{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904384649",
    "entityType": "Track",
    "nonce": "0x0bd5728974272562a808d4700e663f954d9b1224f7101bdb4b98388a060912ce",
    "signature": "0x2fb36d2d4069a985a9893b67ae7bdd206437653a26f807167b2823a37149d0ba2feab549bcd198f1a28eefefd71e7c6e8590123b1cb0a46567583850166707241c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}