Category · tier-1 reading. This page is one implementation of H33's chain-agnostic integrity thesis. For the concept that spans all 11 supported chains, see Public Integrity Layer.
Anyone recording high-stakes operational evidence needs it to outlive the system that produced it. H33-74 is the primitive that produces and anchors that portable post-quantum evidence — this page shows H33-74 evidence anchored on Optimism. It expresses the H33-74 primitive for the Optimism anchor surface; it does not add a new capability.
H33-74 anchors to Optimism via EIP-1559 calldata commitments. As the founding OP Stack chain, Optimism settlement assurance inherits from Ethereum L1.
What it does not contain: sensitive payload data. The receipt's content lives off-chain. The anchor only commits to its existence and identity.
Optimism is the right anchor when EVM compatibility is required, when established L2 tooling and governance (Optimism Collective) are valuable, and when L1-grade settlement assurance through optimistic rollup is sufficient. Particularly appropriate for governance-heavy use cases that benefit from Optimism's RetroPGF and citizen governance model.
A receipt anchored on Optimism can also be anchored on Bitcoin, Ethereum, Solana, Polygon zkEVM, Zcash, or any other chain H33-74 supports. The anchors are independent. Adding more anchors does not change the receipt. Removing one anchor (or having one chain become unavailable) does not invalidate the others.
If Optimism ever becomes inappropriate for an operator's use case (regulatory, performance, security, cost), the operator adds an anchor on a different chain and continues operating. The historical evidence does not have to migrate, because it was never bound to Optimism.
What differs between blockchains are their operational and integration characteristics. The H33-74 primitive and its cryptographic properties remain unchanged. Cost, finality model, governance, and ecosystem tooling differ between Optimism and, say, Bitcoin — the 32-byte commitment, the three post-quantum signatures, and the verification steps do not.
Migrating from one blockchain to another changes the anchoring substrate and deployment environment. It does not change the H33-74 primitive, the cryptographic evidence, or the verification model. A receipt first anchored on Optimism and later anchored on Ethereum or Solana is the same receipt, proven by the same signatures, checked by the same open verifier.
A third-party verifier needs the H33-74 receipt, the Optimism anchor transaction (or its hash), and the open-source H33 verifier. From those inputs:
H33-74 is the portable proof primitive — a 74-byte post-quantum attestation. Optimism is one interchangeable anchoring substrate that H33-74 evidence can be recorded on. The chain is the transport layer for a notarization; the proof itself is produced and carried by H33-74.
No. Anchoring writes a 32-byte commitment via calldata and inherits an Optimism block timestamp. The cryptographic evidence — three independent post-quantum signatures over the receipt — is unchanged by the choice of chain. H33-74 anchors its evidence to Optimism; the proof and verification come from H33-74's cryptography, not from Optimism.
From H33-74. Optimism contributes one independent existence-time notarization, with settlement inherited from Ethereum L1. Authenticity and unforgeability come from H33-74's signatures and the independent verifier, which behave identically on every chain.
Yes. The same receipt anchors on Bitcoin, Ethereum, Solana, or any supported chain. Migrating from one blockchain to another changes the anchoring substrate and deployment environment. It does not change the H33-74 primitive, the cryptographic evidence, or the verification model.
Both are OP Stack L2s inheriting settlement from Ethereum, so the anchoring mechanics are similar. They differ operationally — governance (the Optimism Collective and RetroPGF vs Coinbase-backed Base), ecosystem, and tooling. The H33-74 primitive and its verification are identical on both.
Legitimate reasons exist to prefer a different chain: Bitcoin for the most conservative settlement, Zcash where confidential-transaction ecosystems matter, Solana or Hedera for higher throughput and low fixed fees, Cosmos where a sovereign app-specific zone is required. Optimism is not always the best fit — but whichever chain you choose, the H33-74 primitive stays portable across all of them, so the choice is an operational one, not a change to the proof.
The same receipts that anchor to Optimism can anchor to any of the others.
One Receipt. Multiple Chains. H33-74 Overview