Cross-Chain Identity: Unified Credentials Across Blockchains
Definition
Cross-chain identity inherits from H33-74, which produces a portable post-quantum attestation that carries a credential's meaning across networks. This page uses that primitive; it does not redefine it. The independent judgment that a credential is authentic on any given chain is rendered by Verification (uses, is not), and custody or rotation of the underlying identity keys is held by H33-Key (uses, is not). Portability begins where key custody ends: that boundary is owned by H33-Key.
Why it matters: This page exists to show how one H33-74 attestation is designed to be recognized across chains without re-issuing the credential on each.
Identity should be portable across chains. Bridge credentials between Ethereum, Solana, and other networks. Verify once, use everywhere.
Approaches
Hash-based attestation bridging. Cross-chain messaging protocols. Chain-agnostic credential formats.
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Get Free API Key →Frequently Asked Questions
What makes an identity credential portable across chains?
Portability comes from the attestation, not the chain. H33-74 produces a compact post-quantum attestation that binds the credential to its content so the same proof carries meaning on Ethereum, Solana, or any other network without being re-issued per chain.
How is a cross-chain credential checked as authentic?
The credential is not trusted on assertion. Verification re-derives the artifact and renders an independent verdict on whether the attestation is authentic, so any relying party on any chain can confirm it without contacting the issuer.
Who holds the identity keys behind a portable credential?
Custody, multisig, and rotation of the underlying identity keys are held by H33-Key. H33-74 produces the portable attestation from those keys; H33-Key owns the keys themselves.
See also: H33-74 · Verification · H33-Key