Add alsoKnownAs cross-chain identity linking#39
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New section defining: - alsoKnownAs discovery during resolution (reverse name lookup, companion registry, verifier hints) - Bidirectional verification protocol - Example linked DID Document (did:pkh:solana → did:sns) - Relationship to existing upgrade paths Addresses w3c-ccg#38 Signed-off-by: Eduardo Chongkan <e.chongkan@gmail.com>
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Summary
Adds a new Cross-Chain Identity Linking via alsoKnownAs section, enabling did:pkh to serve as a cryptographic bridge to richer DID methods.
New content
did:pkh:solana:...:CKg5d12J...→did:sns:alice.solDesign philosophy alignment
This does NOT change did:pkh's generative, read-only nature. The
alsoKnownAsproperty is populated during resolution (not stored) via external lookups. The core DID Document generation remains deterministic.Related: #38 | W3C tracking
Signed-off-by: Eduardo Chongkan e.chongkan@gmail.com