Release of Canton 3.5.16

Canton 3.5.16 has been released on September 03, 2026.

Summary

This is a maintenance release that brings few minor improvements and bug fixes.

Added additional validation of the request timestamp in confirmation response processing.

Peer-to-peer networking does not support gRPC load balancing nor health-checking because the ordering protocol itself provides resilience, however they were mistakenly enabled and caused confusing log messages.
In some cases the P2P network status console function was reporting outgoing connections as incoming connections.
When performing catch-up download multiple epoch’s at the same time.
Minor improvements to the segment flush internal logic
Only fetch topology state for events that may alter sequencer-relevant state

ACS commitment processor reinitialization will now use a smaller memory footprint due to a leaner loading of contract-ids.
Extended Ledger JSON API spec (openapi.yaml) with documentation for the user-paid traffic enforcement endpoints (/traffic/accounts)

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 14.24 (Debian 14.24-1.pgdg13+2), PostgreSQL 15.19 (Debian 15.19-1.pgdg13+2), PostgreSQL 16.15 (Debian 16.15-1.pgdg13+2), PostgreSQL 18.6 (Debian 18.6-1.pgdg13+2)