Splice 0.5.16 Daml Model Upgrade

Summary

Canton Network announces Splice 0.5.16 introducing new Daml models that affect exchanges and apps. Exchanges and wallets parsing AmuletRules_Transfer must update parsing or move to CIP-0056; apps using splice-amulet older than 0.1.17 must recompile to >=0.1.17. Rollout dates: DevNet Apr 7 2026, TestNet Apr 21 2026, MainNet May 5 2026.

:Alert: Attention :Alert:

Splice 0.5.16, coming to DevNet on March 23rd, introduces new Daml models that will impact some exchanges and applications.

Action:
All exchanges and wallets that parse AmuletRules_Transfer transactions directly must either update their parsing methods to the new transfer workflows, or move to CIP-0056 token standard transfers.

All application developers who directly depend on splice-amulet models older than version 0.1.17 must recompile to a version greater than or equal to 0.1.17.

The Daml models requiring these changes will take effect on the following dates:

DevNet: Apr 7, 2026
TestNet: Apr 21, 2026
MainNet: May 5, 2026

Details in the Splice Release Notes: https://docs.dev.sync.global/release_notes.html#release-notes
Fully detailed example of the new transaction formats in this doc: https://docs.google.com/document/d/1kRxG8KQxY6bzzmJYm2PkRWaGCFWwVK7JXwomsz8pfaU/edit?tab=t.0

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splice daml models canton network amuletrules_transfer cip-0056 devnet testnet mainnet

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