signmessagewithkey -- Command to create a signature using a key from the wallet

SYNOPSIS

signmessagewithkey message address

DESCRIPTION

Command added in v25.05.

The signmessagewithkey RPC command creates a digital signature of message using the key associated with the address provided in the input. The signature scheme follows the BIP137 specification.

message (string): Less than 65536 characters long message to be signed by the node.
address (string): A Bitcoin accepted type address for lookup in the list of addresses issued to date. Only P2WPKH type addresses are supported

RETURN VALUE

On success, an object is returned, containing:

address (string): The bitcoin address used for signing.
pubkey (pubkey): The public key associated with the bitcoin address provided.
signature (hex): The signature.
base64 (string): The signature encoded in base64.

AUTHOR

Lagrang3 [email protected] is mainly responsible.

RESOURCES

Main web site: https://github.com/ElementsProject/lightning

EXAMPLES

Example 1:

Request:

lightning-cli signmessagewithkey -k "message"="a test message" "address"="bcrt1qgrh5vtf63mtayzhxwp480aww3j3qfr5qpq65un"

{
  "id": "example:signmessagewithkey#1",
  "method": "signmessagewithkey",
  "params": {
    "message": "a test message",
    "address": "bcrt1qgrh5vtf63mtayzhxwp480aww3j3qfr5qpq65un"
  }
}

Response:

{
  "address": "bcrt1qgrh5vtf63mtayzhxwp480aww3j3qfr5qpq65un",
  "pubkey": "03bc4a456585ba21ba26af4a0e5399ec76410b2e0ca67db0f3bcb2f47b232fa4b0",
  "signature": "28564edf260a72d991cbb38cf608e293124f8b8f478d13d4544fe27b9d76c65df1284ca395ccdfd3d5f151729ef18f56c028f5f860155d6aa4d0aaaa176a00db01",
  "base64": "KFZO3yYKctmRy7OM9gjikxJPi49HjRPUVE/ie512xl3xKEyjlczf09XxUXKe8Y9WwCj1+GAVXWqk0KqqF2oA2wE="
}