{
  "manageEntity": {
    "action": "Save",
    "entityId": "819898725",
    "entityType": "Track",
    "nonce": "0x4c69052e996443b1209fb71e80bc9c0180a4bdc7e493ce0669e8da4f7bab4423",
    "signature": "0xfbd16c0d8ffa8e6b90027e693888ba2b7640450bca29d39a8721e07def58cac65d062adbcb7e7f642e9e8906968fd687063508da3b8d9fe743ba1f513c9311cb1c",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}