docs: specify symmetric deposit bounceback mechanism#360
Open
docs: specify symmetric deposit bounceback mechanism#360
Conversation
Recreates #329 which was closed due to force push on main. Rebased on current main branch. Co-Authored-By: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5473-3933-756c-8b65-60dfe41cb262
…call sites Updates the Rust ABI binding and all callers to include the new bouncebackRecipient parameter added by the bounceback spec. Co-Authored-By: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5473-3933-756c-8b65-60dfe41cb262
- Format .deposit() calls to multi-line across 5 files (cargo fmt) - Pass ZONE_OUTBOX_ADDRESS as 4th arg to ZoneInbox constructor in generate_zone_genesis.rs (was missing after Solidity constructor update) - Regenerate zone-test-genesis.json with updated ZoneInbox bytecode Co-authored-by: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
Co-Authored-By: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
Reverts unrelated changes that were bundled with the deposit bounceback PR: - Restore zone_id=0 unscoped token support in auth validation - Restore 30-day (2592000s) max validity window (was changed to 30min) - Restore enforce_transfer rejecting on policy resolution failure - Restore enforce_mint doc comment about L1 enforcement deferral - Restore MockPolicyProvider::failing() test helper - Restore policy cache seeding in start_local_zone_with_fixture Co-authored-by: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
The zonePortal field in the auth token wire format is unrelated to the deposit bounceback feature. Reverts token format back to the original 29-byte layout (version + zoneId + chainId + issuedAt + expiresAt). Co-authored-by: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
…zonePortal) Reverts rpc.md to main — the zonePortal field, removal of unscoped tokens section, and 30-minute validity window were not part of the deposit bounceback feature. Co-Authored-By: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
Co-Authored-By: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
Co-Authored-By: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
- Remove .amp/tools (benchmarking toolbox wrappers) - Remove .mergify.yml (CI config) - Remove tempo.nu (benchmarking script) - Revert Justfile portal-in-token auth changes - Revert rpc/Cargo.toml tempo-compat feature (not needed) - Restore ztip20.rs policy resolution error tests Co-authored-by: dankrad <[email protected]> Amp-Thread-ID: https://ampcode.com/threads/T-019d5f52-e187-7554-b95f-59c7b789eb28
mattsse
reviewed
Apr 7, 2026
Contributor
mattsse
left a comment
mattsse
left a comment
There was a problem hiding this comment.
now require an L1 address (bouncebackRecipient) that receives refunded tokens if zone-side processing fails
there's a potential issue when the bouncebackRecipient is no longer able to receive the tokens when the bounceback is attempted to be processed on L1 (transfer fails due to 403)
Resolve conflicts: - docs/pages/protocol/privacy/overview.md: accept deletion (docs site removed on main in #366) - IZone.sol and Rust crates auto-merged; bounceback spec additions coexist with main's updates. Made-with: Cursor
Resolve conflicts introduced by PR #355 (deposit counter) landing on main: Code conflicts: - crates/primitives/src/abi.rs: DepositMade keeps both bouncebackRecipient (bounceback branch) and depositNumber (main). - docs/specs/src/zone/IZone.sol: same — event signature carries both fields. - docs/specs/src/zone/ZonePortal.sol: * DepositMade emit site now passes bouncebackRecipient and thisDeposit. * WithdrawalBounceBack emit site uses the renamed event (from BounceBack) and includes thisDeposit as the new trailing depositNumber field. - docs/specs/test/zone/ZonePortal.t.sol: DepositMade expectation now includes both bouncebackRecipient (address(0)) and depositNumber (1). Regenerated crates/tempo-zone/tests/assets/zone-test-genesis.json via `tempo-xtask generate-zone-genesis` since both branches updated ZoneInbox bytecode (bounceback adds bouncebackRecipient handling; deposit counter adds lastProcessedDepositNumber). Spec: - docs/specs/zone_spec.md condensed IZonePortal stub: update DepositMade, EncryptedDepositMade, BatchSubmitted, WithdrawalBounceBack events to include depositNumber; add DepositBounceBack event; update deposit() and depositEncrypted() signatures to include bouncebackRecipient; add depositCount() and lastProcessedDepositNumber() view functions. Made-with: Cursor
The integration tests' start_from_l1() patches the ZoneInbox/ZoneConfig bytecode at test setup time by replacing Address::ZERO with the real L1 portal address (see crates/tempo-zone/tests/it/utils.rs — expects 4 occurrences in ZoneInbox and 1 in ZoneConfig). The previous regeneration baked 0xbb..bb as the placeholder, causing `expected 4 tempoPortal immutable(s) ... found 0` assertion failures in all start_from_l1 integration tests (demo_cross_zone, demo_shield_and_send, etc.). Regenerated with --tempo-portal 0x0000...0000 to match main's convention. Made-with: Cursor
Previous regeneration used stale solidity artifacts that produced a ZoneInbox missing the advanceTempo selector (d01e8d31). This caused the system tx to revert at 188 gas (no matching dispatcher branch). The new genesis deploys ZoneInbox at 8091 bytes with all 7 expected function selectors including d01e8d31 advanceTempo. Made-with: Cursor
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Recreates PR #329 which was closed due to a force push on main. Rebased the diff on the current main branch.
Specifies a symmetric bounce-back mechanism for deposits, closing the gap where failed deposits had no recovery path. Addresses #167.
Key design decisions:
bouncebackRecipienton deposits: Bothdeposit()anddepositEncrypted()now require an L1 address (bouncebackRecipient) that receives refunded tokens if zone-side processing fails.ZoneInbox.advanceTempo()fails to mint, the zone creates a zero-fee, zero-callbackPendingWithdrawaltargetingbouncebackRecipient.bouncebackRecipient = address(0). Bounce-back withdrawals havefallbackRecipient = address(0).Closes #167
Co-Authored-By: dankrad [email protected]
Prompted by: dankrad