ledger_sign_psbt

Sign a PSBT using the Ledger Bitcoin app. Requires Ledger

SERVERBitcoin wallet MCP server SOURCEmarkmhendrickson/mcp-server-bitcoin

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/markmhendrickson-mcp-server-bitcoin/ledger-sign-psbt.md

WHAT IT DOES

What ledger_sign_psbt does on Bitcoin wallet MCP server

AI agents use ledger_sign_psbt to commit financial operations through Bitcoin wallet MCP server, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why ledger_sign_psbt is rated Critical

Signing a PSBT (Partially Signed Bitcoin Transaction) is a direct step in authorizing and committing a Bitcoin financial transaction. Once signed, a PSBT can be broadcast to move funds irreversibly on the Bitcoin network.

From the tool's definition Sign a PSBT using the Ledger Bitcoin app

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs ledger_sign_psbt safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Bitcoin wallet MCP server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For ledger_sign_psbt, this is the rule to start with:

ledger_sign_psbt Approval-gated

Any call to ledger_sign_psbt is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ledger_sign_psbt": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Bitcoin wallet MCP server, apply this rule, and every ledger_sign_psbt call is checked against it from then on.

FAQ

Questions about ledger_sign_psbt

What does the ledger_sign_psbt tool do? +

Sign a PSBT using the Ledger Bitcoin app. Requires Ledger. It is categorised as a Financial tool in the Bitcoin wallet MCP server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on ledger_sign_psbt? +

Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for ledger_sign_psbt: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Bitcoin wallet MCP server. Nothing to install.

What risk level is ledger_sign_psbt? +

ledger_sign_psbt is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit ledger_sign_psbt? +

Yes. Add a rate_limit block to the ledger_sign_psbt rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block ledger_sign_psbt completely? +

Set action: deny in the PolicyLayer policy for ledger_sign_psbt. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides ledger_sign_psbt? +

ledger_sign_psbt is provided by the Bitcoin wallet MCP server MCP server (markmhendrickson/mcp-server-bitcoin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Bitcoin wallet MCP server, and thousands of servers like it.

This server

All 93 Bitcoin wallet MCP server tools → Critical-risk tools on this server →

Across the catalogue

All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →