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 > A user who makes a post can restrict who is allowed to reply to it 
 > Private communications (direct messages) are currently handled by a centralized service 
 > most of Bluesky’s indexing infrastructure is operated by Bluesky Social PBC 
 > Relay performs some initial data cleaning (discarding malformed updates, filtering out illegal content and high-volume spam 
 > A DID of this form can be resolved to the corresponding DID document by querying a server at https://plc.directory/, which is currently operated by Bluesky Social PBC 
 > Bluesky PDSes therefore hold these signing keys custodially on behalf of users