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Add cross-chain verification examples#41

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chongkan:cross-chain-verification-examples
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Add cross-chain verification examples#41
chongkan wants to merge 1 commit into
w3c-ccg:mainfrom
chongkan:cross-chain-verification-examples

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Summary

Adds a Cross-Chain Verification Examples section with 3 practical scenarios:

  1. Verify did:sns credential via did:pkh — verifier without Solana resolver uses did:pkh as key proof (same Ed25519 key, no network call needed)
  2. Multi-chain identity fan-out — ETH + SOL accounts linked via alsoKnownAs graph, with did:pkh as chain-specific key proofs and did:ens/did:sns providing services
  3. SIWE → credential presentation — standard wallet connection (Sign-In With Ethereum) → alsoKnownAs discovery → SD-JWT VP exchange across three DID methods

Why this matters

did:pkh's "Combination with other DID methods" section describes upgrade paths conceptually. These examples show the concrete verification flows, demonstrating did:pkh's value as a universal cryptographic bridge without changing its generative nature.

Related: #38 | W3C tracking

Signed-off-by: Eduardo Chongkan e.chongkan@gmail.com

3 examples showing did:pkh as cryptographic bridge:
1. Verify did:sns credential via did:pkh (no Solana resolver needed)
2. Multi-chain identity fan-out (ETH + SOL linked via alsoKnownAs)
3. SIWE authentication → credential presentation (wallet → VP flow)

Addresses w3c-ccg#38

Signed-off-by: Eduardo Chongkan <e.chongkan@gmail.com>
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