@tianhr/hedera-token-registry

Token Registry

This repository contains both the smart contract code for token registry (in /contracts) as well as the node package for using this library (in /src).

Installing Package

npm i @govtechsg/token-registry

Package Usage

To use the package, you will need to provide your own Web3 provider or signer (if you are writing to the blockchain).

TradeTrustERC721

Deploying new TradeTrustERC721

import {TradeTrustErc721Factory} from "@govtechsg/token-registry";

const factory = new TradeTrustErc721Factory(signer1);
const tokenRegistry = await tokenRegistryFactory.deploy("MY_TOKEN_REGISTRY", "TKN");

Connecting to existing TradeTrustERC721 on Ethereum

import {TradeTrustErc721Factory} from "@govtechsg/token-registry";

const connectedRegistry = TradeTrustErc721Factory.connect(existingERC721Address, signer1);

List of available functions on TradeTrustERC721

The contract supports all ERC721 methods

TitleEscrow

Deploying new TitleEscrow

import {TitleEscrowFactory} from "@govtechsg/token-registry";

const factory = new TitleEscrowFactory(signer1);
const escrowInstance = await factory.deploy(tokenRegistry.address, account1, account2);

Connecting to existing TitleEscrow on Ethereum

import {TitleEscrowFactory} from "@govtechsg/token-registry";

const connectedEscrow = TitleEscrowFactory.connect(existingTitleEscrowAddress, signer1);

List of available functions on TitleEscrow

_tokenId
approvedTransferTarget
beneficiary
holder
status
supportsInterface
tokenRegistry
changeHolder
endorseTransfer
transferTo

Provider & Signer

Different ways to get provider or signer:

import {Wallet, providers, getDefaultProvider} from "ethers";

// Providers
const mainnetProvider = getDefaultProvider();
const ropstenProvider = getDefaultProvider("ropsten");
const metamaskProvider = new providers.Web3Provider(web3.currentProvider); // Will change network automatically

// Signer
const signerFromPrivateKey = new Wallet("YOUR-PRIVATE-KEY-HERE", provider);
const signerFromEncryptedJson = Wallet.fromEncryptedJson(json, password);
signerFromEncryptedJson.connect(provider);
const signerFromMnemonic = Wallet.fromMnemonic("MNEMONIC-HERE");
signerFromMnemonic.connect(provider);

Setup

npm install
npm lint
npm test
npm truffle <command>

Notes

If you are using vscode, you may need to link the openzeppelin libraries. See https://github.com/juanfranblanco/vscode-solidity#openzeppelin

if you are trying to run tests locally, install truffle globally and then do execute these commands within the project dir.

truffle develop

once the development blockchain is spun up, the interactive console should look like this:

truffle(develop)>

at the prompt type test