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Version: 1.0.1

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User Signs Up​

User signs up by providing an identity commitment and an initial balance. It also inserts a state leaf into the state tree.

contracts/Unirep.sol
function userSignUp(uint256 identityCommitment, uint256 initBalance) public
info

source: Unirep.sol/userSignUp

If user signs up through an attester (msg.sender is a registered attester) and the attester sets the airdrop amount initBalance non-zero, the user will have a one non-zero leaf in his user state. The non-zero leaf is computed by

const hasSignedUp = 1
const airdroppedLeaf = hash(initBalance, 0, 0, hasSignedUp)
info

See: core/src/computeInitUserStateRoot

Attester Signs up​

Attester can sign up through attesterSignUp and attesterSignUpViaRelayer.

contracts/Unirep.sol
function attesterSignUp() external override
info

source: Unirep.sol/attesterSignUp

If an attester signs up through his wallet or another smart contract, UniRep smart contract will record the msg.sender and assign an attester ID to the address.

contracts/Unirep.sol
function attesterSignUpViaRelayer(
    address attester,
    bytes calldata signature
) external override
info

source: Unirep.sol/attesterSignUpViaRelayer

The attester can also sign up through another relayer, but he has to provide the address of the attester who wants to sign up and the signature. The attester signs over his's own address concatenated with this contract address, then the UniRep smart contract will verify the signature by verifySignature.