Extrinsic 1267-1

{
  "heartbeat": {
    "blockNumber": 1266,
    "sessionIndex": 21,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xc23154e078e69e62932c4b760a443ed004ab36b0d06f3db9e8f2717f41924d4e25761dbc8e058923f01e78b616c14fd45e2f4c1f62a3553900215859b38d448a"
}