Storage Proofs Contracts

The Storage Proof Contract allows token-holders to prove their balance of an ERC-20 token, thereby enabling the On-Chain Census mechanism.

Using the Contract

The instance of the ERC20 Token Storage contract is resolved from results.vocdoni.eth on the ENS registry.

Contract structs

struct ERC20Token {
    uint256 balanceMappingPosition;
    bool registered;
}

mapping(address => ERC20Token) public tokens;
address[] public tokenAddresses;
uint32 public tokenCount = 0;

Methods

• registerToken Validates and registers the parameters of the given token contract, if not already present.

Getters

• isRegistered Determines whether the given token address has been registered
• getBalanceMappingPosition Retrieves the offset where the balance mapping is located. Used to generate the storage proofs from the client side.