# Bitcoin OP_RETURN

> Use this tool when you need to permanently embed custom text messages in the Bitcoin blockchain, enabling secure and transparent data storage. It solves problems related to decentralized data management and provides an interface for generating Lightning invoices and retrieving stored messages through conversational AI interfaces. Ideal for use cases requiring immutable data storage, such as digital notarization or proof-of-existence, with inputs including custom messages and outputs including permanently embedded blockchain data.

Canonical page: https://skillsregistry.net/skills/benthecarman-bitcoin-op-return  
JSON: https://api.skillsregistry.net/v1/skills/benthecarman-bitcoin-op-return

## Description

MCP-OP-Return is a server implementation that bridges Bitcoin's blockchain with AI assistants by integrating with opreturnbot.com. It enables users to create Bitcoin transactions with OP_RETURN outputs containing custom messages, permanently embedding text in the blockchain through a Lightning Network payment flow. The server exposes tools and prompts that allow MCP clients to generate Lightning invoices for message embedding and retrieve previously stored OP_RETURN messages from transactions, making blockchain data interaction accessible through conversational AI interfaces.

## Trust

- **Trust score (0–1):** 0.97
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-09-19

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/benthecarman-bitcoin-op-return)
- **Repository:** <https://github.com/benthecarman/mcp-op-return>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "benthecarman-bitcoin-op-return"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/benthecarman-bitcoin-op-return` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/benthecarman-bitcoin-op-return/pull`

---
SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt