Koskamo

Proof Holdings MCP

An official MCP server from Proof Holdings that provides 167 tools for AI agents to perform cryptographic verifications, including Proof of Control (verifying ownership of phone, email, or domain), Proof of Delegation (authorizing specific packages or servers), Proof of Action (obtaining signed human approval for irreversible steps), and Proof of Me (confirming identity to prevent impersonation).

Visit Proof Holdings

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Proof Holdings MCP logo, by Proof HoldingsVendor evidenceLocal stdioSource reviewed; not executedOperated by Proof Holdings
You need:API key via `x-api-key` header
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Official MCP Registry namespace is tied to proof.holdings ·

What you can do with it

  • Verify that a user controls a specific phone number, email address, or domain
  • Authorize and revoke specific MCP servers or packages under a company's name
  • Obtain signed human approval before executing irreversible actions like payments or deployments
  • Confirm identity to prevent impersonation attacks on colleagues or family members

Source and maintenance

Vendor evidenceRegistry 1.7.1MIT
mcp-registry: holdings.proof/mcp-server@1.7.1Source repositoryProject website
Last repository push
Latest release
v1.7.0
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@proof-holdings/mcp-server 1.7.1

npm
@proof-holdings/mcp-server package definition
{
  "version": "1.7.1",
  "transport": "stdio",
  "identifier": "@proof-holdings/mcp-server",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "PROOF_API_KEY",
      "description": "Proof Holdings API key (Bearer). Optional: without it the server runs in public mode, where account creation, login and public verification tools work and every other tool asks for a key. Create one in the dashboard at https://proof.holdings. Or run `npx @proof-holdings/mcp-server login` in a terminal: it signs in, confirms on a second channel and saves a key in ~/.proof-holdings/credentials, which the server uses when this variable is unset (this variable wins when set). Either is read at startup and has no runtime setter, so restart the server after logging in."
    },
    {
      "name": "PROOF_BASE_URL",
      "description": "API base URL. Defaults to https://api.proof.holdings."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "proof-holdings-mcp-proof-holdings-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@proof-holdings/mcp-server@1.7.1"
      ],
      "env": {
        "PROOF_API_KEY": "<YOUR_PROOF_API_KEY>",
        "PROOF_BASE_URL": "<YOUR_PROOF_BASE_URL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "proof-holdings-mcp-proof-holdings-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@proof-holdings/mcp-server@1.7.1"
      ],
      "env": {
        "PROOF_API_KEY": "<YOUR_PROOF_API_KEY>",
        "PROOF_BASE_URL": "<YOUR_PROOF_BASE_URL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "proof-holdings-mcp-proof-holdings-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@proof-holdings/mcp-server@1.7.1"
      ],
      "env": {
        "PROOF_API_KEY": "<YOUR_PROOF_API_KEY>",
        "PROOF_BASE_URL": "<YOUR_PROOF_BASE_URL>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "proof-holdings-mcp-proof-holdings-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@proof-holdings/mcp-server@1.7.1"
      ],
      "env": {
        "PROOF_API_KEY": "<YOUR_PROOF_API_KEY>",
        "PROOF_BASE_URL": "<YOUR_PROOF_BASE_URL>"
      }
    }
  }
}

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