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a Block withholding attack where a miner gets a headstart on sorving the next block

I believe what you are describing is known as the "selfish mining" attack. It is distinct from the usual meaning of the "block witholding" attack, although it has obvious ...
RedGrittyBrick's user avatar
1 vote
Accepted

If SHA256 is successfully attacked, will we need to replace the hash function and re-timestamp the entire blockchain from the beginning?

There was a similar question to this on the BitcoinTalk forum in 2010, to which Satoshi Nakamoto contributed: SHA-256 is very strong. It's not like the incremental step from MD5 to SHA1. It can ...
Lee's user avatar
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