{
  "manageEntity": {
    "action": "Save",
    "entityId": "672464119",
    "entityType": "Track",
    "nonce": "0xf4a040294081831204bd379cecaef5aa8e8c03ab3979cba919599b0bf39c5ccb",
    "signature": "0xc55c95a435b966ed1283ec4f1a7b176f16ffeffdf5dffa3c8f368a9cca8cfa771623e3ec7e05a23f08c66b15e184c0bb39a2896c7538187acaf7d0a4df15f3a51b",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}