Dave Blumenfeld @dblumenfeld
Dad to a 3 legged cat. Founding engineer @MultifactorCOM. Prev: founder Keypo (acquired). Passionate about privacy preserving cryptography and hardware. dblumenfeld.com Joined September 2021-
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I started Keypo in 2024 to solve this problem. Our first product was called “Digital DVD” because it was digital media that couldn’t be revoked after purchase. At the time no one cared. Everyone was resigned to big tech owning everything. Maybe we were just too early.
NEW: Sony just announced that as of September 1st, 2026 you will no longer be able to watch over 550 previously purchased movies from StudioCanal (Terminator 2, Total Recall, Basic Instinct, Paddington, The Pianist, Johnny English etc.) on the PlayStation YOU NEED TO OWN YOUR
An AI agent is only as useful as the access you give it. But the more access you grant, the more damage it can do. The credential that checks your balance is the same one that drains your account. So how do you share an account with an agent safely?
Am I correct to say that the Zcash community doesn’t believe the exploit has been used because “they’re the best cryptographers and just got access to the best AI tools to discover this vulnerability, so no one else could’ve known about it”?
@mns Should probably just stay there
I’m not prepared for how much I’m gonna cry watching this in theaters
New insider info on the upcoming Oasis documentary 👀 The film is far more than a standard music documentary. It's raw, emotional and unexpectedly intimate. Even people who were never Oasis fans have been completely drawn in by the story The documentary will chart how Noel and
@JoeLallouz Thank you! Appreciate all the advice you’ve given me over the past year plus
Keypo is joining Multifactor! I’ve been working on cryptography products at the intersection of AI Agents since 2024. It’s a problem very few are working on but is the biggest roadblock to agents reaching critical mass. Put it this way: your parents aren’t gonna trust AI with their bank account without knowing there is ZERO ways it can do something malicious. Then one day, I’m watching @tbpn and I hear “Multifactor is building a password manager for AI agents.” Fast forward to meeting @viveknair_1, and I was blown away by his background in cybersecurity. An ex-CIA agent, author of 10 patents in cryptography and most importantly: equally obsessed with building agent security solutions. I’m extremely excited to work with Vivek and the very talented Multifactor team as founding engineer. Together, we will build novel cryptography products that make zero- trust account sharing with agents possible.
6 months ago, we met a team that was remarkably well aligned with our agentic security vision. Today, we're joining forces. We've officially acquired Keypo, Inc., and its founder Dave Blumenfeld is joining us as Founding Engineer, bringing his work on secure enclaves directly
The feeling is mutual. Beyond excited to work together on solving the most important problems facing agent adoption.
Making a strategic acquisition as a seed-stage company was not a decision I took lightly, but so far all I'm wondering is why we didn't do this sooner. We first met the Keypo folks about 6 months ago during the YC batch, and were blown away by not only their alignment on highly
I hate the idea of government owning 50% of the most important companies in the last 20 years, but Bernie is pushing forward an important conversation we need to have of how these companies can benefit all of us. You cant take away 20% of the public workforce AND deny them the ability to invest in the upside of these new technologies, and then expect everyone to lie down and let it happen.
I'll be introducing the American AI Sovereign Wealth Fund Act, a bill giving the public a direct stake to determine AI's future. When a public resource generates wealth, the public should share in that wealth.
@lindaxie Thank you for all the support and feedback you gave me along the way!
Special thanks to @christopherwxyz and @kartiktalwar for being amazing angels, and to @JoeLallouz and @TomatoBAYC for being incredible mentors.
George Lucas having a 17k collection of the most joggery or joggers makes him the GOAT
George Lucas new museum cost $1.5B. Chicago and SF both turned it down. So, it’ll open at Exposition Park in LA in September 2026. It is 300,000 square feet and has 11 galleries holding art (Norman Rockwell, Frida Kahlo), valuable comics (Marvel, DC, Peanuts), original film
Thank you to @default_friend for sharing this wonderful 1992 article on online spaces by John Coate. His insights about what the internet was good for were profoundly ahead of their time Link to the full article "Cyberspace Innkeeping: Building Online Community" below
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