Friendliest JAM implementation
A welcoming, Gray Paper–aligned stack: type-safe consensus, PVM, and tooling in TypeScript. Run on Node, Bun, or in the browser—one codebase, shared with your apps, built to get you shipping.
Why PBNJ
Gray Paper–aligned building blocks that are easy to integrate and verify.
Safrole
Battle-tested consensus: ticket generation, sealing, and epoch markers with fallback sealing so your chain keeps going when it matters.
PVM
Gray Paper–compliant PVM that runs the same everywhere—host functions, RAM, and refinement invocations with no spec surprises.
JAMNP-S
Modern networking over QUIC and TLS 1.3: block announcement, work packages, ticket distribution, and audits without the protocol headaches.
Codec & types
One type system and serialization story: blob and program decoding, extrinsic hashing, and shared types that stay in sync with the spec.
Erasure & assurance
Data availability you can verify: erasure coding and assurance tooling that match the Gray Paper so you can trust the data.
RPC & tooling
Production-ready JIP-2 RPC, WebSocket subscriptions, and node services for validators, guarantors, and builders—integrate and go.
We follow the Gray Paper as the authoritative spec and prove it with official jamtestvectors—so you get compliance without the guesswork.