{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900699999",
    "entityType": "Track",
    "nonce": "0xaec3f736d99ed47a496c31f26e6ce71041c140eed1f53f29b20c7ea0f6ed9373",
    "signature": "0x97cb0001187cba6a1403de2d45537240960a825680aa15a906e8a489ceab894c794fd7f887d5d38a9a7e0d6a4e235cf97e3645cb6615b936d5a32ffeb2f55f591b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}