Publicly verifiable integrity that survives infrastructure changes. The chains are examples. The integrity layer is the concept.
H33 is chain-agnostic. No blockchain occupies a privileged conceptual slot. Bitcoin, Solana, Avalanche, Polygon, Zcash, Ethereum, Arbitrum, Base, Optimism, Cosmos, and Hedera are implementations of the same idea.
Verify a Bundle → See the ArchitectureWhen integrity is anchored to a specific chain, vendor, cloud, or implementation, the evidence dies when the infrastructure changes. H33 inverts that — the artifact is the asset. The chain is the proof surface, not the proof.
Portable evidence survives chain migration, cloud migration, vendor replacement, software replacement, and model replacement. The evidence is the asset. Everything else is implementation.
Chains are implementation layers. Integrity is a thesis layer. Mixing them is what produces lock-in.
An H33-74 attestation is verifiable independent of which chain anchored it — or whether that chain still exists.
Every chain we support is interchangeable from the integrity layer's perspective. None is privileged.
Anyone can verify an H33 artifact without contacting H33, without depending on a particular cloud, and without trusting any single chain to remain operational.
Each chain is a proof surface. None is a thesis surface. Pick the chain that matches your operational requirements — the artifact remains identical and independently verifiable across all of them.
The Public Integrity Layer is one of eight Tier-1 thesis concepts. It explains why the H33 substrate exists. Implementation lives in the lower tiers.