Extrinsic 20269-1

{
  "heartbeat": {
    "blockNumber": 20267,
    "sessionIndex": 337,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x5a6708d6ca0f2a9e6dc801a9dd61db8a0ffb3b0b4943b6044ceff81a3477e7471a20c01b510c86e1e3c29ae784f7950c88c63b1b05abc7f2e036e1c79d9a2d83"
}