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"="signing this message with key" "address"="bcrt1qzpr5cu5tfrcegrfzkusqyt6nj5tfx7qeqpdd4n"

{
  "id": "example:signmessagewithkey#1",
  "method": "signmessagewithkey",
  "params": {
    "message": "signing this message with key",
    "address": "bcrt1qzpr5cu5tfrcegrfzkusqyt6nj5tfx7qeqpdd4n"
  }
}

Response:

{
  "address": "bcrt1qzpr5cu5tfrcegrfzkusqyt6nj5tfx7qeqpdd4n",
  "pubkey": "03128eb6d21daf33c92e6eeac1b06f4a520345a144498d93c24ea9c9ba7b223372",
  "signature": "28459b23d091bbdc2f0e288b86a5702e922449cec85d957e0603a5aaea3a32af430235a23d65fbc54036d383ae8e08da89dd234f676e7d5de6badc296ad99008cb",
  "base64": "KEWbI9CRu9wvDiiLhqVwLpIkSc7IXZV+BgOlquo6Mq9DAjWiPWX7xUA204Oujgjaid0jT2dufV3mutwpatmQCMs="
}