{
  "manageEntity": {
    "action": "Save",
    "entityId": "428379",
    "entityType": "Track",
    "nonce": "0xeeb1e04292369df9ddc24dbc2b5c357acb3cb5a477539ff826c7645302782742",
    "signature": "0xd8a4e0474684b5a2d0da4c4c0bd57158768fa5f7b75ca69c51085c589a76c803345085040aaaf3deab050c2c3405e2ae6865f7ac1eb4016490661a74f7b9bcb81c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}