Extrinsic 6461-1

{
  "heartbeat": {
    "blockNumber": 6459,
    "sessionIndex": 107,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x802e3e4644a1045b71598007abab270ae97af8315a55275318172a2b4bc1be427610814551c0a354b6bd9833d3187129e13b5f3150a1c55a12a64f34fcd0358b"
}