A dev-grade local protocol for agent accountability — not a product. One install gets you the protocol and RailHub Studio free; build your own client if you’d rather. Runs on your machine, wires into your tools, and stamps every agent action with an Ed25519-signed receipt you can verify offline. Nothing leaves your box.
Everything runs on 127.0.0.1. Your code, your keys, your receipts — minted and stored on your machine. Nothing leaves your box.
127.0.0.1 · your hardware33 MCP tools out of the box. Plugs into any MCP client you already use. Wire the protocol to any program — you own and customize the code.
33 tools · any MCP clientEvery agent action passes a human-approved airlock and lands with an Ed25519-signed receipt. Verifiable offline, by anyone, forever.
airlock · Ed25519 receiptsThe protocol is $0 forever — unlimited users and machines. Start here, ship an audited agent action before your coffee cools.
One line. The installer sets up the protocol locally, mints your signing keys on-device, and arms the airlock.
139 integrations available. Connect the tools your agents touch — credentials stay on your machine.
Agent actions stage first. You approve. Then they execute — machine-to-machine, on your box.
Ed25519 signatures check out with zero network calls. Hand a receipt to anyone; they can verify it without trusting you or us.
Building, publishing, and selling on the marketplace is free. 32 modules live from ~20 publishers already. Flat 5% seller fee plus 10% buyer assurance — publishers keep 95% of list price.
Publish a moduleSupport and community live on Discord. Real developers, real answers — from install snags to receipt-chain deep dives.
community threads and counting
No ticket queues. No forms. Ask anything — protocol internals aside, we'll tell you exactly how it behaves and why. Publishers, tinkerers, and the core team hang out here.