As an app provider, Is there a way to know which validators have uploaded a specific dar on the Canton Network

Questions
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1

As an App Provider Is there a way to programmatically confirm which validators have uploaded a specific dar?

This is useful especially when upgrading the application to ensure all clients are on a supported version of a dar.

2

Yes. The Admin API provides access to the topology state of the Network. The following commands within the canton console return a list of all participants that have vetted a certain package:

@ val packageID = <my package ID>
packageID: String = <my package ID>

@ val packageVettedParticipantIds = participants.remote.flatMap { participant => val vettedPackages = 
        participant.topology.vetted_packages.list()
        vettedPackages.filter(res => res.item.packages.exists(_.packageId == packageID))
          .map(res => res.item.participantId)
        } 
packageVettedParticipantIds: Seq[ParticipantId] = List(
  PAR::validator1::122021...,
  PAR::validator2::1220ca...,
)
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