---
title: "SDI Protocol: A Hash-Chained Ledger for AI Reasoning You Can Verify Yourself"
source: "Hacker News 热门（Algolia · 中文化）"
source_tier: "t2"
url: "https://www.sdi-protocol.org"
permalink: "https://feed.astralor.com/items/itm_b79191ee4089289df5f57fb5"
published: "2026-08-25T15:09:35.000Z"
score: 63
channel: "ai"
tags: ["AI auditability","ILJO grammar","Reckoner Machine","SDI Protocol","Hash-chained ledger"]
---

# SDI Protocol: A Hash-Chained Ledger for AI Reasoning You Can Verify Yourself

## AI commentary

> This is an interesting direction, bringing an immutable chain-of-custody mindset into AI reasoning audit, which hits the pain point of agent behavior tracing. For people working on compliance, security, and AI infrastructure, it's worth following. The project is still very early; I recommend checking the compile gate API and the ILJO grammar directly and experimenting with it.

## At a glance

The SDI Protocol introduces a hash-chained ledger that makes AI reasoning permanent and inspectable. Instead of answers vanishing when a session ends, each reasoning act is structured under the ILJO grammar, checked at a compile gate that is independent of the generating model, attributed to the agent that produced it, and hash-linked to every prior act. The compile gate is publicly callable: POST a DER and receive PASS or COMPILE_ERROR, with no authentication required. This allows anyone to verify the provenance and integrity of AI reasoning steps. Presented as a Show HN project, it offers a practical approach to AI auditability and transparency, appealing to developers and researchers interested in verifiable AI systems.

## Key points

- Permanently records AI reasoning via a hash chain, preventing output loss after sessions
- Structures reasoning with the ILJO grammar and validates it through an independent compile gate
- The compile gate is publicly callable, allowing unauthenticated verification of DER inputs

## Full text

Most AI produces answers that disappear when the session ends. A Reckoner Machine commits reasoning to a permanent, inspectable chain. Each reasoning act is structured under the ILJO grammar, checked at a compile gate independent of the generating model, attributed to the agent that produced it, and hash-linked to every prior act. The compile gate is publicly callable. POST a DER and receive PASS or COMPILE_ERROR. No authentication required.

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Verify against the original before citing; curated by Astral Feed: https://feed.astralor.com/items/itm_b79191ee4089289df5f57fb5