Related · tier-1 reading. For what a portable artifact actually is, see Portable Artifact.
The same H33-74 receipt can be anchored to one chain, five chains, or fifty. The receipt does not change. Only the set of independent notarizations grows.
Most cross-chain attestation systems force you to pick one chain and live with the consequences. Throughput and finality come from that chain. Security guarantees come from that chain. If the chain has a problem, your attestations have a problem.
H33-74 removes that single point of failure by anchoring independently on as many chains as you want.
An H33-74 receipt is a 74-byte object signed under three post-quantum signature families. Once produced, the receipt has a fixed cryptographic identity.
An anchor is a chain transaction that commits to the receipt's identity (directly or via a batched commitment over many receipts). Multiple chains can each hold their own anchor. Each anchor is independently verifiable.
Concretely: a receipt anchored on Bitcoin and Ethereum has two completely independent notarizations. Either anchor alone is sufficient to prove the receipt existed. Both together provide redundancy.
If one chain has a problem (a long reorg, a chain split, an extended outage, eventual deprecation), other anchors continue working. The receipt's notarization survives any single chain's failure.
Different counterparties may prefer different chains. A US institutional auditor may want Bitcoin notarization. A European regulator may want Ethereum. A Solana-native counterparty may want Solana. The same receipt can carry all three anchors so each audience verifies on the chain it knows.
If a chain becomes legally restricted in one jurisdiction, the receipt's other anchors remain valid in jurisdictions where that restriction does not apply. The proof is not held hostage to any single chain's regulatory status.
Cheap chains for routine receipts, expensive but maximally-trusted chains for high-value receipts, with no architectural change. Anchoring strategy can vary by receipt category without affecting how receipts are produced.
This is the operational fact that matters most. Adding a new anchor does not modify the receipt. Adding the tenth anchor does not break the first. Removing the third anchor (if you stop notarizing on that chain) does not invalidate the others.
The 74-byte object is the same in every notarization record. Each chain holds a pointer to it, or a commitment that includes it. The receipt itself is immutable from the moment it is produced.
What differs between blockchains are their operational and integration characteristics — throughput, finality, fee, jurisdiction. The H33-74 primitive and its cryptographic properties remain unchanged. 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.
H33-74 produces and anchors the portable proof primitive. It does not monitor systems for control drift (that is HATS), it does not render the pass/fail verdict on an attestation (an independent verifier does — see Verification), and it does not govern agents or preserve decision authority (that is Agent-008). Multi-anchoring is a property of the primitive, not a separate product.
Multi-chain anchoring is what turns the chain into infrastructure rather than architecture.
The Chain Is Infrastructure Why Chain Migration Shouldn't Exist