Extrinsic 8684-1

{
  "heartbeat": {
    "blockNumber": 8682,
    "sessionIndex": 144,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x6e1577ee89998d9e0e9672b05f0d94f0e981ef3749c4b976683af7d2533a9b69645f561ab431ab458921ce3a5f7a6b84a66bce2b8316aaceb5c39f74587beb8c"
}