{
  "manageEntity": {
    "action": "Save",
    "entityId": "1500914927",
    "entityType": "Track",
    "nonce": "0xd52335527219eea9f376ea86db1f0ad87918558927b84aac646ab74c00f8baa5",
    "signature": "0xaf5e0c425a2dd4929acca22754e3d30375803b2d92a4b62f83bcdb7eff45a0db199a4ca09b5fd4b637e91e736e04ffaf4bccef0a7b4d30384642ad48a6d18c311b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}