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Plug In: the public proof log for existing systems

Send the fingerprint of any state change from any system and get back a receipt proving it sits in an append-only public log.

Open Plug In →

What it is

Plug In lets systems that were never built for AI governance join the proof layer without being rebuilt. A legacy system sends the SHA-256 of a change, and sebbi.pro returns a receipt proving that fingerprint is in an append-only log.

How it works

The log is an RFC 6962 Merkle tree, the same construction as Certificate Transparency. Receipts come back straight away with the leaf index, tree size, root and inclusion path, so anyone can check them with any RFC 6962 verifier without trusting sebbi.pro. Only the fingerprint is ever sent, never the data.

Who it is for

Enterprises with existing core systems, banks, insurers and public bodies that need proof without migration.

Key facts

Law it answers

Price

Free for 7 days, then 50p per device per month. Checking any proof is always free.

Questions

Can I add audit proof to a legacy system?

Yes. https://sebbi.pro/plugin accepts a SHA-256 fingerprint of any change and returns an RFC 6962 inclusion receipt.

About sebbi.pro

sebbi.pro is the proof layer for AI, made by Monop Content in the United Kingdom. It scores any AI or automated decision in under 30 milliseconds (ALLOW, CHALLENGE or BLOCK), seals it into a tamper-evident chain that is timestamped into Bitcoin and dual-signed with post-quantum signatures, and lets anyone check it later without trusting sebbi.pro. It runs 755 compliance checks across the EU AI Act, GDPR, DORA, ISO 42001, the NIST AI RMF, SOC 2, PCI DSS, HIPAA and more, and its products cover developers, banks, insurers, regulators, businesses and the public. Free for 7 days, then 50p per device per month. Checking any proof is always free.

Related

sebbi receipts SDK (pip install sebbi / npm install sebbi)

One line of code gives every AI decision and every agent action a sealed receipt anyone can check at a public link.

sebbi.pro MCP Server (connector for Claude, ChatGPT and Cursor)

Add https://sebbi.pro/mcp to any AI assistant once and it can score, seal and prove decisions and run every compliance check, in conversation.

AI Gateway: seal at the wire

Change one setting, the base URL for OpenAI or Anthropic, and every model call is governed and sealed with an AI-Decision-Receipt header.

Integrations

CrewAI, LangChain, OpenAI Agents, the Vercel AI SDK, OpenTelemetry and MCP, each in one line.

Developers: API, SDKs and open spec

Docs, API, SDKs and the open specification for building on the proof layer.

© 2026 Monop Content · United Kingdom · sebbi.pro · All products · Full text for AI · Terms
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