! Note that a real recipient must define the format for its message and that format is specific
+//! to that recipient.
+
+#![deny(warnings)]
+// #![deny(missing_docs)] // FIXME
+#![deny(unsafe_code)]
+
+use std::str::FromStr as _;
+
+use hyperlane_sealevel_mailbox::instruction::RecipientInstruction;
+use solana_program::{
+    account_info::{next_account_info, AccountInfo},
+    entrypoint,
+    entrypoint::ProgramResult,
+    msg,
+    program_error::ProgramError,
+    pubkey::Pubkey,
+};
+
+solana_program::declare_id!("CFpo3LDZm2nPujHLoHNxtmY6WZwjKSVY78aMBYf9hLZE");
+
+#[cfg(not(feature = "no-entrypoint"))]
+entrypoint!(process_instruction);
+
+const AUTHORITY: &str = "7E7dbtWMktZB7rSkBecaayfhTaaavBKqKCjNzvspwycH";
+
+pub fn process_instruction(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    instruction_data: &[u8],
+) -> ProgramResult {
+    let accounts_iter = &mut accounts.iter();
+    let hyperlane_mailbox_auth = next_account_info(accounts_iter)?;
+    if hyperlane_mailbox_auth.key != &Pubkey::from_str(AUTHORITY).unwrap() {
+        return Err(ProgramError::InvalidArgument);
+    }
+    if !hyperlane_mailbox_auth.is_signer {
+        return Err(ProgramError::MissingRequiredSignature);
+    }
+    if accounts_iter.next().is_some() {
+        return Err(ProgramError::InvalidArgument);
+    }
+    let ixn = RecipientInstruction::from_instruction_data(instruction_data)?;
+    msg!("hyperlane-sealevel-recipient-echo: {:?}", ixn);
+    Ok(())
+}
diff --git a/rust/sealevel/rust-toolchain b/rust/sealevel/rust-toolchain
new file mode 100644
index 0000000000..4d5fde5bd1
--- /dev/null
+++ b/rust/sealevel/rust-toolchain
@@ -0,0 +1 @@
+1.60.0
diff --git a/rust/sealevel/scripts/README.md b/rust/sealevel/scripts/README.md
new file mode 100644
index 0000000000..9f74f93877
--- /dev/null
+++ b/rust/sealevel/scripts/README.md
@@ -0,0 +1,3 @@
+# Scripts
+
+Utility scripts taken from https://github.com/hashblock/solana-cli-program-template
diff --git a/rust/sealevel/scripts/patch.crates-io.sh b/rust/sealevel/scripts/patch.crates-io.sh
new file mode 100755
index 0000000000..584f258832
--- /dev/null
+++ b/rust/sealevel/scripts/patch.crates-io.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+#
+# Patches the SPL crates for developing against a local solana monorepo
+#
+
+solana_dir=$1
+if [[ -z $solana_dir ]]; then
+  echo "Usage: $0 <path-to-solana-monorepo>"
+  exit 1
+fi
+
+workspace_crates=(
+  Cargo.toml
+)
+
+if [[ ! -r "$solana_dir"/scripts/read-cargo-variable.sh ]]; then
+  echo "$solana_dir is not a path to the solana monorepo"
+  exit 1
+fi
+
+set -e
+
+solana_dir=$(cd "$solana_dir" && pwd)
+cd "$(dirname "$0")"
+
+source "$solana_dir"/scripts/read-cargo-variable.sh
+solana_ver=$(readCargoVariable version "$solana_dir"/sdk/Cargo.toml)
+
+echo "Patching in $solana_ver from $solana_dir"
+echo
+for crate in "${workspace_crates[@]}"; do
+  if grep -q '\[patch.crates-io\]' "$crate"; then
+    echo "$crate is already patched"
+  else
+    cat >> "$crate" <<PATCH
+[patch.crates-io]
+solana-account-decoder = {path = "$solana_dir/account-decoder" }
+solana-banks-client = { path = "$solana_dir/banks-client"}
+solana-banks-server = { path = "$solana_dir/banks-server"}
+solana-bpf-loader-program = { path = "$solana_dir/programs/bpf_loader" }
+solana-clap-utils = {path = "$solana_dir/clap-utils" }
+solana-cli-config = {path = "$solana_dir/cli-config" }
+solana-cli-output = {path = "$solana_dir/cli-output" }
+solana-client = { path = "$solana_dir/client"}
+solana-core = { path = "$solana_dir/core"}
+solana-logger = {path = "$solana_dir/logger" }
+solana-notifier = { path = "$solana_dir/notifier" }
+solana-remote-wallet = {path = "$solana_dir/remote-wallet" }
+solana-program = { path = "$solana_dir/sdk/program" }
+solana-program-test = { path = "$solana_dir/program-test" }
+solana-runtime = { path = "$solana_dir/runtime" }
+solana-sdk = { path = "$solana_dir/sdk" }
+solana-stake-program = { path = "$solana_dir/programs/stake" }
+solana-transaction-status = { path = "$solana_dir/transaction-status" }
+solana-validator = { path = "$solana_dir/validator" }
+solana-vote-program = { path = "$solana_dir/programs/vote" }
+PATCH
+  fi
+done
+
+./update-solana-dependencies.sh "$solana_ver"
diff --git a/rust/sealevel/scripts/update-solana-dependencies.sh b/rust/sealevel/scripts/update-solana-dependencies.sh
new file mode 100755
index 0000000000..3fc48e5615
--- /dev/null
+++ b/rust/sealevel/scripts/update-solana-dependencies.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+#
+# Updates the solana version in all the SPL crates
+#
+
+solana_ver=$1
+if [[ -z $solana_ver ]]; then
+  echo "Usage: $0 <new-solana-version>"
+  exit 1
+fi
+
+cd "$(dirname "$0")"
+
+declare tomls=()
+while IFS='' read -r line; do tomls+=("$line"); done < <(find . -name Cargo.toml)
+
+crates=(
+  solana-account-decoder
+  solana-banks-client
+  solana-banks-server
+  solana-bpf-loader-program
+  solana-clap-utils
+  solana-cli-config
+  solana-cli-output
+  solana-client
+  solana-core
+  solana-logger
+  solana-notifier
+  solana-program
+  solana-program-test
+  solana-remote-wallet
+  solana-runtime
+  solana-sdk
+  solana-stake-program
+  solana-transaction-status
+  solana-validator
+  solana-vote-program
+)
+
+set -x
+for crate in "${crates[@]}"; do
+  sed -i -e "s#\(${crate} = \"\)\(=\?\).*\(\"\)#\1\2$solana_ver\3#g" "${tomls[@]}"
+done