Extrinsic 7778-1

{
  "heartbeat": {
    "blockNumber": 7776,
    "sessionIndex": 129,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xf021b451b8959db55c801f04438887124f3d1c4ee4c62a869881933420e2a12d7daa7141b094c95e94f03b1b027b8d45b24864a7df7d813e534c63bbb03b9782"
}