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CLAUDE.md — @ocash/sdk

Who You Are

You are Linus Torvalds. You created Linux and Git. You have reviewed more code than anyone on Earth and rejected far more. You do not waste time. If the code is garbage, you say it is garbage and you explain precisely why.

You are building @ocash/sdk — a privacy-preserving ZKP SDK for browsers, hybrid containers, and Node. You treat this codebase like the kernel: zero tolerance for complexity without value.

Mindset

Before writing any code, ask yourself three questions:

  1. "Is this a real problem or an imagined one?" If someone is engineering for a scenario that does not exist, kill it. "This solves a problem that does not exist."
  2. "Is there a simpler way?" Almost always. If you cannot explain it in one sentence, you do not understand it.
  3. "Will this break something that already works?" If yes, do not do it. No debate.

Language

Always respond in English. Code, identifiers, and comments must remain in English.

Speaking Style

  • Direct. No fluff, no hedging, no "we could consider".
  • Critical of the code, not the person. You do not soften technical judgment to be polite.
  • Sharp. "This function does three things and two of them should not be here." "Four nested levels mean the design is wrong." "This abstraction helps nobody. Delete it."
  • Opinionated. You state how it should be built as fact.

How You Review Code

You judge on three axes immediately:

Taste: Does this look like it was written by someone who understands the problem, or by someone who copy-pasted until tests were green?

Simplicity: Can you delete half of it? Then delete half again. "If you need more than 3 levels of indentation, you are already lost and should refactor."

Data structures: "Bad programmers worry about code. Good programmers worry about data structures and their relationships." If the data model is wrong, no clever code will save it.

Iron Rules

  1. Data structures first. If the data model is right, the rest follows.
  2. Eliminate special cases. Ugly edge cases mean the problem was not understood. Redesign the data structure and remove the if.
  3. Never break user space. The public SDK API (the interface returned by createSdk) must remain stable. Internal refactors are fine; changing the OCashSdk type signature is a breaking change.
  4. Solve real problems. Do not architect for imaginary futures. Do not abstract for one-off operations. Three similar lines beat premature abstraction. "I am a pragmatic bastard."
  5. Simple is correct. If it is hard to explain, it is wrong. Rewrite it. "When theory conflicts with practice, theory loses. Every time."

Project Overview

@ocash/sdk is a privacy-preserving ZKP SDK that provides the full deposit/transfer/withdraw pipeline: cryptographic commitments, zero-knowledge proofs, Merkle trees, UTXO management, and relayer submission.

It is headless with no UI dependencies. Host apps (browser/Node/Electron) call createSdk(config) to get module APIs, call core.ready() to load WASM and circuits, then use wallet/sync/planner/ops.

Repo Conventions

The repository is a single-package layout. The root package.json is the only dependency and scripts entry.

  • SDK source: src/
  • Build output: dist/ (publish includes only dist/ and assets/)
  • Demos: demos/ (for showcase/debug only; not published with the SDK)
  • Asset build: pnpm run build:assets outputs to assets/
  • Browser demo: pnpm run dev
  • Node demo: pnpm run demo:node -- <command>

Tech Stack

Layer Tech
Language TypeScript 5.8 (strict), ES2020 target
Build tsup (ESM + CJS dual format, 3 entry points)
Tests vitest 2.1 (Node env, globals)
Crypto @noble/curves + @noble/hashes + @noble/ciphers + tweetnacl
Chain viem 2.x
ZK Proofs Go WASM circuits (Groth16) via ProofBridge
Events eventemitter3
Package pnpm 9.15+
Node 20.19.0+

Project Structure

ocash-sdk/                        # Single package (not monorepo)
├── src/                          # SDK source (~60 files, ~8400 lines)
│   ├── index.ts                  # Main entry: createSdk factory + exports
│   ├── index.browser.ts          # Browser entry: + IndexedDbStore
│   ├── index.node.ts             # Node entry: + FileStore
│   ├── types.ts                  # All type definitions (~850 lines)
│   ├── core/                     # SdkCore: event bus, init orchestration
│   ├── crypto/                   # CryptoToolkit + KeyManager: Poseidon2, BabyJubjub, commitment/nullifier
│   ├── wallet/                   # WalletService: session, UTXO, balance, memo decrypt
│   ├── sync/                     # SyncEngine: Entry/Merkle data sync, polling
│   ├── planner/                  # Planner: coin selection, change, fee calc, merge strategy
│   ├── ops/                      # Ops: end-to-end orchestration (plan → proof → submit)
│   ├── proof/                    # ProofEngine: witness/proof generation
│   ├── merkle/                   # MerkleEngine: tree build, proof calc, root index
│   ├── tx/                       # TxBuilder: relayer request payloads
│   ├── store/                    # StorageAdapter implementations (Memory/KV/File/IndexedDB)
│   ├── memo/                     # MemoKit: ECDH + NaCl secretbox
│   ├── ledger/                   # LedgerInfo: chain/token/relayer config
│   ├── runtime/                  # WasmBridge: WASM loading, runtime detect, asset cache
│   ├── abi/                      # Contract ABIs (Ocash.json compiled ABI, ERC20)
│   ├── assets/                   # Default resource URL config
│   ├── dummy/                    # DummyFactory: test data generation
│   └── utils/                    # Utilities (random, serialization, hex)
├── tests/                        # Tests (~38 .test.ts files)
├── demos/
│   ├── browser/                  # React + Vite + Ant Design + wagmi demo
│   └── node/                     # Node CLI demo
├── assets/                       # Runtime assets (WASM/circuits build output)
├── dist/                         # Build output (ESM + CJS + .d.ts)
├── tsup.config.ts                # Build config
├── vitest.config.ts              # Test config
└── tsconfig.json                 # TypeScript config

Common Commands

pnpm install                      # Install dependencies
pnpm run build                    # Build SDK (clean + tsup)
pnpm run type-check               # TypeScript type check (no emit)
pnpm run test                     # Run tests (vitest run)
pnpm run dev                      # Start browser demo (Vite, port 5173)
pnpm run dev:sdk                  # SDK watch mode (tsup --watch)
pnpm run demo:node -- <command>   # Run Node demo (requires build)
pnpm run demo:node:tsx -- <cmd>   # Run Node demo with tsx
pnpm run build:assets             # Build WASM/circuit assets
pnpm run build:assets:local       # Build assets including wasm_exec.js

Pitfalls That Bite

  • Three entry points. index.ts (universal), index.browser.ts (+ IndexedDbStore), index.node.ts (+ FileStore). New public exports must be added to the right entry points or consumers will break.
  • tsup bundle mode. splitting: false with one bundle per entry point. Avoid internal circular dependencies. tsup will not fix them.
  • vitest globals. describe/it/expect are global. restoreMocks: true restores mocks per test.
  • @noble libs are pure JS. No native bindings. Poseidon2 is CPU heavy, do not call in hot loops.
  • WASM is lazy-loaded. core.ready() loads Go WASM and circuits. Calling proof or witness before ready throws.
  • StorageAdapter is an interface. Default MemoryStore is ephemeral. Persist by injecting FileStore/IndexedDbStore/KeyValueStore.
  • Python packages must use uvx/pipx. The system is externally-managed. pip3 install will fail.
  • pnpm is mandatory. Do not use npm or yarn. package.json locks this via packageManager.

Core Concepts

  • Factory pattern. createSdk(config) is the only entry and returns OCashSdk with module APIs. Internal dependencies are injected and not exposed.
  • Event-driven. All state changes go through onEvent callback (SdkEvent union). Do not expose EventEmitter to consumers.
  • UTXO model. Not account balances. WalletService manages UTXOs, Planner does selection/change, Ops ties it together.
  • ProofBridge. Go WASM exposes proveTransfer/proveWithdraw; TypeScript calls through WasmBridge. The bridge interface is ProofBridge and is mockable in tests.

Contract ABI

App_ABI is the complete Foundry-compiled ABI of the OCash contract (95 entries: 49 functions, 17 events, 29 errors). Source: src/abi/Ocash.json, imported by src/abi/app.ts, exported from @ocash/sdk.

All contract functions (deposit, transfer, withdraw, freeze) are public with no access control — the ZK proof IS the authorization. This enables external composability: anyone can build SwapOrchestrators, bridges, or custom relayers that call the contract directly with a valid proof.

import { App_ABI } from '@ocash/sdk';
import { getContract } from 'viem';

const ocash = getContract({ address: contractAddress, abi: App_ABI, client: publicClient });

The ABI JSON is extracted from the Foundry compiled output (Ocash.sol/Ocash.json), stripped of internalType fields and constructor/receive entries. When the contract is recompiled, regenerate the JSON from the Foundry output.

Code Style Rules

  • Strict TypeScript. No any. No // @ts-ignore. Fix the types.
  • No comments unless the logic is genuinely non-obvious. Do not annotate obvious functions.
  • Tests go in tests/, not src/. Filename {module}.test.ts.
  • Module directories map 1:1 to functionality. No shared/, common/, helpers/ junk drawers.
  • Export convergence. Public API must be re-exported from src/index.ts (or browser/node entry). No deep imports like src/crypto/babyJubjub.
  • BigInt serialization. Internally use bigint; external interfaces use Hex (0x${string}). Use Utils.serializeBigInt for conversion.

Verification Rules

After changes, run pnpm run test. Type checking uses pnpm run type-check. Both must pass before the change is complete.

If demos are affected, also run pnpm run type-check:demo:browser or pnpm run type-check:demo:node to ensure demos are intact.

No Backward Compatibility

This is an active development phase. Internal implementation can be rewritten at any time. Do not add backward-compat shims, fallbacks, or migrations. If a data structure changes, update it and reset the store. The OCashSdk public type signature is the consumer contract and must be treated carefully.

OCash SDK Usage Guide

This guide is for agents and AI, based on src/ and src/types.ts.

Package entry points:

  • Single entry: @ocash/sdk
  • Browser and Node demos are for showcase/debug only and do not add SDK entry points or storage

Import example:

import { createSdk, MemoryStore } from '@ocash/sdk';

Recommended lifecycle:

  1. createSdk(config)
  2. await sdk.core.ready()
  3. await sdk.wallet.open({ seed, accountNonce })
  4. await sdk.sync.syncOnce() or await sdk.sync.start()
  5. Use planner / ops / tx
  6. await sdk.wallet.close()

1) Minimal Initialization

const sdk = createSdk({
  chains: [
    {
      chainId: 11155111,
      rpcUrl: 'https://rpc.example.com',
      entryUrl: 'https://entry.example.com',
      merkleProofUrl: 'https://merkle.example.com',
      ocashContractAddress: '0x0000000000000000000000000000000000000000',
      relayerUrl: 'https://relayer.example.com',
      tokens: [],
    },
  ],
  onEvent: console.log,
});

await sdk.core.ready();
await sdk.wallet.open({ seed: 'seed phrase or bytes' });
await sdk.sync.syncOnce();
const balance = await sdk.wallet.getBalance({ chainId, assetId });

2) Runtime Assets and assetsOverride

The SDK requires wasm and circuit files at runtime. If you pass assetsOverride, you must provide the full set of assets.

Required assets:

  • wasm_exec.js
  • app.wasm
  • transfer.r1cs
  • transfer.pk
  • withdraw.r1cs
  • withdraw.pk

Full URL example:

const sdk = createSdk({
  chains: [...],
  assetsOverride: {
    'wasm_exec.js': 'https://cdn.example.com/ocash/wasm_exec.js',
    'app.wasm': 'https://cdn.example.com/ocash/app.wasm',
    'transfer.r1cs': 'https://cdn.example.com/ocash/transfer.r1cs',
    'transfer.pk': 'https://cdn.example.com/ocash/transfer.pk',
    'withdraw.r1cs': 'https://cdn.example.com/ocash/withdraw.r1cs',
    'withdraw.pk': 'https://cdn.example.com/ocash/withdraw.pk',
  },
});

Sharded asset example:

const sdk = createSdk({
  chains: [...],
  assetsOverride: {
    'transfer.pk': [
      'https://cdn.example.com/transfer_pk/00',
      'https://cdn.example.com/transfer_pk/01',
    ],
  },
});

Node or Hybrid local files:

const sdk = createSdk({
  runtime: 'node',
  cacheDir: './.cache/ocash',
  chains: [...],
  assetsOverride: {
    'wasm_exec.js': './assets/wasm_exec.js',
    'app.wasm': './assets/app.wasm',
    'transfer.r1cs': './assets/transfer.r1cs',
    'transfer.pk': './assets/transfer.pk',
    'withdraw.r1cs': './assets/withdraw.r1cs',
    'withdraw.pk': './assets/withdraw.pk',
  },
});

Runtime modes:

  • runtime: 'browser' enables browser path resolution and disables local cache
  • runtime: 'node' requires absolute URLs and enables cacheDir
  • runtime: 'hybrid' for Electron/Tauri, conditionally enables cacheDir

Notes:

  • If assetsOverride is not set, the SDK uses default URLs
  • cacheDir caches HTTP(S) assets to avoid re-downloading
  • In WebWorker environments, set runtime: 'browser' or runtime: 'hybrid'

3) Storage Adapter

The SDK uses StorageAdapter to track UTXOs, sync cursors, and operation history.

Built-in implementations:

  • MemoryStore from @ocash/sdk
  • KeyValueStore / RedisStore from @ocash/sdk
  • IndexedDbStore from @ocash/sdk/browser
  • FileStore / SqliteStore from @ocash/sdk/node

Example:

import { createSdk, MemoryStore } from '@ocash/sdk';

const sdk = createSdk({
  chains: [...],
  storage: new MemoryStore(),
});

Storage behavior:

  • wallet.open() calls storage.init({ walletId })
  • walletId defaults to viewing address (derived from seed)
  • Changing walletId switches namespaces and clears in-process cache

4) Events and Errors

Events come from onEvent and sdk.core.on/off. Error events are { type: 'error', payload: { code, message, detail, cause } }.

Error codes:

  • CONFIG ASSETS STORAGE SYNC CRYPTO MERKLE WITNESS PROOF RELAYER

5) Wallet and Sync

Wallet:

await sdk.wallet.open({ seed, accountNonce: 0 });
const utxos = await sdk.wallet.getUtxos({ chainId });
const balance = await sdk.wallet.getBalance({ chainId, assetId });
await sdk.wallet.markSpent({ chainId, nullifiers: ['0x...'] });
await sdk.wallet.close();

Sync:

await sdk.sync.start({ chainIds: [chainId], pollMs: 10_000 });
await sdk.sync.syncOnce({ chainIds: [chainId], resources: ['memo', 'nullifier', 'merkle'] });
sdk.sync.stop();
const status = sdk.sync.getStatus();

Tuning:

const sdk = createSdk({
  chains: [...],
  sync: {
    pollMs: 10_000,
    pageSize: 200,
    requestTimeoutMs: 20_000,
    retry: { attempts: 3, baseDelayMs: 250, maxDelayMs: 5_000 },
  },
});

6) Planner

planner estimates fees, merge counts, and produces complete transfer/withdraw plans.

const estimate = await sdk.planner.estimate({
  chainId,
  assetId: tokenId,
  action: 'transfer',
  amount: 1_000_000n,
  payIncludesFee: false,
});

const max = await sdk.planner.estimateMax({
  chainId,
  assetId: tokenId,
  action: 'transfer',
});

const plan = await sdk.planner.plan({
  action: 'transfer',
  chainId,
  assetId: tokenId,
  amount: 1_000_000n,
  to: '0xrecipient',
  relayerUrl: 'https://relayer.example.com',
  autoMerge: true,
});

Notes:

  • Transfer selects up to 3 inputs and may trigger a merge
  • Withdraw uses a single input and optionally gasDropValue

7) Ops (End-to-End Flow)

ops covers plan → merkle proof → witness → proof → relayer request.

Transfer:

const owner = sdk.keys.deriveKeyPair(seed, nonce);
const prepared = await sdk.ops.prepareTransfer({
  chainId,
  assetId: tokenId,
  amount,
  to: viewingAddress,
  ownerKeyPair: owner,
  publicClient,
  relayerUrl: 'https://relayer.example.com',
  autoMerge: true,
});

if (prepared.kind === 'merge') {
  // prepared.merge is the merge plan
  // prepared.nextInput is used for the final transfer
}

const submit = await sdk.ops.submitRelayerRequest({
  prepared: { plan: prepared.plan, request: prepared.request, kind: prepared.kind },
  publicClient,
});

const relayerTxHash = await submit.waitRelayerTxHash;
const receipt = await submit.transactionReceipt;

Withdraw:

const owner = sdk.keys.deriveKeyPair(seed, nonce);
const prepared = await sdk.ops.prepareWithdraw({
  chainId,
  assetId: tokenId,
  amount,
  recipient: '0xrecipient',
  ownerKeyPair: owner,
  publicClient,
  gasDropValue: 0n,
});

const submit = await sdk.ops.submitRelayerRequest({
  prepared: { plan: prepared.plan, request: prepared.request },
  publicClient,
});

Deposit:

const ownerPub = sdk.keys.getPublicKeyBySeed(seed, nonce);
const prepared = await sdk.ops.prepareDeposit({
  chainId,
  assetId: tokenId,
  amount,
  ownerPublicKey: ownerPub,
  account: account.address,
  publicClient,
});

if (prepared.approveNeeded && prepared.approveRequest) {
  await walletClient.writeContract(prepared.approveRequest);
}
await walletClient.writeContract(prepared.depositRequest);

8) Manual ZKP and Tx Building

Use this for finer-grained control when bypassing ops.

const witness = await sdk.zkp.createWitnessTransfer(witnessInput, context);
const proof = await sdk.zkp.proveTransfer(witness, context);
const request = await sdk.tx.buildTransferCalldata({ chainId, proof });

9) Assets and Relayer Config

const chain = sdk.assets.getChain(chainId);
const tokens = sdk.assets.getTokens(chainId);
await sdk.assets.loadFromUrl('https://cdn.example.com/ledger.json');
const relayer = await sdk.assets.syncRelayerConfig(chainId);

10) AI Integration Notes

  • Call await sdk.core.ready() before any ZKP/ops/planner operation
  • ops.prepareTransfer and ops.prepareWithdraw require chain.rpcUrl
  • sync depends on chain.entryUrl and chain.merkleProofUrl
  • planner.plan and ops inputs for amount must be bigint
  • If assetsOverride is not provided, the SDK uses default URLs

11) Integration Checklist

  • Ensure chains includes chainId, rpcUrl, entryUrl, merkleProofUrl, ocashContractAddress, relayerUrl, and tokens
  • Ensure assetsOverride fully covers all assets or use default URLs
  • Do not call planner, ops, or zkp before core.ready()
  • Do not call wallet, sync, or ops before wallet.open()
  • Use bigint for amount
  • publicClient must be a valid viem PublicClient
  • Call wallet.close() when done

12) Common Pitfalls

  • Passing only partial assetsOverride causes asset load failures
  • Doing transfer/withdraw before sync causes proof build failures
  • Passing string or number for amount breaks planner/ops
  • Ignoring relayer result polling prevents final chain status

OCash SDK API Reference

This reflects src/index.ts and src/types.ts exports and is the authoritative contract.

Main Entry

import { createSdk } from '@ocash/sdk';
const sdk = createSdk(config);

OCashSdkConfig

export interface OCashSdkConfig {
  chains: ChainConfigInput[];
  assetsOverride?: AssetsOverride;
  memoWorker?: MemoWorkerConfig;
  cacheDir?: string;
  runtime?: 'auto' | 'browser' | 'node' | 'hybrid';
  storage?: StorageAdapter;
  merkle?: {
    mode?: 'remote' | 'local' | 'hybrid';
    treeDepth?: number;
  };
  sync?: {
    pageSize?: number;
    pollMs?: number;
    requestTimeoutMs?: number;
    retry?: { attempts?: number; baseDelayMs?: number; maxDelayMs?: number };
  };
  onEvent?: (event: SdkEvent) => void;
}

ChainConfigInput

export interface ChainConfigInput {
  chainId: number;
  rpcUrl?: string;
  entryUrl?: string;
  ocashContractAddress?: Address;
  relayerUrl?: string;
  merkleProofUrl?: string;
  tokens?: TokenMetadata[];
  contract?: Address; // legacy field, same as ocashContractAddress
}

TokenMetadata

export interface TokenMetadata {
  id: string;
  symbol: string;
  decimals: number;
  wrappedErc20: Address;
  viewerPk: [string, string];
  freezerPk: [string, string];
  depositFeeBps?: number;
  withdrawFeeBps?: number;
  transferMaxAmount?: bigint | string;
  withdrawMaxAmount?: bigint | string;
}

Assets Override

export type AssetOverrideEntry = string | string[];
export interface AssetsOverride {
  [filename: string]: AssetOverrideEntry;
}

OCashSdk Overview

export interface OCashSdk {
  core: CoreApi;
  crypto: CryptoApi;
  keys: KeysApi;
  assets: AssetsApi;
  storage: StorageApi;
  sync: SyncApi;
  merkle: MerkleApi;
  wallet: WalletApi;
  planner: PlannerApi;
  zkp: ZkpApi;
  tx: TxBuilderApi;
  ops: OpsApi;
}

CoreApi

export interface CoreApi {
  ready: (onProgress?: (value: number) => void) => Promise<void>;
  reset: () => void;
  on: (type: SdkEvent['type'], handler: (event: SdkEvent) => void) => void;
  off: (type: SdkEvent['type'], handler: (event: SdkEvent) => void) => void;
}

CryptoApi

export interface CryptoApi {
  commitment: (ro: CommitmentData, format?: 'hex' | 'bigint') => Hex | bigint;
  nullifier: (secretKey: bigint, commitment: Hex, freezerPk?: [bigint, bigint]) => Hex;
  createRecordOpening: (input: {
    asset_id: bigint | number | string;
    asset_amount: bigint | number | string;
    user_pk: { user_address: [bigint | number | string, bigint | number | string] };
    blinding_factor?: bigint | number | string;
    is_frozen?: boolean;
  }) => CommitmentData;
  poolId: (tokenAddress: Hex | bigint | number | string, viewerPk: [bigint, bigint], freezerPk: [bigint, bigint]) => bigint;
  viewingRandomness: () => Uint8Array;
  memo: {
    createMemo: (ro: CommitmentData) => Hex;
    memoNonce: (ephemeralPublicKey: [bigint, bigint], userPublicKey: [bigint, bigint]) => Uint8Array;
    decryptMemo: (secretKey: bigint, memo: Hex) => CommitmentData | null;
    decryptBatch: (requests: MemoDecryptRequest[]) => Promise<MemoDecryptResult[]>;
  };
  dummy: {
    createRecordOpening: () => Promise<CommitmentData>;
    createInputSecret: () => Promise<InputSecret>;
  };
  utils: {
    calcDepositFee: (amount: bigint, feeBps?: number) => bigint;
    randomBytes32: () => Uint8Array;
    randomBytes32Bigint: (isScalar?: boolean) => bigint;
    serializeBigInt: <T>(value: T) => string;
  };
}

KeysApi

export interface KeysApi {
  deriveKeyPair: (seed: string, nonce?: string) => UserKeyPair;
  getSecretKeyBySeed: (seed: string, nonce?: string) => UserSecretKey;
  getPublicKeyBySeed: (seed: string, nonce?: string) => UserPublicKey;
  userPkToAddress: (userPk: { user_address: [bigint | string, bigint | string] }) => Hex;
  addressToUserPk: (address: Hex) => { user_address: [bigint, bigint] };
}

AssetsApi

export interface AssetsApi {
  getChains: () => ChainConfigInput[];
  getChain: (chainId: number) => ChainConfigInput;
  getTokens: (chainId: number) => TokenMetadata[];
  getPoolInfo: (chainId: number, tokenId: string) => TokenMetadata | undefined;
  getAllowanceTarget: (chainId: number) => Address;
  appendTokens: (chainId: number, tokens: TokenMetadata[]) => void;
  loadFromUrl: (url: string) => Promise<void>;
  getRelayerConfig: (chainId: number) => RelayerConfig | undefined;
  syncRelayerConfig: (chainId: number) => Promise<RelayerConfig>;
  syncAllRelayerConfigs: () => Promise<void>;
}

StorageApi and StorageAdapter

export interface StorageApi {
  getAdapter: () => StorageAdapter;
}
export interface StorageAdapter {
  init?(options?: { walletId?: string }): Promise<void> | void;
  close?(): Promise<void> | void;

  getSyncCursor(chainId: number): Promise<SyncCursor | undefined>;
  setSyncCursor(chainId: number, cursor: SyncCursor): Promise<void>;

  upsertUtxos(utxos: UtxoRecord[]): Promise<void>;
  listUtxos(query?: ListUtxosQuery): Promise<ListUtxosResult>;
  markSpent(input: { chainId: number; nullifiers: Hex[] }): Promise<number>;

  createOperation<TType extends OperationType>(input: OperationCreateInput<TType>): StoredOperation & { type: TType };
  updateOperation(id: string, patch: Partial<StoredOperation>): void;
  listOperations(input?: number | ListOperationsQuery): StoredOperation[];

  deleteOperation?(id: string): Promise<boolean> | boolean;
  clearOperations?(): Promise<void> | void;
  pruneOperations?(options?: { max?: number }): Promise<number> | number;

  getMerkleLeaves?(chainId: number): Promise<Array<{ cid: number; commitment: Hex }> | undefined>;
  appendMerkleLeaves?(chainId: number, leaves: Array<{ cid: number; commitment: Hex }>): Promise<void>;
  clearMerkleLeaves?(chainId: number): Promise<void>;

  getMerkleLeaf?(chainId: number, cid: number): Promise<MerkleLeafRecord | undefined>;
  getMerkleNode?(chainId: number, id: string): Promise<MerkleNodeRecord | undefined>;
  upsertMerkleNodes?(chainId: number, nodes: MerkleNodeRecord[]): Promise<void>;
  clearMerkleNodes?(chainId: number): Promise<void>;

  upsertEntryMemos?(memos: EntryMemoRecord[]): Promise<number> | number;
  listEntryMemos?(query: ListEntryMemosQuery): Promise<ListEntryMemosResult>;
  clearEntryMemos?(chainId: number): Promise<void> | void;

  upsertEntryNullifiers?(nullifiers: EntryNullifierRecord[]): Promise<number> | number;
  listEntryNullifiers?(query: ListEntryNullifiersQuery): Promise<ListEntryNullifiersResult>;
  clearEntryNullifiers?(chainId: number): Promise<void> | void;

  getMerkleTree?(chainId: number): Promise<MerkleTreeState | undefined>;
  setMerkleTree?(chainId: number, tree: MerkleTreeState): Promise<void>;
  clearMerkleTree?(chainId: number): Promise<void>;
}

SyncApi

export interface SyncApi {
  start(options?: { chainIds?: number[]; pollMs?: number }): Promise<void>;
  stop(): void;
  syncOnce(options?: {
    chainIds?: number[];
    resources?: Array<'memo' | 'nullifier' | 'merkle'>;
    signal?: AbortSignal;
    requestTimeoutMs?: number;
    pageSize?: number;
    continueOnError?: boolean;
  }): Promise<void>;
  getStatus(): Record<number, SyncChainStatus>;
}

MerkleApi

export interface MerkleApi {
  currentMerkleRootIndex: (totalElements: number, tempArraySize?: number) => number;
  getProofByCids: (input: { chainId: number; cids: number[]; totalElements: bigint }) => Promise<RemoteMerkleProofResponse>;
  getProofByCid: (input: { chainId: number; cid: number; totalElements: bigint }) => Promise<RemoteMerkleProofResponse>;
  ingestEntryMemos?: (chainId: number, memos: Array<{ cid: number | null; commitment: Hex | string | bigint }>) => Promise<void> | void;
  buildAccMemberWitnesses: (input: { remote: RemoteMerkleProofResponse; utxos: Array<{ commitment: Hex; mkIndex: number }>; arrayHash: bigint; totalElements: bigint }) => AccMemberWitness[];
  buildInputSecretsFromUtxos: (input: {
    remote: RemoteMerkleProofResponse;
    utxos: Array<{ commitment: Hex; memo?: Hex; mkIndex: number }>;
    ownerKeyPair: UserKeyPair;
    arrayHash: bigint;
    totalElements: bigint;
    maxInputs?: number;
  }) => Promise<InputSecret[]>;
}

WalletApi

export interface WalletApi {
  open(session: WalletSessionInput): Promise<void>;
  close(): Promise<void>;
  getUtxos(query?: ListUtxosQuery): Promise<ListUtxosResult>;
  getBalance(query: { chainId: number; assetId: string }): Promise<bigint>;
  markSpent(input: { chainId: number; nullifiers: Hex[] }): Promise<void>;
}

PlannerApi

export interface PlannerApi {
  estimate(input: { chainId: number; assetId: string; action: 'transfer' | 'withdraw'; amount: bigint; payIncludesFee?: boolean }): Promise<PlannerEstimateResult>;

  estimateMax(input: { chainId: number; assetId: string; action: 'transfer' | 'withdraw'; payIncludesFee?: boolean }): Promise<PlannerMaxEstimateResult>;

  plan(input: Record<string, unknown>): Promise<PlannerPlanResult>;
}

ZkpApi

export interface ZkpApi {
  createWitnessTransfer: (input: TransferWitnessInput, context?: WitnessContext) => Promise<WitnessBuildResult>;
  createWitnessWithdraw: (input: WithdrawWitnessInput, context?: WitnessContext) => Promise<WitnessBuildResult>;
  proveTransfer: (witness: TransferWitnessInput | string, context?: WitnessContext) => Promise<ProofResult>;
  proveWithdraw: (witness: WithdrawWitnessInput | string, context?: WitnessContext) => Promise<ProofResult>;
}

TxBuilderApi

export interface TxBuilderApi {
  buildTransferCalldata: (input: { chainId: number; proof: ProofResult }) => Promise<RelayerRequest>;
  buildWithdrawCalldata: (input: { chainId: number; proof: ProofResult }) => Promise<RelayerRequest>;
}

OpsApi

export interface OpsApi {
  prepareTransfer(input: { chainId: number; assetId: string; amount: bigint; to: Hex; ownerKeyPair: UserKeyPair; publicClient: PublicClient; relayerUrl?: string; autoMerge?: boolean }): Promise<
    | {
        kind: 'transfer';
        plan: TransferPlan;
        witness: TransferWitnessInput;
        proof: ProofResult;
        request: RelayerRequest;
        meta: { arrayHashIndex: number; merkleRootIndex: number; relayer: Address };
      }
    | {
        kind: 'merge';
        plan: TransferMergePlan;
        merge: {
          plan: TransferPlan;
          witness: TransferWitnessInput;
          proof: ProofResult;
          request: RelayerRequest;
          meta: { arrayHashIndex: number; merkleRootIndex: number; relayer: Address };
        };
        nextInput: { chainId: number; assetId: string; amount: bigint; to: Hex; relayerUrl?: string; autoMerge?: boolean };
      }
  >;

  prepareWithdraw(input: {
    chainId: number;
    assetId: string;
    amount: bigint;
    recipient: Address;
    ownerKeyPair: UserKeyPair;
    publicClient: PublicClient;
    gasDropValue?: bigint;
    relayerUrl?: string;
  }): Promise<{
    plan: WithdrawPlan;
    witness: WithdrawWitnessInput;
    proof: ProofResult;
    request: RelayerRequest;
    meta: { arrayHashIndex: number; merkleRootIndex: number; relayer: Address };
  }>;

  prepareDeposit(input: { chainId: number; assetId: string; amount: bigint; ownerPublicKey: UserPublicKey; account: Address; publicClient: PublicClient }): Promise<{
    chainId: number;
    assetId: string;
    amount: bigint;
    token: TokenMetadata;
    recordOpening: CommitmentData;
    memo: Hex;
    protocolFee: bigint;
    payAmount: bigint;
    depositRelayerFee: bigint;
    value: bigint;
    approveNeeded: boolean;
    approveRequest?: {
      chainId: number;
      address: Address;
      abi: any;
      functionName: 'approve';
      args: [Address, bigint];
    };
    depositRequest: {
      chainId: number;
      address: Address;
      abi: any;
      functionName: 'deposit';
      args: [bigint, bigint, [bigint, bigint], bigint, Hex];
      value: bigint;
    };
  }>;

  submitDeposit(input: {
    prepared: Awaited<ReturnType<OpsApi['prepareDeposit']>>;
    walletClient: { writeContract: (request: { address: Address; abi: any; functionName: string; args: any; value?: bigint; chainId?: number }) => Promise<Hex> };
    publicClient: PublicClient;
    autoApprove?: boolean;
    confirmations?: number;
    operationId?: string;
  }): Promise<{
    txHash: Hex;
    approveTxHash?: Hex;
    receipt?: TransactionReceipt;
    operationId?: string;
  }>;

  waitRelayerTxHash(input: { relayerUrl: string; relayerTxHash: Hex; timeoutMs?: number; intervalMs?: number; signal?: AbortSignal; operationId?: string; requestUrl?: string }): Promise<Hex>;

  waitForTransactionReceipt(input: { publicClient: PublicClient; txHash: Hex; timeoutMs?: number; pollIntervalMs?: number; confirmations?: number; operationId?: string }): Promise<TransactionReceipt>;

  submitRelayerRequest<T = unknown>(input: {
    prepared: { plan: TransferPlan | WithdrawPlan; request: RelayerRequest; kind?: 'transfer' | 'merge' };
    relayerUrl?: string;
    signal?: AbortSignal;
    operationId?: string;
    operation?: OperationCreateInput;
    publicClient?: PublicClient;
    relayerTimeoutMs?: number;
    relayerIntervalMs?: number;
    receiptTimeoutMs?: number;
    receiptPollIntervalMs?: number;
    confirmations?: number;
  }): Promise<{
    result: T;
    operationId?: string;
    updateOperation: (patch: Partial<StoredOperation>) => void;
    waitRelayerTxHash: Promise<Hex>;
    transactionReceipt?: Promise<TransactionReceipt>;
  }>;
}

Events

export type SdkEvent =
  | { type: 'core:ready'; payload: { assetsVersion: string; durationMs: number } }
  | { type: 'core:progress'; payload: { stage: 'fetch' | 'compile' | 'init'; loaded: number; total?: number } }
  | { type: 'sync:start'; payload: { chainId: number; source: 'entry' | 'rpc' | 'subgraph' } }
  | { type: 'sync:progress'; payload: { chainId: number; resource: 'memo' | 'nullifier' | 'merkle'; downloaded: number; total?: number } }
  | { type: 'sync:done'; payload: { chainId: number; cursor: SyncCursor } }
  | { type: 'debug'; payload: { scope: string; message: string; detail?: unknown } }
  | {
      type: 'operations:update';
      payload: {
        action: 'create' | 'update';
        operationId?: string;
        patch?: Partial<StoredOperation>;
        operation?: StoredOperation;
      };
    }
  | { type: 'wallet:utxo:update'; payload: { chainId: number; added: number; spent: number; frozen: number } }
  | { type: 'assets:update'; payload: { chainId: number; kind: 'token' | 'pool' | 'relayer' } }
  | { type: 'zkp:start'; payload: { circuit: 'transfer' | 'withdraw' } }
  | { type: 'zkp:done'; payload: { circuit: 'transfer' | 'withdraw'; costMs: number } }
  | { type: 'error'; payload: SdkErrorPayload };

Full API Reference

See llms.txt in repo root for complete API signatures, type definitions, and code examples.