{
  "manageEntity": {
    "action": "Save",
    "entityId": "559761906",
    "entityType": "Track",
    "nonce": "0x9d31b1875fd0e86611c150d3c30c71d7962aba92acf5c934bf23517fa028caa8",
    "signature": "0xd224f4fa710b38052d13a03004e3b4754393811e87d45132de78c04e9bf8142f756a5250daa279c8c428a60408b822d0f6ccb1ab9386bb2afdc101b35d2714991b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}