Extrinsic 3429-1

{
  "heartbeat": {
    "blockNumber": 3428,
    "sessionIndex": 57,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x70f05d73a3f0d29f1f97e9df26d2cd5cd59792198c648c630a8a914cc86d6f7467a5e6f0e4fd1dbf016f6d22289779ff494267f9941feb5a944c6cebd7a59688"
}