Extrinsic 28770-1

{
  "heartbeat": {
    "blockNumber": 28768,
    "sessionIndex": 479,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x30d4577b33b21882d3d78a395a8d86f3828a8b3a9320a94782c6c72f82f860728c831806f1a38e8a2d873bbde5b3ee6a2e6cdc33a38b8e4d634445ac73c4ce80"
}