{
  "manageEntity": {
    "action": "Save",
    "entityId": "731694",
    "entityType": "Track",
    "nonce": "0xec90b0faec83389ceb813e8078633387e85e0b100245d217d670bfdfcf0bf904",
    "signature": "0xf77ab5d17e25b8b355963dad0ec7cfb71927ca0378a7bb00af0b318d30d9755220b2e9fe631d49153edae224f7166206551d2e5e3b6d897ef85ba842d7e2ac081b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}