{
  "manageEntity": {
    "action": "Save",
    "entityId": "1320139481",
    "entityType": "Track",
    "nonce": "0xf2da4ba55a1f8a8e4b89d6634b714a058d791209d706fe6aaeca585f47d0b540",
    "signature": "0x6da147ae56653a46748df6a62e18433397165a1c102136a85b52cfb4e66d12767bcf4232a31eb588ab69c9370b4bf95b75d697a2e3a76602d8987bb8106e6d841b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}