wallet_verifyHmac

Verifies an HMAC using wallet keys.

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

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What wallet_verifyHmac does on Bitcoin SV MCP Server

AI agents call wallet_verifyHmac to retrieve information from Bitcoin SV MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why wallet_verifyHmac is rated Low

HMAC verification is a read-only cryptographic operation that validates message authenticity without side effects. It retrieves or processes data (the HMAC signature and wallet keys) to produce a verification result. While it involves wallet keys, the operation itself does not create, modify, delete, or execute transactions.

From the tool's definition Tool name 'wallet_verifyHmac' and description 'Verifies an HMAC using wallet keys' indicate a cryptographic verification operation that checks the authenticity of a message using existing wallet keys as input.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs wallet_verifyHmac 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_verifyHmac, this is the rule to start with:

wallet_verifyHmac Allowed

wallet_verifyHmac is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY 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_verifyHmac call is checked against it from then on.

FAQ

Questions about wallet_verifyHmac

What does the wallet_verifyHmac tool do? +

Verifies an HMAC using wallet keys. 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_verifyHmac? +

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

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

Can I rate-limit wallet_verifyHmac? +

Yes. Add a rate_limit block to the wallet_verifyHmac 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_verifyHmac completely? +

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

wallet_verifyHmac 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.

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