{
  "manageEntity": {
    "action": "Save",
    "entityId": "74173689",
    "entityType": "Track",
    "nonce": "0x3a778ce2a3071e3fa3e2419decd9f04a9fa13b04b985f888c1e43ed09ca13210",
    "signature": "0x28b52136d12f66801aa05753a4fdc881d378ff5c4f81294a4ca5a3dcdf729d2465e8e1f566bb9d2ee59ca990f4811e64759e3d14d32f71245a46acec2d4932a81b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}