EU sovereignE-signaturesHeadquarters: CZ

PostSignum: sovereignty score and 8 European alternatives

PostSignum is the certification authority service of Česká pošta, the Czech postal enterprise, and is offered under the Czech Post brand. It issues qualified certificates for electronic signatures, commercial certificates for authentication and encrypted e-mail, and qualified time-stamps through a TSA service. The website describes qualified certificates for communication with state administration and Czech Post's own service range, which includes the ability to order certificates online and collect them at Czech Post branches. Customers include individuals, businesses, self-employed persons and public administration.

Česká pošta, s.p. is a state enterprise with its seat in Prague, founded by the Czech Ministry of the Interior, so no foreign owner applies. Its GDPR information page covers the processing of personal data. The website does not state where certificate or time-stamp data is hosted. For a European organisation, PostSignum is a state-owned provider inside the EU. Its qualified certificates are issued under EU trust-service rules, so the trust relationship stays with a Czech operator under Czech and EU law.

See the 8 European alternatives ↓Assess your stack with PostSignum pre-selected

Mastodon LinkedIn Bluesky X Email

Sovereignty score

71 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-2100
Headquartered in the EU: European law applies
Data residency SOV-3100
EU-only hosting
Cryptographic key sovereignty SOV-360
Key management with a European vendor
Freedom from lock-in SOV-640
Closed source: switching requires data migration
Source & runtime sovereignty SOV-4 · SOV-655
Closed source, runtime with the vendor

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 12, 2026

Headquarters	CZ (EU)Verified by hand
Sovereignty model	Vendor-hosted (EU)Verified by hand
Data hosting	EUVerified by hand
Open-source	NoVerified by hand
GDPR-compliant	YesVendor-stated
Category	E-signatures
Type	Product
Website	postsignum.cz ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to PostSignum

The European alternatives to PostSignum come from our knowledge base of over 8,000 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

63 European E-signatures vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

Is PostSignum one of many dependencies?

Score your whole stack in about three minutes. Free, no account needed.

Assess your stack →View a sample report (opens in a new tab)

Why digital sovereignty matters with PostSignum

PostSignum is headquartered in CZ and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Data is hosted exclusively in the EU, so PostSignum scores best on data residency.

PostSignum is closed source and hosted by the vendor. The encryption keys and the runtime sit with the vendor and switching requires data migration. Ask about bring-your-own-key, export options and open standards.

What this means for your organisation depends on your whole stack and context. The free assessment weighs PostSignum together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to PostSignum?

It depends on your use case. Strong EU alternatives to PostSignum include A-Trust, Agrello and ANF AC. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to PostSignum?

Our list of EU alternatives to PostSignum is mostly commercial options. Browse the category on the map for open-source choices.

Is PostSignum GDPR-compliant and where is the data hosted?

PostSignum is headquartered in CZ (EU) and hosts data in EU. That makes PostSignum an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 12, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in E-signatures

E-signatures: Electronic signatures, trust services, eIDAS services. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

Also in this category

See all →

Open in the alternatives dashboard Missing a vendor? Submit it Are you this vendor? You can also become a sponsor on the E-signatures page — with no effect on your score