[cryptography] [Bitcoin-development] REWARD offered for hash collisions for SHA1, SHA256, RIPEMD160 and others

2013-09-14 Thread Peter Todd
2.17BTC ($267USD) pledged to the SHA1 reward to date. It's amusing that the Bitcoin scripting language lets you pull off stunts like this; annoying that the scripting language is too limited to pull off much more than this. In any case I'd love to see proof of a SHA1 or RIPEMD160 collision previou

Re: [cryptography] [Bitcoin-development] REWARD offered for hash collisions for SHA1, SHA256, RIPEMD160 and others

2013-09-14 Thread Moritz
On 09/15/2013 03:12 AM, Peter Todd wrote: > It's amusing that the Bitcoin scripting language lets you pull off > stunts like this; annoying that the scripting language is too limited to > pull off much more than this. You have seen the "CoinWitness" proposal? https://bitcointalk.org/index.php?to

Re: [cryptography] [Bitcoin-development] REWARD offered for hash collisions for SHA1, SHA256, RIPEMD160 and others

2013-09-16 Thread Lodewijk andré de la porte
1) We advise mining the block in which you collect your bounty yourself; scriptSigs satisfying the above scriptPubKeys do not cryptographically sign the transaction's outputs. If the bounty value is sufficiently large other miners may find it profitable to reorganize the chain to kill y

Re: [cryptography] [Bitcoin-development] REWARD offered for hash collisions for SHA1, SHA256, RIPEMD160 and others

2013-09-16 Thread Adam Back
Mining power policy abuse (deciding which transactions prevail based on compute power advantage for theft reasons, or political reasons, or taint reasons) is what committed coins protect against: https://bitcointalk.org/index.php?topic=206303.0 (Its just a proposal, its not implemented). Adam