wallet_createHmac

Creates an HMAC using wallet keys.

SERVERBitcoin SV MCP Server SOURCEb-open-io/bsv-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/b-open-io-bsv-mcp/wallet-createhmac.md

WHAT IT DOES

What wallet_createHmac does on Bitcoin SV MCP Server

AI agents invoke wallet_createHmac to trigger actions in Bitcoin SV MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why wallet_createHmac is rated High

This tool performs a cryptographic operation (HMAC generation) using private wallet keys. It is an execution of a cryptographic function rather than a simple read or write — it actively uses sensitive wallet key material to produce an authentication code. While it doesn't move funds or delete data, misuse could expose or misuse wallet keys in unintended ways.

From the tool's definition Creates an HMAC using wallet keys

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs wallet_createHmac safely

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

wallet_createHmac Rate-limited

wallet_createHmac stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wallet_createHmac": {
      "limits": [
        {
          "counter": "wallet_createhmac_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about wallet_createHmac

What does the wallet_createHmac tool do? +

Creates an HMAC using wallet keys. It is categorised as a Execute tool in the Bitcoin SV MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on wallet_createHmac? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_createHmac: 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_createHmac? +

wallet_createHmac is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit wallet_createHmac? +

Yes. Add a rate_limit block to the wallet_createHmac 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_createHmac completely? +

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

wallet_createHmac 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.

KEEP EXPLORING

More on Bitcoin SV MCP Server, and thousands of servers like it.

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All 90 Bitcoin SV MCP Server tools → High-risk tools on this server →

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

Guides

Govern code and CI agents →Agent sandbox →Least privilege for MCP →