Extrinsic 268-1

{
  "heartbeat": {
    "blockNumber": 267,
    "sessionIndex": 4,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x206b885a3959153f43662735d14cfe817ab7165f902a9c18ca76c13b4b55a709642697d0e81e4dfb31b37170388a8a7dce57fd91bbc15dd6a9758c318324ab86"
}