Sigma Auth vs Block Genomics — Nexus Protocol
Sigma Auth is a plugin bundle for AI coding tools published by b-open-io. Marketplaces we read that list it: 1 (Community GitHub marketplaces). Block Genomics — Nexus Protocol is an MCP server published by BitmapAsset. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-15. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Sigma Auth |  Block Genomics — Nexus Protocol |
|---|---|---|
| Community marketplace b-open-io/claude-plugins | Listed Version: 0.0.8 Forks (GitHub): 1 Stars (GitHub): 0 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.1.2 Downloads/month (npm): 182 Downloads/week (npm): 39 Forks (GitHub): 0 Stars (GitHub): 1 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Sigma Auth | Block Genomics — Nexus Protocol |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 0 (worse) | 1 (better) |
| Forks (GitHub) (differs) | 1 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (block-genomics-mcp) |
| Transport (differs) | Not stated | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 5, secrets among them: 2 |
| Parts of the bundle (differs) | 8 | Not a bundle |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/b-open-io/better-auth-plugin | github.com/bitmapasset/block-genomics-nexus |
| Changes in the last 7 days (differs) | 2 | 0 |
| First seen (differs) | 2026-10-15 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Sigma Auth
Sigma Auth - Bitcoin-native OAuth with Better Auth, BAP identity, bitcoin-auth diagnostics, and comprehensive setup guides
Block Genomics — Nexus Protocol
Prove Bitcoin block ownership via BIP-322 and register sovereign AI agents on the Nexus Protocol.
How to run each
Sigma Auth As a Claude Code plugin
/plugin marketplace add b-open-io/claude-plugins
/plugin install sigma-auth@b-open-ioBlock Genomics — Nexus Protocol As a local MCP server: npm package
claude mcp add --env "BG_AGENT_TOKEN=<YOUR_BG_AGENT_TOKEN>" --env "BG_API_KEY=<YOUR_BG_API_KEY>" --transport stdio block-genomics-mcp -- npx -y block-genomics-mcpRequires: BG_AGENT_TOKEN (secret), BG_API_KEY (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
The marketplaces of Sigma Auth publish no settings it asks for, so we do not compare settings.
What it can do: Sigma Auth · What it can do: Block Genomics — Nexus Protocol · Compare two other plugins
Data comes from public marketplace files in GitHub repositories of their authors. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.