: Response : "{"success":0,"error":"invalid nonce parameter; on key:0, you sent:"}" : String

Dim postdata As String
Dim Method As String
Dim API As String
Dim Secret As String
Dim URL As String
Dim ObjHttp As Object
Dim nonce As String
Dim Sign As String
Dim Response As String

Private Sub Trade()
        
        API = "API_KEY"
        Secret = "SECRET_KEY"
        
        
        URL = "https://btc-e.com/tapi"
        Method = "getInfo"
        nonce = DateDiff("s", "1/1/1970", Date)
        postdata = "method=" & Method & Chr(38) & "nonce=" & nonce
        Sign = Base64_HMACSHA512(postdata, Secret)
        Set ObjHttp = New MSXML2.XMLHTTP60
        
        With ObjHttp
            .Open "POST", URL, False
            .setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)"
            .setRequestHeader "Key", API
            .setRequestHeader "Sign", Sign
            .send (postdata)
            Response = .responseText
        End With
        
    End Sub
    
Private Function EncodeBase64(ByRef arrData() As Byte) As String

    Dim objXML As MSXML2.DOMDocument60
    Dim objNode As MSXML2.IXMLDOMElement
    
    Set objXML = New MSXML2.DOMDocument60
    Set objNode = objXML.createElement("b64")
    objNode.DataType = "bin.base64"
    objNode.nodeTypedValue = arrData
    EncodeBase64 = objNode.Text
 
    
    Set objNode = Nothing
    Set objXML = Nothing
 
End Function

Function Base64_HMACSHA512(ByVal sTextToHash As String, ByVal sSharedSecretKey As String)

    Dim asc As Object, enc As Object
    Dim TextToHash() As Byte
    Dim SharedSecretKey() As Byte
    Set asc = CreateObject("System.Text.UTF8Encoding")
    Set enc = CreateObject("System.Security.Cryptography.HMACSHA512")

    TextToHash = asc.Getbytes_4(sTextToHash)
    SharedSecretKey = asc.Getbytes_4(sSharedSecretKey)
    enc.Key = SharedSecretKey

    Dim bytes() As Byte
    bytes = enc.ComputeHash_2((TextToHash))
    Base64_HMACSHA512 = EncodeBase64(bytes)
    Set asc = Nothing
    Set enc = Nothing

End Function