Luke Dashjr

• Bitcoin Core Developer.
• Attender of Satoshi Roundtable

• Optimistic towards BIP 148 (UASF)

• Bitcoin Knots, a derivative of Bitcoin Core (since 2011 December) with a collection of improvements maintained out of the master git tree.
• A devout Christian
• Open source developer
• BFGMiner, creator
• Eligius mining pool, founder
• Bloq
• A big proponent for smaller blocks. He advocates Bitcoin blocks of 300kb instead of 2mb or even 1gb.
• From the Proof of Work newsletter #71 (20-6-2019)

“A quick note about an attack on Bitcoin that’s been observed in the wild recently. Block witholding attacks have been discussed for a long time—the term refers to two different things, confusingly, but what we’re discussing here is when someone (often from a competing pool) joins a mining pool that pays out based on the average hashrate of the pool but withholds valid blocks, so the pool misses out on earnings and potentially becomes unprofitable.

Recently, F2pool mentioned on wechat that it was observable from hashrate distribution that this was actually happening a lot. Interestingly, there’s been a proposed fix for this from Luke Dashjr for a long time, but it would require a hard fork so it hasn’t been implemented yet.