Extrinsic 4536-1

{
  "heartbeat": {
    "blockNumber": 4535,
    "sessionIndex": 75,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xd40ef3268e0a7763c68ed242228b15113904f7735640baf29c9b2d24406da56347363b6e28c48fbb55326718b6bf50ebabdad2d1f0154fcada005e4da1d4c485"
}