{
  "manageEntity": {
    "action": "Save",
    "entityId": "608055",
    "entityType": "Track",
    "nonce": "0xeb0aa1e9240e6d2be8123658afb24d679c7650531ddadca3cb1cb1736fb0c0f4",
    "signature": "0xe3fc32f509c021ab51a0e963da5f04290855af6c10f718d4861aa3d1f291e1634bd84d2680456a5bc23f5836ec8bb34a8e0fc6c0cd6195d14a3af08ecd5b45141c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}