Splice 0.4.19

• Sequencer
  • Fix a regression introduced in 0.4.18 that made topology transactions significantly more expensive to process.
• Docker images
  • All app & UI images now use a non-root user.
• Validator

  • Add a trigger to export these party metrics:

    • validator_synchronizer_topology_num_parties: Counts the number of parties allocated on the Global Synchronizer
    • validator_synchronizer_topology_num_parties_per_participant: Uses the label participant_id and counts the number of parties hosted on the Global Synchronizer per participant. Note that multi-hosted parties are counted for each participant they are hosted on.

    The trigger does not run by default. See enable_extra_metric_triggers for instructions on how to enable it.

• SV
  • Deployment
    • Remove CPU limits from the helm charts for scan, mediator and sequencer apps. This should avoid issues with cpu scheduling that might lead to performance degradations.
  • UI
    • When updating the AmuletRules config, the UI will omit any transfer fee steps with value zero from the AmuletRules config stored on-ledger. Thereby making the AmuletRules contract smaller and saving traffic for transactions using it. This is motivated by CIP-0078 CC Fee Removal .
• Canton and SDK:

  • Introduction of 2 new alpha primitives in DA.Crypto.Text Module in SDK version 3.3.0-snapshot.20250930.0. Note: To make use of the functionality added here, you must compile against SDK version 3.3.0-snapshot.20250930.0 and newer and you must first upgrade Canton to the version in Splice 0.4.19 before you can upload those dars to your validator.
    • sha256 : BytesHex -> BytesHex: Computes the SHA-256 hash of the given hexadecimal bytes.
    • secp256k1WithEcdsaOnly : SignatureHex -> BytesHex -> PublicKeyHex -> Bool: Verifies an ECDSA signature on the secp256k1 curve, checking if the signature matches the message and public key.