{
  "manageEntity": {
    "action": "Save",
    "entityId": "1523974619",
    "entityType": "Track",
    "nonce": "0xb7b6c9546511f7100cc4e21d9943fa3a06a33455618c16d8d5b04ad5dddf6834",
    "signature": "0x050362a668aadaea60fed68f0a636671c9984f4b12771f9eabcfb693b9d5316c28df7add22fc7efd28bd2a0aad9de9c279b9d730992dee761e3c28873f171c821c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}