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Web3 integration · medium

31. Signing transactions with ethers/viem

Building and signing transactions in a mobile wallet.

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Libraries like `ethers` or `viem` work in React Native (with a few polyfills for crypto primitives) to build, sign and broadcast transactions from a locally-held private key or a hardware-backed signer.

import { ethers } from "ethers";

async function sendEth(privateKey: string, to: string, amountEth: string, provider: ethers.Provider) {
  const wallet = new ethers.Wallet(privateKey, provider);
  const tx = await wallet.sendTransaction({ to, value: ethers.parseEther(amountEth) });
  return tx.hash;
}

React Native lacks some Node built-ins (like `crypto`), so projects typically add `react-native-get-random-values` and other polyfills before importing these libraries.

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Check your understanding

  1. 1. What must you typically polyfill in React Native for crypto libraries?

  2. 2. What does ethers.parseEther do?

  3. 3. What does wallet.sendTransaction return?

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