Defines the core cryptographic abstraction layer (Keypair, operations, DID key parsing) with implementations for P-256 and secp256k1 curves. Isolated, well-tested, and reusable for any identity or authentication system requiring key generation, signing, verification, and DID document construction.

A comprehensive custom schema validation library for AT Protocol Lexicons, defining primitives (string, integer, object, array, union, ref, etc.) with composable constraints and validation logic. Can be extracted as a standalone validation framework due to its clean interface and zero internal dependencies beyond basic utilities.

An abstract store interface with concrete memory and Redis implementations, supporting TTL, size limits, LRU eviction, and error swallowing for graceful degradation. Demonstrates high-quality abstraction and is easily reusable in any Node.js application needing cache with consistent API.

Provides low-level data utilities for CID, Blob, Uint8Array manipulation, base64 encoding/decoding, and UTF-8 grapheme length. These are isolated, well-tested, and directly reusable for any application dealing with IPLD/CID data or binary string encoding.

Implements TID (timestamp+clockid) generation for sorting identifiers, used extensively for record keys and cursors. A self-contained utility with low overhead, easily extractable for any system needing distributed, sortable unique IDs.