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fix(wallet): patch reown solana adapter to use Ledger - #8442
Solana orders can now be placed with a Ledger connected over WalletConnect. Non-sponsored orders sign correctly, the app no longer crashes on a Solana-only WalletConnect session, and sponsored orders fall back to self-paid on Ledger Live rather than failing at the device.
1. Non-sponsored signing — new patches/@reown__appkit-adapter-solana@1.8.19.patch, registered in pnpm-workspace.yaml. In SolanaWalletConnectProvider.signTransaction the response branches are reordered: a returned transaction now wins over signature, and a response carrying neither throws explicitly instead of reading result.transaction as undefined.
2. Crash on a Solana-only WalletConnect session — cowSdk.ts no longer builds the ViemAdapter unless walletClient.account exists, and patches/@reown__appkit-adapter-wagmi@1.8.19.patch additionally requires accountData.address before calling handleAccountChanged.
3. Sponsored orders on Ledger Live — new useSolanaWalletName (libs/wallet, a thin wrapper over AppKit's namespace-aware useWalletInfo('solana')) and useWalletAcceptsForeignFeePayer (modules/trade). Both useIsSolanaSponsoredTrade and useSolanaFlowOptions consume the predicate, so the cost shown to the user and the path the flow actually takes cannot disagree.
Why
Non-sponsored. Ledger Wallet refreshes the recentBlockhashafter the user approves on the device (LedgerHQ/ledger-live#23295) and signs the updated message, returning both a signature and the full signed transaction. The adapter checked 'signature' in result first, attached that signature to our original transaction — still carrying the stale blockhash — and discarded the authoritative one. Transaction.serialize() defaults to verifySignatures: true, so it threw Signature verification failed. Backport of reown-com/appkit#5818, still open upstream.
The crash. A WalletConnect session approved for the solana namespace only leaves wagmi at status: 'connected' with zero eip155 accounts, so useWalletClient() resolves a viem client with no .account. ViemSignerAdapter's constructor throws Signer is missing account inside CowSdkUpdater's effect and reaches the ErrorBoundary, and reown's wagmi adapter separately calls handleAccountChanged({ address: undefined }), whose toChecksummedAddress lowercases unguarded. Pre-existing on develop; this branch just surfaced it first.
Sponsored. Ledger Live's WalletConnect handler rejects a transaction whose fee payer is not the connected account (Sender does not match transaction fee payer) before it ever reaches the device. The decisive evidence is in the FE-930 thread: the same Ledger account signs the same sponsored transaction fine once imported into Phantom, so neither the device nor the protocol objects — it is Ledger Live's own pre-flight check, and Ledger documents no such restriction on solana_signTransaction. Nothing that keeps feePayer = sponsor will get through it, so there is no transaction-shaping workaround; the only thing left is to not sponsor. Detection matches the WalletConnect session peer name, which means a Ledger used through Phantom keeps sponsorship.
Risks
Ledger Live users now need SOL for Solana swaps, and nothing tells them why sponsorship was withdrawn — the existing balance validation states the requirement but not the reason. Worth a follow-up with proper copy.
Detection is a substring match on ledger against the session peer name, following the existing peerName.includes('safe') pattern rather than an exact-name set. A rename upstream would silently re-enable sponsorship for a wallet that cannot use it.
The predicate returns true while the wallet name is unknown, so sponsorship stays on for every wallet but the known-bad ones rather than flickering self-paid for everyone during connect. AppKit's useWalletInfo seeds from getWalletInfo() instead of only subscribing, which closes the page-reload case where a restored session would otherwise never report a name.
The 20s signing window (MAX_WINDOW_MS in estimateSolanaSigningDeadline) is untouched here and remains a separate concern for a slow device review. Raised by @Anxo in the FE-930 thread; Elena did not hit it in testing.
Patching vendored dist output — an established pattern at this version, but the Solana adapter patch has to be dropped once reown#5818 ships.
Merged develop into this branch.develop had independently landed two things this branch's wagmi patch also carried (the accountData.connector?.id optional chain and the balance.formatted fallback), so that patch was rebuilt on top of develop's version; its net addition here is the single accountData.address guard.
Verification
The merged wagmi patch was validated rather than assumed: reverse-applying it recovers the pristine blob 79697e34… the patch declares as its pre-image, and applying develop's patch and this one to that same pristine file differ by exactly the new address guard — every develop reconnection fix survives byte-for-byte.
Reproduced the original signing error locally by swapping only the blockhash on a transaction and re-attaching a signature made over the modified message, which confirms the mechanism rather than inferring it.
Confirmed the patches are live in the installed packages (both resolve to their _patch_hash= directories).
No hardware verification. Closing FE-930 needs a real Ledger over WalletConnect, which I could not run.
✅ AI Review (Claude Opus 5): self-review, no blocking findings
This is a self-review of my own change, so it is weaker evidence than an independent one — it should not substitute for a reviewer on the wallet-signing path. CI on this head was still running when the review was written, so it is not cited.
Finding: [NITPICK] lastValidBlockHeight can understate the signed blockhash's validity window
The height comes from our own getLatestBlockhash(), but after the adapter patch the wallet may have signed a fresher blockhash, so the recorded height can be lower than the real one.
Traced the consumer before classifying: modules/onchainTransactions/updaters/FinalizeTxUpdater/services/checkSolanaTransaction.ts:193 does not declare failure when the height is exceeded — it falls through to the transaction-history lookup. The cost is an earlier, more expensive lookup, not a mis-marked transaction.
Left unfixed deliberately: correcting it means re-reading the blockhash off the returned transaction plus an extra RPC round-trip, widening a diff whose point is the root cause. Noted in Risks instead.
Watch item, not a finding: the stale-signer path is unchanged on purpose. With walletClient present but accountless the effect returns early, so appSignerAccountAtom keeps the previous EVM account rather than being cleared. That is safe for useAppSignerForAccount, which compares addresses, but useAppSigner() — used by useOffChainCancelOrder and useCancelMultipleOrders — still hands out the stale signer. That gap pre-dates this branch and clearing the atoms would change behaviour beyond the fix, so it is left alone.
Tests.useWalletAcceptsForeignFeePayer and useSolanaFlowOptions are covered, and useIsSolanaSponsoredTrade — which had no test at all — now has one, specifically so the two sponsorship gates cannot drift apart. No test for the adapter patches: the defect is in vendored dist output and our call sites were already correct, so a test would exercise a mocked provider rather than the patch.
Review scope and related context
Checked and clear:
Does the reorder regress non-Ledger wallets? No. Per the WalletConnect Solana spec signature is required and transaction optional, so a wallet returning only a signature takes the second branch unchanged; one returning both did not modify the message, making the paths equivalent.
Is the address guard redundant after develop? No. develop's new if (!connection?.accounts?.length) guards syncConnection, which calls toChecksummedAddress directly. The reported crash came through handleAccountChanged — the account-watcher path, where address can be undefined while connector is set.
Both sponsorship gates.isSponsored reaches the flow via useSolanaFlowOptions while the UI and required-SOL maths use useIsSolanaSponsoredTrade; gating only one would quote a sponsored price and then make the user pay. Both consume the predicate and both assert it in tests.
Reachability of similar unguarded dereferences.useApproveCallback looked like the same walletClient.account.address crash but already guards earlier in the callback; useContract.ts:244 already uses ?.. Neither is a real hit.
AppKit subscription semantics.subscribeChainProp fires only on change, so a plain subscription would miss a session restored before mount. AppKit's own useWalletInfo seeds from getWalletInfo() first, which is why it is used instead of hand-rolling one.
Verification run this session (not re-run for the review): cowswap-frontend test — 3307 passed, the single failure being a test that fetches live claim data and passes outside the sandbox; cowswap-frontend lint and typecheck; wallet lint and test (151 passed). Diff checked against AGENTS.md non-negotiables: no any, no non-null assertions, no new catch blocks, no dependency changes beyond the patch registration.
Needs a physical Ledger with the Solana app, and Ledger Live updated to a build carrying the post-review blockhash refresh.
Connect a Ledger through WalletConnect on Solana.
Make sure that the app does not crash into a "Something went wrong" screen while connecting, and that the wallet shows as connected.
Place a non-sponsored Solana swap and approve it on the device.
Make sure that the order is submitted and no Signature verification failed / Invalid signature for public key error appears.
Place a Solana swap that would normally be sponsored (same wallet, sponsorship flag on).
Make sure that no Sender does not match transaction fee payer error appears and the order goes through as a self-paid one.
Make sure that the SOL cost shown before signing matches what is actually deducted — the quoted cost and the executed path are driven by two separate hooks, and this step is what catches them disagreeing.
Import the same Ledger into Phantom and place a sponsored Solana swap.
Make sure that it is still sponsored — the gate keys off the WalletConnect peer, so Ledger-through-Phantom must be unaffected.
Place a sponsored Solana swap with Phantom alone (no Ledger) to confirm nothing changed for ordinary wallets.
Repeat step 1 in widget / dapp mode — this is connector and session code, and that surface forces different reconnect behaviour.
The changes update EVM wallet account handling and adapter behavior. They add a Solana wallet-name hook and use wallet fee-payer support to determine sponsored trade eligibility and flow options. They also update Solana transaction signing and register the patched adapter.
CowSdkUpdater now requires a wallet account before setting up the adapter. The Wagmi patch updates account checks, connection restoration, and balance formatting. The signer documentation describes EVM account availability and Solana-only connections.
signTransaction uses a returned serialized transaction when available. If the wallet returns only a signature, the adapter attaches it to the transaction. If neither response field is present, the adapter throws an invalid-response error. The workspace maps the patched dependency.
The wallet library exports a hook that returns the connected Solana wallet name. The trade hook rejects names containing ledger and accepts unknown names or names without that substring. Tests cover these cases.
Sponsored trade eligibility and Solana flow options now require the wallet to accept a foreign fee payer. Tests cover eligibility conditions and updates after the wallet capability changes.
cowprotocol/cowswap#8449: Updates Solana sponsorship eligibility for smart-contract wallet owners in the same sponsorship hook.
cowprotocol/cowswap#8452: Uses sponsorship status to calculate and display Solana transaction costs.
Suggested reviewers: danziger, azebuado
Merge Risk: Low · previous review 10941
A Solana-only connection may retain an earlier EVM signer, affecting order cancellation. This bounded risk warrants owner awareness before merge.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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The title identifies the Reown Solana adapter patch and its Ledger support objective.
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The description covers the changes, issue, test steps, risks, and self-checks. It also states that hardware and preview testing remain incomplete.
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A rabbit checks the wallet name, Then weighs the fee-payer claim. A signed transaction finds its way, While account checks guide the day. The sponsorship path now knows Which wallet can accept those flows.
limitofzero
changed the title
fix(wallet): patch reown solana adapter to use the wallet-returned transaction
fix(wallet): patch reown solana adapter to use the ledger
Oct 21, 2026
limitofzero
changed the title
fix(wallet): patch reown solana adapter to use the ledger
fix(wallet): patch reown solana adapter to use Ledger
Oct 21, 2026
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Review comments at @patches/@reown__appkit-adapter-wagmi@1.8.19.patch:
- Around line 16-17: Update the connected-state handling around
accountData.status and the account-change guard so that when accountData.address
is absent but prevAccountData.address existed, it emits disconnect before the
existing account-update logic. Preserve the current behavior for connected
accounts with an address and for other connection states.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @apps/cowswap-frontend/src/cowSdk.ts:
- Line 72: Update the walletClient.account guard so an absent EVM account clears
the retained signer and signer account before returning, preventing a stale
signer from being used by EVM flows.
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Summary
Solana orders can now be placed with a Ledger connected over WalletConnect. Non-sponsored orders sign correctly, the app no longer crashes on a Solana-only WalletConnect session, and sponsored orders fall back to self-paid on Ledger Live rather than failing at the device.
Fixes FE-930
Details
What changed
1. Non-sponsored signing — new
patches/@reown__appkit-adapter-solana@1.8.19.patch, registered inpnpm-workspace.yaml. InSolanaWalletConnectProvider.signTransactionthe response branches are reordered: a returnedtransactionnow wins oversignature, and a response carrying neither throws explicitly instead of readingresult.transactionasundefined.2. Crash on a Solana-only WalletConnect session —
cowSdk.tsno longer builds theViemAdapterunlesswalletClient.accountexists, andpatches/@reown__appkit-adapter-wagmi@1.8.19.patchadditionally requiresaccountData.addressbefore callinghandleAccountChanged.3. Sponsored orders on Ledger Live — new
useSolanaWalletName(libs/wallet, a thin wrapper over AppKit's namespace-awareuseWalletInfo('solana')) anduseWalletAcceptsForeignFeePayer(modules/trade). BothuseIsSolanaSponsoredTradeanduseSolanaFlowOptionsconsume the predicate, so the cost shown to the user and the path the flow actually takes cannot disagree.Why
Non-sponsored. Ledger Wallet refreshes the
recentBlockhashafter the user approves on the device (LedgerHQ/ledger-live#23295) and signs the updated message, returning both asignatureand the full signedtransaction. The adapter checked'signature' in resultfirst, attached that signature to our original transaction — still carrying the stale blockhash — and discarded the authoritative one.Transaction.serialize()defaults toverifySignatures: true, so it threwSignature verification failed. Backport of reown-com/appkit#5818, still open upstream.The crash. A WalletConnect session approved for the
solananamespace only leaves wagmi atstatus: 'connected'with zero eip155 accounts, souseWalletClient()resolves a viem client with no.account.ViemSignerAdapter's constructor throwsSigner is missing accountinsideCowSdkUpdater's effect and reaches the ErrorBoundary, and reown's wagmi adapter separately callshandleAccountChanged({ address: undefined }), whosetoChecksummedAddresslowercases unguarded. Pre-existing ondevelop; this branch just surfaced it first.Sponsored. Ledger Live's WalletConnect handler rejects a transaction whose fee payer is not the connected account (
Sender does not match transaction fee payer) before it ever reaches the device. The decisive evidence is in the FE-930 thread: the same Ledger account signs the same sponsored transaction fine once imported into Phantom, so neither the device nor the protocol objects — it is Ledger Live's own pre-flight check, and Ledger documents no such restriction onsolana_signTransaction. Nothing that keepsfeePayer = sponsorwill get through it, so there is no transaction-shaping workaround; the only thing left is to not sponsor. Detection matches the WalletConnect session peer name, which means a Ledger used through Phantom keeps sponsorship.Risks
ledgeragainst the session peer name, following the existingpeerName.includes('safe')pattern rather than an exact-name set. A rename upstream would silently re-enable sponsorship for a wallet that cannot use it.truewhile the wallet name is unknown, so sponsorship stays on for every wallet but the known-bad ones rather than flickering self-paid for everyone during connect. AppKit'suseWalletInfoseeds fromgetWalletInfo()instead of only subscribing, which closes the page-reload case where a restored session would otherwise never report a name.MAX_WINDOW_MSinestimateSolanaSigningDeadline) is untouched here and remains a separate concern for a slow device review. Raised by @Anxo in the FE-930 thread; Elena did not hit it in testing.distoutput — an established pattern at this version, but the Solana adapter patch has to be dropped once reown#5818 ships.developinto this branch.develophad independently landed two things this branch's wagmi patch also carried (theaccountData.connector?.idoptional chain and thebalance.formattedfallback), so that patch was rebuilt on top ofdevelop's version; its net addition here is the singleaccountData.addressguard.Verification
79697e34…the patch declares as its pre-image, and applyingdevelop's patch and this one to that same pristine file differ by exactly the new address guard — everydevelopreconnection fix survives byte-for-byte._patch_hash=directories).✅ AI Review (Claude Opus 5): self-review, no blocking findings
This is a self-review of my own change, so it is weaker evidence than an independent one — it should not substitute for a reviewer on the wallet-signing path. CI on this head was still running when the review was written, so it is not cited.
Finding: [NITPICK]
lastValidBlockHeightcan understate the signed blockhash's validity windowapps/cowswap-frontend/src/modules/trade/services/solanaSend/sendSolanaTransaction.ts:35getLatestBlockhash(), but after the adapter patch the wallet may have signed a fresher blockhash, so the recorded height can be lower than the real one.modules/onchainTransactions/updaters/FinalizeTxUpdater/services/checkSolanaTransaction.ts:193does not declare failure when the height is exceeded — it falls through to the transaction-history lookup. The cost is an earlier, more expensive lookup, not a mis-marked transaction.Risksinstead.Watch item, not a finding: the stale-signer path is unchanged on purpose. With
walletClientpresent but accountless the effect returns early, soappSignerAccountAtomkeeps the previous EVM account rather than being cleared. That is safe foruseAppSignerForAccount, which compares addresses, butuseAppSigner()— used byuseOffChainCancelOrderanduseCancelMultipleOrders— still hands out the stale signer. That gap pre-dates this branch and clearing the atoms would change behaviour beyond the fix, so it is left alone.Tests.
useWalletAcceptsForeignFeePayeranduseSolanaFlowOptionsare covered, anduseIsSolanaSponsoredTrade— which had no test at all — now has one, specifically so the two sponsorship gates cannot drift apart. No test for the adapter patches: the defect is in vendoreddistoutput and our call sites were already correct, so a test would exercise a mocked provider rather than the patch.Review scope and related context
Checked and clear:
signatureis required andtransactionoptional, so a wallet returning only a signature takes the second branch unchanged; one returning both did not modify the message, making the paths equivalent.develop? No.develop's newif (!connection?.accounts?.length)guardssyncConnection, which callstoChecksummedAddressdirectly. The reported crash came throughhandleAccountChanged— the account-watcher path, whereaddresscan be undefined whileconnectoris set.isSponsoredreaches the flow viauseSolanaFlowOptionswhile the UI and required-SOL maths useuseIsSolanaSponsoredTrade; gating only one would quote a sponsored price and then make the user pay. Both consume the predicate and both assert it in tests.useApproveCallbacklooked like the samewalletClient.account.addresscrash but already guards earlier in the callback;useContract.ts:244already uses?.. Neither is a real hit.subscribeChainPropfires only on change, so a plain subscription would miss a session restored before mount. AppKit's ownuseWalletInfoseeds fromgetWalletInfo()first, which is why it is used instead of hand-rolling one.Verification run this session (not re-run for the review):
cowswap-frontendtest — 3307 passed, the single failure being a test that fetches live claim data and passes outside the sandbox;cowswap-frontendlint and typecheck;walletlint and test (151 passed). Diff checked againstAGENTS.mdnon-negotiables: noany, no non-null assertions, no new catch blocks, no dependency changes beyond the patch registration.Generated using the
pr-reviewskill from the CoW Protocol skills repo.To test
Needs a physical Ledger with the Solana app, and Ledger Live updated to a build carrying the post-review blockhash refresh.
Signature verification failed/Invalid signature for public keyerror appears.Sender does not match transaction fee payererror appears and the order goes through as a self-paid one.Preview URLs
Self-checks
Summary by CodeRabbit
Summary by CodeRabbit