Also known as public-key cryptography, allows for secure communication between two parties.

Each party creating a pair of unique keys, a public key and a private key.

Private keys are used to digitally sign messages, then the corresponding public keys are used to verify those message signatures.

Elliptic curve cryptography is a very common implementation of asymmetric cryptography.

It's used to secure every day internet communication, peer-to-peer messaging (whatsapp, signal, etc.) and even bitcoin.

Elliptic Curve Digital Signature Algorithm ensures that the digital signatures cannot be forged and do not leak the private key.

What makes this so secure is the difficulty of solving the Elliptic Curve Discrete Logarithm Problem.

Bitcoin uses the following cryptographic primitives

• secp256k1 as the elliptic curve
• RIPEMD-160 and SHA-256 hash functions
• Base58Check encoding for converting public keys to Bitcoin addresses

This website uses the verify-bitcoin-message library to verify signatures on device — without an internet connection.

All the core logic can be found in a single file, verify.ts.

bitcoin-cli verifymessage address "signature" "message"

curl --user <rpcuser>:<rpcpassword> 
--data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "verifymessage", "params": ["address", "signature", "message"] }' 
-H 'content-type: text/plain;' 
http://127.0.0.1:8332/
          

npx verify-bitcoin-message --json 
--address address 
--message "message" 
--signature "signature"
            

<script type="module">
  import verify, { verifySafe } from 'https://unpkg.com/verify-bitcoin-message';
</script>


<!-- Legacy Script Tag -->
<script type="text/javascript" src="https://unpkg.com/verify-bitcoin-message">
</script>
            

npm i verify-bitcoin-message
            

bun add verify-bitcoin-message
            

import verify, { verifySafe } from 'verify-bitcoin-message';

await verify({
  address: 'address',
  message: 'message',
  signature: 'signature'
})

// If you're not a fan of throwing errors:
const isValid = await verifySafe({
  address: 'address',
  message: 'message',
  signature: 'signature'
})
            

• Bitcoin.com
  
• Verify Bitcoin Message
  
• BlueWallet's VerifySignature