Extrinsic 15434-1

{
  "heartbeat": {
    "blockNumber": 15432,
    "sessionIndex": 257,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x7c2a5c4c550ab8fc84d1e40698f51890734db8cd5250b068c904c0b206fc567d872c399cbee8e6d8e97b97eeb7aa34d4cb11e11ef97e051474d2d8a1012e1e82"
}