{
  "manageEntity": {
    "action": "Save",
    "entityId": "369743",
    "entityType": "Track",
    "nonce": "0xff26f08d7a5c52129a1ff446efab51e035a13a688a791e13eae55d5e91b6f7b0",
    "signature": "0xeea0af032d33da88034830e41f1fa852057d1b07561e3624c0fb6528819f65dd2c72827a6bc1047080bc91bbe67546c1af013b18c9498609b2edd3e787559f621c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}