# 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.

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