After reading about performance optimizations on the Bitcoin Core blog, I wanted to see a chart of that. I couldn’t find one, so I spun up a bunch of EC2 nodes and set out to measure how long it took each new version of the bitcoin core client to sync the…

I was trying to improve the functional tests for bumpfee, a Bitcoin Core wallet feature that lets you increase the fee of a transaction that’s unconfirmed and stuck. Unfortunately I introduced a bug in the test, which I’m still in the process of tracking down…

This article is based on the slides I used for a presentation at the Hong Kong Bitcoin Developer meetup on November 1st, plus some feedback I received on the chainspl.it Slack. This was before SegWit2x was called off, but in the interest of (my) time, I haven’t…

First, I’ll let Jimmy Song explain transaction replay attacks:

It may be true in general, but this is not a good example. BIP 32 already introduced strict…

To get an idea of the level of confusion that a lack of replay protection can cause, here’s my experience from the ETC-ETH split: https://medium.com/@dao.challenge/replay-attack-challenge-998e0123df21

IETF’s RFC 7282 is an eloquent document which describes important aspects on consensus, and worthwhile if you want a more nuanced interpretation than “widespread agreement and disagreements addressed (even if not acommodated)”.