Extrinsic 21277-1

{
  "heartbeat": {
    "blockNumber": 21275,
    "sessionIndex": 354,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xc4bc2e63d5e31bce617d3742d21fead0f63a4322f9a411b9ce48820383439e2195aa05a17b723e124c42e2105c0a14cc108fed6433bd5bdf4d189e86ef7aff84"
}