Extrinsic 12758-1

{
  "heartbeat": {
    "blockNumber": 12756,
    "sessionIndex": 212,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xa24ae08fce8950e5f800fbf669aad46f56638b11165d4d836ad1f822357cbf1887b188d99674c7ee01abb98e474ccaca3d2a6ccafbdedf3aef483791d400158e"
}