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 Material Bitcoin - a metal bitcoin wallet

isn't that dumb,  because the manufacturer knows your private key?

https://brotka.st/media/4f111a534af388ac220aeedc91248b9a33f358ddfdc01d0df6e5bdf688f93da9.jpg

https://brotka.st/media/5234e31204dc72b51caf47fe8c2e59d8294ca0ae586616e3e3540049ae3a6465.jpg

https://brotka.st/media/20ef6b19ac7df66045bdad8f9524dce717f6eb020dca4af1e9a4907ec3c97db6.jpg