{
  "manageEntity": {
    "action": "Save",
    "entityId": "770068",
    "entityType": "Track",
    "nonce": "0x1277dc2de71fa1fae72fd2bd11d40c3405bd016cba1e6c8cca3076abed2bda41",
    "signature": "0xdc4e73f7cb909497145a0905ce852bf1a8c1e4d7ed655fd16561bafa23c077d57a0c2078f7d7c591d5b61c49d1e5ad8e4e616c96baf1c1071941758f702d9b351c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}