{
  "manageEntity": {
    "action": "Save",
    "entityId": "1567401494",
    "entityType": "Track",
    "nonce": "0xa2a7a5ca1f49b2b76b02570651b51570ffd7ff8755168953ab8cb713d6a889aa",
    "signature": "0x93c6524872be2b1a2157470566cf4fe94a6795091fe6ecde1c07c106ada1b009311a1668c568a2a3922e4b530977741f50e9f73d130bb1f678f4f623873846761c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}