Cosmostation Docs

Sign Message

This section explains how to sign Bitcoin messages with Cosmostation Extension.

Message signing is an off-chain operation. It does not broadcast a Bitcoin transaction, but produces a signature your app can verify to prove the user controls a specific BTC address.

Cosmostation’s Bitcoin provider supports two signing formats:

ECDSA (default)
BIP-322 simple

The provider exposes:

signMessage(message, type?)
signMessageBIP322(message) (a convenience wrapper for BIP-322)

SDK Integration (Tomo Wallet SDK)

When using Tomo Wallet SDK, message signing is performed through the SDK-exposed bitcoinProvider, which implements the BTCProvider interface.

ECDSA message signing (default)

const message = 'Hello from Cosmostation';
 
// Default signing format is ECDSA:
const signature = await bitcoinProvider.signMessage(message);
 
console.log('ECDSA signature:', signature);

If you prefer explicitness:

const signature = await bitcoinProvider.signMessage(message, 'ecdsa');

BIP-322 simple message signing (recommended)

const message = 'Hello from Cosmostation';
 
const signature = await bitcoinProvider.signMessage(message, 'bip322-simple');
console.log('BIP-322 signature:', signature);

Or use the convenience method:

const signature = await bitcoinProvider.signMessageBIP322(message);
console.log('BIP-322 signature:', signature);

Vanilla JavaScript Integration

If you are not using Tomo Wallet SDK, you can call the injected provider directly via the browser.

Access Provider

const bitcoin = () => {
  if ('cosmostation' in window) return window.cosmostation.bitcoin;
  window.open('https://cosmostation.io/wallet/#extension');
};
 
const provider = bitcoin();

ECDSA message signing (default)

await provider.connectWallet();
 
try {
  const message = 'Hello from Cosmostation';
  const signature = await provider.signMessage(message); // default: ecdsa
  console.log('ECDSA signature:', signature);
} catch (e: any) {
  if (e?.code === 4001) console.log('User rejected the request');
  else console.error(e);
}

BIP-322 simple message signing

await provider.connectWallet();
 
try {
  const message = 'Hello from Cosmostation';
 
  const signature = await provider.signMessage(message, 'bip322-simple');
  // or:
  // const signature = await provider.signMessageBIP322(message);
 
  console.log('BIP-322 signature:', signature);
} catch (e: any) {
  if (e?.code === 4001) console.log('User rejected the request');
  else console.error(e);
}

Reference: Tomo SDK + Demo

Use these references when you want to confirm exact method signatures, demo flow, or how the provider is wired in a real UI.

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