Tamper-evident, verifiable append-only logs & maps for TypeScript — RFC 6962 Merkle trees with inclusion & consistency proofs, Ed25519 signed checkpoints, and a sparse Merkle verifiable map. Zero dependencies.

Python object-oriented implementation of hash tree, originally used as a module in university project

Browser-based Key Transparency demo — append-only authenticated map, IETF KEYTRANS. E2EE answers "can anyone read this?" — not "whose key did I encrypt to?" Watch a server equivocate, then build the Merkle consistency proofs and gossip that make the lie findable. The missing layer under X3DH, Double Ratchet, and MLS. No backends. No simulated math.

Self-hostable, single-binary transparency log — an append-only, cryptographically verifiable (RFC 6962 Merkle) record service with Ed25519-signed tree heads. JVM-native via GraalVM. Etched in — can't be erased.