Sign in

Bart Butler

@butlerb.art
1.2K followers 266 following 204 posts

Proton CTO, @proton.me. Current software engineer and executive, former experimental particle physicist and data scientist. Opinions are my own.

PostsRepliesMedia
Bart Butler @butlerb.art · 17/07/2026
Here here. Though base-20 numbers might be worse.
020
Reposted by Bart Butler
max asher miller @maxashermiller.bsky.social · 17/07/2026
Conversation between @reckless.bsky.social and @butlerb.art on Decoder is one of the best tech interviews I've seen in years. Nilay is a master of pushing on executives' pressure points, and Butler is intelligent enough to answer directly (or at least to parry chivalrously). youtu.be/F3b84_tpwvg
youtu.be
Proton’s CTO: No company is going to jail for you | Decoder
YouTube video by Decoder with Nilay Patel
111
Bart Butler @butlerb.art · 07/03/2026
We claim to build products which protect your data to the extent possible from everyone, including us, and protect our users from mass surveillance to the extent possible, and we do. We don’t volunteer to go to jail for you if the Swiss authorities think you’re a criminal and your OPSEC is shit.
050
Bart Butler @butlerb.art · 06/03/2026
Great article!
010
Bart Butler @butlerb.art · 06/03/2026
Dude…we encrypt pretty much everything everything we can, including basically all content. We can’t encrypt credit card payment information. We are very much “pro encryption” but if we get a Swiss court order, we comply.
190
Bart Butler @butlerb.art · 05/03/2026
Umm, we are privacy-focused. We encrypt pretty much everything we can. Payment details cannot be, nor can we ignore Swiss court orders.
1110
Bart Butler @butlerb.art · 05/03/2026
Right, there’s no discretion here.
020
Bart Butler @butlerb.art · 05/03/2026
Swiss companies must comply with Swiss warrants. It’s not optional, nor is it optional for any company in any jurisdiction. MLATs are scrutinized by the Swiss authorities. If those authorities decide to help and issue a Swiss order, there is zero discretion here for Proton or any company.
0151
Reposted by Bart Butler
Frovo @frovo.bsky.social · 01/03/2026
ME: pack a bag, we’re flying to kansas MY WAYWARD SON: what kind of bag
281518364
Bart Butler @butlerb.art · 22/02/2026
That is also my personal crackpot theory as to when we branched of the prime timeline (Bush vs. Gore) and entered our current bizarro world.
000
Bart Butler @butlerb.art · 22/02/2026
I kind of want to build an age verification service just to make sure there’s a least one vendor that doesn’t suck and isn’t a privacy nightmare.
1120
Bart Butler @butlerb.art · 21/02/2026
You’d think that there would be enough historical examples (both very recent and not-so-recent) of how catering to the far-right leads to the center-right being eaten alive that the center-right would stop doing it.
110
Reposted by Bart Butler
Christopher Terry @christopherterry.bsky.social · 21/02/2026
I am so old I remember when state action in the form of a prior restraint was considered bad. And by bad, I mean like the worst thing ever. But this is prior restraint jacked up on book banning steroids mixed with horrific bigotry.
34412
Bart Butler @butlerb.art · 21/02/2026
It astounds me that in a time of rising authoritarianism, surveillance, and censorship, the elected leaders of liberal democracies somehow feel compelled to say, you know what we really need? More centralized governmental control of speech.
130
Bart Butler @butlerb.art · 14/02/2026
And apparently hypocrisy.
240
Bart Butler @butlerb.art · 14/02/2026
This is a very, very bad idea.
190
Bart Butler @butlerb.art · 14/02/2026
Disagree, it has plenty of legitimate uses and can be very important for safety. The problem with social media isn’t that you can pretend be a cat, it’s that algorithms make inflammatory shit go viral for engagement.
070
Bart Butler @butlerb.art · 14/02/2026
The moment a government department with “Homeland” in the name was created everyone knew that it would end up doing fascist shit.
060
Bart Butler @butlerb.art · 14/02/2026
Banning recommendation algorithms would by itself solve a lot of social media’s ills.
180
Bart Butler @butlerb.art · 14/02/2026
No, because that would be catastrophically idiotic.
040
Bart Butler @butlerb.art · 24/01/2026
Republicans are much too afraid of their base and Democrats not nearly afraid enough of theirs.
000
Bart Butler @butlerb.art · 10/01/2026
Please forward the mail to abuse@proton.me, harassment shouldn’t be OK even if it’s common.
110
Bart Butler @butlerb.art · 10/01/2026
Harassment is absolutely against the terms of service and results in a ban. Probably a burner account but if you want to report it we can take action.
120
Bart Butler @butlerb.art · 26/11/2025
YEEEESSSS!
010
Reposted by Bart Butler
Chaxinitus @chaxinitus.bsky.social · 26/11/2025
Oh shit Castle of the Winds hell yeah
1343
Reposted by Bart Butler
👻madeline bOoOoOoOodent👻 @oldenoughtosay.com · 13/11/2025
I’m sorry I just found out that in 1379, as in, 650 years ago, a baby girl was born in Yorkshire and named Diot Coke history is a fucking joke lmao
784599943
Bart Butler @butlerb.art · 25/10/2025
Not to us.
000
Bart Butler @butlerb.art · 25/10/2025
As a USian I looked at the words on this graph and wondered if I was having a stroke.
020
Bart Butler @butlerb.art · 20/10/2025
Aside from some payments stuff (unavoidable), one guess whose services have no AWS dependencies and were up all day today…hint is in bio.
020
Reposted by Bart Butler
Carissa Véliz @carissaveliz.bsky.social · 11/10/2025
Very nice to see my TEDx Porto talk is out! How #privacy can save your life. For more on privacy, get the #book - Privacy Is Power. #AIEthics www.youtube.com/watch?v=xSPR...
youtube.com
How privacy can save your life | Carissa Véliz | TEDxPorto
YouTube video by TEDx Talks
36433
Bart Butler @butlerb.art · 10/10/2025
Mike Johnson, resident Congressional Keebler elf, is a tiny man who is somehow even smaller metaphorically.
010
Bart Butler @butlerb.art · 20/09/2025
This is one reason I always internally roll my eyes when I hear any politician trying to run as a self-described socialist in America. Even if it accurately describes your views, it’s an electoral millstone around your neck. Do you care about winning or not?
020
Bart Butler @butlerb.art · 20/09/2025
Glassholes 2.0
0220
Bart Butler @butlerb.art · 15/09/2025
I inexplicably read the beginning of this post as being about the end of the second round of quantitative easing…
240
Bart Butler @butlerb.art · 14/09/2025
It would rebalance social media back towards big accounts, which have their own issues, but at least following someone is a conscious choice made by a human.
010
Bart Butler @butlerb.art · 14/09/2025
Indeed. I think one could do content-neutral feeds like “things your friends are seeing” without having any content sensitivity at all.
110
Bart Butler @butlerb.art · 14/09/2025
Exactly. The fact that it’s automated doesn’t mean it’s not making editorial choices about what is seen and what isn’t. And it some places (*cough* X *cough*) the algorithm itself is clearly opinionated.
020
Bart Butler @butlerb.art · 14/09/2025
Anti-abuse is hard, can’t always get it right. Which is precisely why suspensions are not deletions.
020
Bart Butler @butlerb.art · 14/09/2025
My pet crackpot legal theory is that recommendation algorithms should already expose platforms to lawsuits over content as they are inherently not content-neutral and thus should make the platform itself a publisher.
2102
Bart Butler @butlerb.art · 12/09/2025
Sci-Fi: Don’t build the Torment Nexus; Tech bros: Look we built the Torment Nexus!
010
Bart Butler @butlerb.art · 12/09/2025
The internet was a mistake.
5142
Bart Butler @butlerb.art · 30/08/2025
It’s supposed to evoke the idea that neither we, nor anyone else compelling us, can access it at-will.
010
Bart Butler @butlerb.art · 30/08/2025
Picture is about 5 years ago, but same, nice to meet you!
010
Bart Butler @butlerb.art · 30/08/2025
It’s the same terminology we’ve used for outside messages coming into Proton Mail (also encrypted at rest) for 10 years. If we meant E2EE, we’d say it, as we do elsewhere where it applies.
120
Bart Butler @butlerb.art · 30/08/2025
Appreciate your business and trust. And no attack, just saying why DDG’s offering here is different (and worse from a privacy perspective) than Lumo.
duck.ai
DuckDuckGo AI Chat at DuckDuckGo
DuckDuckGo. Privacy, Simplified.
010
Bart Butler @butlerb.art · 30/08/2025
Sure, but the actual content of the chat could be sensitive depending on what context you give the bot, that’s the risk. Much more likely in a long chat context than for a search string.
100
Bart Butler @butlerb.art · 30/08/2025
Some parts of this are misunderstandings of what it does or how one would get information, i.e., the models used are listed on the @proton.me website, no hiding the ball there. And nobody claimed E2EE, it’s not, it’s encrypted at rest, which still means it would be much harder to leak conversations.
120
Bart Butler @butlerb.art · 30/08/2025
Duck.ai sends content to OpenAI, who may log it.
duck.ai
DuckDuckGo AI Chat at DuckDuckGo
DuckDuckGo. Privacy, Simplified.
200
Bart Butler @butlerb.art · 17/08/2025
By illegal I mean the direct advertising, not the products themselves.
010