ickb · phroi · Feb 26, 2026 · Feb 26, 2026 · Feb 26, 2026 · Feb 26, 2026
diff --git a/.changeset/adopt-ccc-udt.md b/.changeset/adopt-ccc-udt.md
@@ -0,0 +1,17 @@
+---
+"@ickb/core": major
+"@ickb/dao": minor
+"@ickb/order": major
+"@ickb/utils": major
+"@ickb/sdk": major
+---
+
+Adopt CCC udt.Udt as IckbUdt base class, replacing homegrown UDT infrastructure
+
+- Rewrite `IckbUdtManager` as `IckbUdt` extending CCC's `udt.Udt` base class
+- Accept code OutPoints instead of pre-built CellDep arrays
+- Override `infoFrom()` to value iCKB's three cell representations (xUDT, receipt, deposit)
+- Remove `udtHandler` parameter from `LogicManager` and `OwnedOwnerManager`
+- Replace `UdtHandler` with plain `udtScript` in `OrderManager`
+- Delete `UdtHandler`, `UdtManager`, `UdtCell`, `ErrorTransactionInsufficientCoin` from `@ickb/utils`
+- Widen `DaoManager.isDeposit()` to accept `CellAny`
diff --git a/.planning/PROJECT.md b/.planning/PROJECT.md
@@ -24,7 +24,7 @@ Clean, CCC-aligned library packages published to npm that frontends can depend o
 ### Active
 
 - [ ] Remove SmartTransaction — replace with `ccc.Transaction` + utility functions
-- [ ] Adopt CCC UDT handling — investigate subclassing `Udt` for iCKB's multi-representation value (xUDT + receipts + deposits)
+- [ ] Adopt CCC UDT handling — `IckbUdt extends udt.Udt` decided (Phase 3); managers get plain `ccc.Script` not `udt.Udt` instances (Phase 4); implementation in Phase 5
 - [ ] Systematic CCC alignment audit — replace local utilities with CCC equivalents from merged upstream PRs
 - [ ] Migrate bot app from Lumos to CCC + new packages
 - [ ] Migrate interface app from Lumos to CCC + new packages (straight swap, same UI)
@@ -73,10 +73,13 @@ Clean, CCC-aligned library packages published to npm that frontends can depend o
 | Decision | Rationale | Outcome |
 |----------|-----------|---------|
 | Remove SmartTransaction, use ccc.Transaction directly | SmartTransaction concept abandoned by ecosystem, no adoption from CCC maintainers | — Pending |
-| Investigate CCC Udt subclassing for iCKB | iCKB value is multi-representation (xUDT + receipts + deposits); need to determine if CCC's Udt can be extended | — Pending |
+| Subclass CCC Udt for iCKB | iCKB value is multi-representation (xUDT + receipts + deposits); Phase 3 confirmed `IckbUdt extends udt.Udt` with `infoFrom` override is feasible and chosen | Decided (Phase 3) |
+| IckbUdt uses individual code deps | CCC author dislikes dep groups for breaking semantics; IckbUdt overrides `addCellDeps` with xUDT + Logic code OutPoints; other managers keep dep groups for now | Decided (Phase 5 context) |
+| Drop compressState, accept CCC errors | `completeInputsByBalance` replaces `completeUdt`; CCC's `ErrorUdtInsufficientCoin` replaces custom error class; callers format messages | Decided (Phase 5 context) |
+| Managers get plain ccc.Script only | LogicManager/OwnedOwnerManager udtHandler removed (Phase 5), matching OrderManager pattern (Phase 4); udt.Udt instance lives at SDK level | Decided (Phase 5 context) |
 | Library refactor before app migration | Clean packages first, then migrate apps on stable foundation | — Pending |
 | Interface app: straight migration only | No UI/UX redesign — swap Lumos internals for CCC packages | — Pending |
 | Track CCC PR #328 (FeePayer) | Could become CCC-native solution for what SmartTransaction does for fee completion | — Pending |
 
 ---
-*Last updated: 2026-02-20 after initialization*
+*Last updated: 2026-02-26 after Phase 5 context (code deps for IckbUdt, manager udtHandler removal, compressState dropped, CCC error adoption)*
diff --git a/.planning/REQUIREMENTS.md b/.planning/REQUIREMENTS.md
@@ -15,10 +15,10 @@ Requirements for initial milestone. Each maps to roadmap phases.
 - [x] **SMTX-04**: `getHeader()` function and `HeaderKey` type are removed from `@ickb/utils`; all call sites inline CCC client calls (`client.getTransactionWithHeader()`, `client.getHeaderByNumber()`); header caching handled transparently by `ccc.Client.cache`
 - [x] **SMTX-05**: UDT handler registration (`addUdtHandlers()`) is replaced by direct `Udt` instance usage or standalone utility functions
 - [x] **SMTX-06**: 64-output NervosDAO limit check is consolidated into a single utility function (currently scattered across 6 locations)
-- [ ] **SMTX-07**: `IckbUdtManager` multi-representation UDT balance logic (xUDT + receipts + deposits) survives removal intact -- conservation law `Input UDT + Input Receipts = Output UDT + Input Deposits` is preserved
+- [x] **SMTX-07**: `IckbUdtManager` multi-representation UDT balance logic (xUDT + receipts + deposits) survives removal intact -- conservation law `Input UDT + Input Receipts = Output UDT + Input Deposits` preserved via accurate balance reporting in `IckbUdt.infoFrom` (on-chain script is authoritative enforcer)
 - [ ] **SMTX-08**: `IckbSdk.estimate()` and `IckbSdk.maturity()` continue working after SmartTransaction removal
 - [ ] **SMTX-09**: All 5 library packages (`@ickb/utils`, `@ickb/dao`, `@ickb/order`, `@ickb/core`, `@ickb/sdk`) compile and pass type checking after removal
-- [ ] **SMTX-10**: Deprecated CCC API calls (`udtBalanceFrom`, `getInputsUdtBalance`, `getOutputsUdtBalance`, `completeInputsByUdt`) are replaced with `@ckb-ccc/udt` equivalents
+- [x] **SMTX-10**: Deprecated CCC API calls (`udtBalanceFrom`, `getInputsUdtBalance`, `getOutputsUdtBalance`, `completeInputsByUdt`) are replaced with `@ckb-ccc/udt` equivalents
 
 ### CCC Utility Deduplication
 
@@ -33,8 +33,8 @@ Requirements for initial milestone. Each maps to roadmap phases.
 - [x] **UDT-01**: Feasibility assessment completed: can `IckbUdt extends udt.Udt` override `infoFrom()` or `getInputsInfo()`/`getOutputsInfo()` to account for receipt cells and deposit cells alongside xUDT cells
 - [x] **UDT-02**: Header access pattern for receipt value calculation is designed -- determine whether `client.getCellWithHeader()`, `client.getTransactionWithHeader()`, or direct CCC client calls are used within the Udt override (`getHeader()` utility removed in Phase 1)
 - [x] **UDT-03**: Decision documented: subclass CCC `Udt` vs. keep custom `UdtHandler` interface vs. hybrid approach
-- [ ] **UDT-04**: If subclassing is viable, `IckbUdt` class is implemented in `@ickb/core` with multi-representation balance calculation
-- [ ] **UDT-05**: If subclassing is not viable, `IckbUdtManager` is refactored to work with plain `ccc.Transaction` (no SmartTransaction dependency) while maintaining a compatible interface
+- [x] **UDT-04**: `IckbUdt extends udt.Udt` implemented in `@ickb/core` with `infoFrom` override for multi-representation balance; individual code deps via overridden `addCellDeps`; `typeScriptFrom` static method; LogicManager/OwnedOwnerManager `udtHandler` removed
+- [x] **UDT-05**: N/A -- Phase 3 confirmed subclassing IS viable (option a chosen)
 
 ## v2 Requirements
 
@@ -85,12 +85,12 @@ Which phases cover which requirements. Updated during roadmap creation.
 | SMTX-02 | Phase 1 | Complete | SmartTransaction class deleted from @ickb/utils (01-03) |
 | SMTX-03 | Phase 6 | Pending | |
 | SMTX-04 | Phase 1 | Complete | getHeader()/HeaderKey removed, CCC client calls inlined |
-| SMTX-05 | Phase 1, 4, 5 | Complete | addUdtHandlers() replaced with tx.addCellDeps(udtHandler.cellDeps) (01-03); UdtHandler/UdtManager replacement deferred to Phase 4-5 |
+| SMTX-05 | Phase 1, 4, 5 | In Progress | addUdtHandlers() replaced with tx.addCellDeps(udtHandler.cellDeps) (01-03); Phase 4: OrderManager.udtHandler→udtScript; Phase 5: LogicManager/OwnedOwnerManager.udtHandler removed + UdtHandler/UdtManager/ErrorTransactionInsufficientCoin/findUdts/UdtCell deleted from utils |
 | SMTX-06 | Phase 1 | Complete | DAO check contributed to CCC core via forks/ccc/ (01-01) |
-| SMTX-07 | Phase 5 | Pending | |
+| SMTX-07 | Phase 5 | Complete | |
 | SMTX-08 | Phase 6 | Pending | |
 | SMTX-09 | Phase 7 | Pending | |
-| SMTX-10 | Phase 4, 5 | Pending | Deprecated calls in dao/order (Phase 4) and core (Phase 5) |
+| SMTX-10 | Phase 5 | Complete | Deprecated ccc.udtBalanceFrom() calls are in utils (UdtManager) and core (IckbUdtManager), not dao/order. All replaced when UdtManager deleted and IckbUdt implemented in Phase 5 |
 | DEDUP-01 | Phase 2 | Complete | max()/min() replaced with Math.max()/Math.min() for number-typed contexts, local deleted (02-01) |
 | DEDUP-02 | Phase 2 | Complete | gcd() replaced with ccc.gcd(), local deleted (02-01) |
 | DEDUP-03 | Phase 2 | Complete | isHex() deleted, only used internally by deleted hexFrom() (02-01) |
@@ -99,8 +99,8 @@ Which phases cover which requirements. Updated during roadmap creation.
 | UDT-01 | Phase 3 | Complete | |
 | UDT-02 | Phase 3 | Complete | |
 | UDT-03 | Phase 3 | Complete | |
-| UDT-04 | Phase 5 | Pending | |
-| UDT-05 | Phase 5 | Pending | |
+| UDT-04 | Phase 5 | Complete | IckbUdt with infoFrom override, code deps, typeScriptFrom, manager cleanup |
+| UDT-05 | Phase 3 | N/A | Subclassing confirmed viable — option (a) chosen |
 
 **Coverage:**
 - v1 requirements: 20 total
@@ -109,4 +109,4 @@ Which phases cover which requirements. Updated during roadmap creation.
 
 ---
 *Requirements defined: 2026-02-21*
-*Last updated: 2026-02-24 after Phase 3 completion (UDT-01 through UDT-03 completed; Phase 3 complete)*
+*Last updated: 2026-02-26 after Phase 5 context (UDT-05 N/A — subclassing viable; SMTX-05 expanded with LogicManager/OwnedOwnerManager cleanup; UDT-04 detailed with code deps, typeScriptFrom, manager cleanup)*
diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
@@ -15,8 +15,8 @@ Decimal phases appear between their surrounding integers in numeric order.
 - [x] **Phase 1: SmartTransaction Removal (feature-slice)** - Delete SmartTransaction class and infrastructure across all packages; contribute 64-output DAO limit check to CCC core; migrate all method signatures to ccc.TransactionLike
 - [x] **Phase 2: CCC Utility Adoption** - Replace local utility functions that duplicate CCC equivalents across all packages; preserve iCKB-unique utilities
 - [x] **Phase 3: CCC Udt Integration Investigation** - Assess feasibility of subclassing CCC's Udt class for iCKB's multi-representation value; design header access pattern; document decision
-- [ ] **Phase 4: Deprecated CCC API Replacement** - Replace deprecated CCC API calls (`udtBalanceFrom`, etc.) with `@ckb-ccc/udt` equivalents in dao and order packages; finalize UDT handler replacement pattern based on Phase 3 findings
-- [ ] **Phase 5: @ickb/core UDT Refactor** - Implement IckbUdt class or refactor IckbUdtManager based on Phase 3 findings; preserve iCKB conservation law; replace deprecated CCC API calls in core
+- [x] **Phase 4: Deprecated CCC API Replacement** - Replace UdtHandler dependency in `@ickb/order` with plain `ccc.Script`; remove UDT cellDeps management from OrderManager; correct Phase 3 docs; verify `@ickb/dao` already clean
+- [ ] **Phase 5: @ickb/core UDT Refactor** - Implement `IckbUdt extends udt.Udt` with `infoFrom` override; remove `udtHandler` from LogicManager/OwnedOwnerManager; delete UdtHandler/UdtManager/ErrorTransactionInsufficientCoin/findUdts from utils; adopt individual code deps for IckbUdt; update SDK construction and error handling
 - [ ] **Phase 6: SDK Completion Pipeline** - Wire IckbSdk facade to CCC-native fee completion; verify estimate() and maturity() work end-to-end
 - [ ] **Phase 7: Full Stack Verification** - Verify all 5 library packages compile clean with no SmartTransaction remnants and no type errors
 
@@ -70,36 +70,39 @@ Plans:
 - [x] 03-02-PLAN.md — Write formal decision document (feasibility assessment, header access pattern, decision with rationale)
 
 ### Phase 4: Deprecated CCC API Replacement
-**Goal**: Deprecated CCC API calls are replaced with `@ckb-ccc/udt` equivalents in `@ickb/dao` and `@ickb/order`; UDT handler usage is finalized based on Phase 3 findings (method signatures and `addUdtHandlers()` removal already done in Phase 1)
-**Depends on**: Phase 1 (signatures migrated), Phase 3 (UDT decision — determines replacement pattern for UdtHandler usage)
-**Requirements**: SMTX-05, SMTX-10
+**Goal**: `UdtHandler` dependency in `@ickb/order` is replaced with plain `ccc.Script` (`udtScript`); UDT cellDeps management removed from OrderManager (caller/CCC Udt handles externally during balance completion); `@ickb/dao` verified clean (no UdtHandler, no deprecated APIs); Phase 3 decision doc corrected to match actual codebase state
+**Depends on**: Phase 1 (signatures migrated), Phase 3 (UDT decision)
+**Requirements**: SMTX-05
 **Success Criteria** (what must be TRUE):
-  1. No calls to deprecated CCC APIs (`udtBalanceFrom`, `getInputsUdtBalance`, `getOutputsUdtBalance`, `completeInputsByUdt`) exist in `@ickb/dao` or `@ickb/order`
-  2. UDT-related operations in `@ickb/dao` and `@ickb/order` use the pattern chosen in Phase 3 (direct `Udt` instance methods, refactored UdtManager, or hybrid)
-  3. Both `@ickb/dao` and `@ickb/order` compile successfully
-**Plans**: TBD
+  1. `OrderManager` constructor accepts `udtScript: ccc.Script` instead of `udtHandler: UdtHandler` -- all 9 `this.udtHandler.script` references replaced with `this.udtScript`
+  2. All `tx.addCellDeps(this.udtHandler.cellDeps)` calls removed from `mint()`, `addMatch()`, `melt()` -- UDT cellDeps are caller responsibility
+  3. `@ickb/order` no longer imports `UdtHandler` from `@ickb/utils`; no new `@ckb-ccc/udt` dependency added
+  4. `@ickb/dao` has no UdtHandler references and no deprecated CCC API calls (verified, no changes needed)
+  5. Phase 3 decision doc `03-DECISION.md` "Implementation Guidance for Phase 4" section corrected
+  6. `pnpm check:full` passes
+**Plans**: 1 plan
 
 Plans:
-- [ ] 04-01: TBD
-- [ ] 04-02: TBD
+- [x] 04-01-PLAN.md — Replace OrderManager udtHandler with udtScript: ccc.Script, remove UDT cellDeps, update SDK caller, verify dao and decision doc clean
 
 ### Phase 5: @ickb/core UDT Refactor
-**Goal**: IckbUdt class is implemented or IckbUdtManager is refactored based on Phase 3 findings; the iCKB conservation law is preserved through the refactor; deprecated CCC API calls are replaced in `@ickb/core`; UdtHandler/UdtManager are removed from `@ickb/utils` (manager method signatures already migrated to `ccc.TransactionLike` in Phase 1)
-**Depends on**: Phase 3 (UDT decision), Phase 4 (dao+order UDT pattern finalized)
-**Requirements**: SMTX-05, SMTX-07, SMTX-10, UDT-04, UDT-05
+**Goal**: `IckbUdt extends udt.Udt` implemented in `@ickb/core` with `infoFrom` override for multi-representation balance; iCKB conservation law preserved via accurate balance reporting; `udtHandler` removed from LogicManager/OwnedOwnerManager (Phase 4 pattern); `UdtHandler`, `UdtManager`, `ErrorTransactionInsufficientCoin`, `UdtCell`, `findUdts`, `addUdts` deleted from `@ickb/utils`; IckbUdt uses individual code deps (not dep group) with overridden `addCellDeps`; SDK updated to construct `IckbUdt` and handle CCC's `ErrorUdtInsufficientCoin`. See `05-CONTEXT.md` for full decisions.
+**Depends on**: Phase 3 (UDT decision), Phase 4 (order UDT pattern finalized)
+**Requirements**: SMTX-05, SMTX-07, SMTX-10, UDT-04
 **Success Criteria** (what must be TRUE):
-  1. The iCKB conservation law (`Input UDT + Input Receipts = Output UDT + Input Deposits`) is enforced correctly in the refactored code -- multi-representation UDT balance logic survives intact
-  2. If Phase 3 concluded subclassing is viable: `IckbUdt extends udt.Udt` exists in `@ickb/core` with overridden `infoFrom()` that accounts for xUDT cells, receipt cells, and deposit cells
-  3. If Phase 3 concluded subclassing is not viable: `IckbUdtManager` is refactored to work with plain `ccc.Transaction` while maintaining a compatible interface for balance calculation
-  4. `UdtHandler` interface and `UdtManager` class are removed from `@ickb/utils` (their responsibilities absorbed by the Phase 3 outcome implementation)
-  5. No calls to deprecated CCC APIs exist in `@ickb/core`
-  6. `@ickb/core` compiles successfully with no SmartTransaction imports
-**Plans**: TBD
+  1. `IckbUdt extends udt.Udt` exists in `@ickb/core` with overridden `infoFrom()` that accurately values xUDT cells (positive), receipt cells (positive, input only), and deposit cells (negative, input only) -- conservation law preserved via correct sign conventions
+  2. `IckbUdt.addCellDeps` overridden to add individual code deps (xUDT code OutPoint + iCKB Logic code OutPoint) instead of dep group
+  3. `IckbUdtManager.calculateScript` renamed to `IckbUdt.typeScriptFrom` (static, same params)
+  4. `LogicManager` and `OwnedOwnerManager` no longer take `udtHandler` parameter; `tx.addCellDeps(this.udtHandler.cellDeps)` calls removed (4 sites) -- UDT cellDeps are caller responsibility (Phase 4 pattern)
+  5. `UdtHandler` interface, `UdtManager` class, `ErrorTransactionInsufficientCoin` class, `UdtCell` interface, `findUdts`, `addUdts`, `isUdtSymbol` deleted from `@ickb/utils`
+  6. No calls to deprecated CCC APIs (`ccc.udtBalanceFrom`) exist in `@ickb/core` or `@ickb/utils`
+  7. SDK constructs `IckbUdt` instead of `IckbUdtManager`; passes `ickbUdt.script` to managers; handles `ErrorUdtInsufficientCoin` from CCC (not old `ErrorTransactionInsufficientCoin`)
+  8. `pnpm check:full` passes
+**Plans**: 2 plans
 
 Plans:
-- [ ] 05-01: TBD
-- [ ] 05-02: TBD
-- [ ] 05-03: TBD
+- [ ] 05-01-PLAN.md — Implement IckbUdt extends udt.Udt in core (infoFrom, addCellDeps, typeScriptFrom); remove udtHandler from LogicManager/OwnedOwnerManager; add @ckb-ccc/udt dependency
+- [ ] 05-02-PLAN.md — Delete UDT infrastructure from utils (UdtHandler, UdtManager, ErrorTransactionInsufficientCoin, UdtCell, findUdts, addUdts); update SDK to construct IckbUdt with code OutPoints; verify pnpm check:full
 
 ### Phase 6: SDK Completion Pipeline
 **Goal**: IckbSdk facade uses CCC-native fee completion pipeline; estimate() and maturity() continue working after SmartTransaction removal
@@ -140,7 +143,7 @@ Phases execute in numeric order: 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7
 | 1. SmartTransaction Removal (feature-slice) | 3/3 | Complete    | 2026-02-22 |
 | 2. CCC Utility Adoption | 1/1 | Complete    | 2026-02-23 |
 | 3. CCC Udt Integration Investigation | 2/2 | Complete    | 2026-02-24 |
-| 4. Deprecated CCC API Replacement | 0/2 | Not started | - |
-| 5. @ickb/core UDT Refactor | 0/3 | Not started | - |
+| 4. Deprecated CCC API Replacement | 1/1 | Complete    | 2026-02-26 |
+| 5. @ickb/core UDT Refactor | 0/2 | Not started | - |
 | 6. SDK Completion Pipeline | 0/2 | Not started | - |
 | 7. Full Stack Verification | 0/1 | Not started | - |