Extrinsic 15524-1

{
  "heartbeat": {
    "blockNumber": 15522,
    "sessionIndex": 258,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x88914062f23bd3f6d85d970676712b237f50cb98d66b39405df79f630f76830b044bc4e82cc4df54926648f8132e6723b9fd3e517fbc9c5d58747613478b0283"
}