InkSeal defines the standard for qualified digital proof — how documents, records, and evidence must be sealed to hold legal weight under Swiss and European law.
InkSeal is a specification for digital proof. It defines how any file — a photo, a report, an export from any tool — must be processed, timestamped, and packaged so that its existence at a specific point in time is independently verifiable and legally admissible.
The standard is tool-agnostic, industry-agnostic, and jurisdiction-aware.
Qualified RFC 3161 timestamp from an accredited authority. Not a local clock. Not a blockchain. A state-supervised, legally recognized time source.
SHA-256 hash ensures any modification — even a single byte — invalidates the proof. The original file is mathematically bound to the timestamp.
Verification requires no platform, no account, no vendor. The proof package contains everything needed to verify — with standard open-source tools.
InkSeal does not invent legal authority. It connects to the legal frameworks that already exist — and ensures proof packages meet their requirements.
Qualified timestamps from providers accredited by the Swiss Accreditation Service (SAS). Legally privileged evidence status.
Qualified timestamps from QTSPs on the EU Trusted List. Presumption of accuracy in all 27 member states.
Files never leave the user's device. Only the hash is transmitted. No data processing, no GDPR/DSG obligations for the implementer.
Any party — courts, insurers, auditors — can verify an InkSeal proof independently using open-source tools and the TSA's public key.
Add qualified digital proof to your existing application. Your users' files never touch our infrastructure. We handle the TSA routing — you get the proof package.
Free. Unlimited test seals with non-qualified timestamps. Full API access.
From CHF 0.10/seal or monthly flat rate. Qualified ZertES/eIDAS timestamps. Revenue-split option available.
Organizations with their own timestamping infrastructure can certify their processes as InkSeal-conformant. The certification mark signals to courts, insurers, and auditors that the proof meets the standard.
The InkSeal Standard Specification is published for reference and implementation. The following terms apply:
The InkSeal certification mark is a registered guarantee mark (Garantiemarke) under Swiss trademark law. Organizations wishing to display the mark must: