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.
null
signmessage "address" "message"

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

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

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

Examples:

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;' http://127.0.0.1:8332/