wallet_getHeaderForHeight

THE RISK

Low Risk

Why wallet_getHeaderForHeight needs a policy

This tool retrieves a read-only block header from the blockchain at a specified height. It performs a query operation (get) with no capability to modify, delete, or execute code. The data returned is immutable historical blockchain information. Even in an adversarial scenario, misuse would only allow an agent to retrieve existing public blockchain data, presenting minimal risk.

From the tool's definition Tool name 'wallet_getHeaderForHeight' and description 'Gets the 80-byte block header at a given height' indicate a retrieval operation that queries blockchain data without modification or side effects.

Documented attack patterns abuse exactly the kind of access wallet_getHeaderForHeight gives an agent:

POLICY

How to control wallet_getHeaderForHeight

PolicyLayer is an MCP gateway — it sits between your AI agents and Bitcoin SV MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for wallet_getHeaderForHeight:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wallet_getHeaderForHeight": {}
  }
}

wallet_getHeaderForHeight is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Bitcoin SV MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about wallet_getHeaderForHeight

What does the wallet_getHeaderForHeight tool do? +

Gets the 80-byte block header at a given height. It is categorised as a Read tool in the Bitcoin SV MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on wallet_getHeaderForHeight? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_getHeaderForHeight: 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 SV MCP Server. Nothing to install.

What risk level is wallet_getHeaderForHeight? +

wallet_getHeaderForHeight is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit wallet_getHeaderForHeight? +

Yes. Add a rate_limit block to the wallet_getHeaderForHeight 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 wallet_getHeaderForHeight completely? +

Set action: deny in the PolicyLayer policy for wallet_getHeaderForHeight. 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 wallet_getHeaderForHeight? +

wallet_getHeaderForHeight is provided by the Bitcoin SV MCP Server MCP server (b-open-io/bsv-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bitcoin SV MCP Server tool call.

Start from Bitcoin SV MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →