Bitcoin Core 0.21.0rc2 has been tagged! If you would like to contribute gitian signatures for the first time to test reproducible builds for the release, this guide walks you through it and was just updated for rc2--thanks @gugol for contributing #Bitcoin

@zndtoshi @VitalikButerin @ethereum Also, how do they know it's actually 25 users rather than just 25 different addresses owned by the same user?

New #bitcoin optech:

Covers the new taprootactivation website as well as a new funding organization "Brink", looks kinda interesting.

Is there any other example of a thing which has properties similar to BTC testnet coins? Namely: they’re useful because they’re worthless, if they were worth something, they’d be useless? #bitcoin

@kalle Double spending lots of smaller transactions? I think it's been regularly mentioned. E.g., here's an excerpt from a StackExchange answer I wrote in 2014.

Also, the actual BetCoin Dice attack that stole ~$100,000 USD involved the double spending of hundreds of smallish transactions, so it's not just theory. (Though those double spends were against 0-conf transactions, but still with miner assistance.)

@kalle (1) Nitpick: the attack isn't quite free if he succeeds because Joe must include Td in his block where he could've instead included someone else's transaction that paid him a fee.

(2) By implication, the closer typical fees are to the amount of the attack, the less profitable a multi-transaction attack will be. E.g., if fee/tx is $1, then the $100 Lego attack only nets $99 compared to honest mining.

Besides that nitpick, the article's logic and conclusions seem accurate to me.

@berkes Wow! GIMP for Windows was the first program I used where I remember encountering the GPL, which helped me learn about free software. That was in 1999. By 2002 I was running Linux full time.

Yesterday's bitcoin optech featured an unusual story about something that was always likely to happen - someone losing money due (probably) to unwise decisions in setting up a node with a hot wallet on AWS:


I’m told that many Germans are stockpiling cheese and sausages in anticipation of a COVID lockdown — planning, in other words, for a Wurst-Käse scenario

RT @bitcoinoptech
Bitcoin Optech newsletter #124 is here:

- contains a warning about backdoored VM images
- summarizes notable improvements to clients and services
- announcement of C-Lightning 0.9.2rc1
- notes changes to popular Bitcoin infrastructure software

RT @chris_belcher_
This needs retweeting because it hasn't been seen enough. The recent tweet-thread talking about how just ~10% of hashpower can censor txes IS TOTALLY WRONG because it has flawed assumptions.

"These machines are the first general purpose computers ever where you have to make an exclusive choice: you can have a fast and efficient machine, or you can have a private one... Short of using an external network filtering device like a travel/vpn router that you can totally control, there will be no way to boot any OS on the new Apple Silicon macs that won’t phone home, and you can’t modify the OS to prevent this."

@raucao @htimsxela It would actually be interesting if people could make their transactions dependent on other transactions that were censored. E.g. if I suspect txid 0123...cdef was being censored, I could make my "respectable" non-urgent transaction dependent on txid 0123...cdef, so my transaction fee would help contribute towards breaking the censorship.

Bitcoin can't currently do that but there have been proposals for similar things, e.g.

@TallTim @emzy a chain of two stale blocks is pretty rare, though, and the "discovered" time stamp (which I think is the time BitMex received the blocks) indicates there may be something weird in the configuration of some of the involved pools.

RT @bitcoinoptech
Bitcoin Optech newsletter #123 is here:

- shares the announcement of a marketplace for incoming LN channels
- summarizes the 'Add MuHash3072 implementation' Bitcoin Core PR Review Club meeting
- notable changes to popular Bitcoin infrastructure software

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