Smart contracts used by the gateway on the Ethereum blockchain.

The 0xcert Framework is a free and open-source JavaScript library that provides tools for building powerful decentralized applications. Please refer to the official documentation for more details.

This module is one of the bricks of the 0xcert Framework. It's written with TypeScript and it's actively maintained. The source code is available on GitHub where you can also find our issue tracker.

Warning about deploying Gateway smart contract

To prevent replay attacks (signed order created on testnet can be executed on mainnet), the order signing mechanism includes the contract address in the order you sign. This way, only a specific smart contract address can execute the signed order.

Ethereum CREATE2 and other methods provide ways of deploying the same contract on different networks that end up with the same contract address. This is the reason this warning exists. If you are deploying the Gateway yourself or if you are using a third-party deployment that you do not trust, this could become a possible vulnerability.

All 0xcert-deployed addresses are available in Documentation. We will never deploy smart contracts on different networks in a way that would assign it the same contract addresses.

Build

By default, the contracts in this package are built for Constantinople EVM. If you would like to use these smart contracts for Wanchain or other blockchains using EVM for a different version, you will need to rebuild them for the desired version.