{
  "manageEntity": {
    "action": "Save",
    "entityId": "488260308",
    "entityType": "Track",
    "nonce": "0x78f29ac67f4b55a7cfdce51e9df99118931dead884dcd5634d63ba57cf851a33",
    "signature": "0xef273fe4b0e211d779cfc4e9b674dcbc7631a9a4ef9ec2e7ad3054a80d68ff494160fec73caeb07e4deab0e5f702b72ace346d85e5a94efa6eea77cbaba6bff41b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}