{
  "manageEntity": {
    "action": "Save",
    "entityId": "488161078",
    "entityType": "Track",
    "nonce": "0x948ba0683a5e787ed8ab00ba4d855077e46dc8f31192a18b9d20554c232a0849",
    "signature": "0x792916c2af95cecdfe8d24d888b06a20aa39f3cd66c87a825ffc669491a67f84543e885ad003d0eff0814206a67a18850f16ed91875f13b2e35727333fb3f95c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}