{
  "$schema": "../rpc-schema-draft.json",
  "type": "object",
  "rpc": "signmessage",
  "title": "Command to create a signature from this node",
  "description": [
    "The **signmessage** RPC command creates a digital signature of *message* using this node's secret key. A receiver who knows your node's *id* and the *message* can be sure that the resulting signature could only be created by something with access to this node's secret key."
  ],
  "request": {
    "required": [
      "message"
    ],
    "additionalProperties": false,
    "properties": {
      "message": {
        "type": "string",
        "description": [
          "Less than 65536 characters long message to be signed by the node."
        ]
      }
    }
  },
  "response": {
    "required": [
      "signature",
      "recid",
      "zbase"
    ],
    "additionalProperties": false,
    "properties": {
      "signature": {
        "type": "hex",
        "description": [
          "The signature."
        ],
        "minLength": 128,
        "maxLength": 128
      },
      "recid": {
        "type": "hex",
        "description": [
          "The recovery id (0, 1, 2 or 3)."
        ],
        "minLength": 2,
        "maxLength": 2
      },
      "zbase": {
        "type": "string",
        "description": [
          "*signature* and *recid* encoded in a style compatible with **lnd**'s [SignMessageRequest](https://api.lightning.community/#grpc-request- signmessagerequest)."
        ]
      }
    }
  },
  "author": [
    "Rusty Russell [rusty@rustcorp.com.au](mailto:rusty@rustcorp.com.au) is mainly responsible."
  ],
  "see_also": [
    "lightning-checkmessage(7)"
  ],
  "resources": [
    "Main web site: [https://github.com/ElementsProject/lightning](https://github.com/ElementsProject/lightning)",
    "",
    "[SignMessageRequest](https://api.lightning.community/#grpc-request-signmessagerequest)"
  ],
  "examples": [
    {
      "request": {
        "id": "example:signmessage#1",
        "method": "signmessage",
        "params": {
          "message": "this is a test!"
        }
      },
      "response": {
        "signature": "9ea05929890e40489edbd5fe0552d22bcffe00bbd29da4fcf93ed5d8f1973e421509071a64935231a126637e3615225ddda86d2d0926ae537d9c3be149f9b21f",
        "recid": "00",
        "zbase": "d6xkysjjtr8ry1r65xk9hbk14eih99oyzxjj5j8h9r9pms8t1h9rrfejyhpgjr41ggo1ca56gak1rzq7ibs14njgi3jz58b5hfr9uco9"
      }
    },
    {
      "request": {
        "id": "example:signmessage#2",
        "method": "signmessage",
        "params": {
          "message": "message for you"
        }
      },
      "response": {
        "signature": "8149401781108c1c2fda12d91969bfe2306afe06c387394d47a83a85a14702a16b6fcd0060693da436ff1c2b25cc470d7db68fe45d833733d8dca660a3f4d67d",
        "recid": "00",
        "zbase": "d6yw1oyzoreea8bx5ejp1gmjz9tdy4z6y5baqqkpe6wdibpbehbkn45x3wygy4j7wo5x68bmrzgrqdm7s486ezcdgh37tzfgcnt9jiu7"
      }
    }
  ]
}
