Difference between revisions of "Macsys Holding BV"

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== 3d Printing [2006-2011] ==
+
== Company ==  
−
[[File:valkbouwmanlaan.jpg|thumb|450px|''Macsys's pilot project; 3d printed house on wooden pedestal. Details are in the 0.8-1mm range, layer step size is 0.2mm'']]
 
−
'''Macsys''' was founded as a [https://en.wikipedia.org/wiki/General_partnership General Partnership] (Dutch V.O.F.) on 13 October 2006 by André Schalkwijk and Marcel Alfons.  The name '''Macsys''' is inspired by CAM software [https://en.wikipedia.org/wiki/Cimatron Cimatron], where MACSYS stands for Machine Coordinate System. '''Macsys''' uses [https://en.wikipedia.org/wiki/SketchUp SketchUp] software to transform architectural 2d drawings into 3d surface models. The 3d surface models are fed into [https://en.wikipedia.org/wiki/Z_Corporation Z-Corp] printers to create tangible solid models or [https://en.wikipedia.org/wiki/Maquette maquettes]. Z-Corp printers use [https://en.wikipedia.org/wiki/Inkjet_technology inkjet-technology] to create full color models, making them ideal for visualization.
 
  
−
Traditionally, [https://en.wikipedia.org/wiki/Architectural_model architectural models] are handmade using various materials. These materials have a look and feel that is close to the finished building, something that can not be achieved with 3d printing. The benefit of 3d printing is speed. A virtual 3d model is created faster and in finer detail then hand crafted models, especially if the building design is available digitally. Because 3d printed models are build up in layers, the surface finish is inferior to traditional models. The surface finish however can be improved by sanding or bead blasting.
+
Macsys was founded as a [https://en.wikipedia.org/wiki/General_partnership General Partnership] (Dutch V.O.F.) on October 13, 2006. The name Macsys is inspired by CAM software [https://en.wikipedia.org/wiki/Cimatron Cimatron], where MACSYS stands for MAchine COordinate SYStem. Macsys Engineering B.V. and Macsys Holding B.V. are founded May 22, 2012, replacing the existing partnership structure. In 2019 Macsys Engineering BV activities have all been transferred to Macsys Holding BV.
  
−
<gallery mode="packed" heights=160px>
+
== Experience ==
−
File:2dscan-achtergevel.jpg|''scanned 2d drawing''
+
 
−
File:Iso backandfloorplan.jpg|''ISO-view of both facade- and floor-plan in SketchUp''
+
[[File:Rel.jpg|centre]]
−
File:Isoback-buildup.jpg|''constructing the 3d model with push-pull tools''
 
−
File:Final detail.jpg|''finalized 3d model including shadow and sketched lines effect''
 
−
</gallery>
 
  
 +
== 3d Printing [years 2006-2008] ==
  
 +
'''Macsys''' uses [https://en.wikipedia.org/wiki/SketchUp SketchUp] software to transform architectural 2d drawings into 3d surface models. The 3d surface models are fed into [https://en.wikipedia.org/wiki/Z_Corporation Z-Corp] printers to create tangible solid models or [https://en.wikipedia.org/wiki/Maquette maquettes]. Z-Corp printers use [https://en.wikipedia.org/wiki/Inkjet_technology inkjet-technology] to create full color models, making them ideal for visualization.
  
 +
Traditionally, [https://en.wikipedia.org/wiki/Architectural_model architectural models] are handmade using various materials. These materials have a look and feel that is close to the finished building, something that can not be achieved with 3d printing. The benefit of 3d printing is speed. A virtual 3d model is created faster and in finer detail then hand crafted models, especially if the building design is available digitally. Because 3d printed models are build up in layers, the surface finish is inferior to traditional models. The surface finish however can be improved by sanding or bead blasting.
  
 +
Macsys pilot project (non-commercial) involved CAD modelling and printing of a 1930's house located in [https://nl.wikipedia.org/wiki/Woerden Woerden]. The printed house is glued on a wooden pedestal. This model was used as proof-of-concept and a demonstration project for potential customers.
  
 
The ''first'' commercial project for Macsys was creating a colored 1:50 scale model of a villa in [https://nl.wikipedia.org/wiki/Dronten Dronten]. Details include; tiled roof, water drainage pipes and [https://en.wikipedia.org/wiki/Muntin muntin] windows. At the time of modeling this project, there was no 'shell function' available in SketchUp, meaning that creating the correct wall thicknesses had to be done manually. A very tedious and time-consuming task, which is fully automated in most solid modelers.                     
 
The ''first'' commercial project for Macsys was creating a colored 1:50 scale model of a villa in [https://nl.wikipedia.org/wiki/Dronten Dronten]. Details include; tiled roof, water drainage pipes and [https://en.wikipedia.org/wiki/Muntin muntin] windows. At the time of modeling this project, there was no 'shell function' available in SketchUp, meaning that creating the correct wall thicknesses had to be done manually. A very tedious and time-consuming task, which is fully automated in most solid modelers.                     
Line 20: Line 19:
 
Macsys's ''third'' model was a challenge in terms of detailing. The unique house design includes an elevation, round  structure, high detail stairs, pillars and balcony. Since printed models are relatively weak, scaling was done non-uniform, so that the finer details are printed somewhat bigger and are thus stronger.
 
Macsys's ''third'' model was a challenge in terms of detailing. The unique house design includes an elevation, round  structure, high detail stairs, pillars and balcony. Since printed models are relatively weak, scaling was done non-uniform, so that the finer details are printed somewhat bigger and are thus stronger.
  
−
<gallery mode="packed" heights=160px>
+
After the first projects were successfully launched, demand for models increased. That is why Macsys partnered with a SketchUp modeling firm based in Thailand. This allowed Macsys to increase its design capacity and take on more work and more challenging projects.
−
File:Dronten3-2.jpg|''project 1: villa in Dronten, Netherlands - modeled November 2006''
+
 
−
File:Mension3d-exploded.jpg|''project 2: exploded view of mansion - modeled November 2006''
+
=== Gallery ===
−
File:2d side.png|''project 3: blueprint elevated round house''
+
 
−
File:Printedmodel.jpg|''project 3: printed model of elevated round house - printed January 2007''
+
<gallery mode="packed-hover">
−
File:Hogerijndijk.jpg |''project 4: apartment building, Hogerijndijk, Woerden, Netherlands - modeled January 2007''
+
Image:valkbouwmanlaan.jpg
 +
Image:Dronten3-2.jpg
 +
Image:Mension3d-exploded.jpg
 +
Image:2d side.png
 +
Image:Printedmodel.jpg
 +
Image:Hogerijndijk.jpg
 +
Image:Iso2.jpg
 +
Image:AllParts-Final.jpg
 +
Image:SAM.jpg
 +
Image:Macsys-Soest.jpg
 +
Image:070403-Denekamp-W30.jpg
 +
File:2dscan-achtergevel.jpg
 +
File:Iso backandfloorplan.jpg
 +
File:Isoback-buildup.jpg
 +
File:Final detail.jpg
 
</gallery>
 
</gallery>
  
 +
== Engineering Service [years 2008 - Current] ==
 +
 +
=== Gallery ===
  
 +
<gallery mode="packed-hover">
  
−
After the first projects were successfully launched, demand for models increased. That is why Macsys partnered with a SketchUp modeling firm based in Thailand. This allowed Macsys to increase its design capacity and take on more work and more challenging projects.
+
Image:Dutch_Boxer_Commando_Post.jpg
 +
Image:Horse2.jpg
 +
Image:QuickreleaseV2.gif
  
−
<gallery mode="packed" heights=160px>
 
−
File:Iso2.jpg|''special six piece model of villa - modeled February 2007''
 
−
File:AllParts-Final.jpg|''double housing plan with parking basement''
 
−
File:SAM.jpg|''Safety Always Matters (SAM), 3d surface model and printed result''
 
−
File:Macsys-Soest.jpg|''apartment building, Weegbreestraat, Soest, Netherlands''
 
−
File:070403-Denekamp-W30.jpg|''multi print maquette, zorgwoningen, Denekamp, Netherlands - modeled April 2007''
 
−
 
 
</gallery>
 
</gallery>
  
−
== Engineering Calculations ==
+
== Product Development [years 2008 - Current] ==
 +
 
 +
=== Dip-Clip ===
 +
 
 +
The Dip-Clip® logo is a registered trade mark at the [https://www.boip.int/en The Benelux Office for Intellectual Property].
  
−
[[File:12-1 - Copy.PNG|thumb|400px|''Rectilinear Kinematics, Continues motion'']]
+
<gallery mode="packed-hover">
 +
 
 +
Image:Dip-clipk_small.png
 +
Image:Prototype.JPG
 +
 
 +
</gallery>
 +
 
 +
=== BandRec App ===
 +
 
 +
[https://apps.apple.com/us/app/bandrec-lite/id1612433097 BandRec Lite]
 +
 
 +
[https://apps.apple.com/us/app/bandrec-pro/id1612436155 BandRec Pro]
 +
 
 +
[https://www.bandrec.nl BandRec Website]
 +
 
 +
<gallery mode="packed-hover">
 +
 
 +
Image:bandrec.PNG
 +
 
 +
</gallery>
 +
 
 +
 
 +
*
 +
 
 +
== Engineering Calculations - Manual ==
 +
 
 +
[[File:Manual calculation.JPG|thumb|400px|''Manual Engineering Calculation'']]
  
 
=== Mechanics of Materials ===
 
=== Mechanics of Materials ===
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 +
*
  
 +
== Engineering Calculations - Mathcad ==
  
 +
[[File:12-1 - Copy.PNG|thumb|400px|''Rectilinear Kinematics, Continues motion'']]
  
 +
[https://en.wikipedia.org/wiki/Mathcad Mathcad] is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations and was developed by [https://en.wikipedia.org/wiki/Mathsoft Mathsoft]. Mathcad has [https://en.wikipedia.org/wiki/WYSIWYG WYSIWYG] functionality, which is a big advantage over the 'hidden' and 'text based' formulas used in [https://en.wikipedia.org/wiki/Microsoft_Excel Microsoft Exel]. Macsys uses Mathcad Client 2001 for making and reporting engineering calculations. A practical starters guide for learning Mathcad can be found [http://homepage.physics.uiowa.edu/~rlm/mathcad/mathcad%20tutorial.htm here].
  
  
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−
---
 
  
−
== Mathcad ==
 
−
[https://en.wikipedia.org/wiki/Mathcad Mathcad] is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations developed by [https://en.wikipedia.org/wiki/Mathsoft Mathsoft]. Mathcad is relatively easy to learn and has [https://en.wikipedia.org/wiki/WYSIWYG WYSIWYG] functionality, which is a big advantage over the 'hidden' and 'text based' formulas used in [https://en.wikipedia.org/wiki/Microsoft_Excel Microsoft Exel]. Unfortunately Mathcad was purchased by [https://en.wikipedia.org/wiki/PTC_(software_company) PTC] and as a consequence became less accessible, more expensive, more bulky - but - still superior compared to Microsoft Exel. Macsys uses Mathcad Client 2001 for making and reporting engineering calculations. A practical starters guide for learning Mathcad can be found [http://homepage.physics.uiowa.edu/~rlm/mathcad/mathcad%20tutorial.htm here]. [[More on Mathcad...]]
 
  
  
−
=== Mathcad Calculations ===
 
−
 
−
[https://macsys.nl/mediawiki_02/mathcad/lifetime%20performance%20and%20reliability.html Lifetime performance and Reliability]
 
−
 
−
[https://macsys.nl/mediawiki_02/mathcad/compoundtubecalculation.html Compound Tube Calculation]
 
−
 
−
[https://macsys.nl/mediawiki_02/mathcad/optimization.html Optimization Calculation]
 
−
 
−
== Projects ==
 
−
Macsys Engineering B.V. and Macsys Holding B.V. are founded May 22, 2012, and replaced the existing V.O.F. structure.
 
−
 
−
=== Dip-Clip® ===
 
−
[[File:Dip-clipk_small.png|right|thumb|400px|french fries scoop packaging]]
 
−
 
−
The Dip-Clip® logo is a registered trade mark at the [https://www.boip.int/en The Benelux Office for Intellectual Property].
 
  
  
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*
 
*
  
−
=== Boxer PWV ===
+
== SimWise4D ==
−
[[File:Dutch_Boxer_Commando_Post.jpg|thumb|400px|Dutch Boxer Commando Post]]
+
[[File:Simwise4d-arm.JPG|thumb|400px|Simwise 4D integrates motion with FEA]]
−
[https://en.wikipedia.org/wiki/Boxer_(armoured_fighting_vehicle) Boxer armored fighting vehicle]
 
−
 
 
  
 +
[https://www.design-simulation.com/SimWise4d/ SimWise 4D] was born when [https://www.design-simulation.com/Corporate/Profile DST] acquired a license from MSC Software Corporation to the MSC.visualNastran 4D (vn4D) product. The software traces its roots to the [https://en.wikipedia.org/wiki/Working_Model Working Model] 3D product developed by Knowledge Revolution, which was acquired by MSC in 1999, extended to include FEA capabilities, and renamed Working Model 4D. It has found tens of thousands of users among engineering professionals, students, and educators. In December 2020 Macsys Holding BV acquired a perpetual licence from DST for the use of SimWise 4D software.
  
  
 +
=== SimWise4D demo files ===
  
 +
Various FEA bonding options in Simwise 4D ➡ [https://www.bandrec.nl/SimWise4D%20-%20Bonding.rar download]
  
  
  
 +
'''''More on [[SimWise 4D]]...'''''
  
  
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−
*
 
  
−
=== BandRec App ===
 
  
−
[https://apps.apple.com/tt/app/bandrec/id1516498172?ign-mpt=uo%3D2 BandRec - Automatic Recording App]
 
−
[[File:bandrec.PNG|thumb|900px|BandRec App]]
 
  
  
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 +
*
  
 +
== Simulations & Animations ==
  
 +
=== Gallery ===
  
 +
<gallery mode="packed-hover">
  
 +
Image:Genevawheel_animation.gif
 +
Image:Intermittingmotion.gif
 +
Image:Rotationalcam.gif
 +
Image:Scotchyoke.gif
 +
Image:Variable-quick-drop.gif
 +
Image:Ratched.gif
 +
Image:Platecam21.gif
 +
Image:Platecam-B.gif
  
 +
</gallery>
  
  
 +
'''''More on [[Simulations & Animations]]...'''''
  
  
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*
 
*
 +
== CAD, Kinematic simulations and FEM video's by Macsys==
  
−
== Simulations & Animations ==
+
[https://www.youtube.com/@macsys_engineering CAD Speedrun challenge]
−
<gallery mode="packed">
 
−
File:Genevawheel_animation.gif|''Geneva wheel, model created and animated in [https://en.wikipedia.org/wiki/Siemens_NX NX6]''
 
−
File:Intermittingmotion.gif|''intermitting motion gears, model created and animated in [https://en.wikipedia.org/wiki/Siemens_NX NX6]''
 
−
File:Rotationalcam.gif|''cam follower, model created in [http://www.spaceclaim.com/en/default.aspx SpaceClaim] and animated in [https://en.wikipedia.org/wiki/Siemens_NX NX6]''
 
−
File:Scotchyoke.gif|''scotch yoke, model created and animated in [https://en.wikipedia.org/wiki/Siemens_NX NX6]''
 
−
File:Variable-quick-drop.gif|''variable quick drop, model created and animated in [https://en.wikipedia.org/wiki/Siemens_NX NX6]''
 
−
File:QuickreleaseV2.gif|''quick release soap connector for [https://mmid-group.com/ MMID], model created and animated in [https://www.solidworks.nl/ SolidWorks]''
 
−
File:Ratched.gif|''double wheel ratched, model created and animated in [https://en.wikipedia.org/wiki/Siemens_NX NX6]''
 
−
</gallery>
 
−
 
 
−
[[File:Genevawheel_animation.gif|center]]
 
  
 +
== Relations ==
  
−
Above mechanisms are derived from the books [https://www.amazon.com/Ingenious-Mechanisms-Designers-Inventors-Set/dp/0831110848 Ingenious Mechanisms for Designers and Inventors.]
+
[https://www.facebook.com/profile.php?id=100063619507899 Almost Famous Band]
  
−
== Partnerships & Investments ==
 
 
[https://etergo.com/ Etergo - Smart Electric Scooter]  
 
[https://etergo.com/ Etergo - Smart Electric Scooter]  
  
−
[https://www.hycube.com/en/ Hycube - Engergy Storage]  
+
[https://www.yuiop.nl/ Yuiop - App Development]
 +
 
 +
[https://www.aesc.nl/ AESC - Software]
  
−
[https://www.yuiop.nl/ Yuiop - BandRec App Development]
+
[https://www.electricdutchman.com/#section0 Electric Dutchman Scooter]
  
−
== Clients ==
 
 
[https://mirrorcontrols.com MCi - Mirror Controls International]
 
[https://mirrorcontrols.com MCi - Mirror Controls International]
  
Line 221: Line 252:
  
 
[https://www.phillipsmedisize.com/ Phillips Medisize]
 
[https://www.phillipsmedisize.com/ Phillips Medisize]
 +
 +
[https://www.design-simulation.com/ Design Simulation Technologies]
  
 
[https://www.3dprinting.nl/ 3d Printing]
 
[https://www.3dprinting.nl/ 3d Printing]
 +
 +
[https://crystalsbylila.com/ Crystals by Lila]
 +
 +
== Interesting Media ==
 +
 +
[https://www.npostart.nl/close-up/03-11-2021/AT_300003405/ Monobloc - How a plastic chair changed the world (partly Dutch language)]
 +
 +
[https://www.youtube.com/watch?v=XtMmeAjQTXc&list=PL8_xPU5epJddRABXqJ5h5G0dk-XGtA5cZ The Mechanical Universe]
 +
 +
[https://www.youtube.com/watch?v=v__HkemcHOE/ Spaceclaim - Sheet Metal Basics Part 1]
 +
 +
[https://www.youtube.com/watch?v=JE0zAl7OYnI/ Spaceclaim - Sheet Metal Basics Part 2]
 +
 +
[https://www.vpro.nl/programmas/tegenlicht/kijk/afleveringen/2012-2013/semler.html Ricardo Semler - The strength of happiness (partly Dutch language)]
 +
 +
[https://www.vpro.nl/programmas/tegenlicht/kijk/afleveringen/2014-2015/nieuwe-wijsheid-semler.html Ricardo Semler - The new wisdom (partly Dutch language)]
 +
 +
[https://www.youtube.com/watch?v=gp4U5aH_T6A Lex Fridman - Bitcoin, Anarchy, and Austrian Economics]
 +
 +
[https://www.youtube.com/watch?v=bBC-nXj3Ng4 How does Crypto currency actually work?]
 +
 +
[https://www.youtube.com/watch?v=PPySn3slfXI Brain Man; the boy with the incredible brain]

Latest revision as of 11:53, 27 August 2023

Company

Macsys was founded as a General Partnership (Dutch V.O.F.) on October 13, 2006. The name Macsys is inspired by CAM software Cimatron, where MACSYS stands for MAchine COordinate SYStem. Macsys Engineering B.V. and Macsys Holding B.V. are founded May 22, 2012, replacing the existing partnership structure. In 2019 Macsys Engineering BV activities have all been transferred to Macsys Holding BV.

Experience

Rel.jpg

3d Printing [years 2006-2008]

Macsys uses SketchUp software to transform architectural 2d drawings into 3d surface models. The 3d surface models are fed into Z-Corp printers to create tangible solid models or maquettes. Z-Corp printers use inkjet-technology to create full color models, making them ideal for visualization.

Traditionally, architectural models are handmade using various materials. These materials have a look and feel that is close to the finished building, something that can not be achieved with 3d printing. The benefit of 3d printing is speed. A virtual 3d model is created faster and in finer detail then hand crafted models, especially if the building design is available digitally. Because 3d printed models are build up in layers, the surface finish is inferior to traditional models. The surface finish however can be improved by sanding or bead blasting.

Macsys pilot project (non-commercial) involved CAD modelling and printing of a 1930's house located in Woerden. The printed house is glued on a wooden pedestal. This model was used as proof-of-concept and a demonstration project for potential customers.

The first commercial project for Macsys was creating a colored 1:50 scale model of a villa in Dronten. Details include; tiled roof, water drainage pipes and muntin windows. At the time of modeling this project, there was no 'shell function' available in SketchUp, meaning that creating the correct wall thicknesses had to be done manually. A very tedious and time-consuming task, which is fully automated in most solid modelers. The second project was a huge jump in complexity. It was requested to build a scale model of a 900 m² mansion. It was requested to build the model with an open roof, making it possible to view the internal layout. Since the scaled model was larger than the available 3d printer, the model required sectioning. Building plans for the 30m x 30m mansion were available in AutoCad 2d format. The mansion includes: a swimming pool, sauna, fitness room and underground parking. Macsys's third model was a challenge in terms of detailing. The unique house design includes an elevation, round structure, high detail stairs, pillars and balcony. Since printed models are relatively weak, scaling was done non-uniform, so that the finer details are printed somewhat bigger and are thus stronger.

After the first projects were successfully launched, demand for models increased. That is why Macsys partnered with a SketchUp modeling firm based in Thailand. This allowed Macsys to increase its design capacity and take on more work and more challenging projects.

Gallery

  • Valkbouwmanlaan.jpg
  • Dronten3-2.jpg
  • Mension3d-exploded.jpg
  • 2d side.png
  • Printedmodel.jpg
  • Hogerijndijk.jpg
  • Iso2.jpg
  • AllParts-Final.jpg
  • SAM.jpg
  • Macsys-Soest.jpg
  • 070403-Denekamp-W30.jpg
  • 2dscan-achtergevel.jpg
  • Iso backandfloorplan.jpg
  • Isoback-buildup.jpg
  • Final detail.jpg

Engineering Service [years 2008 - Current]

Gallery

  • Dutch Boxer Commando Post.jpg
  • Horse2.jpg
  • QuickreleaseV2.gif

Product Development [years 2008 - Current]

Dip-Clip

The Dip-Clip® logo is a registered trade mark at the The Benelux Office for Intellectual Property.

  • Dip-clipk small.png
  • Prototype.JPG

BandRec App

BandRec Lite

BandRec Pro

BandRec Website

  • Bandrec.PNG


Engineering Calculations - Manual

Manual Engineering Calculation

Mechanics of Materials

Equilibrium of a Deformable body

Statics

Dynamics

Rectilinear Kinematics, Continues Motion

Rectilinear Kinematics, Erratic Motion

Curvilinear motion: Normal and Tangential components







Engineering Calculations - Mathcad

Rectilinear Kinematics, Continues motion

Mathcad is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations and was developed by Mathsoft. Mathcad has WYSIWYG functionality, which is a big advantage over the 'hidden' and 'text based' formulas used in Microsoft Exel. Macsys uses Mathcad Client 2001 for making and reporting engineering calculations. A practical starters guide for learning Mathcad can be found here.












SimWise4D

Simwise 4D integrates motion with FEA

SimWise 4D was born when DST acquired a license from MSC Software Corporation to the MSC.visualNastran 4D (vn4D) product. The software traces its roots to the Working Model 3D product developed by Knowledge Revolution, which was acquired by MSC in 1999, extended to include FEA capabilities, and renamed Working Model 4D. It has found tens of thousands of users among engineering professionals, students, and educators. In December 2020 Macsys Holding BV acquired a perpetual licence from DST for the use of SimWise 4D software.


SimWise4D demo files

Various FEA bonding options in Simwise 4D ➡ download


More on SimWise 4D...












Simulations & Animations

Gallery

  • Genevawheel animation.gif
  • Intermittingmotion.gif
  • Rotationalcam.gif
  • Scotchyoke.gif
  • Variable-quick-drop.gif
  • Ratched.gif
  • Platecam21.gif
  • Platecam-B.gif


More on Simulations & Animations...











CAD, Kinematic simulations and FEM video's by Macsys

CAD Speedrun challenge

Relations

Almost Famous Band

Etergo - Smart Electric Scooter

Yuiop - App Development

AESC - Software

Electric Dutchman Scooter

MCi - Mirror Controls International

McFly and Brown - Tech Recruitment

Yxion - Pharmaceutical Consultancy

YACHT - Tech Recruitment

MMID-group - Product Development

Rheinmetall Defence

Phillips Medisize

Design Simulation Technologies

3d Printing

Crystals by Lila

Interesting Media

Monobloc - How a plastic chair changed the world (partly Dutch language)

The Mechanical Universe

Spaceclaim - Sheet Metal Basics Part 1

Spaceclaim - Sheet Metal Basics Part 2

Ricardo Semler - The strength of happiness (partly Dutch language)

Ricardo Semler - The new wisdom (partly Dutch language)

Lex Fridman - Bitcoin, Anarchy, and Austrian Economics

How does Crypto currency actually work?

Brain Man; the boy with the incredible brain

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