This Wednesday, Bitcoin developers will demonstrate "attack blocks" taking advantage of a consensus vulnerability on the Signet test network.
In two days, on Wednesday April 8th, a handful of Bitcoin Core developers are going to be doing a demonstration of “attack blocks” designed to take an inordinate amount of time to verify on Signet.
The demonstration will take place at 10 AM EST (2 PM UTC). Anyone who wishes to participate can run Bitcoin Core node on Signet and watch the blocks be mined and processed by their node in real-time.
Instructions can be found here to spin up a node and follow along (including how to check your node’s logs to see the verification times for the attack blocks).
The demonstration is not going to show the worst case of the attack (the script and transaction structure required has not been publicly revealed to not give malicious actors even more information about the attack), but it will produce blocks that take orders of magnitude more time to verify than your average block.
