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did:cow is a proposed decentralized identifier aimed at providing stronger guarantees for identities used in ATProto.
A did:cow ID consists of a pointer at a did:web or did:plc ID, and an address on the Ethereum network that can update it.
An ID can be created for free without a blockchain transaction. You only need to send a blockchain transaction if you want to point it at a different did:web or did:plc ID, or change the blockchain address that controls it.
Example
Specification
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API
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Contract on testnet
No transaction required — a did:cow identifier is formed from your controller address and wrapped DID.
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