{
  "manageEntity": {
    "action": "Save",
    "entityId": "499331",
    "entityType": "Track",
    "nonce": "0xf5f46fa1b1c202420ba61efd474719424c51e8665187c7a1e65d2fb1f0d8a61e",
    "signature": "0xeccb7434136c4d97e15ae0162913f2cd0b227a6be31a9d1eb21386259b6b861657e922f9837c79781d2ffa1c1a4095606d3a29b6af35b30b8eab9628dacc2e811c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}