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How can we check this still exist/that this is real? You have to find some more information, the name of a Bitcoin exchange, some email messages from a Bitcoin exchange, some written notes. A Bitcoin address usually looks like these examples 1BvBMSEYstWetqTFn5Au4m4GFg7xJaNVN2. 3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy. bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq ...


I understand what GUI wallet softwares are and why those are important for end users. But in a backend application, if I understand correctly, a wallet is simply a seed that can generate some private/public keys pairs in a deterministic way. Is that correct? Correct, but you miss the most important feature of a wallet...crafting transaction / bitcoin script!...

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