DApp

Trust extends WalletConnect with aditional methods to support multi-chain dApps. Currently, you can get accounts and sign transactions for any blockchain.
Supported Coins
Getting started
To use Trust's WalletConnect's implementation, you just need install two packages:
npm install --save @walletconnect/qrcode-modal @trustwallet/walletconnect
Initiate Connection
Before you can sign transactions, you have to initiate a connection to a WalletConnect bridge server, and handle all possible states:
import WalletConnect from "@trustwallet/walletconnect";
import WalletConnectQRCodeModal from "@walletconnect/qrcode-modal";
​
// Create a walletConnector
const walletConnector = new WalletConnect({
  bridge: "https://bridge.walletconnect.org" // Required
});
​
// Check if connection is already established
if (!walletConnector.connected) {
  // create new session
  walletConnector.createSession().then(() => {
    // get uri for QR Code modal
    const uri = walletConnector.uri;
    // display QR Code modal
    WalletConnectQRCodeModal.open(uri, () => {
      console.log("QR Code Modal closed");
    });
  });
}
​
// Subscribe to connection events
walletConnector.on("connect", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Close QR Code Modal
  WalletConnectQRCodeModal.close();
​
  // Get provided accounts and chainId
  const { accounts, chainId } = payload.params[0];
});
​
walletConnector.on("session_update", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Get updated accounts and chainId
  const { accounts, chainId } = payload.params[0];
});
​
walletConnector.on("disconnect", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Delete walletConnector
});
Get Accounts
Once you have walletconnect client set up, you will be able to get the user's accounts:
walletConnector
  .getAccounts()
  .then(result => {
    // Returns the accounts
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
The result is an array with the following structure:
[
  {
    network: number,
    address: string
  }
]
Sign Transaction
Once you have the account list, you will be able sign a transaction:
const network = 118; // Atom (SLIP-44)
const account = accounts.find((account) => account.network === network);
// Transaction structure based on Trust's protobuf messages.
const tx = {
accountNumber: "1035",
  chainId: "cosmoshub-2",
  fee: {
    amounts: [
      {
        denom: "uatom",
        amount: "5000"
      }
    ],
    gas: "200000"
  },
  sequence: "40",
  sendCoinsMessage: {
    fromAddress: account.address,
    toAddress: "cosmos1zcax8gmr0ayhw2lvg6wadfytgdhen25wrxunxa",
    amounts: [
      {
        denom: "uatom",
        amount: "100000"
      }
    ]
  }
};
​
walletConnector
  .trustSignTransaction(network, tx)
  .then(result => {
    // Returns transaction signed in json or encoded format
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
The result can be either a string JSON or an HEX encoded string. For Atom, the result is JSON:
"{\"tx\":{\"fee\":{\"amount\":[{\"amount\":\"5000\",\"denom\":\"uatom\"}],\"gas\":\"200000\"},\"memo\":\"\",\"msg\":[{\"type\":\"cosmos-sdk/MsgSend\",\"value\":{\"amount\":[{\"amount\":\"100000\",\"denom\":\"uatom\"}],\"from_address\":\"cosmos135qla4294zxarqhhgxsx0sw56yssa3z0f78pm0\",\"to_address\":\"cosmos1zcax8gmr0ayhw2lvg6wadfytgdhen25wrxunxa\"}}],\"signatures\":[{\"pub_key\":{\"type\":\"tendermint/PubKeySecp256k1\",\"value\":\"A+mYPFOMSp6IYyXsW5uKTGWbXrBgeOOFXHNhLGDsGFP7\"},\"signature\":\"m10iqKAHQ5Ku5f6NcZdP29fPOYRRR+p44FbGHqpIna45AvYWrJFbsM45xbD+0ueX+9U3KYxG/jSs2I8JO55U9A==\"}],\"type\":\"cosmos-sdk/MsgSend\"}}"
REMEMBER: You have to provide the json structure based on WalletCore's proto messages. Please check the repository for more details.
WalletConnect
Assets
Last updated 2 months ago