trust-ring-key-image
Compute the key image for the active identity in a specific election context. Use this to pre-check whether the active identity has already signed in an election without creating a full signature. The key image is deterministic: same key + same electionId always produces the same image.
This record as markdown: /tools/dev-forgesworn-bray/trust-ring-key-image.md
What trust-ring-key-image does on Nostr Bray
AI agents call trust-ring-key-image to retrieve information from Nostr Bray without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why trust-ring-key-image is rated Low
This is a cryptographic computation that retrieves or derives information about the current state of an identity's participation in an election context. It has no side effects, does not execute arbitrary code or commands, does not modify any data, and does not involve financial transactions. The function is read-only verification/checking, making it clearly a Read category tool.
From the tool's definition Tool computes and returns a key image for pre-checking purposes without modifying any data. Description states it's used to 'pre-check whether the active identity has already signed' and 'produces the same image' deterministically—purely informational/query…
Attacks that exploit this kind of access
The rule that runs trust-ring-key-image safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Nostr Bray, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For trust-ring-key-image, this is the rule to start with:
trust-ring-key-image is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every trust-ring-key-image call is checked against it from then on.
Questions about trust-ring-key-image
Compute the key image for the active identity in a specific election context. Use this to pre-check whether the active identity has already signed in an election without creating a full signature. The key image is deterministic: same key + same electionId always produces the same image. It is categorised as a Read tool in the Nostr Bray MCP Server, which means it retrieves data without modifying state.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for trust-ring-key-image: 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 Nostr Bray. Nothing to install.
trust-ring-key-image is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the trust-ring-key-image 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.
Set action: deny in the PolicyLayer policy for trust-ring-key-image. 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.
trust-ring-key-image is provided by the Nostr Bray MCP server (nostr-bray). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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