ReferralSigning

Title: Referral signing contract

Author: Malda Protocol

Manages user referrals with signature-based verification

State Variables

Tracks if a user was referred by a specific referrer

mapping(address referredBy => mapping(address user => bool wasReferred)) public referredByRegistry

Maps users to their referrer

mapping(address user => address referredBy) public referralsForUserRegistry

Lists all users referred by a referrer

mapping(address referredBy => address[] users) public referralRegistry

Total number of users referred by a referrer

mapping(address referredBy => uint256 total) public totalReferred

Tracks if a user has been referred

mapping(address user => bool wasReferred) public isUserReferred

Nonce for each user to prevent replay attacks

mapping(address user => uint256 nonce) public nonces

Modifier to check if the user is a new user

modifier onlyNewUser() ;

Claims a referral with signature verification

function claimReferral(bytes calldata signature, address referrer) external onlyNewUser;

Parameters

Name	Type	Description
`signature`	`bytes`	User's signature proving consent
`referrer`	`address`	Address of the referrer

Emitted when a referral is successfully claimed

event ReferralClaimed(address indexed referred, address indexed referrer);

Parameters

Name	Type	Description
`referred`	`address`	The referred user
`referrer`	`address`	The referrer

Emitted when a referral claim is rejected

event ReferralRejected(address indexed referred, address indexed referrer, string reason);

Parameters

Error thrown when the user is the same as the referrer

error ReferralSigning_SameUser();

Error thrown when the signature is invalid

error ReferralSigning_InvalidSignature();

Error thrown when the user has already been referred

error ReferralSigning_UserAlreadyReferred();

Error thrown when the referrer is a contract

error ReferralSigning_ContractReferrerNotAllowed();