[fernandomg]

Summary

No related issue.

Canton 3.6 disables the top-level filter and verbose on active-contracts reads, deprecated since 3.4, so on a 3.6 participant every registry answer is a 500. Found bumping canton-dappbooster to Canton 3.6, which needs a v0.3.1 tag with this to repin.

Changes

• the registry and seed.mjs send both inside eventFormat.

Test plan

Automated tests

1. In registry/, run npm run lint, npm run typecheck:test and npm test;
2. Expect all to pass; against the old ledger.ts, the two updated tests fail.

Manual verification

1. canton-dappbooster's token example, run against this registry on Canton 3.6, passed its 29-step walk.

Breaking changes

None.

Checklist

• Self-reviewed my own diff
• Tests added or updated
• Docs updated (if applicable)
• No unrelated changes bundled in

Screenshots

None.

[Copilot]

Note

Copilot was unable to complete this review at the selected tier due to model policy or plan restrictions.

🟢 Approval recommended

The update cleanly migrates active-contracts request fields into the new eventFormat structure across client code, seeding script, and unit tests to maintain Canton 3.6 compatibility, with only a minor suggested assertion improvement noted.

No open issues 🎉

What changed in this PR

This pull request updates Ledger API /v2/state/active-contracts reads to remain compatible with Canton 3.6 by moving deprecated top-level request fields (filter, verbose) under eventFormat, preventing 500 responses on newer participants.

Changes:

• Move filtersByParty and verbose into eventFormat for active-contracts requests in the registry client.
• Apply the same eventFormat request shape in scripts/seed.mjs.
• Update unit tests to reflect the new request body structure (no top-level filter / verbose).

Review note (nit): One test asserts that filter/verbose are no longer top-level, but does not explicitly assert that verbose is included under eventFormat, which would better prevent regressions.

File	Summary
scripts/​seed.mjs	Updates active-contracts requests to send query fields under eventFormat for Canton 3.6 compatibility.
registry/​test/​ledger.test.ts	Updates assertions to validate the new request shape (no top-level filter/verbose) and eventFormat usage.
registry/​src/​ledger.ts	Adjusts active-contracts request construction in HttpLedgerClient to use eventFormat (including filters/verbosity) instead of deprecated top-level fields.

_{Review effort: Balanced}

[lmcorbalan]

LGTM