{
  "manageEntity": {
    "action": "Save",
    "entityId": "393558847",
    "entityType": "Track",
    "nonce": "0x3e8d17635f57cc740fcb8fc827b14a3f627c5787e4092fafde56abf73ec31204",
    "signature": "0x122d71057ebf6c5f8ae71873345a3f9b63723b5d681c141e6fff9fc4c23818c46c9b2e4151c0c95cd1e5a9df63157b5cd0b53c9563d73d62a27e5ed417400e221b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}