What can you do with this server?

The otskit-mcp server enables AI agents and users to create, manage, verify, and monitor cryptographic Bitcoin timestamps for files and hashes using the OpenTimestamps protocol. * create_timestamp: Stamp a SHA-256 hash on Bitcoin by submitting it to four public OTS calendars (alice.btc, bob.btc, finney, catallaxy), receiving a stamp ID for tracking. * stamp_file: Hash a local file and stamp it on Bitcoin in one step — only the hash is sent externally, never the file contents. * hash_file: Compute the SHA-256 hash of a local file and return it as a hex string, with no network calls or data stored. * upgrade_timestamp: Check whether a pending stamp has been confirmed in Bitcoin by fetching the latest merkle tree from the calendars; safe to call repeatedly. * verify_timestamp: Verify a proof against the Bitcoin blockchain via an Esplora API, confirming a hash existed before a specific Bitcoin block height. * inspect_timestamp: Read a stored local proof file without any network calls, returning metadata such as attestations and confirmation status. * list_pending: Query the local SQLite database for stamps filtered by status (pending, confirmed, failed, timeout), with pagination and age filters. * watch: Open a terminal window that continuously monitors pending stamps and attempts upgrades at a configurable interval (minimum 15 minutes).

Which integrations are available for this server?

Enables AI agents to create, upgrade, verify, and inspect Bitcoin timestamps using the OpenTimestamps protocol, providing cryptographic proof of existence for documents at a specific point in time on the Bitcoin blockchain.

otskit-mcp

by OTSkit

Overview Schema Related Servers Score Discussions

TypeScript

@otskit/mcp

npm version npm downloads TypeScript Node Coverage Quality Gate License

OpenTimestamps MCP server - stamp, upgrade, and verify Bitcoin timestamps via AI agents.

Exposes a set of tools to any MCP-compatible agent so it can timestamp documents, monitor confirmation status, and verify proofs against the Bitcoin blockchain - all from a conversation.

Note on confirmation times: After stamping, a proof is pending until Bitcoin confirms it. Confirmations typically arrive within ~60 minutes, but can take several hours during network congestion. Use ots-mcp watch or upgrade_timestamp to monitor. A pending proof is not a failed proof.

Install

npm install -g @otskit/mcp

Related MCP server: @unfakable/mcp

Agent setup

ots-mcp setup claude        # Claude Desktop
ots-mcp setup claude-code   # Claude Code CLI
ots-mcp setup codex         # Codex CLI

Each command writes the MCP entry into the agent's config file, makes a .bak backup if the file already exists, and skips if ots-mcp is already configured. Restart the agent afterwards to apply the changes.

CLI commands

Command	Description
`ots-mcp serve`	Start the MCP server (stdio transport)
`ots-mcp stamp <sha256>`	Stamp a SHA-256 hash against Bitcoin calendars
`ots-mcp upgrade <id>`	Check if a pending stamp has been confirmed
`ots-mcp verify <id>`	Verify a stamp against Bitcoin
`ots-mcp list [status]`	List stamps (`pending` / `confirmed` / `failed`)
`ots-mcp watch [minutes]`	Monitor pending stamps and attempt due upgrades (default: 30 min, minimum: 15 min)
`ots-mcp check-pending`	Run one upgrade pass over all pending stamps
`ots-mcp scheduler install\|remove\|status`	Manage OS-level scheduler for auto-upgrades
`ots-mcp backup [dest]`	Backup the SQLite database
`ots-mcp setup <claude\|claude-code\|codex>`	Configure MCP for an agent

MCP tools exposed to agents

Tool	Description
`create_timestamp`	Stamp a SHA-256 hash against 4 public OTS calendars
`upgrade_timestamp`	Check if a pending stamp has been confirmed in Bitcoin
`verify_timestamp`	Verify a stamp - proves hash existed before a given Bitcoin block
`inspect_timestamp`	Inspect a stored proof file without network calls
`list_pending`	List stamps with status, retry count, and filters
`watch`	Open a terminal window monitoring pending stamps and attempting due upgrades
`hash_file`	Compute the SHA-256 of a local file and return it as a 64-char hex string (no network calls)
`stamp_file`	Compute SHA-256 of a local file and stamp it on Bitcoin in one step

Data directory

All data is stored in ~/.ots-mcp/:

~/.ots-mcp/
  ots-mcp.db       # SQLite database (stamps, proof files)
  config.json      # Optional config overrides
  ots-mcp.log      # Log file

Configuration

Create ~/.ots-mcp/config.json to override defaults:

{
  "stamp_enabled": true,
  "scheduler_interval_minutes": 30,
  "retry_max_attempts": 20,
  "calendar_timeout_ms": 10000,
  "calendars": [
    "https://alice.btc.calendar.opentimestamps.org",
    "https://bob.btc.calendar.opentimestamps.org",
    "https://finney.calendar.eternitywall.com",
    "https://btc.calendar.catallaxy.com"
  ]
}

Development

npm run build    # production build
npm run dev      # watch mode
npm test         # run tests

Dependencies

@otskit/client - OTS calendar client (brings in @otskit/core, the protocol engine)
@modelcontextprotocol/sdk - MCP SDK
node-sqlite3-wasm - local database (pure WASM, no native compilation)

Requires Node.js >= 20.

Install Server

license - permissive license

quality

maintenance

How are these scores calculated?

Maintenance

–Maintainers

–Response time

1dRelease cycle

24Releases (12mo)

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