did:cow, a proposal for an ID resolution method with most of the convenience of did:plc/did:web and the robustness of a public blockchain
clean up resolved json doc
+20
-25
+20
-25
README.md
+20
-25
README.md
···
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## 10. Example DID Document
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This example shows a did:cow ID wrapping a did:plc identity. The resolved document is the underlying did:plc document with three modifications: the `id` is replaced with the did:cow identifier, and a `did:cow` block is added carrying the Ethereum controller address (as a did:pkh DID) and the wrapped DID for client validation.
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Given:
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```
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did:cow:8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be:web:example.com
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did:cow:8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be:plc:pyzlzqt6b2nyrha7smfry6rv
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```
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Wrapping:
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```
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did:web:example.com
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did:plc:pyzlzqt6b2nyrha7smfry6rv
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```
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Resolved DID Document:
···
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{
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"@context": [
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"https://www.w3.org/ns/did/v1",
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"https://w3id.org/security/suites/jws-2020/v1"
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"https://w3id.org/security/multikey/v1"
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],
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"id": "did:cow:8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be:plc:pyzlzqt6b2nyrha7smfry6rv",
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"did:cow": {
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"controller": "did:pkh:eip155:1:0x8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be",
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"wrappedDid": "did:plc:pyzlzqt6b2nyrha7smfry6rv"
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},
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"alsoKnownAs": [
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"at://user.bsky.social"
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],
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"id": "did:cow:8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be:web:example.com",
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"controller": "0x8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be",
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"verificationMethod": [
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{
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"id": "did:web:example.com#key-1",
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"type": "JsonWebKey2020",
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"controller": "did:cow:8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be:web:example.com",
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"publicKeyJwk": {
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"kty": "EC",
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"crv": "secp256k1",
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"x": "...",
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"y": "..."
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}
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"id": "did:plc:pyzlzqt6b2nyrha7smfry6rv#atproto",
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"type": "Multikey",
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"controller": "did:plc:pyzlzqt6b2nyrha7smfry6rv",
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"publicKeyMultibase": "zQ3shRQWmWxEtxRa317rpYnVo7nWxYAsDS4mBwdDLgLfkkDtR"
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}
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-
],
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"authentication": [
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"did:web:example.com#key-1"
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],
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"service": [
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{
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"id": "#wrapper-metadata",
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"type": "COWWrapper",
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"serviceEndpoint": {
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"wrapped_did": "did:web:example.com",
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"wrapper_controller": "0x8BC101ABF5BcF8b6209FaaAD4D761C1ED14999Be",
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"on_chain_state": true,
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"last_updated": "2026-02-16T10:30:00Z"
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}
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"id": "#atproto_pds",
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"type": "AtprotoPersonalDataServer",
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"serviceEndpoint": "https://bsky.social"
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}
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]
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}