{
  "manageEntity": {
    "action": "Save",
    "entityId": "355864",
    "entityType": "Track",
    "nonce": "0xa0c4575c8606d2fe77f503eb5cf81ced5afe3a242e498c0d754ec4628f346f2d",
    "signature": "0xfe4152d75f6168328494dea2620e2d1060ba196a89b7ab69b6c260e6393376e263e162340dad1b34e9829d1d9c60a177ebc6f52676c3719a2e8b2fe802707e8f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}