Welcome

Welcome to the official documentation for Obsidian Chain — the first EVM-compatible blockchain with a native on-chain messaging layer.

What is Obsidian?

Obsidian is a custom Ethereum chain designed for permanent, decentralized data. While Ethereum excels at value transfer and smart contracts, Obsidian adds a dedicated messaging layer that stores signed data blobs directly on-chain — no smart contracts required.

Think of it as a blockchain built for content that needs to exist forever: social posts, attestations, records, proofs, and any data that shouldn't be deletable.

Quick Links

• Why Obsidian Exists

• Key Features

• How It Works

• Build on Obsidian

• RPC Reference

Network Information

Property	Value
Chain ID	421 (0x1a5)
Block Time	6 seconds
Message Block Interval	Every 2nd block (12 seconds)
Native Token	OBS
EVM Compatible	Yes (full Ethereum tooling support)

Get Started

For App Developers: → Use Cases & Ideas → RPC Reference

For Node Operators: → Archive Node Economics → Sharded Archives

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Obsidian Chain — Permanent, decentralized data on Ethereum.