get_ots_proof

SERVERFreeSign — Free e-signature SOURCEhttps://free-sign.com/mcp

Low RISK CLASS

Category Read

Parameters 22 required

Recommended Allowedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/com-free-sign-signing/get-ots-proof.md

WHAT IT DOES

What get_ots_proof does on FreeSign — Free e-signature

AI agents call get_ots_proof to retrieve information from FreeSign — Free e-signature without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`anchor_id`	string	Yes
`envelope_id`	string	Yes

Parameters from the server's own tool schema.

RISK

Why get_ots_proof is rated Low

Even though get_ots_proof only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_ots_proof safely

PolicyLayer is an MCP gateway: it sits between your AI agents and FreeSign — Free e-signature, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_ots_proof, this is the rule to start with:

get_ots_proof Allowed

get_ots_proof 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": {
    "get_ots_proof": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect FreeSign — Free e-signature, apply this rule, and every get_ots_proof call is checked against it from then on.

FAQ

Questions about get_ots_proof

What does the get_ots_proof tool do? +

Return the .ots proof (base64) for a given OpenTimestamps anchor on an envelope. Use the official ots-cli to verify offline against Bitcoin block headers. Each seal has two anchors: kind: "byterange" commits to the signed document, kind: "signed_attrs" commits to SHA-256 of the CMS SignedAttributes (which carry the post-quantum key commitment). It is categorised as a Read tool in the FreeSign — Free e-signature MCP Server, which means it retrieves data without modifying state.

What parameters does get_ots_proof accept? +

get_ots_proof accepts 2 parameters: anchor_id, envelope_id. Required: anchor_id, envelope_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on get_ots_proof? +

Register the FreeSign — Free e-signature MCP server in PolicyLayer and add a rule for get_ots_proof: 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 FreeSign — Free e-signature. Nothing to install.

What risk level is get_ots_proof? +

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

Can I rate-limit get_ots_proof? +

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

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

get_ots_proof is provided by the FreeSign — Free e-signature MCP server (https://free-sign.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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