{
  "manageEntity": {
    "action": "Save",
    "entityId": "627235",
    "entityType": "Track",
    "nonce": "0x4d2db477ef995481142a5e6c0b9b909be6e47b2c8d73cf1f5f7650f7f3ca2a36",
    "signature": "0x7090396e30e2cd9cb2b114c6fc9ee675888f552e187a40871ceca9299b5766597f4bde6e7f1589e28c480b639e2ed08347ed24f705f7d1ed4dfbb22e7d50b53d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}