Universal Signer

Overview

@universal-signer/core provides a unified, type-safe interface for various signing providers, all compatible with Viem v2. It allows you to write blockchain logic once and switch between AWS KMS, Google Cloud KMS, Ledger, Trezor, Turnkey, and local keys through configuration.

Installation

npm install @universal-signer/core viem

Then install only the provider(s) you need:

Provider	Dependencies
AWS KMS	`npm install @aws-sdk/client-kms`
GCP KMS	`npm install @google-cloud/kms`
Ledger	`npm install @ledgerhq/hw-app-eth @ledgerhq/hw-transport-node-hid`
Trezor	`npm install @trezor/connect`
Turnkey	`npm install @turnkey/viem @turnkey/http @turnkey/api-key-stamper`
Local	No additional dependencies

Quick Start

import { createUniversalClient, createAwsAccount } from "@universal-signer/core";
import { mainnet } from "viem/chains";
import { http } from "viem";

// 1. Create an account
const account = await createAwsAccount({
  keyId: "alias/my-key",
  region: "us-east-1"
});

// 2. Create a Viem-compatible client
const client = createUniversalClient(account, mainnet, http());

// 3. Sign transactions or messages normally
const hash = await client.sendTransaction({
  to: "0x...",
  value: 1000000000000000n
});

Features & Configuration

For detailed setup and configuration for specific providers, see the following:

Provider Configurations: Details for AWS, GCP, Hardware Wallets, and Turnkey.
Troubleshooting & Technical Details: Common errors and signature normalization info.

Key Capabilities

Unified API: All providers return a standard Viem LocalAccount.
Full Support: signTransaction, signMessage, and signTypedData (EIP-712).
KMS Normalization: Automatic EIP-2 signature normalization and v recovery.
Hardware Ready: Built-in HID management for Ledger and Trezor.