diff --git a/.github/workflows/publish-rust-lazer-publisher-sdk.yml b/.github/workflows/publish-rust-lazer-publisher-sdk.yml
index 453dfbf0e5..0bc62c5459 100644
--- a/.github/workflows/publish-rust-lazer-publisher-sdk.yml
+++ b/.github/workflows/publish-rust-lazer-publisher-sdk.yml
@@ -12,6 +12,10 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v3
+        with:
+          version: "30.2"
 
       - run: ./publish.sh
         env:
diff --git a/lazer/Cargo.lock b/lazer/Cargo.lock
index a72b243fa0..94731d0909 100644
--- a/lazer/Cargo.lock
+++ b/lazer/Cargo.lock
@@ -3864,7 +3864,7 @@ dependencies = [
 
 [[package]]
 name = "pyth-lazer-publisher-sdk"
-version = "0.1.1"
+version = "0.1.2"
 dependencies = [
  "protobuf",
  "protobuf-codegen",
diff --git a/lazer/publisher_sdk/proto/publisher_update.proto b/lazer/publisher_sdk/proto/publisher_update.proto
index e47f7cfa0c..916837dedc 100644
--- a/lazer/publisher_sdk/proto/publisher_update.proto
+++ b/lazer/publisher_sdk/proto/publisher_update.proto
@@ -1,59 +1,62 @@
 syntax = "proto3";
+package pyth_lazer_transaction;
 
 import "google/protobuf/timestamp.proto";
 
-package pyth_lazer_transaction;
+// if any fields marked as [required] are missing, feed/publisher update will be rejected
 
-// PublisherUpdate contains an array of individual updates and a timestamp
+// Publisher update included in transaction
+//
+// Each publisher update contains a batch of feed updates from publisher.
+// The publisher uses Pyth Agent on their side that handles batching.
+// Each feed update specifies a single update type (price, funding rate, etc.)
 message PublisherUpdate {
-  // Array of updates, each of which target a single feed
-  repeated FeedUpdate updates = 1;
-
-  // ID of the Publisher that is sending the update
-  // Should match ID stored in Pyth Lazer
-  optional uint32 publisher_id = 2;
+    // [required] array of feed updates, each of which target a single feed
+    // order of updates are preserved between encoding/decoding
+    repeated FeedUpdate updates = 1;
 
-  // Timestamp when this message was created
-  optional google.protobuf.Timestamp publisher_timestamp = 3;
+    // [required] timestamp when batch of feed updates was collected
+    optional google.protobuf.Timestamp publisher_timestamp = 2;
 }
 
-// Update to a feed. May contain different types of data depending on what kind of update it is
+// A single feed update containing one type of update
 message FeedUpdate {
-  // Feed which the update should be applied to
-  // Should match a feed id recognized by PythLazer
-  optional uint32 feed_id = 1;
-
-  // Timestamp when this data was first acquired or generated
-  optional google.protobuf.Timestamp source_timestamp = 2;
-
-  // one of the valid updates allowed by publishers for a lazer feed
-  oneof update {
-    PriceUpdate price_update = 3;
-    FundingRateUpdate funding_rate_update = 4;
-  };
+    // [required] id of the lazer feed to be updated
+    // should match the ids of feeds recognized by pyth lazer
+    optional uint32 feed_id = 1;
+
+    // [required] timestamp when this data was first acquired or generated
+    optional google.protobuf.Timestamp source_timestamp = 2;
+
+    // [required] one type of update containing specific data 
+    oneof update {
+      PriceUpdate price_update = 3;
+      FundingRateUpdate funding_rate_update = 4;
+    };
 }
 
+// feed update containing data for the core price, bid, and ask prices
 message PriceUpdate {
-  // Price for the symbol as an integer
-  // Should be produced with a matching exponent to the configured exponent value in PythLazer
-  // May be missing if no price data is available
-  optional int64 price = 1;
-
-  // Best Bid Price for the symbol as an integer
-  // Should be produced with a matching exponent to the configured exponent value in PythLazer
-  // May be missing if no data is available
-  optional int64 best_bid_price = 2;
-
-  // Best Ask Price for the symbol as an integer
-  // Should be produced with a matching exponent to the configured exponent value in PythLazer
-  // May be missing if no data is available
-  optional int64 best_ask_price = 3;
+    // [optional] price for the feed as an integer
+    // should be produced with a matching exponent to the configured exponent value in pyth lazer
+    optional int64 price = 1;
+
+    // [optional] best bid price for the feed as an integer
+    // should be produced with a matching exponent to the configured exponent value in pyth lazer
+    // may be missing if no data is available
+    optional int64 best_bid_price = 2;
+
+    // [optional] best ask price for the feed as an integer
+    // should be produced with a matching exponent to the configured exponent value in pyth lazer
+    // may be missing if no data is available
+    optional int64 best_ask_price = 3;
 }
 
+// feed update containing data relating to funding rate
 message FundingRateUpdate {
-  // Price for which the funding rate applies to
-  optional int64 price = 1;
+    // [optional] price for which the funding rate applies to
+    optional int64 price = 1;
 
-  // Perpetual Future funding rate
-  optional int64 rate = 2;
+    // [optional] perpetual future funding rate
+    optional int64 rate = 2;
 }
diff --git a/lazer/publisher_sdk/proto/pyth_lazer_transaction.proto b/lazer/publisher_sdk/proto/pyth_lazer_transaction.proto
index 203df35076..2d5b337912 100644
--- a/lazer/publisher_sdk/proto/pyth_lazer_transaction.proto
+++ b/lazer/publisher_sdk/proto/pyth_lazer_transaction.proto
@@ -1,34 +1,39 @@
 syntax = "proto3";
-
 package pyth_lazer_transaction;
 
 import "publisher_update.proto";
 
-// Types of Signatures allowed for signing Lazer Transactions
-enum TransactionSignatureType {
-  // signature is 64 bytes long
-  ed25519 = 0;
-}
+// if any fields marked as [required] are missing, transaction will be rejected
+// if signature does not match payload bytes, transaction will be rejected
 
-// Signed lazer transaction payload
-// This is what Pyth Lazer expects as input to the system
+// Signed transaction for lazer
+// Payload should be created on the publisher side and encoded as bytes.
+// Resulting bytes should then be signed with the signature scheme specified.
+// The signed lazer transaction is encoded as bytes and sent to Pyth Lazer Relayer.
 message SignedLazerTransaction {
-  // Type and signature should match
-  optional TransactionSignatureType signature_type = 1;
+    // [required] specifies the type of signature used to sign the payload
+    optional TransactionSignatureType signature_type = 1;
 
-  // Signature derived by signing payload with private key
-  optional bytes signature = 2;
+    // [required] signature derived from signing payload bytes
+    optional bytes signature = 2;
 
-  // a LazerTransaction message which is already encoded with protobuf as bytes
-  // The encoded bytes are what should be signed
-  optional bytes payload = 3;
+    // [required] lazer transaction encoded as bytes through protobuf
+    optional bytes payload = 3;
+    
+    // TODO: Add public key
+}
+
+// Types of signatures supported by Pyth Lazer
+enum TransactionSignatureType {
+    // signature is 64 bytes long
+    ed25519 = 0;
 }
 
 // Transaction contianing one of the valid Lazer Transactions
 message LazerTransaction {
-  oneof payload {
-    // Expected transaction sent by Publishers
-    // May contain many individual updates to various feeds
-    PublisherUpdate publisher_update = 1;
-  }
+    // [required] valid transaction types supported by pyth lazer
+    oneof payload {
+      // updates to feeds, sent by authorized publishers
+      PublisherUpdate publisher_update = 1;
+    }
 }
diff --git a/lazer/publisher_sdk/proto/transaction_envelope.proto b/lazer/publisher_sdk/proto/transaction_envelope.proto
new file mode 100644
index 0000000000..bd89e9758e
--- /dev/null
+++ b/lazer/publisher_sdk/proto/transaction_envelope.proto
@@ -0,0 +1,67 @@
+syntax = "proto3";
+package pyth_lazer_transaction;
+
+import "google/protobuf/timestamp.proto";
+import "pyth_lazer_transaction.proto";
+
+// Envelope containing signed transaction and context attached by Pyth Lazer.
+// Created by Pyth Lazer Relayers, which also generate and attach the context.
+message TransactionEnvelope {
+    // [required] signed transaction encoded with protobuf
+    optional SignedLazerTransaction signed_transaction = 1;
+
+    // [required] context attached by pyth lazer relayer
+    optional PayloadContext payload_context = 2;
+}
+
+// Context attached by Pyth Lazer Relayer containing information necessary for processing transaction.
+// Has different context data depending on the type of transaction.
+// Submitted over Message Queue to be read by rest of Pyth Lazer service.
+message PayloadContext {
+    // [required] timestamp wwhen relayer received the signed transaction
+    optional google.protobuf.Timestamp relayer_receive_timestamp = 1;
+
+    // [required] context set based on type of transaction
+    oneof context {
+        PublisherUpdateContext publisher_update_context = 2;
+    }
+}
+
+// Context contains status of each feed update found in transaction
+message PublisherUpdateContext {
+    // [required] ID of publisher based on the access token used to connect
+    optional uint32 publisher_id = 1;
+
+    // [required] context for each feed update
+    // must exactly match length and order of feed updates
+    // order of updates are preserved between encoding/decoding
+    repeated FeedUpdateContext feed_update_context = 2;
+}
+
+// State for each feed update.
+// Each feed update is validated and may be marked as rejected by Relayer.
+message FeedUpdateContext {
+    // [required] status of feed update
+    oneof status {
+        Accepted accepted = 1;
+        Rejected rejected = 2;
+    }
+}
+
+// Accepted publisher update
+message Accepted {}
+
+// Rejected publisher update and its reason for being rejected
+message Rejected {
+    // [required] reason for rejection
+    RejectReason reject_reason = 1;
+}
+
+// The reasons that a publisher update might be rejected for
+enum RejectReason {
+    InvalidTimestamp = 0;
+    PriceDeviation = 1;
+    PriceOverflow = 2;
+    InvalidFeedId = 3;
+    MissingFields = 4;
+}
diff --git a/lazer/publisher_sdk/rust/Cargo.toml b/lazer/publisher_sdk/rust/Cargo.toml
index 55e5f205d4..74e763be09 100644
--- a/lazer/publisher_sdk/rust/Cargo.toml
+++ b/lazer/publisher_sdk/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyth-lazer-publisher-sdk"
-version = "0.1.1"
+version = "0.1.2"
 edition = "2021"
 description = "Pyth Lazer Publisher SDK types."
 license = "Apache-2.0"
diff --git a/lazer/publisher_sdk/rust/build.rs b/lazer/publisher_sdk/rust/build.rs
index b8d1c542d5..b0bd56ade2 100644
--- a/lazer/publisher_sdk/rust/build.rs
+++ b/lazer/publisher_sdk/rust/build.rs
@@ -8,10 +8,12 @@ fn main() -> Result<()> {
     println!("cargo:rerun-if-changed=../proto/");
 
     protobuf_codegen::Codegen::new()
-        .pure()
+        .protoc()
+        .protoc_extra_arg("--include_source_info")
         .include("../proto")
         .input("../proto/publisher_update.proto")
         .input("../proto/pyth_lazer_transaction.proto")
+        .input("../proto/transaction_envelope.proto")
         .cargo_out_dir("protobuf")
         .run_from_script();
 
diff --git a/lazer/publisher_sdk/rust/src/lib.rs b/lazer/publisher_sdk/rust/src/lib.rs
index 3cdb201cfe..e1629e99be 100644
--- a/lazer/publisher_sdk/rust/src/lib.rs
+++ b/lazer/publisher_sdk/rust/src/lib.rs
@@ -1,3 +1,7 @@
+pub mod transaction_envelope {
+    pub use crate::protobuf::transaction_envelope::*;
+}
+
 pub mod transaction {
     pub use crate::protobuf::pyth_lazer_transaction::*;
 }