Clear DefinitionsCross-Chain Identity (DID across chains)
1 min read
Pronunciation
[kraws-cheyn ahy-den-ti-tee]
Analogy
Think of cross‑chain identity like a global passport that is accepted at customs in many countries, rather than needing a separate ID for each nation.
Definition
A decentralized identifier (DID) framework that allows a single self‑sovereign identity to be recognized and verified across multiple blockchain networks. It links on‑chain credentials and attributes under a unified DID document model.
Key Points Intro
Cross‑chain identity enables portable, verifiable digital identities across heterogeneous blockchains.
Key Points
Universal DID: One identifier usable on Ethereum, Polkadot, Cosmos, etc.
Verifiable credentials: Issuers can attest attributes on any chain.
Decoupled keys: Key management can span multiple networks.
Interoperability: Standard DID methods (e.g. did:iov, did:ethr) ensure compatibility.
Example
A user creates a DID on Ethereum, then uses the same DID to authenticate to a DeFi app on Binance Smart Chain and to mint an NFT on Polygon, with all attestations resolving to the same identity.
Technical Deep Dive
Cross‑chain DIDs store a DID document on a primary chain, referencing service endpoints on others. DID methods implement `create()`, `update()`, `deactivate()` on respective smart contracts. Off‑chain resolvers fetch the canonical document via interop protocols (e.g. IBC, CCIP) and merge attribute proofs anchored by Merkle roots.
Security Warning
Key compromise on one chain can jeopardize identity across all linked chains; use hardware wallets and threshold key schemes.
Caveat
Not all chains support the same DID methods; resolution may require trusted relayers or oracles.
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