Extrinsic 6574-1

{
  "heartbeat": {
    "blockNumber": 6572,
    "sessionIndex": 109,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xf0cd75e7aa1cd5c6da68c82b0de8915f70bac0b011e95c95bff92d0518ff0768c3db79032f4028693363d90b9a9eccac2befb229d6d3ad128b70ec54f2b6b48b"
}