Message Verifier

Authenticate signed messages on your device — even in airplane mode

Digital signatures cryptographically prove

How it works

Elliptic curve cryptography makes it possible for

  • A private key to sign messages
  • Its corresponding public keys to verify the signatures
  • The signatures never leak the private key

Not only does ECDSA provide security for every day internet communication, it's also used to secure Bitcoin.

Bitcoin uses the following cryptographic primitives

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

See it in action Messages from around the world 🌍
Other ways to verify signed messages
Bitcoin Node Command Line 

bitcoin-cli verifymessage <address> <signature> <message>
RPC 

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/
JavaScript Command Line 

npx verify-bitcoin-message --json \
  --address 1F3sAm6ZtwLAUnj7d38pGFxtP3RVEvtsbV \
  --message "This is an example of a signed message." \
  --signature "H9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk="
Browser 

<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>
Node 

npm install verify-bitcoin-message
Bun 

bun add verify-bitcoin-message
Usage 

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

await verify({
  address: '1F3sAm6ZtwLAUnj7d38pGFxtP3RVEvtsbV',
  message: 'This is an example of a signed message.',
  signature: 'H9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk='
})

// If you're not a fan of throwing errors:
const isValid = await verifySafe({
  address: '1F3sAm6ZtwLAUnj7d38pGFxtP3RVEvtsbV',
  message: 'This is an example of a signed message.',
  signature: 'H9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk='
})
Other Websites
Source Code