{
  "manageEntity": {
    "action": "Save",
    "entityId": "747041",
    "entityType": "Track",
    "nonce": "0x16b7ff2c8a53a4f7756874af1382054d89778e6f87c4b714980334b893a9a783",
    "signature": "0x84b6f2cf8651e2d5d09c06b5810c9bccfa2bcc425d0d5a2b118f14e63cf3381d2ef2c05f17ea373d491540820b3175343e026c081c98a25ac9d53f0bee1c19db1c",
    "signer": "0x53d8e61f7BdCd69E26B5AAe8F197464091224DB4",
    "userId": "99786"
  }
}