{
  "manageEntity": {
    "action": "Save",
    "entityId": "273514",
    "entityType": "Track",
    "nonce": "0x404546bc679f3ca20302e510d6a7ee0f9cff02138828d906bd65df681a20c497",
    "signature": "0x610f7ecfb788d5829781bd8acbf51947e0fa8464a74d984bcd71ecd37da1fe8941515167433e17a4ac0ef44863c0f0f647b9fb807bdf8b23a1546a0a1fef19a01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}