GBA Blockchain Maturity Model (BMM) Plugin

A Claude Code plugin that acts as a blockchain maturity readiness consultant, helping you assess your solution against the Government Blockchain Association's Blockchain Maturity Model.

What it does

Walks you through a structured 6-phase consultation:

1. Context — Understands your solution, domain, stakeholder role, and goal
2. Evidence inventory — Maps your existing artifacts to BMM level requirements
3. Integrity check — Tests whether the solution meets the bedrock principles of decentralization and distribution
4. Element walkthrough — Scores each of the 11 elements, explains evidence standards, and gives actionable gap-closing recommendations
5. Readiness assessment — Produces a maturity scorecard, overall rating, top risks, and next steps
6. Formal assessment prep — Walks through BAP engagement, team composition rules, conflict requirements, and a pre-assessment checklist

Prerequisites

• Claude Code installed and working (claude command runs in your terminal)

Install

Clone the repo from GitHub:

git clone https://github.com/blockchain-working-group/gba-bmm-skill.git

Then choose one of the install methods below.

Option A: Global slash command (recommended)

Makes /gba-bmm available in every Claude Code session, across all projects:

mkdir -p ~/.claude/commands
cp gba-bmm-skill/gba-bmm.md ~/.claude/commands/gba-bmm.md

Option B: Project-level slash command

Makes /gba-bmm available only when working inside a specific project:

cd your-project
mkdir -p .claude/commands
cp /path/to/gba-bmm-skill/gba-bmm.md .claude/commands/gba-bmm.md

Option C: Plugin mode

Loads the full plugin structure for a single session:

claude --plugin-dir ./gba-bmm-skill

The skill will be available as /gba-bmm:bmm-readiness for that session.

Verify installation

Launch Claude Code and type:

/gba-bmm

If the skill loads, it will ask about your blockchain solution. If nothing happens, verify the file is in place:

ls ~/.claude/commands/gba-bmm.md

Update

Pull the latest version and re-copy:

cd gba-bmm-skill
git pull
cp gba-bmm.md ~/.claude/commands/gba-bmm.md

Uninstall

# Global
rm ~/.claude/commands/gba-bmm.md

# Project-level
rm .claude/commands/gba-bmm.md

Use

Invoke the skill and describe your solution or goal:

/gba-bmm we have a supply chain tracking solution on Hyperledger Fabric preparing for a GBA assessment

Or invoke it without arguments and the skill will walk you through the intake questions:

/gba-bmm

The consultation follows 6 phases: context, evidence inventory, integrity check, element walkthrough, readiness scorecard, and formal assessment prep.

Plugin Structure

gba-bmm-skill/
├── .claude-plugin/
│   └── plugin.json              # Plugin manifest
├── skills/
│   └── bmm-readiness/
│       └── SKILL.md             # Main skill prompt
├── gba-bmm.md                   # Legacy slash command format
└── README.md

Who this is for

• Solution providers preparing for a GBA BMM assessment
• Investors evaluating blockchain solution maturity
• Acquisition professionals benchmarking proposals against a common standard
• Government program offices conducting internal readiness reviews

The 11 Elements

Element	What it assesses
Distribution	Node hosting concentration risk
Governance	Management of assets, nodes, protocols, smart contracts
Identity Management	Access controls, KYC/AML, anonymity (domain-sensitive)
Interoperability	Cross-chain and legacy system integration
Performance	Throughput, latency, finality, cost
Privacy	PII protection, encryption, GDPR compliance
Reliability	Fork resolution, error handling, fraud controls
Resilience	Fault tolerance, continuity of operations
Security	End-to-end controls across the full stack
Infrastructure Sustainability	Lifecycle resource availability
Synchronization	Consensus mechanisms, finality

Important

This plugin is a preparation coach, not a formal assessment. Only GBA Authorized Assessment Partners (BAPs) conduct official BMM assessments. See the GBA Blockchain Maturity Model for the formal program.

Source

Based on the GBA Blockchain Maturity Model Overview document (January 14, 2023, Approved). The BMM is developed and maintained by the Government Blockchain Association.