Volker

http://bitcoinbegreifen.de

Bitcoin translator, educator, communicator:
English ↔ German | Nerd ↔ Noob

Public Key

npub1g4jdvuxv9dgkcqtn5fupf2l9mr9xp27glzp6eq450dwfszrhfp9scxfm70

NIP-05 Address

volker@nostrplebs.com

NIP-57 Address

volker@getalby.com

Profile Code

nprofile1qqsy2exkwrxzk5tvq9e6y7q540ja3jnq40y03qavs268khycppm5sjcprpmhxue69uhhyetvv9ujumn0wd68ytnrdakjuct4qyt8wumn8ghj7un9d3shjtnswf5k6ctv9ehx2aq62eatc

Publishing to

relay.nostr.com.au

relay.primal.net

relay.nostr.bg

Author Public Key

npub1g4jdvuxv9dgkcqtn5fupf2l9mr9xp27glzp6eq450dwfszrhfp9scxfm70

Show more details

Last Notes

2025-06-04 20:33:45

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You won't believe this...
https://blossom.primal.net/8a77e33fd2c098f0d786d130778e8984040bb125054afaf656694fae7f6470ab.jpg

2025-06-01 10:09:54

Kann hier jemand ein Mittel gegen Unkraut empfehlen? Das Zeug wächst einfach wie verrückt...
https://image.nostr.build/2339300d1da2853da796b64d1b682b2e0f3cac97bf72b4a2d09643555c210141.jpg
https://image.nostr.build/ae0a98aa9937b2bc56309c5be5590807d8bc17f5f936381889d0ebe83b9264c7.jpg
https://image.nostr.build/436e604d7c633663ed6ca842e9983f419db6a74a96557df91c75156177193488.jpg

2025-06-01 09:51:00

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You could call it the 'ZapStore' 😅

2025-05-31 17:17:03

¯\_(ツ)_/¯
https://image.nostr.build/1ac1fbf7f43572c94fc611e5dc419972748dedbcf46971143ffb76af85011453.jpg
https://image.nostr.build/596afe7675663fa1f1bf82db7a27e52064ec0752df218223b48bb62019acb435.jpg

2025-05-28 08:00:33

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A $500 wrench 🔧

2025-05-28 07:54:04

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😅

2025-05-25 13:44:41

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Especially when you try to get the edges towards horizontal vs them being just a wet sack. The stress will be in the metric tons.

2025-05-25 13:08:10

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I'd like to try the bathtope, but no idea if my walls will collapse. And where the water will go if they collapse.

2025-05-23 12:35:42

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No idea. I aborted the upgrade. Probably some fucking rainbows…

2025-05-22 13:46:25

Falls es jemand noch nicht gemerkt hatte: jetzt ist es endgültig, amtlich und gerichtlich bestätigt 😁
https://image.nostr.build/c7b5a792649a6adf0f708e9c19d92410235cceacf3b30216232f4f7dbb5c216b.jpg

2025-05-21 16:03:59

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Please verify your identity by posting a selfie with a shoe on your head 😂

2025-05-20 15:59:51

GROK as it sees itself
https://image.nostr.build/fe0cd3528a671454716f59a5db62d4e31cbbccb3dc4b5290c72670fe520449f3.jpg

2025-05-20 11:36:24

GM
https://image.nostr.build/cc2a99f2c9e7a57df6ec2d704b49060209fb1ca56bfe34172af6a21b07b00ec4.jpg

2025-05-19 15:53:55

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Not sure where in the thread you saw anyone saying "a Bitcoin" ¯\_(ツ)_/¯

2025-05-18 23:58:03

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https://image.nostr.build/7645a7fde4fd787152330296661b593ce0c050ded2ec4e9260020a005ead6648.jpg

2025-05-18 17:18:11

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I'm using a Bitcoin based VISA card, so there's that.

2025-05-18 12:02:21

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You'll see that after day three it gets really good. But approach it at your own speed.

2025-05-18 11:18:00

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I did 9 days once. Not even mineral water, just tap water. That was clearly too much. I think a week is a sweet spot. Three days of forcing yourself through hunger, followed by four days of warm belly, plenty of time, and overall goid feelings. But energy drops after that. YMMV

2025-05-18 09:08:33

When you don't have private insurance but you finally get your MRT appointment.
https://image.nostr.build/7eb933664b6030db6afd636332c7eaf4aafb1c69e15bdb6fed9f48486ebec5a9.jpg

2025-05-18 08:28:23

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It gets mich easier after three days, and you'll have more time for your fiat mining, because no more meals.

2025-05-18 08:22:35

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Oopsie, they do appear. Sorry I was in 2020

2025-05-18 08:21:25

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Don't forget that tor nodes don't appear there, and that standard distros like mynode, umbrel or start9 default to tor

2025-05-17 20:42:21

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Oh, wow, you took your time. Just like some well known blue wolf 😅

2025-05-17 20:38:35

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That block was 9 years ago WTF?

2025-05-17 14:40:57

🎯
https://image.nostr.build/b16c571f34cf91d76ac5f2afecb1ef3b571bb83446385547ffac60c8f2664d28.jpg

2025-05-16 18:52:41

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Anyone on nostr on bro terms with him? @npub1sg6…f63m maybe?

2025-05-15 18:38:03

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Payloads over ~140 bytes are cheaper when encoded as witnesses, smaller ones cheaper as OP_RETURN.

2025-05-15 09:52:35

GM!
https://image.nostr.build/e19119dc0f958b791d088bfc112c012e3f241c26390c835e38a8aa99447b94a5.jpg

2025-05-13 18:50:12

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Talking about force in FOSS development kind of disqualifies you, you know.

2025-05-13 14:31:39

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That creates two problems:
- the ones creating the filters become a trusted and central authority and can subsequently be attacked by the state
- VCs can stay solvent longer than the ones who update the filters, can stay motivated

2025-05-13 14:01:39

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Interesting. So how do you filter a series of TXs using small OP_RETURN payloads, or payload as signatures, or payload as raw multisig, or payload as scripts, or payload as any of the new things that VC backed scammers can and will come up with, when forced?
Seriously interested. I just don't think there's a good answer.

2025-05-13 11:04:51

Get it?
https://image.nostr.build/38c7bb4ce1a972ecf3ac43c84377373c23beb0fc6ce728ae26001537c2913bc0.jpg

2025-05-12 12:24:25

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STOP SENDING ZAPTS MY WALLET WILL OVERFLOW I DON'T WANT MY BASEMENT FULL OF SATOSHIS!!

2025-05-12 12:17:07

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OH MAI GOHD NOW I GOT DOUBLE BACK, SO IT WAS NOT A SCAM, REJOICE!

2025-05-12 07:09:24

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OK I HAVE BOUGHT SOME BUT WHERE ARE THEY? I DON'T SEE ANY…?

2025-05-11 21:03:35

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BITCOIN IS TOO EXPENSIVE I CANNOT AFFORD $100,000!!!

2025-05-11 20:57:47

I looked up "abusive relationship" and found out it describes almost perfectly my relationship with the state - help 😅

2025-05-11 20:13:30

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It's a good idea, but a contradiction to his statement that value is subjective and hence, cannot be stored. But i'm sure he'll soon come up with a perfected phrase. (No pressure, Knut ☺️)

2025-05-11 13:26:59

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Good. So you've already learned the valuable skill of "Don't trust. Verify" (not to expect internet postings to be correct). That's a good start.
You can, and probably will, also learn that rehashing/copying what other people did, typically creates little value, while thinking/creating for yourself often does. Yes, it takes time, and sometimes it's hard and uncomfortable, but it's what works.
BTW you can easily deduce the veracity of the above. No prior knowledge required; just common sense.

2025-05-11 13:11:33

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Bullshit is easy to identify once you can reason logically. Which is the first thing one should learn.

2025-05-11 13:08:08

Every normal person, who is using their ALL-OF-HUMAN-KNOWLEDGE device for entertainment rather than for education, has lost all right to complain about their fate.

2025-05-11 11:22:05

From dvharry2020 on X
https://image.nostr.build/9a5df05fc3dcb07260d9f0a55b86e168d3357a595372fead901b1210c2d036c6.jpg

2025-05-08 09:55:33

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😃

2025-05-07 09:06:08

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So you're saying Muun is the only one that is actually usable, while the others will leave you wanting? 😆

2025-05-05 15:00:02

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Indeed. Here's the crucial point, from Grok: The Jacobian Matrix:
The matrix operation you're referring to is likely the **computation of the inverse kinematics Jacobian matrix** or the **forward kinematics transformation matrix**, both of which are critical in robotic joint control and can be computationally intensive. Let me clarify the key operation and its characteristics:
### Key Matrix Operation: Jacobian Matrix (and its Inverse)
The **Jacobian matrix** is central to robotic joint control, particularly for inverse kinematics, which maps desired end-effector velocities (or positions) to joint velocities (or angles). Here's a breakdown:
#### Characteristics of the Jacobian Matrix Operation:
1. **Purpose**:
- The Jacobian relates joint velocities (e.g., angular velocities of motors) to the end-effector's linear and angular velocities in Cartesian space.
- For inverse kinematics, the **inverse Jacobian** (or pseudo-inverse for redundant systems) is used to compute joint velocities or positions required to achieve a desired end-effector motion.
2. **Mathematical Form**:
- For a robot with $ n $ joints, the Jacobian is a $ 6 \times n $ matrix (6 rows for 3D linear and angular velocities, $ n $ columns for joint velocities).
- It is derived from the partial derivatives of the forward kinematics equations with respect to joint angles/positions.
- Example: For a manipulator, the forward kinematics gives the end-effector pose $ \mathbf{x} = f(\mathbf{q}) $, where $ \mathbf{q} $ is the joint configuration. The Jacobian is $ J = \frac{\partial f}{\partial \mathbf{q}} $.
3. **Computational Intensity**:
- **Forward Jacobian**: Computing the Jacobian involves calculating partial derivatives of the kinematic equations, which requires trigonometric functions (sines, cosines) and matrix multiplications for each joint. This scales with the number of joints and complexity of the kinematic chain.
- **Inverse Jacobian**: The inverse (or pseudo-inverse for non-square matrices) is significantly more intensive, requiring operations like singular value decomposition (SVD) or matrix factorization (e.g., LU or QR decomposition). For an $ n $-joint robot, the computational complexity of inversion is approximately $ O(n^3) $ for a square matrix, or higher for pseudo-inverses.
- **Real-time requirement**: Robotic control often requires updating the Jacobian and its inverse at high frequencies (e.g., 100–1000 Hz), making it computationally demanding, especially for robots with many degrees of freedom (DoF).
4. **Challenges**:
- **Singularities**: Near kinematic singularities (e.g., when joints align in certain configurations), the Jacobian becomes ill-conditioned, making inversion unstable or impossible without special handling (e.g., damped least-squares methods).
- **Redundancy**: For robots with more joints than required (redundant manipulators), the pseudo-inverse is used, which adds computational overhead.
- **Numerical Stability**: Repeated matrix operations can introduce numerical errors, requiring robust algorithms.
5. **Applications in Robotics**:
- **Inverse Kinematics**: Solving for joint angles/velocities to achieve a desired end-effector pose or trajectory.
- **Force/Torque Control**: Relating joint torques to end-effector forces via the Jacobian transpose.
- **Motion Planning**: Used in control loops for smooth, precise movements.
#### Alternative Operation: Forward Kinematics Transformation Matrices
While the Jacobian is often the most compute-intensive due to its role in real-time control, **forward kinematics** also involves matrix operations that can be significant:
- **Transformation Matrices**: Each joint’s position and orientation are computed using 4x4 homogeneous transformation matrices, which combine rotation and translation.
- **Characteristics**:
- Involves matrix multiplications for each joint to compute the end-effector pose.
- Requires trigonometric calculations (e.g., for rotation matrices based on joint angles).
- Less intensive than Jacobian inversion but still scales with the number of joints (approximately $ O(n) $ for $ n $ joints).
- Used in every control cycle to map joint states to Cartesian space.
#### Why These Operations Are Compute-Intensive:
- **High DoF**: Robots with many joints (e.g., humanoid robots or multi-arm systems) increase the size of matrices and the number of operations.
- **Real-Time Constraints**: Control loops demand low-latency computations, often on embedded hardware with limited processing power.
- **Nonlinearities**: Kinematic equations involve nonlinear trigonometric functions, and Jacobian inversion requires iterative or complex linear algebra techniques.
### Summary
The **Jacobian matrix** (and its inverse or pseudo-inverse) is the primary compute-intensive operation in robotic joint control, used for inverse kinematics and velocity mapping. It involves:
- A $ 6 \times n $ matrix for $ n $-joint robots.
- Partial derivatives of kinematic equations.
- Inversion complexity of $ O(n^3) $, plus challenges with singularities and numerical stability.
- High-frequency updates in real-time control.
If you meant a different operation (e.g., dynamics-related, like the mass matrix in the manipulator’s equations of motion), please clarify, and I can dive deeper!

2025-05-04 11:58:05

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Eine, in der mit £ bezahlt wird 😬

2025-05-04 08:51:17

GM! Bitte diese beiden heute nicht verwechseln!
https://image.nostr.build/cccf4efb449e8e8f8bee1c8131c926c31d53fa09c73fbcf59bc13680a5cb6fa6.jpg

2025-05-01 14:29:11

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And that is good, lest every bozo starts contributing code that may or may not work, or even wreak havoc. In other words, you need competence. Competence that you don't just attribute yourself with, but that is recognized by a group of people who have been showing high degrees of competence themselves. I.e. core maintainers.
And that is exactly the status quo.
I don't see what's difficult about this to understand.

2025-04-30 13:04:51

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Are you aware that you *could* in fact become one of this handful of ppl, or not?

2025-04-29 08:33:27

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👋

2025-04-28 09:12:28

GM once more
https://m.primal.net/Qfyg.jpg

2025-04-28 08:26:13

GM!

2025-04-27 22:17:26

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It's not

2025-04-27 16:42:02

Dude got killed posting 😅
#note1gsv…nazr

2025-04-27 16:39:57

This ⬇️
#nevent1q…9d8p

2025-04-27 15:22:17

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Ain't nobody got sats fo' thaaa…
https://image.nostr.build/dfbd0c17f756d8069528b2a01d3ea92866a8325551a2fbe845e3ab64e0072aeb.jpg

2025-04-27 12:43:10

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You sure you didn't meet MY friend? 😂

2025-04-27 09:47:22

BIP-177 info here: https://bitcoinerrorlog.medium.com/bip-177-for-dummies-3993db575490

2025-04-27 09:44:19

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True

2025-04-27 08:34:28

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GM, it seems like to you've become somewhat of a Windows fan... 😅

2025-04-26 20:28:57

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Good luck in your life, seriously. I'm afraid you're gonna need it.

2025-04-26 19:44:06

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Agree. But extracting value from FOSS is hard - in part because it's at least partially against the spirit of FOSS.

2025-04-26 19:35:00

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*coupling

2025-04-26 19:34:38

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BROKERING, as in couping the people with a certain idea with the people with the resources to execute it, is valuable.

2025-04-26 19:29:27

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Hard no. Ideas are a precondition, yes. But nobody pays for an idea, or I would be a multi-millionaire now.

2025-04-26 19:27:29

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No, because a thousand people have already had the same idea. They just didn't execute it.

2025-04-26 19:10:27

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Yes. Too many think that ideas are valuable. They aren't. Ideas are abundant and free. Execution is scarce and valuable.

2025-04-26 14:10:07

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rm -rf --no-root-preserve 😂

2025-04-26 10:55:27

GM raise your hand if you hate Whiskas
https://image.nostr.build/dfae3ad668d8393370014e8a12cb7ba9d97ea3c1381db3267037b2c4f794a2d1.jpg

2025-04-26 08:48:25

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Don't have a Unix computer handy. Can you execute the command without the final "| /bin/bash" and post it? Thanks

2025-04-25 11:11:31

H/t to @npub1m9y…yhzw
https://image.nostr.build/b00063932b048671ae3092c4c543b49e9b48c4359327e095f000959cb502123e.jpg

2025-04-23 17:59:12

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So why not 12?

2025-04-23 13:37:56

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Grok says I'm wrong about it being "to the right" on both hemispheres. Maybe my instructor was a dummy, or maybe I just got it wrong. Here's what Grok says:
As altitude increases, the wind's behavior is influenced by several atmospheric factors, primarily the **Coriolis effect**, **pressure gradient force**, and **friction** (or lack thereof). Here's why the wind gets stronger and shifts more "from the right" with height:
1. **Reduced Friction at Higher Altitudes**:
- Near the Earth's surface, friction from terrain (mountains, trees, buildings) slows down wind and disrupts its flow. As you move higher, this frictional drag diminishes significantly, especially above the planetary boundary layer (typically 1-2 km above the surface). With less resistance, winds can blow faster, leading to stronger wind speeds.
2. **Pressure Gradient Force Dominance**:
- Winds are driven by the pressure gradient force, which arises from differences in atmospheric pressure. At higher altitudes, the pressure gradient is less affected by surface features and becomes more pronounced, allowing winds to accelerate. This contributes to stronger winds as you sample at greater heights.
3. **Coriolis Effect and Wind Direction**:
- The Coriolis effect, caused by the Earth's rotation, deflects moving objects (including air) to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. Near the surface, friction counteracts some of this deflection, causing winds to flow more directly along the pressure gradient.
- At higher altitudes, with friction reduced, the Coriolis effect becomes more dominant. This causes the wind to align more closely with the geostrophic balance (a balance between the pressure gradient force and the Coriolis effect), resulting in winds that appear to come "more from the right" in the Northern Hemisphere. In the Southern Hemisphere, the shift would be "more from the left."
4. **Vertical Wind Shear**:
- The change in wind speed and direction with altitude is known as **wind shear**. As you move upward, the transition from surface-influenced winds to free-atmosphere winds (governed by geostrophic or gradient flow) results in both an increase in speed and a directional shift. This is often observed in weather systems like low-pressure systems, where winds spiral counterclockwise in the Northern Hemisphere and shift rightward with height due to the Coriolis effect.
### Example:
In the Northern Hemisphere, near the surface, a wind might blow from the southwest due to friction and pressure gradients. As you ascend, friction decreases, and the Coriolis effect pulls the wind more to the right, shifting it toward a westerly or northwesterly direction while also increasing its speed due to less resistance.
### Southern Hemisphere Note:
In the Southern Hemisphere, the Coriolis effect deflects winds to the left, so the wind would shift "more from the left" with increasing altitude, but the principles of reduced friction and stronger pressure gradient forces still apply.
This pattern is a fundamental feature of atmospheric dynamics and is critical in meteorology for understanding weather systems and forecasting. If you have specific conditions (e.g., a particular location or weather system), I can tailor the explanation further!

2025-04-23 13:31:05

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Don't ask me why; I can't explain it either. I learned it in flight school a looong time ago, and it just stuck as a fact. Might ask Grok one day.

2025-04-23 13:29:40

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The most important part to understand about "alternative" energies, or fuel-free energies, is that there is a vast abundance of energy, which means it's basically worthless. The value is not in capturing the energy, but in funneling it at the right time to the right place. That may include storing it. And fuel is stored energy, which is why uranium, oil & gas are expensive.
Because what you need isn't energy, it's power (energy/time). And matching power production to power need is really hard when you base it on something that you don't control (like the weather).

2025-04-23 13:26:03

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Correct. Coriolis. What's interesting is that it's "right" anywhere on earth, so in both hemispheres.

2025-04-23 13:25:01

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Is it over? Can I unmute him now?

2025-04-23 13:22:09

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Not same speed. Air and other gases behave like a liquid of very low viscosity. So the air ON the ground has a speed of zero, while the speed rises with every incremental unit (cm, inch, foot, whatever). The higher you are, the greater the wind speed. (And also, the more it comes from the right, but that is much harder to understand and explain).

2025-04-23 13:01:34

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Easy. When the rotor blade passes in front of the pole, there's a sudden reduction in pressure on the blade, causing a low frequency vibration in the whole mechanical system. This would be exacerbated, if at the same time, another blade would receive maximum pressure (being at the top).

2025-04-23 12:52:25

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I'll let the public be the judge. <muted>

2025-04-23 12:50:54

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So, what happened to you afterwards? Cause you're certainly not smart now.

2025-04-23 12:49:19

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As I said: behaving like a kid ¯\_(ツ)_/¯

2025-04-23 12:47:35

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Nah. You know. I know. And the guy who wants to know, behaves like a kid. Have a nice day, sir.

2025-04-23 12:42:56

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Aaaand that's where you lose my engagement. x92vbb was actually giving you a perfectly good explanation for why metal isn't a good material, and why glass (or carbon) fiber are the way to go, and you call it bullshit. GFY

2025-04-23 12:41:00

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Big ones need all sorts of approvals from the regulators. We DID roll out a huge bunch of large wind turbines in Germany recently. A lot of drawbacks: the landscape looks awful, it's a noisy mess, downstream the windmills the ground dries out, overproduction and reserve capacity make energy hideously expensive to the end user., and so on.
They need to be as high up as possible, because wind speed near the ground are relatively slow. That's why they get bigger every year. I'm sure they could efficiently be mass produced, even if they're hard to deploy because of said foundation (a huge heavy concrete slab to weigh the thing down), but I suspect the whole enchillada won't be as energy efficient overall.

2025-04-23 09:39:12

GM! Last night I started copying a bunch of huge folders (with lots of funny characters in file names) across a WAN tunnel. The tunnel broke down overnight, so the copy was interrupted in mid-flight.
Windows: clean up destination, restart from scratch
Linux: Might have a chance if you're REALLY REALLY good at shell, especially at quoting (spaces and special characters in file names are hell on steroids), but it'll take a long time to get it right-
macOS: "Wanna continue right now, or prefer later?"
I LOVE this system.
https://image.nostr.build/8892e1ebddd0fca9df50e0d5165fee27ead9895ae85a93fd0921e70015e8e0ff.jpg

2025-04-21 22:55:30

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Wow, Landquallen. Gute Nacht, Gigi!

2025-04-21 08:36:08

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And then zapping it. And then replying to it....

2025-04-21 08:35:39

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That skull 💀 is both of us. You writing the note and me looking at it 😳🥺

2025-04-21 07:57:52

GM! Rise and shine ✨ sun ☀️ mother of life.
https://image.nostr.build/de9caa701cbef5bf7cd6eaa982eb5c6ab5160733a51b265e68926b07016eaef0.jpg

2025-04-19 19:06:42

BFH Schreiben stellt Steuer- und Mitwirkungspflichten für Bitcoin klar. Tl;dr: alles bleibt für Privatpersonen so prima wie bisher 😃
https://www.haufe.de/steuern/finanzverwaltung/ertragsteuerrechtliche-behandlung-von-kryptowerten/steuererklaerungs-mitwirkungs-und-aufzeichnungspflichten_164_646654.html

2025-04-17 14:27:47

Choose which world you want to live in;
A) Everything divided by 21 million
B) Everything divided by media and politics

2025-04-17 09:11:15

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Indeed. I time traveled just last night. Woke up in the future eight hours later.

2025-04-17 09:07:47

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Mmmh shumai

2025-04-15 08:19:15

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GM!

2025-04-15 07:31:45

GM! Bitcoin core 29.0 has just been released and is available here: https://bitcoincore.org/bin/bitcoin-core-29.0/

2025-04-14 19:48:01

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It's not scaleable, it's tradeoffable

2025-04-14 19:44:13

Scott Bessent behind a golden chainsaw on Milei's table was NOT on my Bingo card for 2025
https://image.nostr.build/6bf4651c4d14c6a46f8386051698bff1f28505cdd049f03a510b350931fdb26d.jpg

2025-04-14 14:33:02

https://image.nostr.build/9cfdf871ad8e89779e90744cb1966b83500224fb5b1d0743c0c964a3e21252e3.jpg

2025-04-14 07:39:57

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With an emphasis on the *you*, it sounds sincere