Extrinsic 15580-1

{
  "heartbeat": {
    "blockNumber": 15578,
    "sessionIndex": 259,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x587eba0c2a084b81efeffa6fb1fbb1a4b3a60ffd87071fb1520ef0665e9f67506e7f6401e40a042e0710a51e1c6eb77bd28aba632ea73c37910c9e1905679083"
}