Hadamard Onyx
A post-quantum Layer 2 blockchain — ECDSA-free, hash-signature-based, and built as an OP Stack rollup on Ethereum.
The First Hash-Only Layer 2 Chain
Onyx is Hadamard's ECDSA-free Layer 2 rollup on Ethereum — secured entirely by hash-based signatures, with no classical elliptic-curve cryptography. ChainId 42069422. Connect via RPC at bb84.com, bridge assets, and build post-quantum applications today.
Onyx L2 Chain
The Onyx network runs on bb84.com. Bridge ETH and ERC-20 tokens, interact via RPC, manage OTA keys, and monitor chain status — all without classical ECDSA signatures.
Developers
If you want to start coding with Hadamard, we have documentation, tutorials and more on our Github page.
Community
Hadamard is all about community. It' s made up of people from all different backgrounds and interests. Visit our Social Networks to join.
Bridge & Build on Onyx
Move ETH and ERC-20 tokens between Ethereum (Sepolia) and the Onyx L2. Use the OTA Manager to register post-quantum keys, or connect your tooling directly to the RPC endpoint at bb84.com/rpc.
RPC https://bb84.com/rpc
Chain ID 42069422
Network Onyx (OP Stack · Sepolia)
Chain ID 42069422
Network Onyx (OP Stack · Sepolia)
