Black Twenty One Million Grid Men’s Canvas ShoesThis has become one of my most popular designs, and I think it's because it's a perfect piece of OPSEC. For the 'Black Twenty One Million Grid' Canvas Shoes, I created a tiny original graphic pattern of '21M' in grey and orange on a classic black base. From a distance, it just looks like a cool geometric pattern. But up close, it carries the most important message in Bitcoin. It's a piece of designer Bitcoin footwear printed on a classic pair of Men's