{
  "manageEntity": {
    "action": "Save",
    "entityId": "753768545",
    "entityType": "Track",
    "nonce": "0xb4c7d680ef13e76e0c02ac1bfc3abd31009f502565a9df68276f25e43f973641",
    "signature": "0x851f02c0765536b8221c60e90731412b5aef85acba93209de0b5e3d993ae3e635f6b1ae117bc641aa731cd22ae238912872f8e6e286ccd4dcd8956f95b92c9191b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}