{
  "manageEntity": {
    "action": "Save",
    "entityId": "290196",
    "entityType": "Track",
    "nonce": "0xb57d1d603cb46ec179798027d5ee0faa38b80ef04414ab0e3bd1723fe723b0d8",
    "signature": "0x5881d228bef21a647aa5d8a1631de12fae9881818cae16d11db3e6a5a8fa13785fde58c19e384cf9574b181fe92efe6298b3586600396442d529fe74c4a010c51c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}