Hendrik

Mathematician working in insurance.
Passion for #math, #coffee, #cats and #bitcoin.

Public Key

npub1jf0djkpn5uydafrrjmfswk75qmsajjzu5vyj8zlz77add6ewj0tq9v48xj

NIP-05 Address

Profile Code

nprofile1qqsfyhketqe6wzx7533ed5c8t02qdcwefpw2xzfr30300wkkavhf84spz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0ds5fdvqd

Publishing to

relay.damus.io

nos.lol

Author Public Key

npub1jf0djkpn5uydafrrjmfswk75qmsajjzu5vyj8zlz77add6ewj0tq9v48xj

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Last Notes

2025-10-18 16:11:08 UTC

Klausuren geschafft. Jetzt wird #steak gegessen

2025-10-10 19:21:13 UTC

Moin #Nostr und @nprofile…mszf Community!
Ich gebe Mathe-Nachhilfe und habe zurzeit noch freie Plätze - falls jemand was sucht oder jemanden kennt, der was sucht.
Kurz zu mir: Promovierter Mathematiker, Aktuar & Bitcoin Maximalist. Gebe seit Jahren leidenschaftlich Nachhilfe.
Lernen mit niedriger Zeitpräferenz:
• Kein Quick-Fix für die nächste Klausur, sondern echtes Verständnis aufbauen
• Ich bringe das "Lernen lernen" bei - Investment in die Zukunft
• Komplettes Lernsystem statt nur Stunden absitzen
Was dabei ist:
• 60 Min persönlicher Online-Unterricht/Woche
• Individuelle Lernplattform mit Übungen
• Support auch zwischen den Stunden
35€/Woche → 30€/Woche bei Zahlung in Bitcoin! ⚡
Passt am besten für Schüler ab Klasse 9, besonders Abi-Vorbereitung. Erste Stunde kostenlos zum Kennenlernen.
Bei Interesse einfach melden!
#Nachhilfe #Mathematik #Bitcoin #BitcoinMaximalist #LowTimePreference #LearningSats #einundzwanzig

2025-09-08 17:50:32 UTC

Why haven't I seen this #github repo earlier: https://github.com/casact/chainladder-python
Open, source #python reserving #actuary software package. I have a real need for this. Will integrate this into my projects. Maybe I can also #contribute

2025-08-24 13:55:13 UTC

Ludwig Erhards Verständnis der #sozialen #Marktwirtschaft
Etwas anders als der heutige Gebrauch ...
https://blossom.primal.net/0d945a79b0a51d02be9f60e514d877a36117f888a633f1402ca605b858fe9a09.png

2025-08-20 20:41:56 UTC

Looking for new #newsletters, #blogs or #feeds. Signal, not noise. #Bitcoin is always good, but also open to other recommendations. What's your favourite?
Thanks to all of you!
#askstr #helpstr

2025-08-08 07:44:32 UTC

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Genau die Leute, die dann später heulen und Enteignung fordern ...

2025-08-06 11:23:31 UTC

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Bought again my #coffee beans with lightning a few moments ago. Works like a charm and I help the owner to stack sats.

2025-08-06 11:18:13 UTC

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*Own

2025-08-06 11:17:51 UTC

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On my way to become independent by leveraging my expertise.
One boss thing seems tempting but I do not want to sacrifice my flexibility and time for it. But on my way to find out how to do it

2025-08-04 07:41:40 UTC

I really love my job!
Great flexibility, difficult problems to solve, seeing real world impact and having a great boss who trusts me and allows me to do things "my way" and develop my own initiatives.
#sharinggratitude #work #life #maths

2025-06-26 07:50:47 UTC

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Update: The update failed after 30 min ...
I want my #linux back

2025-06-26 07:29:19 UTC

#Windows build-in automated break feature ...
https://blossom.primal.net/7a39ba2580b11ed1aee6907cbaa7d27e56d173cebcbff13b6010983883c75d67.jpg

2025-06-19 07:48:52 UTC

Today, I am aiming to replace #powerbi with #dash

2025-06-19 05:58:49 UTC

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At the end of each working day …
#linux #foss #superior #freedom
#nevent1q…ccsp

2025-06-12 15:34:13 UTC

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Anyone a link to the full second part? I get: "This video is no longer available due to a copyright claim by a third party" for the original.

2025-06-11 20:54:41 UTC

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Congrats!

2025-06-08 07:43:02 UTC

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Nothing wrong with her. Just her normal posture 😅

2025-06-07 10:55:55 UTC

Topped up my #selfhosted #albyhub conveniently using the build-in swap functionality provided by #boltzexchange. The whole process just took a few minutes as I triple checked the correct bitcoin address.
Use the low mempool fees.

2025-06-03 11:15:40 UTC

Spend your #Bitcoin. But replenish your stack afterwards (if some fiat left)

2025-05-28 18:00:05 UTC

Finally ordered a new bike. Now the summer can come.

2025-05-21 21:02:53 UTC

https://calc.bitcoineracademy.com

2025-05-16 06:20:12 UTC

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Wow. What a dream 😍
#nevent1q…fme5

2025-05-15 07:45:12 UTC

It is addicting. Second try with #superproductivity. First one was not that smooth. But now with the new #kanban boards, the app is amazing. And further, it is local first and #opensource. Will look into implementing the features I need. (When I have time.)
https://blossom.primal.net/3223e4d99d5b4d8c7ac287c3fb5ccc6c8dc225126b0c4830351111cefad4e00f.png

2025-04-11 19:11:08 UTC

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Autsch
#nevent1q…a55k

2025-03-29 07:21:31 UTC

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Je nach Sorte zwischen ~13k (10€) und ~19k (15€) sats für 250g.
Nicht der günstigste, aber für die Qualität angemessen.
Der Kaffee vor Ort schmeckt auch super 😉

2025-03-28 14:31:13 UTC

Bought with #bitcoin in #hannover at my local bitcoin merchant at 171kaffeeladen
https://m.primal.net/PwLq.jpg

2025-03-27 15:35:21 UTC

But who would build #roads without a #state?
See how it worked for private railroads
#privatization #rothbard
https://m.primal.net/PvLX.png

2025-02-26 07:05:25 UTC

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For pure fluid flows it is in Eulerian coordinates. However, a Lagrangian PoV is included if we look at fluid-structure interaction. For this, we use an Arbitrary Lagrangian Eulerian (ALE) formulation.
What is your approach?

2025-02-25 09:47:19 UTC

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Applied mathematician here 👋
If you need someone to simulate a fluid flow around a cylinder using reduced order models, then I'm your man 😅

2025-01-29 21:21:40 UTC

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This is just beautiful to see

2025-01-29 08:51:53 UTC

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I hate this #EU kindergarten
#note1jfc…vkvz

2025-01-26 00:28:32 UTC

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FYI
#nevent1q…m52w

2025-01-18 18:26:35 UTC

Brief but very precise description of the insurance crisis in California and its state-created causes
#insurance
https://soundcloud.com/misesmedia/no-climate-change-is-not-causing-californias-insurance-crisis

2024-12-29 09:13:50 UTC

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Besonders krass finde ich die #Enteignung verwaister Girokonten.
Ein Schlag ins Gesicht der #Eigentumsrechte.
#nevent1q…2h8c

2024-12-29 09:11:39 UTC

Für #sozialismus wähle #grün
#socialismsucks #socialism #germany #deutschland
https://youtu.be/8PfTfnejN9s

2024-12-26 10:55:10 UTC

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With #bitcoin you can just say fuck you to the rat race and the expectations of others
Truly liberating

2024-12-24 12:38:55 UTC

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There will be a BitBox under the Christmas tree this year 🎄

2024-12-24 12:36:20 UTC

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Simply wow!

2024-12-21 09:29:35 UTC

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Moin! Heute gehts ins Planetarium Sterne gucken

2024-12-15 17:46:04 UTC

Amazing performance by the narrator Patrick Smith. Goosebumps while listening. Thanks @nprofile…cr20 for the recommendation, the book was exceptional.
#bookstr #books #reading
https://www.audible.de/pd/Most-Dangerous-Superstition-Hoerbuch/B0886GRFWB

2024-12-15 08:54:06 UTC

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Stärkster Kandidat mit 29% ist "Keiner von den vieren".

2024-12-12 09:06:57 UTC

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enjoy it, it is a very nice read

2024-12-12 09:06:15 UTC

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#moin

2024-12-11 06:22:42 UTC

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#gm
#note1q2k…vxq6

2024-12-10 15:39:31 UTC

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Hätte ich früher mal mehr gezockt ...
#nevent1q…rhpd

2024-12-10 07:17:16 UTC

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Thrilled to observe the #nostr development
#nevent1q…2hul

2024-12-07 21:49:52 UTC

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THIS IS HUGE!!!
#nevent1q…mtj9

2024-12-06 22:43:43 UTC

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Looking forward to the Christmas holidays to enjoy long days of reading
#note1yyy…3a8j

2024-12-02 21:38:24 UTC

Sehr hörenswerter #nostr talk @npub1qv0…ujnc
https://anchor.fm/s/d8d3c38/podcast/play/95260529/https%3A%2F%2Fd3ctxlq1ktw2nl.cloudfront.net%2Fstaging%2F2024-11-2%2F3830cf9e-fd77-34c8-d1ae-65e6c2b76bff.mp3

2024-12-01 07:04:18 UTC

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Sehr coole Aktion vom @nprofile…cr20!
#advent #libertarianism
#nevent1q…fl40

2024-11-28 21:33:57 UTC

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Hört sich spannend an. Kann die Ausgabe auch mit Bitcoin bezahlt werden?

2024-11-27 08:09:52 UTC

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#twitter is the biggest shithole. Got suspended with an account I use just read-only. Tried it out a few weeks ago and am even happier afterwards that #nostr exists.

2024-11-19 20:34:44 UTC

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Directly added to Queue 💪

2024-11-19 20:32:08 UTC

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What the fuck ...

2024-11-12 09:01:28 UTC

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Nice

2024-11-07 21:42:15 UTC

Back to #nostr (and only #nostr) after two weeks of abstinence from any social media

2024-10-23 11:37:56 UTC

Strongs words from Murray Rothbard
https://image.nostr.build/5a643ad8d5cefb96adbe2a91ea1841b6b19b690200900346b83f494d19d9480b.jpg
#bookstr #quote

2024-10-21 17:09:50 UTC

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What a perfect argument for #bitcoin
A swiss bank account in your pocket 💪
#nevent1q…wj9q

2024-10-21 12:42:27 UTC

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Congrats

2024-10-21 12:41:08 UTC

#bitcoin is my FUCK YOU money

2024-10-19 06:44:03 UTC

Mit einem herzhaften Frühstück schön in das Wochenende starten 😍
#gm

2024-10-17 16:00:39 UTC

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Or simply choose #linux if #privacy and control matter to you.
#nevent1q…elgl

2024-10-16 07:38:15 UTC

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No bad idea 😅

2024-10-16 07:20:14 UTC

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Merde

2024-10-16 07:09:39 UTC

Reading every day before starting to work has a great influence on personal growth while at the same time providing peace of mind in the morning.
#peace #books #reading #bookstr #gm

2024-10-15 14:58:30 UTC

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Reading books is part of the cure
#books #reading #bookstr
#nevent1q…ju2j

2024-10-14 14:51:41 UTC

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There is no second best
#bitcoin
#nevent1q…8h03

2024-10-11 07:46:58 UTC

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Habe ich bei meinen Schwiegereltern auf den alten Laptop aufgesetzt. Den beiden ist nicht einmal aufgefallen, dass etwas anders ist als in Windows ...

2024-10-11 07:10:28 UTC

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Definitiv. Und sobold PopOs zu heavy ist, kommt was leichteres drauf. So kann das noch ein paar Jahre weiter gehen.

2024-10-11 07:09:08 UTC

Ich freue mich jedes Mal, wenn ich deutsche Notes auf #nostr sehe

2024-10-08 11:51:42 UTC

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Mein "alter" PC mit einem i5 7600k läuft unter Pop!_OS noch wie am ersten Tag. Fuck Microsoft. Unter Linux läuft der PC bis er wegen Altersschwäche schlapp macht.

2024-10-08 07:00:55 UTC

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Hate this too!
As a workaround to this shit copy the YT link to NewPipe or FreeTube on Android and Linux, respectively.

2024-10-04 13:00:16 UTC

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Started from scratch. Just had the block chain to sync again.
But I think you can just copy the data to the new one using another computer

2024-09-22 10:05:19 UTC

Creepy.
Happy that I can at least disable 2G on #grapheneos
But still ...
https://www.youtube.com/watch?v=wVyu7NB7W6Y

2024-09-20 22:40:35 UTC

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Ultra bullish. The only thing I use and it feels great.
The boredom when not constantly bombarded with BS and junk gives inner peace.
#nostronly #nostr
#nevent1q…d57l

2024-09-20 19:46:54 UTC

Hab ich das richtig verstanden, dass man schon mit 5.500 Brutto nächstes Jahr mehr als 150€ netto weniger hat?
Wie viel wollen die mich denn bitte noch abschröpfen?
Sollen sich nicht wundern, wenn die Leute aus Deutschland flüchten.
@nprofile…w0la @nprofile…7p43
#steuernsindraub

2024-09-19 11:13:48 UTC

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How to save for your child or godchild in the world's best money #bitcoin
#bitcoinissaving #generationalwealth
#nevent1q…xm79

2024-09-19 08:32:27 UTC

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Similar situation for me. My approach will most likely be:
1. Buying a Card Wallet (40 bucks)
- https://www.cardwallet.com/en/home/
- would take it into custody until the child is old enough
2. Choosing a Bitcoin exchange with auto wallet transfer, e.g., 21bitoin https://21bitcoin.app/en/feature/auto-wallet-transfer
- setting it high enough to avoid unspendable UTXOs (few hundred bucks?)
- connecting to Card Wallet
3. Monthly DCA of 10–20 bucks
Thus, I have my normal DCA and everything else is automatically done. I only have to store the Card Wallet safely.
Any thoughts on that @npub199z…mqx8?

2024-09-19 08:09:25 UTC

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Would be also interested in a good answer to this
#helpstr #bitcoin4toddlers
#nevent1q…02fe

2024-09-18 13:41:24 UTC

#test

2024-09-18 09:49:00 UTC

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Waiting for my @nprofile…ca68 full node to finish the initial blockchain sync 😅

2024-09-16 20:46:45 UTC

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https://m.primal.net/KsCc.mp4

2024-09-16 07:31:27 UTC

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Scientific research and its results founded by the tax payers have to be open and free!
#nevent1q…uukk

2024-09-16 07:30:13 UTC

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+ Libregen/libgen if you need books that are not on scihub.
There is also a Zotero Plugin for Scihub 😉

2024-09-16 06:33:54 UTC

GM!
CBDC: Central Bank Direct Control
@npub1p2p…6rap @npub1pzc…0wlx @npub1xht…aydc
#plebrap #gm
https://www.plebrap.de/.cm4all/uproc.php/0/Cancel-Bank-Direct-Control-Too-Bit-To-Fail-feat.-JustAnotherNode.mp3?cdp=a&_=18e0e85aa60

2024-09-15 19:27:51 UTC

Switched to HeliBoard on #grapheneos as my daily driver.
First impression is quite nice!
Used OpenBoard before and experience of HeliBoard is much smoother.
#privacy #keyboard #android
https://github.com/Helium314/HeliBoard

2024-09-15 18:13:54 UTC

I should reduce the number of subscriptions I am paying for ...

2024-09-15 18:12:19 UTC

https://www.youtube.com/watch?v=_O4USnBANJ8

2024-09-15 15:49:13 UTC

Nala wants to talk
https://image.nostr.build/03a8262795d7865b340e9997cf91ea189981c34a304738104a3a9ce70f80ea18.jpg
#catstr #gm

2024-09-15 10:07:12 UTC

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Me with my full node's initial sync ...

2024-09-15 08:56:09 UTC

Rewatched Human B. Amazing work! Must watch.
#humanb #bitcoin
https://www.youtube.com/watch?v=RFSBWrAllzw&t=1

2024-09-14 07:26:34 UTC

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In this turn, you can start from deleting Google from your life altogether.
#degoogle #freeyourself

2024-09-14 07:24:26 UTC

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Mandatory! Or switch to ente Auth.
Yes, it is cloud based, but also #FOSS and secure

2024-09-13 13:41:29 UTC

test #test

2024-09-13 09:50:11 UTC

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Nina Warnapp gar nicht ausführbar auf #Grapheneos
Ich verstehe immer noch nicht, wieso Apps finanziert durch Steuermittel nicht FOSS sein müssen ...

2024-09-12 13:48:38 UTC

Wow, switched to a SSD in my @npub1agh…mhct setup.
Like day and night! Why have I waited so long to update from HDD 😵

2024-09-12 11:05:35 UTC

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Ich meine schon, dass genug Forschung und Tools zum Monitoring des Brückenzustands existieren.
Wahrscheinlich auchgenuhg open-source im easy ein numerisches Modell oder digital Twin aufzustellen.
Aber ja, das wäre wieder Digitalisierung und wir leben ja in Deutschland...
Außerdem fehlt skin in the game, sodass sich niemand verantwortlich fühlt, sich drum zu kümmern.
Aber ja, wer würde ohne Staat die Brücken bauen?

2024-09-11 20:40:33 UTC

#gn and sweet dreams

2024-09-11 20:32:11 UTC

First time using @npub18m7…q955. I can't find the setting to change the app language.
Can someone help me quickly?
#helpstr

2024-09-11 14:23:15 UTC

If you wish to be a writer, write. - Epictetus
Just a reminder to myself when procastinating on my PhD dissertation.
#justwrite