Extrinsic 7540-1

{
  "heartbeat": {
    "blockNumber": 7538,
    "sessionIndex": 125,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x4ea6160b931c85820ad4f1ba2a3d7022038d8dd8007f95f2d3fb84f5f7ea76456129e66839886c28164bade4b938a3df7bd4880447874b2160e9be0dbbb1ec83"
}