Release of Canton 3.5.4

Canton 3.5.4 has been released on June 10, 2026.

Summary

This is a maintenance release that fixes a bug around modify synchronizers and brings a few improvements.

Config flag canton.participants.participant.parameter.alpha-multi-synchronizer-support was renamed to enable-all-ledger-api-reassignments.
Participant topology feature flag EnableAlphaMultiSynchronizer was renamed to EnableMultiSynchronizer.
Improved coordination between the ACS commitment processor and its store, preventing benign DB_STORAGE_DEGRADATION warnings during participant shutdown.

Message ListRegisteredSynchronizersRequest accepts a new all_statuses attribute to allow to retrieve all
registered synchronizers (and not only the active ones).
Added new console command participant1.synchronizers.list_all_registered to list all registered synchronizers.

Database tables partitioning was introduced to the database tables of the BFT Orderer
These changes bring significant improvements to the performance of the pruning operation as well as many other queries that got optimized
IMPORTANT: these changes require running a new automatic database migration that can potentially take considerable amount of time, depending on how much data is in the affected tables at the time of the migration

Fixed an issue that was making ModifySynchronizer request to fail if the physical synchronizer id was set.

The following Canton protocol versions are supported:

Dependency	Version
Canton protocol versions	34, 35

Canton has been tested against the following versions of its dependencies:

Dependency	Version
Java Runtime	OpenJDK 64-Bit Server VM (build 21.0.12+2-nixos, mixed mode, sharing)
Postgres	Recommended: PostgreSQL 17.10 (Debian 17.10-1.pgdg13+1) – Also tested: PostgreSQL 14.23 (Debian 14.23-1.pgdg13+1), PostgreSQL 15.18 (Debian 15.18-1.pgdg13+1), PostgreSQL 16.14 (Debian 16.14-1.pgdg13+1)

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