Filippo Valsorda✓ Add us as a preferred source on Google
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Make a deal with Filippo Valsorda
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
13.9K
Account age
3 yrs
💰 Suggested sponsorship rate
$78 – $126 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🎁 Free analysisfor Filippo Valsorda
📊 Post engagement
Recent posts · likes + reposts
Jun 23latest
37
Avg engagement / post
19–55
Typical post (engagement)
0.3%
Engagement vs followers
73/100
Very consistent reach
Dec 2022
On Mastodon since
Half of recent posts land between 19 and 55 likes + reposts (median 30) — a dependable floor a sponsored post can count on.
🔥 Top post: Passkeys can be stored just like password hashes! I'm proposing · 82 likes + reposts
📊 Activity & format
Posting cadence
1.7 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 11 text · 1 image · 0 video.
Follower / following
386×
Follows 36 back. A strong ratio — an audience that follows them, not a follow-for-follow network.
Recent posts
View on Mastodon ↗
Huh, it’s not every day that an LLM suggests on the issue tracker a low-hanging fruit change that saves 30% on X25519 handshakes.
We already had a much faster edwards25519 fixed-base scalar mult, which can be used for half of ECDH with a s…
Made a little nice monitoring tool for CT logs.
https://uptime.geomys.org/ct/
When queried, it submits a per-minute deterministic precert to the log, checks the SCT, fetches the STH, checks inclusion of the SCT, returns 200 if all is good.…
On Saturday night, one of our CT logs rejected most submissions for 30 minutes.
I just published the post-mortem, and the investigation was... a lot of fun? It involves Go mutex starvation, SQLite WAL behavior, and ZFS record sizes.
I got …
It’s very clear by now that if LLMs are not improving your software quality it’s either a revealed preference (yours or your org’s) for more volume vs more quality, or a skill issue.
The level of testing and review they are enabling in the…
After a year and a quarter of operating the Tuscolo Certificate Transparency log (with a total of 8 minutes of planned downtime)...
I am happy to announce the second Geomys CT log: Trastevere!
It's basically identical, except it's a Dell P…
It's not my usual beat, but I wrote a pure-Python ML-DSA verifier.
pip install mldsa
It's 350 lines, CC0/0BSD, single-file, no dependencies, and thoroughly tested.
Signature verification handles no secrets, so it doesn't need to be constan…
"Could you support $SMALL_TWEAK? We need it for $OBSCURE_PROTOCOL. It's very small! Why not?? Do you hate us?"
Here is a bunch of work to fix assembly that assumed it could overread/write the AES-GCM ciphertext because it'd be followed by …
Setting up Gerrit on exe.dev with X-ExeDev-Email auth took 60s!
However, that doesn't make git work. I hacked together a little proxy that does a tiny amount of OAuth2, exchanging exe.dev auth in the browser for a token that works with git…
The endless long tail of the post-quantum transition includes: Apple Business encrypts FileVault recovery keys to a customer-generated RSA public key.
There's a literal "openssl req -newkey rsa:2048" in the docs.
https://support.apple.com/…
https://securitycryptographywhatever.com/2026/03/25/ai-bug-finding/ is very very good.
If you read my vulnerabilities post, this podcast episode is much more worth listening to.
We all know vulnerability reports are not like ordinary issues. But why?
It comes down to needing the scarce insight and temporary confidentiality to protect users.
However, now that LLMs can find more or less the same bugs for everyone, n…
It's not my usual beat, but I wrote a pure-Python ML-DSA verifier.
pip install mldsa
It's 350 lines, CC0/0BSD, single-file, no dependencies, and thoroughly tested.
Signature verification handles no secrets, so it doesn't need to be constan…
"Could you support $SMALL_TWEAK? We need it for $OBSCURE_PROTOCOL. It's very small! Why not?? Do you hate us?"
Here is a bunch of work to fix assembly that assumed it could overread/write the AES-GCM ciphertext because it'd be followed by …
Setting up Gerrit on exe.dev with X-ExeDev-Email auth took 60s!
However, that doesn't make git work. I hacked together a little proxy that does a tiny amount of OAuth2, exchanging exe.dev auth in the browser for a token that works with git…
The endless long tail of the post-quantum transition includes: Apple Business encrypts FileVault recovery keys to a customer-generated RSA public key.
There's a literal "openssl req -newkey rsa:2048" in the docs.
https://support.apple.com/…
https://securitycryptographywhatever.com/2026/03/25/ai-bug-finding/ is very very good.
If you read my vulnerabilities post, this podcast episode is much more worth listening to.
We all know vulnerability reports are not like ordinary issues. But why?
It comes down to needing the scarce insight and temporary confidentiality to protect users.
However, now that LLMs can find more or less the same bugs for everyone, n…
🐘 Community & instance
Home server
abyssdomain.expert
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
✅ Link-verified
Verified link
Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.
On Mastodon since
Dec 2022
Joined in the Twitter-exodus wave of late 2022 — part of the migration that made Mastodon a real destination.
💡 Facts
🗓️Joined Mastodon in 2022 — 3 years ago.
👁️Averages 37 views per post.
📤Posts about 1.7× per week.
🏅Earned the 10K Followers for passing 10K followers.
🕵️ Fake follower check
Estimated81/100
Excellent
Credibility score
97%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 97% real, active audience · Low fake-follower risk.
- Engagement (~0.3% of followers engage each post) is around typical for Mastodon.
- Organic base — far more followers than accounts it follows.
- Verified account.
- Established account (3+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
RC F'13, F2'17
Cryptogopher / Go cryptography maintainer
Geomys founder (https://geomys.org)
https://mkcert.dev / https://age-encryption.org / https://sunlight.dev
🕳️ “Gaze not into the abyss, lest you become recognized as an abyss domain expert, and they expect you keep gazing into the damn thing.” —@nickm
https://filippo.io/newsletter
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
C.Suthorn :prn:
17%
elementary
16%
Jen Sorensen
14%
Graham Cluley
14%
Zuzana Paar
12%
Alice McFlurry :bc:
10%
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Frequently asked questions
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How many followers does Filippo Valsorda have?
Filippo Valsorda has 13,880 followers on Mastodon.
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