{
  "manageEntity": {
    "action": "Save",
    "entityId": "648747",
    "entityType": "Track",
    "nonce": "0x7e2f39c6ae442064c3f38e8835e5d5ffe3090409696639f00bb71e647c3bd58d",
    "signature": "0x4fbec465f8abbe3c4064e23da4ca33ccae00eb1219310d517723e9cc5d73186f221a618252bcfa2dfe8190aac720e6dc8d187e5fbcad11982c93ebee5659aae91c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}