{
  "manageEntity": {
    "action": "Save",
    "entityId": "207355737",
    "entityType": "Track",
    "nonce": "0x477c71e870eb28032b82211b8d924ac6fd51ac152ad154e0f450ed0a2c58d99a",
    "signature": "0x7f60e7b4001984002c58e2c8f5a716c2e488b4fffe24d8f9dee92c609e2952d92cdea9df7cb0434ca262c70e389f02eaa24817e5319f9a282d8dc7e42e0ef8cd1c",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}