A new Ethereum account type where the address is derived from a Merkle root of spending conditions — not from a public key.
auth_root = merkle_root([leaf_0, leaf_1, ..., leaf_n])
address = keccak256(tagged_hash("HCAAddr", auth_root))[12:]
No public key enters the derivation chain. Quantum safety is structural.
- EIP Draft: EIP-8215
- Discussion: Ethereum Magicians
- Reference Implementation: hca-rs (Rust)
- Organization: github.com/eth-hca
| File | Description |
|---|---|
| CONCEPT.md | Canonical concept definition |
| REFERENCES.md | Full bibliography — EIPs, BIPs, papers, standards |
| FAQ.md | 40+ frequently asked questions |
| eip-8215.md | Copy of the submitted EIP draft |
CC0 — public domain.