Downloading the whole Bitcoin block chain takes a while.
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@whitequark@jm make double spending nonce reuse with any *DSA, which Bitcoin already uses. It's catastrophic (see e.g. PS3 master key) -
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@whitequark@jm i.e. if double spending is detected, identify the culprit in the DAG and blacklist his whole spending history -
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@whitequark@jm encouragement to get your money from a reputable source and not to launder your money! ;) -
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@whitequark@jm more or less apply the machine learning techniques already used for credit card fraud to an altcoin - 3 more replies
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Chaum ecash (1983) had a similar design where each transaction involved an oblivious transfer of half of the blinding factor. Double spend allowed the bank to unmask the account behind it with 50% probability.
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