the BridgeDb Tiwid project ("this is where identifiers die") collects outdated identifiers, and when known, provides information when the identifiers was retired (stopped working) and if there is a replacement identifier.
In the past week two new features got added. ORCIDs can now be provided for who claimed an identifier is retired. Second, the mapping to retired to new identifier are now available as SSSOM. Patches by @cthoyt
Part of @elixir_europe