wtf.go

var order = [...]int{3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15}

func wtfToUUID(netEncoded []byte) uuid.UUID {
	uuidBytes := make([]byte, 16)
	for i := 0; i < len(order); i++ {
		uuidBytes[i] = netEncoded[order[i]]
	}

	return uuidBytes
}

//using the UUID type from 	"code.google.com/p/go-uuid/uuid"

wtf.java

private static final int[] mostOrder = new int[]{3,2,1,0,5,4,7,6};
private static UUID uuidFromWtf(byte[] dotNetEncodedGuid) {
    long most = 0;
    long least = 0;
    for (int i : mostOrder) {
        most = (most << 8) | (dotNetEncodedGuid[i] & 0xFF);
    }
    for (int i = 8; i < 16; i++) {
        least = (least << 8) | (dotNetEncodedGuid[i] & 0xFF);
    }
    return new UUID(most, least);
}

it is.

maybe node does the same? :)