{
  "manageEntity": {
    "action": "Save",
    "entityId": "1213208564",
    "entityType": "Track",
    "nonce": "0x9813baed2676b0e1333ef5ee509e8183735baaa7691a6237911b0a58c04799b2",
    "signature": "0x6b2f90a1d13471b6e0874d1d508a5c5056eb7b74515beca44ec055dff9e2702e505c77dd30e64d7ae57b8043b3c93e38f24089ec7dc65f61f3dd2744c675a2191c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}