{
  "manageEntity": {
    "action": "Save",
    "entityId": "687065829",
    "entityType": "Track",
    "nonce": "0xbf867ebc8707311aa2c2e952c3f0bc6a1796439fe69b3197a77c33f9d3907509",
    "signature": "0x592ef1523388b9b33b56942da7403f26dbdafcf6d3a78ae5ee20f440d8664a866ebb6d8dca113f44b2d398584066f6b599112ae523b133000d9e9ef085f713da1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}