The on‑chain internet — open standards, tools, and research for Hedera Consensus Service (HCS).
Hashgraph Online is a consortium building the on‑chain internet on Hedera’s Consensus Service (HCS).
We author open Hashgraph Consensus Standards (HCS), ship production‑grade tooling, and support implementers across the ecosystem.
Audience: developers, protocol/standards authors, and builders moving real apps to fully on‑chain infrastructure.
# SDK
npm i @hashgraphonline/standards-sdk
# Docs
# → https://hashgraphonline.com/docs/standardsSelected HCS specs used across the ecosystem:
- HCS‑1 (File Storage & Retrieval) · HCS‑2 (Discovery Registries) · HCS‑3 (Resource Linking & Recursion)
- HCS‑5 (Dynamic NFTs / Hashinals) · HCS‑6 (Time‑Based Evolution)
- HCS‑8 (Governance & Voting) · HCS‑9 (Modular Governance)
- HCS‑10 (AI Agent Communication / OpenConvAI) · HCS‑11 (Identity Profiles) · HCS‑13 (Schema Registry)
- HCS‑20 (Auditable Points)
Browse all standards → https://hashgraphonline.com/docs/standards
- Standards & Site —
hcs-improvement-proposals: canonical specs & docs. - Standards SDK —
standards-sdk: TypeScript SDK for HCS standards. - Agent Kit —
standards-agent-kit: utilities for OpenConvAI/agent apps. - Desktop (reference app) —
desktop: UI to explore and interact with on‑chain agents.
See all repositories at https://github.com/hashgraph-online.
- New or updated standard? Open a discussion/PR in
hcs-improvement-proposalswith motivation, spec text, and references. - Code contributions? Use issues/PRs in the target repo; follow each repo’s
CONTRIBUTING.md&CODE_OF_CONDUCT.md. - Security reports: follow the
SECURITY.mdin the relevant repo.
- Telegram: https://t.me/hashinals
- X (Twitter): https://x.com/HashgraphOnline
- Brand kit (logos/colors): https://hashgraphonline.com/brand
- Blog & updates: https://hashgraphonline.com
Unless noted otherwise, Hashgraph Online software is released under Apache‑2.0.
Check each repository’s LICENSE for details.