Extrinsic 20920-1

{
  "heartbeat": {
    "blockNumber": 20919,
    "sessionIndex": 348,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x5ee1f2f0a34a59c58617e2a0fbaf099f80ca552988040e3e6fdace9026f28f12fc7a53e9b4348f631490babb728d31c8db712964671f1c8ecd3fa65ecda93c89"
}