[[atproto-did]]

- DIDs have an initial hard limit of **2048** characters
- The URI is case sensitive and starts with lowercase `did:`
- The method segment is one or more lowercase letters followed by `:`
- Query (`?`) and fragment (`#`) parts are not allowed in atproto
- The URI may not end in `:`

Implementations dont need to validate percent decoding. The percent symbol is
allowed in DID identifier segments, but the identifier _should not end in a
percent symbol_.

```txt
did:plc:z72i7hdynmk6r22z27h6tvur
did:web:blueskyweb.xyz
```