{
  "manageEntity": {
    "action": "Save",
    "entityId": "458972",
    "entityType": "Track",
    "nonce": "0x174a9107c1c20e2f9ca80dd9af4aa1c3e732f6d8b482f226aa7760fe475ceb6d",
    "signature": "0xcbe0b4ddd5db978fc45cdcd5b3f9ee97823bc3314d0a2a0b380e83a87889783746508b1f139774558bccdde52e62f4c1b6c262eb496bad00c4f1ed3b90e41b051b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}