Deposit and Withdraw

// crypto.ts - generateSecrets()
const secret = BigInt(
  '0x' + crypto.getRandomValues(new Uint8Array(32))
    .reduce((hex, byte) => hex + byte.toString(16).padStart(2, '0'), '')
);

const nullifier = BigInt(/* same pattern */);

// API route: /api/poseidon
const poseidon = await buildPoseidon();
const commitment = poseidon.F.toString(
  poseidon([secret, nullifier])
);

// Returns: "0x1a2b3c..." (32-byte hex string)

// Transaction 1: Approve wETH spending
await wethContract.approve(poolController.address, amount);

// Transaction 2: Deposit with commitment
await poolController.deposit(commitment, amount);

// Emits: Deposit(commitment, amount, index)

// Deposit note structure
interface DepositNote {
  secret: string;       // Hex-encoded BigInt
  nullifier: string;    // Hex-encoded BigInt
  commitment: string;   // Poseidon hash
  amount: string;       // In wei
  timestamp: number;    // Unix timestamp
  _encryptedBy?: string; // Wallet address
}

// Proof generation with snarkjs
const { proof, publicSignals } = await snarkjs.groth16.fullProve(
  {
    secret: note.secret,
    nullifier: note.nullifier,
    commitment: note.commitment,
    nullifierHash: computeNullifierHash(note.nullifier),
    recipient: recipientAddress,
    amount: note.amount,
  },
  '/circuits/withdraw_js/withdraw.wasm',
  '/circuits/keys/withdraw_final.zkey'
);

// Format proof for Solidity
const proofBytes = ethers.utils.defaultAbiCoder.encode(
  ['uint256[2]', 'uint256[2][2]', 'uint256[2]'],
  [proof.pi_a, proof.pi_b, proof.pi_c]
);

// Call withdraw
await poolController.withdraw(
  nullifierHash,
  recipientAddress,
  amount,
  proofBytes
);