mcp

Privacy-preserving file proofs on Solana.

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What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    Privacy-preserving file proofs on Solana. Files are hashed locally. Currently free, no API key.

    How to connect

    How to connect mcp to Claude

    The server address to paste into Claude settings:

    https://api.verifyum.com/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect mcp to ChatGPT

    The server address to paste into ChatGPT settings:

    https://api.verifyum.com/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect mcp to Cursor

    The server address to paste into Cursor settings:

    https://api.verifyum.com/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (3)

    Raw names from tools/list. Only developers need these.

    verifyum_get_proofRead the lifecycle state of one Verifyum proof (queued, submitted, finalized or failed). Input is a public proof ID only.
    verifyum_verify_public_proofCheck a finalized proof: metadata consistency, the exact 128-byte memo, and the Ed25519 service signature against the published key registry. The response also contains the exact Solana RPC call and expectations so the caller can independently confirm the transaction on chain, because this hosted check is performed by the Verifyum service itself. A finalized Verifyum anchor demonstrates that a commitment to exact file bytes existed no later than the estimated Solana block time. It does not prove authorship, ownership, legal signature validity, when the file was first created, or whether statements inside the file are true.
    verifyum_anchor_commitmentSubmit one locally calculated Verifyum version 2 commitment. Accepts only the commitment and an idempotency key. Never send a file, filename, raw file hash, nonce or private manifest. The caller must hash the file and build the private manifest on its own machine first, as documented at https://verifyum.com/agents. This creates a real public transaction on Solana Mainnet. Public use is currently free and the network fee is currently paid by AI SENSE AS. That is a current service policy, not a permanent pricing guarantee. Create proofs only on clear user intent, never speculatively, in bulk, or as a hidden side effect. When retrying, reuse the exact same commitment and idempotency key.