Extrinsic 8970-1

{
  "heartbeat": {
    "blockNumber": 8968,
    "sessionIndex": 149,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x0ab408fb7e55f81096fbf79cc91e47f7b5eb780323528fd49bea25b3eee90962041ed5577ba091c231b7542b84035a91a667c30c3b117b92b72b86951ec26a8e"
}