Johann N. Löfflmann✓ Add us as a preferred source on Google
🔄 Data last refreshed 2 days ago
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Make a deal with Johann N. Löfflmann
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
5
Account age
4 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🎁 Free analysisfor Johann N. Löfflmann
📊 Post engagement
3
Avg engagement / post
60%
Engagement vs followers
Apr 2022
On Mastodon since
🔥 Top post: Hello World 😀 · 7 likes + reposts
📊 Activity & format
Posting cadence
0.04 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 7 text · 2 image · 0 video.
Follower / following
0.5×
Follows 10 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
Prefer clicking to typing? HashGarten is the GUI for Jacksum, and the File Browser Integration brings both into Finder, Windows Explorer and many Linux file managers (Nautilus, Dolphin, Thunar, …).
New in the docs: a cookbook of use cases …
Jacksum 4 is here – a major release of my open-source checksum tool (current release: 4.0.2).
• 586 algorithms, and --info tells you whether one is considered broken, and why
• --check-strict reports changed, added, removed and unreadable …
since recently somebody asked me about the official #jarfix hash values ...
```
curl -s https://johann.loefflmann.net/downloads/jarfix-hashes.txt | jacksum -a sha256 -
77acd8cb4c52663c2875de551e081313e875a33bbcbebc6dea4aaab1e029e37b <stdi…
#CVE-2021-44832 (#log4shell): Find vulnerable .jar files by searching for #hashes with #Jacksum 3.4.0
See also https://loefflmann.blogspot.com/2022/06/CVE-2021-44832%20Find%20vulnerable%20.jar%20files%20using%20Jacksum%203.4.0%20or%20later…
#Jacksum File Browser Integration for #Linux and #Unix is ready to use at https://github.com/jonelo/jacksum-fbi-linux - it could help you to calculate and verify #hashes the graphical way. The file browsers #Caja, #Dolphin, #Konqueror, #Kr…
Pleased to announce #HashGarten - a #GUI for #Jacksum - see also https://github.com/jonelo/HashGarten and https://loefflmann.blogspot.com/2022/04/hashgarten-gui-for-jacksum.html
Oh, and just in case you have set #Security Headers at your Web Server, don't forget to adjust your Content Security Policy so that the images from #adoptium.net can be loaded properly. See also https://scotthelme.co.uk/content-security-po…
Eclipse Temurin Download Buttons are now available at https://adoptium.net/de/temurin/buttons/ to promote #Eclipse #Temurin.
Eclipse Temurin is the name of the #OpenJDK distribution from #Adoptium. Those free prebuild OpenJDK binaries are …
Pleased to announce #HashGarten - a #GUI for #Jacksum - see also https://github.com/jonelo/HashGarten and https://loefflmann.blogspot.com/2022/04/hashgarten-gui-for-jacksum.html
Oh, and just in case you have set #Security Headers at your Web Server, don't forget to adjust your Content Security Policy so that the images from #adoptium.net can be loaded properly. See also https://scotthelme.co.uk/content-security-po…
Eclipse Temurin Download Buttons are now available at https://adoptium.net/de/temurin/buttons/ to promote #Eclipse #Temurin.
Eclipse Temurin is the name of the #OpenJDK distribution from #Adoptium. Those free prebuild OpenJDK binaries are …
🐘 Community & instance
Home server
fosstodon.org
A open-source software server — its members and audience skew toward that niche, so expect a community-aligned, engaged following.
✅ 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
Apr 2022
An established account with real history on the platform.
💡 Facts
🗓️Joined Mastodon in 2022 — 4 years ago.
👁️Averages 3 views per post.
📤Posts about 0× per week.
🕵️ Fake follower check
Estimated83/100
Excellent
Credibility score
99%
Real
Real audience
Low
Fake-follower risk
Medium
Data confidence
- Est. 99% real, active audience · Low fake-follower risk.
- Strong engagement (~0.6× of followers engage each post) — an active, real audience.
- Verified account.
- Established account (4+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
I am a former Sun Microsystems and Oracle engineer. Today I work as a CISO. I am located in Munich, Germany.
In my spare time I enjoy #coding in #Java, #Pyhton and love to use #Claude.
I am the author of #NumericalChameleon, #Jacksum, #Jarfix, #HashGarten, #bashberries, #XMLHolidays and others. Many are #FOSS :-)
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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Frequently asked questions
How much does Johann N. Löfflmann charge for a sponsorship?
Johann N. Löfflmann hasn't published fixed prices yet. Send a proposal through SocialDB and agree terms directly — your payment is held in escrow until the work is approved.
How do I contact Johann N. Löfflmann for a brand deal or collaboration?
Send a paid deal or collab request right here on SocialDB — we notify Johann N. Löfflmann, and once they accept, your payment is held safely in escrow and released when the work is approved. You don't need to track down an email.
How many followers does Johann N. Löfflmann have?
Johann N. Löfflmann has 5 followers on Mastodon.
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