{
  "manageEntity": {
    "action": "Save",
    "entityId": "1719314009",
    "entityType": "Track",
    "nonce": "0x4ef8ee274f507f8c017184de503d2a1f554addb37ab19dc8ce8c005c1c5f7a56",
    "signature": "0xc3f231ca85532b4efa613dedd7e8c3f4bfbddb8739a28af57c37dc3be059d4e751ff0a39d211d864f8dfc96716e62db087dbc93125e17720d6891c36b5613a2d1b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}