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MetaTx Module

This document defines the MetaTx Module for the CMTA Token specification. The goal of the MetaTx Module is to enable wallets to transfer tokens without having native tokens in their wallet.

[TOC]

Rationale

Support for transaction fee transfer, also known as "gasless transactions" in the Ethereum context.

Schema

Inheritance

surya_inheritance_MetaTxModule.sol

UML

MetaTxModule

Graph

surya_graph_MetaTxModule.sol

Sūrya's Description Report

Files Description Table

File Name SHA-1 Hash
./modules/wrapper/optional/MetaTxModule.sol 8a347f1431a6f387045494ea5c7407e6d89d6772

Contracts Description Table

Contract Type Bases
└ Function Name Visibility Mutability Modifiers
MetaTxModule Implementation ERC2771ContextUpgradeable
└ Public ❗️ 🛑 ERC2771ContextUpgradeable
└ _msgSender Internal 🔒
└ _msgData Internal 🔒

Legend

Symbol Meaning
🛑 Function can modify state
💵 Function is payable

API for Ethereum

This section describes the Ethereum API of the MetaTx Module.

This modules uses ERC2771 implementation from OpenZeppelin: https://docs.openzeppelin.com/contracts/4.x/api/metatx

Functions

Origin: OpenZeppelin

isTrustedForwarder(address)

Signature:
function isTrustedForwarder(address forwarder) 
public view virtual 
returns (bool)
Description:

Return trueif the address put in parameter is the forwarder of the contract, false otherwise