want. Lets assume that the attacker has as much hashing power as the whole bitcoin network put together and that they run their attack for a century. Keep in mind that if you own the private key, you can spend the coins that are in the address. They could, if they were lucky enough to create the same private key.
Bitcoin Hash Collision
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Go back to bed and dont worry about this ever happening. Given the mathematical laws that govern hash functions, it is inevitable that hash collisions will occur for some values of input data (because the range of data you could put into the hash function is potentially infinite, but the output length is fixed). Ripe MD160 and SHA256 hash functions both of which are necessary for the integrity of the bitcoin standard, and would therefore be calamitous for the network if compromised. Hash collisions, as laid out in a recent CoinDesk explainer, a hash function (of which SHA1 is an example) is used to take a piece of data of any length, process it, and return another piece of data the hash digest with a fixed length. In this application we don't care about attackers generating collisions with themselves. Its the efficiency of this method that means SHA1 is now officially broken. Todd concluded: If you claim that bounty, you better go spend your bitcoins pretty quick.
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