GNU Taler

Electronic payment system

GNU Taler

Developer(s)	Christian Grothoff and Florian Dold
Repository	git.taler.net
Type	Microtransaction and electronic payment
License	Clients: GPL-3.0-or-later^[1]^[2] Servers: AGPL-3.0-or-later Libraries: LGPL-2.1-or-later
Website	taler.net

GNU Taler is a free software-based microtransaction and electronic payment system.^[3]^[4] Unlike most other decentralized payment systems, GNU Taler does not use a blockchain.^[5] A blind signature is used to protect the privacy of users as it prevents the exchange from knowing which coin it signed for which customer.^[5]

The project is led by Florian Dold and Christian Grothoff^[6] of Taler Systems SA. Taler is short for the "Taxable Anonymous Libre Economic Reserves"^[7]^[8] and alludes to the Taler coins in Germany during the Early Modern period. It has vocal support from GNU Project founder Richard Stallman.^[9] Stallman has described the program as "designed to be anonymous for the payer, but payees are always identified."^[10] In a paper published in Security, Privacy, and Applied Cryptography Engineering, GNU Taler is described as meeting ethical considerations – the paying customer is anonymous while the merchant is identified and taxable.^[11]^[12] An implementation is provided by Taler Systems SA.^[13]^[14]

Project history

In november, 2014 taler.net was launched by INRIA decentralising team as a new electronic payment system, and Christian Grothoff introduced it a month later in a fOSSa conference talk at INRIA^[15].

Taler have become an official GNU package in february, 2015, and its first release (versioned 0.0.0) was on 1st June, 2016.^[15]

In 2016 Taler Systems S.A. was created (headquartered in Luxembourg), to provide business support and management for the Taler users. The same year they have published Web Payments paper and finished Chrome and Firefox plugins available for testing.^[15]

In 2020 the project received a grant from NLnet and the European Commission's Horizon 2020 Next Generation Internet (NGI) initiative to perform an external security audit of the system, which was done by CodeBlau in July. In September a live system was launched at Bern University of Applied Sciences, originally for a Taler-enabled snack machine. In October payto: internet URI scheme, allowing a standardised way to provide payments for internet end-users.^[15]

Their cooperation with the Swiss National Bank have resulted multiple papers on the relation of conventional national banks and electronic money, the privacy implications and various financial viability factors.^[15] There was also various papers about real-life problems and their handling by Taler, like anonymous age verification, relations to Central Banks and the Euro or using One-Time Passcodes.

In January 2024 the NGI launched an Europa-scope Taler project as a privacy-preserving payment system. In 2024 multiple auditor companies announced that they provide services for Taler payment providers.^[15]

References

^ "Taler licensing information".
^ "Taler - Free Software Directory".
^ "GNU Taler 0.0.0 Released: GNU Tries To Get Into Electronic Payments".
^ "GNU cryptocurrency aims at 'the mainstream economy not the black market'". The Register.
^ ^a ^b "FAQ: How is Taler related to Bitcoin or Blockchains?".
^ "GNU Taler: Ethical Online Payments for the Internet Age". ercim-news.ercim.eu. Retrieved 2020-04-23.
^ Sprint, Book (2016-05-19). Cost of Freedom. Lulu.com. ISBN 978-1-365-08698-4.
^ "Halbanonymes Bezahlsystem: GNU Taler soll Kryptowährungen gerechter machen - Golem.de". www.golem.de (in German). Retrieved 2020-01-03.
^ "Stallman's final interview as FSF president: Last week we quizzed him over Microsoft visit. Now he quits top roles amid rape remarks outcry". The Register.
^ "A radical proposal to keep your personal data safe". TheGuardian.com. 3 April 2018.
^ Carlet, Claude; Hasan, M. Anwar; Saraswat, Vishal (2016-12-09). Security, Privacy, and Applied Cryptography Engineering: 6th International Conference, SPACE 2016, Hyderabad, India, December 14-18, 2016, Proceedings. Springer. ISBN 978-3-319-49445-6.
^ Dold, Florian (2019-02-25). The GNU Taler system : practical and provably secure electronic payments (phdthesis thesis). Université Rennes 1.
^ Pentland, Alex 'Sandy'. "Digital cash and privacy: What are the alternatives to Libra?". MIT Media Lab. Retrieved 2019-12-28.
^ "Kampf der Kryptowährungen – das sind die Alternativen zu Libra". www.netzwoche.ch (in German). 30 November 2019. Retrieved 2020-01-03.
^ ^a ^b ^c ^d ^e ^f "Taler News". GNU Taler.