{
  "manageEntity": {
    "action": "Save",
    "entityId": "629752",
    "entityType": "Track",
    "nonce": "0x840f62d8a4444b681d8167fab37c04c3bb1f8a51d7ba27df552c519eb5abdf4d",
    "signature": "0x6d89ad94d1969bd670f929d2c203c2f749ce11b54ca6918e265618234d4da24f46f86bf6c5435029b25a0945c54cdd18f4c3695557bc10b0dda05aa9db05901d1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}