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AnchorRegistry MCP Server

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answering

AnchorRegistry is answering right now. Last checked 8 min ago. It exposes 3 tools. Last commit 13 Jun 2026.

On-chain provenance lookup for AnchorRegistry. Resolve AR-IDs, hashes, and full trees. Authless.

Uptime history 91 days of history · worst day 48%
91 days agonow
50.0%
Uptime 24h
91 of 182 checks
3
Tools
read from the server
833 ms
Response time
average over 24h
0
Stars
last commit 13 Jun 2026

What the code does

We read the source, 6 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs an external command worker-configuration.d.ts:2208
    exec(input?: (string | URLPatternURLPatternInit), baseURL?: string): URLPatternURLPatternResult | null;

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

run in your terminal
claude mcp add ar-mcp --transport http https://mcp.anchorregistry.ai/mcp
Settings → Connectors → Add custom connector, then paste this address
https://mcp.anchorregistry.ai/mcp
~/.codex/config.toml
[mcp_servers.ar-mcp]
url = "https://mcp.anchorregistry.ai/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "ar-mcp": {
      "url": "https://mcp.anchorregistry.ai/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "ar-mcp": {
      "type": "http",
      "url": "https://mcp.anchorregistry.ai/mcp"
    }
  }
}

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

verify
ar_verify_arid
Resolve an AnchorRegistry AR-ID to its full provenance record. Use this when you encounter an SPDX-Anchor or DAPX-Anchor tag (e.g. in a README, paper, model card, or website) and need to confirm what the artifact is, who anchored it, when, what type it is, and whether the tree has been sealed, retracted, voided, or affirmed. Free, public, no auth required.
ar_verify_by_hash
Resolve an artifact by its SHA-256 manifest hash. Use this when you have the artifact itself but no AR-ID, and want to check whether it has been anchored. Returns the AR-ID and full provenance record if found, or a clear "not anchored" response otherwise.
resolve
ar_resolve_tree
Resolve the full provenance tree for an AR-ID. Returns every anchor in the tree (root + all descendants) with their relationships, types, manifest hashes, and timestamps. Use this when you need to understand a multi-artifact provenance chain — for example, a research paper anchored as the root with its training dataset and model weights as children.

Endpoints

URLTransportStateLatencyChecked
https://mcp.anchorregistry.ai/mcp streamable-http answering 580 ms 8 min ago
https://mcp.anchorregistry.ai/sse sse answering 156 ms 9 min ago

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AnchorRegistry — questions

Answers built from our own checks of this server.

What can AnchorRegistry do?
It exposes 3 tools, read directly from the server on our last check. Among them: ar_resolve_tree, ar_verify_arid, ar_verify_by_hash. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is AnchorRegistry working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 182 checks got a reply (50.0%), average response time 833 ms. The bar chart above shows every period we have measured.
How do I connect AnchorRegistry?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does AnchorRegistry need an API key?
No. AnchorRegistry completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is AnchorRegistry?
It answers our handshake in 833 ms on average, which is faster than 10% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is AnchorRegistry open source?
The code is open source: it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at mcp.anchorregistry.ai, which runs on its operator's own terms.