Blankas

io.github.sirsinatoriai-pngPublished by GitHub account sirsinatoriai-pngv0.1.0Updated Oct 27, 2026

Numbered, signed blank forms for agent-to-agent deals: issue, co-sign, verify and mark.

VerifiedStreamable HTTPWeb executableDeveloper ToolsSecurity & Monitoring

Overview

AI-generated overview

Blankas lets AI assistants issue, co-sign, verify and timestamp numbered agreements between two AI agents, storing only deal hashes.

What you can do
  • Issue numbered, issuer-signed blank forms for a deal, contract, order or service terms
  • Sign and co-sign the same terms with each party's own keys, so both hold proof of agreement
  • Verify a co-signed agreement, checking the issuer signature, the terms and both party signatures
  • Look up timestamped marks (proofs) of an agreement by blank ID
  • Read the spec for form fields, canonical JSON, deal hash and Ed25519 signing rules
  • Check service status, issuer public key and remaining free blanks
When to use it
Use it when two AI agents need a verifiable, co-signed record of an agreement, contract, order or service terms, and you want a third-party check or dispute evidence rather than a plain text exchange.
Requirements
A remote streamable HTTP endpoint; no package, environment variable or header is declared. The assistant needs network access to the hosted service, and each party needs its own signing keys, with signing done by a local signer referenced from the service status.
Before you install
Agreements involve signing keys: the server states private keys must never be sent, so signing should happen locally. Marks keep only the deal hash, not the terms, and are retained 72 hours. Issuing a blank consumes one of a limited number of free blanks. Verification and marking write records to a third-party service.

Installation

In SourceWeft

  1. Open Blankas in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.sirsinatoriai-png%2Fblankas/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "blankas": {
      "type": "http",
      "url": "https://pvl.app.n8n.cloud/mcp/blankas-mcp"
    }
  }
}

Tools

6

blankas_marks

Look up timestamped proofs (marks) of an agreement between AI agents by blank ID.

Parametersblank_idrequired

blankas_mark

Timestamp proof that both AI agents signed an agreement: registers only the deal hash, never the terms. Kept 72 hours.

Parametersblankrequireddeal_hashrequiredsignaturesrequired

blankas_verify

Verify a co-signed agreement between AI agents. The document parameter must be the complete JSON object {blank, content, deal_hash, signatures}, not text. Checks the issuer signature, the terms and both party signatures; use it as proof of agreement or dispute evidence. Free. To look up timestamped marks by blank ID, use blankas_marks instead.

Parametersdocumentrequired

blankas_issue

Start a verifiable agreement between two AI agents: issues a numbered, issuer-signed blank form for a deal, contract, order or service terms. Both parties then sign the same terms with their own keys, so each holds proof of agreement. Uses one free blank. Never send private keys.

Parametersparty_arequiredparty_brequired

blankas_spec

How to make a verifiable, co-signed agreement (contract) between two AI agents with Blankas: form fields, canonical JSON, deal hash and Ed25519 signing rules.

Takes no parameters.

blankas_info

Status of Blankas, a free service for verifiable agreements between AI agents: issuer public key, free blanks left, links to the spec and to the local signer. Call this first.

Takes no parameters.

Version history

1
  1. v0.1.0LatestOct 20, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.