Forensic-grade · KYC · Fraud · Compliance · Legal

Prove Every
Important Decision.

Cryptographic witness for AI decisions. Immutable. Verifiable. Defensible. Forensic-grade evidence from the moment of generation.

The black box for AI decisions. Every output sealed at generation — not after.

Prove Your Decisions → See Live Demo
Live Decision Proof
⚖️
KYC Decision REJECT
subject: user_8821 · risk_score: 0.91
🔒
Sealed & Signed
ed25519 · SHA-256 · ISCProof v5.1
⏱️
TSA Timestamped
RFC 3161 · freetsa.org · 19 Apr 2026
✉️
Notification Delivered
compliance@company.com · verify link embedded
✅ VERIFIED — All checks passed
Open proof →
3
Lines of code to integrate
RFC 3161
Trusted timestamp standard
Aug 2026
EU AI Act high-risk deadline
The Problem

Your AI makes decisions.
Can you prove them?

When a regulator asks why your AI rejected a user, what do you show? A log file? A database record? These can be changed. BuildSeal creates immutable cryptographic evidence.

⚠️
Log files can be alteredStandard logs have no integrity guarantee. Anyone with DB access can change them.
⚠️
No third-party verification"Trust us" is not compliance. Regulators need independent, verifiable proof.
⚠️
EU AI Act Article 12High-risk AI systems must have automatic logging. Non-compliance: up to 3% global revenue.
Audit Trail Comparison
Standard logMutable ✗
Database recordMutable ✗
Email archiveMutable ✗
BuildSealImmutable ✓
RFC 3161 TimestampVerified ✓
ed25519 SignatureCryptographic ✓
Independent verifyPublic URL ✓
How It Works

Three steps to
audit-grade proof

01 — EVALUATE
Your AI makes a decision
KYC rejection, credit denial, fraud flag — any high-stakes AI decision that needs an audit trail.
decision = agent.run(user_data)
02 — SEAL
BuildSeal creates cryptographic proof
Decision payload is canonicalized, hashed, signed with ed25519, and timestamped via RFC 3161 TSA.
result = seal_decision(**decision)
03 — VERIFY
Anyone can verify independently
Share a verify link. Regulators, auditors, courts — anyone can check authenticity without trusting you.
verify.buildseal.io/release/:id
Compliance

Built for the
regulatory moment

The EU AI Act is not optional. High-risk AI systems face mandatory audit trail requirements from August 2026. BuildSeal makes compliance a 3-line integration.

EU AI ACT · ART. 12

Automatic Logging

Article 12 mandates automatic recording of events for high-risk AI systems. BuildSeal fulfills this with cryptographic guarantees — not just database records.

EXPLAINABILITY

Decision Transparency

Every seal captures reason_code, risk_score, input_refs, and rules_triggered. When asked why your AI decided — you have a verifiable, complete answer.

TAMPER-PROOF

Immutable Records

ed25519 cryptographic signatures + RFC 3161 timestamps make records impossible to alter. Even BuildSeal cannot modify a sealed decision.

INDEPENDENT VERIFY

Third-Party Verifiable

Every decision gets a public verify URL. Regulators can cryptographically verify the record independently, offline if needed.

Live Demo

A real sealed decision

seal_1776629149998_k3whsb · KYC Decision · APPROVE✓ VERIFIED
Decision Payload
decision
APPROVE
reason_code
DOCS_VERIFIED
subject_type
customer
risk_score
0.12
model
kyc-agent-v1
Cryptographic Proof
timestamp
✓ RFC 3161 · freetsa.org
signature
✓ ed25519 verified
root_hash
4feb823f…9bf4f48e
pack_version
ISCProof v5.1
Pricing

Simple, usage-based pricing

STARTER
Free
$0
100 seals / month
  • 100 sealed decisions/mo
  • Public verify URLs
  • RFC 3161 timestamps
  • Decision payload storage
Get started
GROWTH
Pro
$29/mo
Unlimited seals
  • Unlimited sealed decisions
  • Evidence + communication proof
  • Event chain audit trail
  • Portable verification packages
  • API access
Start free trial
ENTERPRISE
Custom
$499/mo
From · custom pricing
  • Everything in Pro
  • SLA guarantee
  • Custom domain
  • Witness / second signer
  • Dedicated support
Contact us
Get Started

Your AI is making decisions.
Start proving them.

EU AI Act compliance deadline: August 2026. Do not wait until regulators ask.

Prove Your First Decision Free →