{
  "manageEntity": {
    "action": "Save",
    "entityId": "1544374535",
    "entityType": "Track",
    "nonce": "0x2aeb5022641406f7c91884a98950e480432ec84e000202f60fc7ba84642e7b8a",
    "signature": "0x58f6d1f928413c2554f8c2c0f8f3b95331f8950b058c45ed717512ab0e7cacfe74128d878ea9253662e0df18481d3c246fb539ae51afb9912784257164a42d3c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}