A web based interface to the Bitcoin API JSON-RPC

Command: signmessage

The signmessage RPC signs a message with the private key of an address.

Parameter #1—the address corresponding to the private key to sign with
Parameter #2—the message to sign
Result—the message signature

A P2PKH address whose private key belongs to this wallet.
The message to sign.
signmessage "address" "message"

Sign a message with the private key of an address
Requires wallet passphrase to be set with walletpassphrase call.

1. "address"         (string, required) The bitcoin address to use for the private key.
2. "message"         (string, required) The message to create a signature of.

"signature"          (string) The signature of the message encoded in base 64


Unlock the wallet for 30 seconds
> bitcoin-cli walletpassphrase "mypassphrase" 30

Create the signature
> bitcoin-cli signmessage "1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX" "my message"

Verify the signature
> bitcoin-cli verifymessage "1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX" "signature" "my message"

As json rpc
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "signmessage", "params": ["1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX", "my message"] }' -H 'content-type: text/plain;'