Cryptair Mcp Server
Gives Claude and other MCP clients six tools for cryptographic attestation on Hedera Hashgraph. You can certify a document to get a timestamped on-chain receipt, initiate a two-party attestation where both sides prove they hold the same file, or verify whether something's been tampered with. The server handles agent registration automatically,no signup flow, credentials get persisted locally after first use. Useful when you need verifiable proof of agreement between AI agents or want immutable receipts for documents without uploading the actual files. Both parties' hashes hit Hedera mainnet, so verification is third-party and permanent. Works across Claude Desktop, Cursor, Cline, Windsurf, and anything else speaking MCP over stdio.
- tools
- 6
- auth
- Secret needed
- transport
- STDIO
- env vars
- 3
- last updated
- May 8, 2026
Tools
6 toolsPublic tool metadata for what this MCP can expose to an agent.
certify_document"I want to prove this file existed at this moment."
"I want to prove this file existed at this moment."
No parameter schema in public metadata yet.
verify_document"Has this document been attested before? Is it tampered?"
"Has this document been attested before? Is it tampered?"
No parameter schema in public metadata yet.
initiate_attestation"I want my counterparty to confirm they have the same document I do."
"I want my counterparty to confirm they have the same document I do."
No parameter schema in public metadata yet.
submit_attestation"I received an attestation link from someone — confirm I have the matching file."
"I received an attestation link from someone — confirm I have the matching file."
No parameter schema in public metadata yet.
check_attestation"What's the status of this attestation session?"
"What's the status of this attestation session?"
No parameter schema in public metadata yet.
register_agent"Create a Cryptair account for me so I can authenticate."
"Create a Cryptair account for me so I can authenticate."
No parameter schema in public metadata yet.
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CRYPTAIR_API_KEYsecretOptional. Pre-configured Cryptair API key. If unset, the agent can call register_agent at runtime to self-register and the key is silently stored at ~/.cryptair/credentials.json.
CRYPTAIR_EMAILOptional. Email used as fallback when submit_attestation auto-provisions a counterparty account.
CRYPTAIR_BASE_URLdefault: https://www.cryptair.ioOptional. Override the API base URL for self-hosted or staging environments. Defaults to https://www.cryptair.io.
Readme
Cryptair MCP Server
Cryptographic attestation for AI agents, exposed as native MCP tools.
Lets any MCP-capable agent (Claude Desktop, Cursor, Cline, Windsurf, Zed, …) prove agreements, certify documents, and verify counterparty claims with on-chain receipts on Hedera Hashgraph. Works zero-config out of the box: agents can self-register and start using attestation immediately, with no email verification or human-in-the-loop signup.
What It Does
Cryptair lets two agents (or an agent and a human) prove they agreed on the same digital artifact at a specific moment. Every confirmed agreement is written as a SHA-256 hash to Hedera Hashgraph, producing a permanent, third-party-verifiable receipt.
This MCP server exposes six tools that map cleanly to how agents think:
Details
- Repository
- github.com/syronius/cryptair-mcp-server
- Package
@cryptair/mcp-server- Transport
- STDIO
- Auth
- Required
- Registry
- MCP registry, active