Public blockchains, like Ethereum and Bitcoin, can only perform ten transactions per second. If you only want to put one percent of global financial markets on the blockchain, you would have to do hundreds of thousands more. That is where Perun comes in. They are a B2B startup and work with other companies who are interested in blockchain or already working with it. Perun generates an additional layer on the original blockchain, their protocol (2nd layer off-blockchain) is more secure and much faster by enabling transactions to be sent peer to peer in separate channels without confirmation of thousands of blockchain miners. In each channel, thousands of transactions per second are possible with current technology.

Perun’s channel technology could also be used by centralized financial networks like credit card companies or other payment providers (think PayPal). Their channel technology also allows machine-to-machine-payments on blockchains.

During the interview, we also talk about their technology’s theoretical limit.

They will soon release their protocol as an open-source developer kit. Find more information on that on their website.

Interview Partner

In this interview, Joe is talking to Sebastian Stammler – Implementation Lead ( and Hendrik Amler Scrum Master ( at Darmstadt based Blockchain startup PERUN ( At the time of the interview (October 2019), the company was not yet incorporated.

Perun is part of a research group jointly of TU Darmstadt ( and University of Warsaw ( TU Darmstadt is one of the great starting points for many deep-tech startups ( here in Germany. You might also want to pay a visit to HIGHEST, the startup and innovation center of the university:

Tune in to learn more.

Blockchain Germany by

If you are interested in German Blockchain startups, you can find our audio-only podcast “Blockchain Germany by” here:


As opposed to the usual Youtuber or Podcaster in the Blockchain space my guests don’t pay thousands of Euros to be here. AND neither am I invested in you guys. I am also getting NO kickback.

For everyone who is surprised about that, many channels work like this. Just pay attention to the people in Telegram Chats who ask for admin emails and “business proposals” they usually sent an offer with a price tag of several thousands of Euros, sometimes upwards of 50.000 Euros, just to be on their channel. Oh, and before I forget: They usually only want cash, they don’t take crypto.

Make sure you vet your main blockchain information source before you fall into those traps.

Further reading:

We are talking during the interview:

Vobis was a – now-defunct – computer hardware retailer in Germany, in the late 1990s. Some years they were showing the largest revenue for computer hardware in Germany. Learn more here in Wikipedia (article only in German):

Diploma degree:

Prof. Dr. Sebastian Faust of TU Darmstadt:

Prof. Stefan Dziembowski, PhD of University of Warsaw

Technical Papers for further reading:

– General State Channel Networks

– Virtual Payment Channel Hubs

– Multi-Party Virtual State Channels


Recommended Holiday Readings (Affiliated Links)

The Fire Starter Sessions by Danielle LaPorte
The 7 Habits of Highly Effective People – by Stephen R. Covey


The 8th Habit: From Effectiveness to Greatness by Stephen R. Covey
The $100 Startup by Chris Guillebeau
Outliers by Malcolm Gladwell
Grit – The Power of Passion and Perseverance by Angela Duckworth


Find the YouTube Interview here: