Extrinsic 21272-1

{
  "heartbeat": {
    "blockNumber": 21270,
    "sessionIndex": 354,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xee33907fcdfde5a8c27b7d4cb7b26de67a378b4733e9bb223c8f6ff19fad4837bcd587f9d2f56597c1d6c339ef5f3b5964ec1963a5e8914f19566db140a83a88"
}