Extrinsic 20910-1

{
  "heartbeat": {
    "blockNumber": 20908,
    "sessionIndex": 348,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xc648aecde6822d0dcb14f8c2d9706db9fe5545fa968602fda8c57a331938457f905ace029fece84ab664fb7549bae7fb47319b0ef9b8db99a35ba26fc6b43a84"
}