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Found vanity address! 1Kidxr3wsmMzzouwXibKfwTYs5Pau8TUFn Secret: 7f65bbbbe6d8caae74a0c6a0d2d7b5c6663d71b60337299a1a2cf34c04b2a623 # Use "time" to see how long it takes to find a result $ time ./vanity-miner Found vanity address! 1KidPWhKgGRQWD5PP5TAnGfDyfWp5yceXM Secret: 2a802e7a53d8aa237cd059377b616d2bfcfa4b0140bc85fa008f2d3d4b225349 real 0m8.868s user 0m8.828s sys 0m0.035s The example code will take a few seconds to find a match for the three-character pattern “kid”, as we can see when we use the time Unix command to measure the execution time. Change the search pattern in the source code and see how much longer it takes for four- or five-character patterns! Vanity Address Security Vanity addresses can be used to enhance and to defeat security measures, they are truly a double-edged sword. Used to improve security, a distinctive address makes it harder for adversaries to substitute their own address and fool your customers into paying them instead of you. Unfortunately, vanity addresses also make it possible for anyone to create an address that resembles any random address, or even another vanity address, thereby fooling your customers. Eugenia could advertise a randomly generated address (e.g. 1J7mdg5rbQyUHE‐ NYdx39WVWK7fsLpEoXZy) to which people can send their donations. Or, she could generate a vanity address that starts with 1Kids, to make it more distinctive. In both cases, one of the risks of using a single fixed address (rather than a separate dynamic address per donor) is that a thief might be able to infiltrate your website and replace it with their own address, thereby diverting donations to themselves. If you have advertised your donation address in a number of different places, your users may vis‐ ually inspect the address before making a payment to ensure it is the same one they saw on your website, on your email, and on your flyer. In the case of a random address like “1J7mdg5rbQyUHENYdx39WVWK7fsLpEoXZy”, the average user will inspect the first few characters “1J7mdg” perhaps and be satisfied that the address matches. Using a vanity address generator, someone with the intent to steal by substituting a similar- looking address can quickly generate addresses that match the first few characters: Table 4-13. Generating vanity addresses to match a random address Original Random Address Vanity (4 character match) Vanity (5 character match) Vanity (6 character match) 1J7mdg5rbQyUHENYdx39WVWK7fsLpEoXZy 1J7md1QqU4LpctBetHS2ZoyLV5d6dShhEy 1J7mdgYqyNd4ya3UEcq31Q7sqRMXw2XZ6n 1J7mdg5WxGENmwyJP9xuGhG5KRzu99BBCX 104 | Chapter 4: Keys, Addresses, WalletsPDF Image | Mastering Bitcoin
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