Extrinsic 12640-1

{
  "heartbeat": {
    "blockNumber": 12639,
    "sessionIndex": 210,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x66e6a0edcd79a9ca69205ed9c4820f47c0ba00e396b4e3e45b9f368be270c11df2669974a3d226fb7cd7674a36d8c1860e897d819b57e0cc4b97657e0a97a68a"
}