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Legal notice

Version in force as of 4 septembre 2026.

Translation for information only. This is a courtesy translation of the French document « Mentions légales », which is the only binding version. The seller is a French sole trader and the contract is governed by French law. In the event of any discrepancy or difference of interpretation between the two versions, the French version prevails.

In accordance with article 6-III of French Act no. 2004-575 of 21 June 2004 on confidence in the digital economy (LCEN), the following information is made available to users of this site.

Site publisher

Item	Value
Name (as held by the register)	MUCHA JACEK
Other published forms	JACEK MUCHA
Legal form	Sole trader (entrepreneur individuel, EI)
SIREN	109 189 845
SIRET of the registered office	109 189 845 00018
APE / NAF code	85.59A — Formation continue d’adultes
Registration	French national business register (RNE), active since 22 juillet 2026
Registered office	12 rue des Lilas, 60126 Longueil-Sainte-Marie, France
Telephone	+33 7 73 10 11 73
E-mail	contact@jacekmucha.fr
VAT	Not applicable — small-business VAT exemption, art. 293 B of the French tax code
Publication director	MUCHA JACEK

Activity carried on

The main activity is registered under APE code 85.59A — Formation continue d’adultes. The services offered and invoiced on this site fall exclusively within that activity: applied language courses for working life (English and Polish) and technical-literacy workshops for adults, covering the vocabulary, the documentation and the computing concepts of the distributed-ledger field, sold and paid for directly by the learner or their employer, with no public funding, to the exclusion of any investment, legal or tax advice and of any digital asset service

No other activity is carried on or invoiced through this site. The list of activities that are expressly excluded is set out on the Code of practice page.

Hosting

The site is hosted by Hostinger International Ltd., 61 Lordou Vironos Street, 6023 Larnaca, Chypre — +370 645 03378.

Intellectual property

All content on this site (text, structure, layout, teaching materials and documents given to clients) is protected by the French intellectual property code. Any reproduction or representation, in whole or in part, without prior written permission is prohibited.

Personal data

The processing of personal data is described in the privacy policy. Any request concerning data may be sent to contact@jacekmucha.fr or by post to the registered office given above.

Consumer mediation

Under article L. 612-1 of the French consumer code, every consumer has the right to use a consumer mediator free of charge. As at today's date, no membership of a mediation scheme has been taken out; the process is under way and the mediator's details will be published on this page as soon as membership takes effect. In the meantime, any complaint is handled directly under the procedure described in the “Complaints” article of the terms and conditions of sale.

Governing law

This site and the information on it are governed by French law.

Third-party trade marks

Trade marks cited. Trezor is a registered trade mark of SatoshiLabs s.r.o.; Ledger of Ledger SAS; BitBox of Shift Crypto AG; Coldcard of Coinkite Inc. These marks are cited solely to identify the devices studied in the workshop, as teaching examples. No affiliation, no partnership, no sponsorship, no resale and no official support: this site has no connection with these companies and is not the support channel of any of them. For any question about a device, contact its maker directly.

This document is governed by French law. For any question: contact@jacekmucha.fr.