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View tag derivation after KEM

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  • ERC-8441: Hybrid post-quantum stealth address scheme
    thread2026-10-09

    View tag is derived from a domain-separated SHA-256 digest of ss computed after the KEM step, specifically so a quantum adversary cannot use an ECDH-only-derived tag to rule out most candidate recipients.

  • Hybrid post-quantum stealth addresses (ERC-5564 schemeId 3)
    thread2026-10-09It is written here as View tag derivation after KEM (not from ECDH secret alone).

    Defensive technique: computing the view tag from a digest that depends on the post-quantum shared secret, not just the ECDH secret, so a quantum adversary cannot use the tag alone to rule out most candidate recipients

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