{
  "manageEntity": {
    "action": "Save",
    "entityId": "678374618",
    "entityType": "Track",
    "nonce": "0xbe72dcdd385433a8a512b7be4ec96e1776430edde178340a57af20054755581c",
    "signature": "0xd6f6652cbdb0409e3a9f3b1a83684eb35abae3bbc0c858999e45637a44f908ff370ad169b3295dbb47de27498033773db7c2a16f270792208a0d9f7facc7f27e1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}