Backed by $4M seed round

The Verifiable
Layer For AI

Audit every prompt. Seal every response. Cryptographic proof of every model interaction across your stack — without changing how you build.

Try free for 14 days

Get a demo

Features

Cryptographic integrity at scale

Cryptographic
integrity at scale

Audit every prompt. Seal every response. Cryptographic proof of every model interaction across your stack — without changing how you build.

Traceability

Padlock made of green dots, with a single glowing scan line sweeping across it vertically.

Every call, signed

Attach a verification hash to each prompt + response pair. inspect them later with full provenance, model, version, params, latency.

Traceability

Every call, signed

Attach a verification hash to each prompt + response pair. inspect them later with full provenance, model, version, params, latency.

Traceability

Every call, signed

Attach a verification hash to each prompt + response pair. inspect them later with full provenance, model, version, params, latency.

Privacy

Prove without revealing

Zero-knowledge proofs let you confirm a model behaved correctly without exposing prompts, responses or user data.

Privacy

Prove without revealing

Zero-knowledge proofs let you confirm a model behaved correctly without exposing prompts, responses or user data.

Privacy

Prove without revealing

Zero-knowledge proofs let you confirm a model behaved correctly without exposing prompts, responses or user data.

Immutability

Written to the ledger

Every seal is anchored to a content-addressed merkle log. tamper-evident. replayable. nothing rewrites itself.

Immutability

Written to the ledger

Every seal is anchored to a content-addressed merkle log. tamper-evident. replayable. nothing rewrites itself.

Observe

Real-time visibility

Watch every prompt sealed and every response anchored — live, across all edge regions.

Audit.log

Live

A dark mode terminal interface displaying a running log of system events.

global

Edges

A minimalist dark-themed network visualization showing a green arc connecting three geographic locations labeled with airport codes

Protocol primitives

Two lines of code

Wrap your llm calls with the sentinel sdk. that's it. every prompt and response is sealed, hashed, and audit-ready — across openai, anthropic, grok, and every model in your stack.

before

A code snippet in a dark-themed text editor written in JavaScript/TypeScript.

after

A code snippet in a dark-themed text editor red lines from 1 to 11, modified with numbe

// drop in

No rewrites

Works with the openai, anthropic, and grok sdks you already use. no change to your call sites.

// drop in

No rewrites

Works with the openai, anthropic, and grok sdks you already use. no change to your call sites.

// zero overhead

< 8ms p99

Sealing happens async at the edge. your latency budget is untouched.

// zero overhead

< 8ms p99

Sealing happens async at the edge. your latency budget is untouched.

// universal

22 Sdks. one protocol

Typescript, python, go, rust, ruby. server, edge, browser. a single hash format everywhere.

// universal

22 Sdks. one protocol

Typescript, python, go, rust, ruby. server, edge, browser. a single hash format everywhere.

Pricing

Seal at any scale.

Every tier includes the full protocol. You only pay more when you ship more.

Monthly

Annual

Save 20%

Witnesser

Individual devs, side projects, early-stage.

$49

$39

/month

Seal up to 1M calls/month

Deploy in 60 seconds — two lines, zero config

7-day audit log retention — inspect, replay, export

Community sdk support

Real-time dashboard — watch every hash land live

Get started

cancel anytime

Prover

$79

$63

/month

Seal up to 1M calls/month

Deploy in 60 seconds — two lines, zero config

7-day audit log retention — inspect, replay, export

Community sdk support

Real-time dashboard — watch every hash land live

TRY FREE FOR 14 DAYS

cancel anytime

Arbiter

For organizations, regulated industries

$99

$79

/month

Seal up to 1M calls/month

Deploy in 60 seconds — two lines, zero config

7-day audit log retention — inspect, replay, export

Community sdk support

Real-time dashboard — watch every hash land live

Get started

cancel anytime

Monthly

Annual

Save 20%

Witnesser

Individual devs, side projects, early-stage.

$49

$39

/month

Seal up to 1M calls/month

Deploy in 60 seconds — two lines, zero config

7-day audit log retention — inspect, replay, export

Community sdk support

Real-time dashboard — watch every hash land live

Get started

cancel anytime

Prover

$79

$63

/month

Seal up to 1M calls/month

Deploy in 60 seconds — two lines, zero config

7-day audit log retention — inspect, replay, export

Community sdk support

Real-time dashboard — watch every hash land live

TRY FREE FOR 14 DAYS

cancel anytime

Arbiter

For organizations, regulated industries

$99

$79

/month

Seal up to 1M calls/month

Deploy in 60 seconds — two lines, zero config

7-day audit log retention — inspect, replay, export

Community sdk support

Real-time dashboard — watch every hash land live

Get started

cancel anytime

Verified clients

Trusted by the teams building ai that can't afford to be wrong

From compliance-heavy enterprises to latency-obsessed startups — the teams that ship the most critical ai use sentinel to prove it worked.

We audited 400 million model calls last quarter across seven different model providers. sentinel was the only infrastructure that didn't flinch — latency held, the ledger stayed consistent, and not a single seal was lost. it's the kind of reliability you stop noticing because it never fails.

Daniel Wu

Cohereai

Daniel Wu

Cohereai

We ran sentinel across six production models for ninety days. every prompt sealed, every response anchored. when a model started drifting in week seven, the ledger caught it four hours before our own monitoring did.

Tomas Leiva

DrexyAI

Tomas Leiva

DrexyAI

We'd been building our own audit layer for eight months. then sentinel shipped. two lines of sdk, same guarantees, infinitely better coverage. we deleted twelve thousand lines of internal tooling and never looked back.

Priya Anand

Voxa

Priya Anand

Voxa

Faq

Everything you need to know, answered.

Latency, data exposure, compliance, cost. self-hosting. We answer the hard ones here without the marketing language. If something is missing, the spec is public.

Does sentinel add latency to my llm calls?

Does sentinel see my prompts or responses?

What happens if sentinel goes down?

Is this compliant with hipaa, soc 2, and gdpr?

How is this different from just logging my llm calls?

What does a seal actually contain?

The proof layer your
stack is missing

Sentinel seals every prompt, every response, every inference. Ship AI with the same confidence you ship code.

Try free for 14 days

The Verifiable Layer For AI

Cryptographic integrity at scale

Cryptographic integrity at scale

Real-time visibility

Two lines of code

Seal at any scale.

$49

$39

$79

$63

$99

$79

$49

$39

$79

$63

$99

$79

Trusted by the teams building ai that can't afford to be wrong

Everything you need to know, answered.

The proof layer your stack is missing

The Verifiable
Layer For AI

Cryptographic
integrity at scale

The proof layer your
stack is missing