Extrinsic 28540-1

{
  "heartbeat": {
    "blockNumber": 28539,
    "sessionIndex": 475,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x029534b275c185cddab8f2e28b0621377b1a5116d73d3119fb48141c1e92ce4a7c810bbc526f9ee8a690db48699eb81c7dcc71d034c5db434a0f2cec623e5386"
}