Extrinsic 16479-1

{
  "heartbeat": {
    "blockNumber": 16477,
    "sessionIndex": 274,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x7a3575c750981e6d6bff111868790a7289739d2e4cd9166b46da84cdc5766a1c2fb08c1027a8a259d54f5952c884ba2f68d2391e6f0f6c3f31db115056748d8c"
}