[🧠 Smart Account] EIP-7702 upgrade/downgrade service by jungcome7 · Pull Request #1906 · chainapsis/keplr-wallet

jungcome7 · 2026-03-31T09:07:00Z

#1905에서 만든 Type 4 직렬화와 authorization 서명을 활용하여, Smart Account 업/다운그레이드를 실제 수행하는 서비스를 구현합니다. UI는 후속 PR에서 구현합니다.

변경사항

업/다운그레이드, 상태 조회, 수수료 조회를 위한 4개 메시지 추가 (approveExternal: false로 외부 dApp 호출 차단)
sendEip7702Tx 9단계 플로우 구현 (dummy auth → fillUnsignedEVMTx로 gas/fee/nonce batch 조회 → nonce+1로 진짜 auth 서명 → 브로드캐스트 → retry() 폴링)
외부 dApp이 authorizationList가 포함된 TX 서명을 요청하면 3개 지점에서 독립적으로 차단
- signEthereum에서 env.isInternalMsg를 확인하여 외부 메시지면 거부
- prepareAndSignTransaction에서 authorizationList가 있으면 무조건 거부
- 위 두 곳을 통과하더라도 validateAuthorizationList에서 허용된 delegator 주소인지, chainId=0이 아닌지 검증
가스 추정은 EIP-7702 전용 함수를 만들지 않고 기존 fillUnsignedEVMTx를 그대로 재사용
- eth_estimateGas 파라미터에 dummy authorizationList를 포함하면 RPC 노드가 authorization intrinsic gas(PER_EMPTY_ACCOUNT_COST = 25,000)를 자동으로 계산하므로, 수동 overhead 추가가 불필요
- 기존 파이프라인의 1.3x gas 버퍼, 20블록 feeHistory, mean/median priorityFee 분석이 그대로 적용되어 일반 TX와 동일한 수치로 추정

커밋

refactor: pass authorizationList to eth_estimateGas and use applyTxType in tx-executor
- 기존 가스 추정 파이프라인이 EIP-7702 authorizationList를 처리할 수 있도록 개선
- tx-executor의 트랜잭션 타입 감지를 applyTxType()으로 통합
feat: add smart account message classes and handler routing
- UI가 백그라운드에 업/다운그레이드를 요청할 수 있도록 4개의 메시지 클래스와 라우팅을 추가
feat: add EIP-7702 validation helpers and constants
- authorization의 delegator whitelist 및 chainId=0 검증 함수와 가스 추정용 dummy auth 생성 함수를 추가
feat: implement EIP-7702 smart account upgrade/downgrade service
- 검증부터 브로드캐스트, receipt 확인까지 전체 업/다운그레이드 플로우를 구현하고 외부 dApp 차단을 적용
test: add validateAuthorizationList tests
- authorization 검증 함수의 edge case(chainId=0, 미허용 주소, 대소문자 등)를 테스트

sendEip7702Tx 흐름

체인이 EIP-7702를 지원하는지, 하드웨어 지갑이 아닌지 검증
  │
  ▼
eth_getCode로 현재 delegation 상태 확인 (ready/supported/unsupported)
  │
  ▼
dummy auth로 fillUnsignedEVMTx 호출 → gas, fee, nonce를 batch RPC 1회로 조회
  │
  ▼
반환된 nonce+1로 진짜 authorization 서명 (self-sponsoring 규칙)
  │
  ▼
filled 결과에 진짜 authList를 덮어써서 Type 4 TX 조립
  │
  ▼
signEthereumPreAuthorized로 서명 (UI 확인은 메시지 전송 전에 완료)
  │
  ▼
RLP 직렬화 → eth_sendRawTransaction 브로드캐스트
  │
  ▼
retry()로 receipt 폴링, revert 감지 시 에러 throw

Test plan

UI PR 완성 후 Sepolia testnet에서 업그레이드/다운그레이드 E2E 검증

🤖 Generated with Claude Code

후속 PR — UI + ObservableQuery 마이그레이션

#1910에서 이 PR의 백엔드 서비스를 사용하는 UI 페이지를 구현합니다. 동시에 GetSmartAccountDelegationStatusMsg(메시지 기반 상태 조회)를 MobX ObservableQuery로 마이그레이션하여, 자동 캐시와 관찰 시 자동 fetch를 지원합니다. 이에 따라 해당 메시지/핸들러/init 등록은 #1910에서 삭제됩니다.

vercel · 2026-03-31T09:07:10Z

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keplr-wallet-extension	Ready	Preview, Comment	Apr 1, 2026 5:14am

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chatgpt-codex-connector · 2026-03-31T09:15:52Z

+        undefined,
+        chainId
+      );
+      return parseDelegation(code ?? "0x", ALLOWED_DELEGATORS);


Return unsupported status on chains without EIP-7702

getDelegationStatus always parses eth_getCode without checking the chain feature flag, so on non-7702 chains EOAs will be reported as "ready" (because code is 0x). That makes callers think upgrade is available, but upgradeToSmartAccount immediately fails later with "This chain does not support EIP-7702.", creating a broken flow for any UI that relies on this status endpoint. Add the same eip-7702 feature guard used in getAtomicCapability before returning delegation status.

Useful? React with 👍 / 👎.

반영했습니다. getAtomicCapability와 동일하게 getChainFeatures guard를 추가했습니다.

chatgpt-codex-connector · 2026-03-31T09:15:52Z

+      typeof auth.chainId === "string"
+        ? parseInt(auth.chainId, auth.chainId.startsWith("0x") ? 16 : 10)
+        : Number(auth.chainId);
+    if (numericChainId === 0 || !Number.isFinite(numericChainId)) {


Reject malformed authorization chain IDs

validateAuthorizationList uses parseInt and only rejects 0/non-finite values, so malformed values like "1abc" or negative IDs like "-1" pass validation. In internal signing flows this means invalid authorization entries are accepted and signed instead of being rejected at validation time, leading to hard-to-debug signing/broadcast failures and weakening the intended guardrail around authorization metadata. Enforce a strict positive-integer check (full-string validation) for chainId.

Useful? React with 👍 / 👎.

validateAuthorizationList에 도달하는 chainId는 항상 evmInfo.chainId(number, 양의 정수)에서 옵니다. string chainId가 들어오는 외부 dApp 경로는 signEthereum과 prepareAndSignTransaction에서 이미 차단되므로 현재로서는 발생하지 않습니다.

…pe in tx-executor Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…keplr-2044

jungcome7 · 2026-04-01T13:19:42Z

참고

#1910에서 이 PR의 GetSmartAccountDelegationStatusMsg를 MobX ObservableQuery로 마이그레이션했습니다.
delegation 상태가 여러 UI에서 반복 참조되어 쿼리 캐시 활용이 필요하므로, 해당 메시지/핸들러/init 등록/서비스 메서드를 삭제하고 ObservableQuery로 대체합니다.

piatoss3612

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jungcome7 requested a review from a team as a code owner March 31, 2026 09:07

vercel Bot deployed to Preview March 31, 2026 09:07 View deployment

jungcome7 changed the title ~~feat: EIP-7702 smart account upgrade/downgrade backend (KEPLR-2044)~~ [🧠 Smart Account] EIP-7702 upgrade/downgrade backend Mar 31, 2026

jungcome7 self-assigned this Mar 31, 2026

jungcome7 changed the title ~~[🧠 Smart Account] EIP-7702 upgrade/downgrade backend~~ [🧠 Smart Account] EIP-7702 upgrade/downgrade service Mar 31, 2026

chatgpt-codex-connector Bot reviewed Mar 31, 2026

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jungcome7 force-pushed the roy/keplr-2044 branch from 11371a7 to 266dc30 Compare March 31, 2026 09:36

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jungcome7 force-pushed the roy/keplr-2044 branch from 266dc30 to 0a9ca56 Compare March 31, 2026 09:41

vercel Bot deployed to Preview March 31, 2026 09:41 View deployment

jungcome7 and others added 5 commits March 31, 2026 19:00

refactor: pass authorizationList to eth_estimateGas and use applyTxTy…

acb5d5f

…pe in tx-executor Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: add smart account message classes and handler routing

0406f1c

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: add EIP-7702 validation helpers and constants

6c74327

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

feat: implement EIP-7702 smart account upgrade/downgrade service

e2e4d3e

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test: add validateAuthorizationList tests

fcd94ff

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

jungcome7 force-pushed the roy/keplr-2044 branch from 0a9ca56 to fcd94ff Compare March 31, 2026 10:01

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jungcome7 changed the base branch from roy/keplr-2043 to roy/evm-smart-account March 31, 2026 11:36

Merge remote-tracking branch 'origin/roy/evm-smart-account' into roy/…

d3209e5

…keplr-2044

vercel Bot deployed to Preview April 1, 2026 05:14 View deployment

jungcome7 mentioned this pull request Apr 1, 2026

[🧠 Smart Account] EIP-7702 network toggle & TX confirmation UI #1910

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piatoss3612 approved these changes Apr 2, 2026

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[🧠 Smart Account] EIP-7702 upgrade/downgrade service#1906

[🧠 Smart Account] EIP-7702 upgrade/downgrade service#1906
jungcome7 merged 6 commits intoroy/evm-smart-accountfrom
roy/keplr-2044

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변경사항

커밋

sendEip7702Tx 흐름

Test plan

후속 PR — UI + ObservableQuery 마이그레이션

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