Who is affected
Any organisation using AI for decisions requiring an audit trail — particularly finance, healthcare, public sector and entities under the EU AI Act or TSP requirements.
Compliance evidence · TSP-verified certificates
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TSP and verifiable trust
TSP (Trust Standard Protocol) is an open protocol for verifiable AI evidence. LexiCo AS operates TSP as operator and licensee — not as owner of the standard. The certifications cover how TSP-signed evidence documents that AI output is traceable, verifiable and audit-ready.
Information technology
Banking and finance
Insurance
Healthcare
Public sector
Legal services
Consulting
Key requirements
- TSP signing of AI output and decision trails
- Verifiable chain from prompt to result
- Integration with existing compliance frameworks
- Evidence retention per archival and bookkeeping rules
- Third-party verification at audit
Available certifications
Certification track
TSP
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Open certification: TSP Basic — Verifiable AI evidenceBasic
TSP Basic — Verifiable AI evidence
Why ordinary logs are not proof, how the Trust Standard Protocol makes AI evidence durable and verifiable — and what TSP explicitly does not promise.
Free Start →40 min / participant / yr -
Open certification: TSP Pro — ImplementationPro
TSP Pro — Implementation
TrustEnvelope v3 in detail, the TrustManifest and key management, the toolchain from issuer init to verify — and the four checks that decide everything.
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Open certification: TSP Expert — Audit and verificationExpert
TSP Expert — Audit and verification
For auditors, DPOs, CISOs and supervisors: independent offline verification, the Seal layer's anchoring/qualified time/register, threat model and leaderboard.
What TSP means — and does not mean
The Trust Standard Protocol (TSP) is an open protocol that makes AI decision evidence durable, tamper-evident and verifiable offline — by anyone, without having to trust the vendor. Every event is signed with Ed25519, hashed with SHA-256 over canonical JSON (JCS, RFC 8785) and chained to the previous entry.
TSP verifies the integrity of the evidence — not whether the content is true, lawful or compliant. TSP does not make you compliant, does not prove that a model is correct or safe, and grants no official status. Payment never grants official status. The legal assessment remains with your DPO and legal advisers.
TSP is currently operated by LexiCo AS (Norway, EU/EEA) as operator and licensee — not as owner of the standard and not as a certification authority. The open layer (specification, test suites, verifiers, TrustBadge) is Apache-2.0 licensed.