Extrinsic 1424-1

{
  "heartbeat": {
    "blockNumber": 1422,
    "sessionIndex": 23,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x7a8e594b6a522f09ae18beb5e01c2e3859c7f3845f39a577a3e7ca059e40921d52eb6d3f4e845b91762140b148d47225daf66db5de75c13f17be46e2b0192b80"
}