{
  "manageEntity": {
    "action": "Save",
    "entityId": "809859",
    "entityType": "Track",
    "nonce": "0xcff633725bd2e1a08020c48471bc88634ce6ddd532cccd2723315edf826a33bc",
    "signature": "0x2b31e32fd3e5e385958529aa39a222c939dc067ebe26856a427c0d81b6485e4c638b8e3d7b5916e4d363b1788d366268bce79ab79082b5f6b773c00d0d0f5a231c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}