{
  "manageEntity": {
    "action": "Save",
    "entityId": "375237",
    "entityType": "Track",
    "nonce": "0x3c66accd6091bb81097348acbd758c6ef27188b59f6dd93df4e1e0952367330a",
    "signature": "0xced361440705d139e03fe6d09ee16bd57230e8cd15c12168cfeaeab1524b3a255e15dab81f8729255b1de871ffefecc81dfc3b4ab8f010362ec99641774feec41b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}