{
  "manageEntity": {
    "action": "Save",
    "entityId": "1515952358",
    "entityType": "Track",
    "nonce": "0xa09c6736a10271a16f56bfad61d6d85f6523178914dd6d397173ffee3e4c7888",
    "signature": "0x223a515cfc51aa4c5312f464a419e25dfc51007cddba68ddf021220fab8875935b03b3c145527a4fdd24a3af4e6f4a68bfbbb73531c50462286b986d048993661b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}