Extrinsic 8387-2

{
  "heartbeat": {
    "blockNumber": 8386,
    "sessionIndex": 139,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x3e23809d334f2c31cb32b9fb1da54c45e856eb5ba30e41aec1d3ee6d39c5c82012ffd9efe8eaffe8f1ebc9a2394add6b7b2d3ebb5a0c6785dba55ddfa89dc687"
}