Topic Registry
Signal Archive publishes its Hedera topics through a public HCS-2 registry so third parties can independently discover and verify the archive structure without relying on this website.
Registry topic
The registry itself is an HCS-2 indexed topic on Hedera Mainnet. Each message in this topic is a standardized registration record for one of Signal Archive's operational HCS topics. Anyone can read the full registration history directly from the ledger.
Registered topics
SHA-256 content hashes of archived tweets from tracked public figures, submitted at time of capture. Each message attests that a tweet existed with specific content at a specific consensus timestamp.
What is HCS-2?
HCS-2 is a Topic Registry standard for the Hedera Consensus Service. It provides a standardized way to publish and discover HCS topics, making archives and protocols legible to external builders, auditors, and indexers without relying solely on a website or documentation.
By publishing this registry, Signal Archive ensures that the authoritative topic list is itself on-chain and independently verifiable, not just stated in copy on this page.
Registry topic 0.0.10388911 was created on Hedera Mainnet on March 22, 2026. Registration messages follow the HCS-2 standard JSON format with fields p, op, t_id, and metadata.