{
  "manageEntity": {
    "action": "Save",
    "entityId": "312154554",
    "entityType": "Track",
    "nonce": "0x9dc32eeb232a442d9ebee4a482a875cdc4ed8d8ffa7d2ae1ba95bd1956768b54",
    "signature": "0xf1c6e7a3853f15f7e126ec78c68b2d11e007e40ca4f4a9abc4657e5ea9fb67f167e4a8302fd8a216c64bfab1044ff8047981c33eb2fee0142ee7a191198e24331b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}