Hash Chain implementation using Blake2b

Append-only JSONL action ledger with hash-chain verification for Axtary.

Framework-agnostic Verifactu (AEAT) invoice submission, SIF hash chain and QR generation for Node.js.

Standalone audit chain verifier for Undisk MCP — verify hash-chain integrity of audit exports offline

CLI to independently verify an ARKNA evidence bundle. Recomputes the SHA-256 step hash chain offline. No server access required.

Live-capture SDK for traceglass: record agent runs with a hash chain fixed at capture time

TypeScript definitions for hash-chain

Core engine for governed, versioned, AI-ready context — selectors, hash-chain versioning, graph traversal, and integrity verification for LLMs and agents

Shared offline verification core for AGLedger audit chains: COSE_Sign1 (RFC 9052) decode/verify, Ed25519, hash-chain walk, Merkle proofs, and the canonical failure taxonomy. One dependency (cborg); no network. The single source of truth the SDK, CLI, MCP

Demonstrable integrity for bpmn-react governance: hash-chain ledger verification (verifyLedger), canonical promotion attestations (attestVersion) and XES export for process mining. Zero runtime dependencies.

Verify ProofLink receipts — the Trust & Accountability Layer for Autonomous AI by iTechSmart. Full cryptographic verification (SHA-256 hash chain + Ed25519 signatures) against the live public ledger. Don't trust the AI. Trust the math.

AgentAuth protocol — Zod schemas, types, error codes, audit hash-chain.

Cross-surface audit-event substrate for the AbsoluteJS ecosystem — append-only event log with pluggable sinks, optional hash-chain tamper-evidence, and live-wire helpers that thread sync mutations, queue jobs, runtime exits, and secret rotations into one

AgentPassport wire-format protocol — Zod schemas, error codes, audit hash-chain, spec.

Tamper-proof audit hash-chain kernel shared across Happy Technologies products: keyed HMAC-SHA256 entry hashing, chain verification, and an optional Postgres single-writer helper. Domain-agnostic; products own their audit_log schema and migrations; app ow

Independently verify CloakLLM audit artifacts (hash chain, RFC 3161 timestamps, KeyManifest provenance, compliance reports) without the PII-detection stack or trusting CloakLLM's code.

Implementation of JSON Web Signatures

Mudra — hash-chain sealed zero-knowledge virtual machine

Zero-LLM-dep cryptographic evidence primitives for AI decision attestation and agent session recording. Ed25519 signing, hash chain, batch attestation, and streaming session bundle API. Independently verifiable offline.

Verify a Countersign ledger entry offline: hash-chain recomputation, RFC 6962 Merkle inclusion, and Ed25519 signatures — zero hosted dependencies.