I'd be very careful about cryptography like that. It's almost illegal everywhere and blockchain is the issue with bitcoin, which makes it possible to track down how all your crypto has been received. There are websites like bitcoin blender where you can mask your bitcoin's provenance and make it invisible if you want to, if you insist on playing games like that and even win. The whole procedure is very easy. You're giving them your money, they're giving you your money back, but it's combined with different sections of different bitcoins, and you've got your untraceable bitcoins as a result.
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