This library contains methods required to construct AZTEC zero-knowledge proofs, and to create the required EIP712 signatures in order to spend AZTEC notes.
IMPORTANT: The deployed AZTEC smart contracts use a trusted setup created by AZTEC in-house and should only be used for testing and development purposes. We will be launching a multiparty computation protocol to create a trusted setup that is secured by the wider Ethereum community, where only one person has to act honestly for the setup database to be secure. If you wish to participate please let us know at [email protected]
To see how this library can be used to issue AZTEC confidential transactions and create AZTEC notes, view our demonstration script and documentation in the Aztec repository
For full API docs, view our github pages API
clone this repo to your desired directory and run npm install
const note = require('./note/note');
const proof = require('./proof/proof');
const secp256k1 = require('./secp256k1/secp256k1');
const sign = require('./eip712/sign');
// address of confidential AZTEC - DAI smart contract
const aztecContract = '0x0000';
// main-net chain Id
const chainId = 1;
const accounts = [
secp256k1.generateAccount(),
secp256k1.generateAccount(),
];
const inputNotes = [
note.create(accounts[0].publicKey, 80),
note.create(accounts[0].publicKey, 60),
];
const outputNotes = [
note.create(accounts[1].publicKey, 50),
note.create(accounts[1].publicKey, 100),
];
const kPublic = -10; // input notes contain 10 fewer than output notes = deposit of 10 public tokens
const sender = accounts[0].address; // address of transaction sender
// proofData and challenge are ABI-encoded and ready to beused as inputs to an AZTEC smart contract
const { proofData, challenge } = proof.constructJoinSplit([...inputNotes, ...outputNotes], inputNotes.length, sender, kPublic);
// construct EIP712-compatible ECDSA sigantures over input notes, required to spend input notes
const inputSignatures = [
sign.signNote(proofData[0], challenge, sender, aztecContract, accounts[0].privateKey, chainId),
sign.signNote(proofData[0], challenge, sender, aztecContract, accounts[0].privateKey, chainId),
];
const outputOwners = [accounts[1].address, accounts[1].address];
// transactionData's members can be directly fed into an AZTECERC20Bridge.sol contract's confidentialTransfer method
const transactionData = {
proofData,
m: inputNotes.length,
challenge,
inputSignatures,
outputOwners,
metadata: note.encodeMetadata(outputNotes),
};
return transactionData;
Unless stated otherwise, public keys, private keys and addresses are encoded as hex-strings, prepended by the characters 0x.
Run the repository's tests with npm run test
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