DApp

Trust extends WalletConnect with aditional methods to support multi-chain dApps. Currently, you can get all accounts and sign transactions for any blockchain implements signJSON method in wallet core
Supported Coins
Binance Chain
Ethereum and forks
Cosmos, Kava and other sdk based chains
Tezos
Nano
Filecoin (until mainnet)
Getting started
To use Trust additional methods, you just need to install:
npm install --save @walletconnect/client @walletconnect/qrcode-modal
Initiate Connection
Before you can sign transactions, you have to initiate a connection to a WalletConnect bridge server, and handle all possible states: (code snippet below is copied from https://docs.walletconnect.org/quick-start/dapps/client#initiate-connection)
import WalletConnect from "@walletconnect/client";
import QRCodeModal from "@walletconnect/qrcode-modal";
​
// Create a connector
const connector = new WalletConnect({
  bridge: "https://bridge.walletconnect.org", // Required
  qrcodeModal: QRCodeModal,
});
​
// Check if connection is already established
if (!connector.connected) {
  // create new session
  connector.createSession();
}
​
// Subscribe to connection events
connector.on("connect", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Get provided accounts and chainId
  const { accounts, chainId } = payload.params[0];
});
​
connector.on("session_update", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Get updated accounts and chainId
  const { accounts, chainId } = payload.params[0];
});
​
connector.on("disconnect", (error, payload) => {
  if (error) {
    throw error;
  }
​
  // Delete connector
});
Get Accounts
Once you have walletconnect client set up, you will be able to get user's accounts:
const request = connector._formatRequest({
    method: 'get_accounts',
});
​
connector
  ._sendCallRequest(request)
  .then(result => {
    // Returns the accounts
    console.log(result);
  })
  .catch(error => {
    // Error returned when rejected
    console.error(error);
  });
The result is an array with following structure:
[
  {
    network: number,
    address: string
  }
]
Sign Transaction
Once you have the account list, you will be able to sign a transaction, please note that the json structure is based on WalletCore's proto messages, we suggest using protobuf.js or @trustwallet/wallet-core to generate it properly.
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"
      }
    ]
  }
};
​
const request = connector._formatRequest({
    method: 'trust_signTransaction',
    params: [
        {
            network,
            transaction: JSON.stringify(tx),
        },
    ],
});
​
connector
  ._sendCallRequest(request)
  .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"
    }
}
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Last updated 9 months ago