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12193 | Re-Enable Legacy Contract Query Execution

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Proposal: Fix legacy contracts by core upgrade

This proposal seeks approval to re-introduce support for legacy CosmWasm contract execution. The patch restores functionality broken during the v2.1.0 upgrade in 2022.

Proposal: Re-Enable Legacy Contract Execution

Summary

This proposal seeks approval for a patch to the chain core that will re-introduce support for legacy CosmWasm contract execution. The change consists of a small fix (~30โ€“50 lines of code) that restores functionality broken during the v2.1.0 upgrade in 2022.

Affected contracts include not only a number of Astroport pools and potentially some remaining Terraswap pools. While re-enabling these contracts would make currently locked liquidity accessible again without requiring contract migration, the fix would also allow a lot more legacy contracts that include tax handling on chain to work again.

Context

During the v2.1.0 upgrade, custom Terra query support was changed, which caused contracts to stop working, which query the tax rate on chain or exchange rates from the oracle module. This affected several liquidity pools holding significant amounts of LUNC and USTC (besides other tokens).

Key findings from a node-level patch test:

  • The patch allows transactions against these contracts to succeed again.
  • Pools currently contain large amounts of locked liquidity.
  • Example balances (rounded):
    • LUNC/USTC pool: ~700M LUNC, ~6M USTC
    • bLUNA/LUNC pool: ~150M LUNC
    • MIR/USTC pool: ~6M USTC
    • ASTRO/USTC pool: ~3.9M USTC
    • kUST/USTC pool: ~2.9M USTC
  • Across 465 identified Astroport contracts:
    • ~27.4M USTC
    • ~959M LUNC

These tokens are currently unreachable due to the broken execution path. That means, traders can not use those pools at all (native โ†” native) or only in one direction (cw20 โ† native).

Implications

Re-enabling execution is expected to instantly โ€œre-openโ€ these pools. This has two sides:

  • Positive:ย The chain and its users regain access to their liquidity. Tokens that should be in circulation become usable again. Further, there will be a lot more contracts that will start working again without the need of contract migration.
  • Negative:ย The affected pools are highly imbalanced. Immediately after activation, users and most likely arbitrage bots will drain the obvious opportunities. Example: the LUNC/USTC pool trades at roughly 2ร— the fair market ratio. This means large swings will happen within minutes of the fix going live. This could affect the price of LUNC and USTC both positive or negative on other DEXes/CEXes, too, in the short term.

Risks

  • Arbitrage drain:ย First movers (mostly bots) will capture outsized profits, not long-term holders.
  • Public perception:ย Can be framed as โ€œunlockingโ€ large amounts of USTC/LUNC supply, which may be viewed negatively, although these coins where always meant to be unlocked. The โ€œlockingโ€ happened due to a core upgrade side-effect.
  • Timing:ย Liquidity providers in affected and currently disfunctional pools cannot โ€œexit earlyโ€ before the patch is applied.
  • Precedent:ย Some may argue this sets a precedent for L1 patches to support dApps. However, the breakage was originally caused by an L1 upgrade, and the fix is small and contained.

Conclusion

The patch restores functionality that was unintentionally broken. It unlocks liquidity for affected users and contracts, and will restore contract functionality for legacy contracts on chain.

Voting Options:

  • YESย โ€“ Approve the patch to re-enable legacy contract execution.
  • NOย โ€“ Do not apply the patch, legacy contracts remain unusable.
  • NO WITH VETOย โ€“ Strong opposition.
  • ABSTAINย โ€“ No opinion.

Further information (not part of the proposal text)

The code changes have been done and can be seen here: fix: Legacy contracts using terra query variants by StrathCole ยท Pull Request #602 ยท classic-terra/core ยท GitHub

Additional test information:
I created a local test script which contains the original wasm (contract) code of four astroport contracts. The steps the test script does:

  1. Start a local chain with only one node using v1.1.0 of the chain
  2. deploy all four astroport pair contracts, instantiate them and test providing liquidity, swapping and withdrawing liquidity.
  3. go throughย allย upgrades of the chain (i.e. v2.0.1, v2.1.1, v2.2.1, โ€ฆ, v3.5.1) and re-test liquidity and swap operations
  4. as expected from v2.1 on the liquidity providing still works, but swaps (native tokens) and withdrawal results in
Error: rpc error: code = Unknown desc = rpc error: code = Unknown desc = failed to execute message; message index: 0: Generic error: Querier system error: Unsupported query type: unknown terra query variant: execute wasm contract failed [classic-terra/[email protected]/x/wasm/keeper/keeper.go:396] With gas wanted: '18446744073709551615' and gas used: '187740' : unknown request
  1. upgrade to the local patched version and then re-run the tests. This confirmed that the swaps and withdrawals worked again afterwards:
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  • Kourschak
    Posted 29 September 2025 at 19h43

    Liquidity that can be use to the lunc ecosystem

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12193 | Re-Enable Legacy Contract Query Execution

16 min read 3,143 words 237 views

Quelle von:

Vorschlag: Alte Vertrรคge durch Kern-Upgrade reparieren

Mit diesem Vorschlag wird die Wiedereinfรผhrung der Unterstรผtzung fรผr die alte CosmWasm-Vertragsausfรผhrung beantragt. Der Patch stellt die Funktionalitรคt wieder her, die wรคhrend des Upgrades von v2.1.0 im Jahr 2022 unterbrochen wurde.

Vorschlag: Legacy-Vertragsdurchfรผhrung wieder aktivieren

Zusammenfassung

Mit diesem Antrag wird die Genehmigung eines Patches fรผr den Kettenkern beantragt, der die Unterstรผtzung fรผr die alte CosmWasm-Vertragsausfรผhrung wieder einfรผhrt. Die ร„nderung besteht aus einer kleinen Korrektur (~30-50 Zeilen Code), die die Funktionalitรคt wiederherstellt, die wรคhrend des Upgrades von v2.1.0 im Jahr 2022 verloren ging.

Zu den betroffenen Vertrรคgen gehรถren nicht nur eine Reihe von Astroport-Pools und mรถglicherweise einige verbleibende Terraswap-Pools. Wรคhrend die Wiederaktivierung dieser Vertrรคge die derzeit gesperrte Liquiditรคt wieder zugรคnglich machen wรผrde, ohne dass eine Vertragsmigration erforderlich wรคre, wรผrde die Korrektur auch dazu fรผhren, dass viel mehr รคltere Vertrรคge, die eine Steuerbehandlung in der Kette beinhalten, wieder funktionieren.

Kontext

Wรคhrend des Upgrades auf v2.1.0 wurde die Unterstรผtzung fรผr benutzerdefinierte Terra-Abfragen geรคndert, was dazu fรผhrte, dass Vertrรคge nicht mehr funktionierten, die den Steuersatz auf Ketten oder Wechselkurse vom Orakelmodul abfragen. Dies betraf mehrere Liquiditรคtspools, die erhebliche Mengen an LUNC und USTC (neben anderen Token) halten.

Die wichtigsten Erkenntnisse aus einem Patch-Test auf Knotenebene:

  • Mit dem Patch kรถnnen Transaktionen gegen diese Vertrรคge wieder erfolgreich durchgefรผhrt werden.
  • Die Pools enthalten derzeit groรŸe Mengen an gesperrter Liquiditรคt.
  • Beispielsalden (gerundet):
    • LUNC/USTC-Pool: ~700M LUNC, ~6M UTC
    • bLUNA/LUNC-Pool: ~150M LUNC
    • MIR/USTC-Pool: ~6M USTC
    • ASTRO/USTC-Pool: ~3.9M USTC
    • kUST/USTC-Pool: ~2.9M USTC
  • Fรผr 465 identifizierte Astroport-Vertrรคge:
    • ~27.4M USTC
    • ~959M LUNC

Diese Token sind derzeit aufgrund des unterbrochenen Ausfรผhrungspfads nicht erreichbar. Das bedeutet, dass Hรคndler diese Pools entweder gar nicht (nativ โ†” nativ) oder nur in einer Richtung (cw20 โ† nativ) nutzen kรถnnen.

Auswirkungen

Wenn Sie die Ausfรผhrung wieder aktivieren, wird erwartet, dass diese Pools sofort wieder “geรถffnet” werden. Dies hat zwei Seiten:

  • Positiv: Die Kette und ihre Nutzer erhalten wieder Zugang zu ihrer Liquiditรคt. Token, die im Umlauf sein sollten, werden wieder nutzbar. AuรŸerdem gibt es viel mehr Vertrรคge, die wieder funktionieren, ohne dass eine Vertragsmigration erforderlich ist.
  • Negativ: Die betroffenen Pools sind sehr unausgewogen. Unmittelbar nach der Aktivierung werden Benutzer und hรถchstwahrscheinlich auch Arbitrage-Bots die offensichtlichen Mรถglichkeiten ausschรถpfen. Beispiel: Der LUNC/USTC-Pool wird zu einem Verhรคltnis gehandelt, das ungefรคhr dem 2fachen des fairen Marktes entspricht. Das bedeutet, dass es innerhalb von Minuten nach der Aktivierung des Fixings zu groรŸen Schwankungen kommen wird. Dies kรถnnte den Preis von LUNC und USTC auch auf anderen DEXen/CEXen kurzfristig sowohl positiv als auch negativ beeinflussen.

Risiken

  • Arbitrage-Abfluss: Wer zuerst zuschlรคgt (meist Bots), wird รผberproportionale Gewinne einstreichen, nicht aber langfristige Inhaber.
  • ร–ffentliche Wahrnehmung: Kann als “Freischaltung” groรŸer Mengen an USTC/LUNC-Angeboten interpretiert werden, was negativ gesehen werden kann, obwohl diese Mรผnzen immer freigeschaltet werden sollten. Die “Sperrung” erfolgte aufgrund eines Nebeneffekts eines Kern-Upgrades.
  • Zeitplan: Liquiditรคtsanbieter in betroffenen und derzeit nicht funktionierenden Pools kรถnnen nicht “vorzeitig aussteigen”, bevor der Patch angewendet wird.
  • Prรคzedenzfall: Einige mรถgen argumentieren, dass dies einen Prรคzedenzfall fรผr L1-Patches zur Unterstรผtzung von dApps darstellt. Allerdings wurde die Stรถrung ursprรผnglich durch ein L1-Upgrade verursacht, und die Korrektur ist klein und รผberschaubar.

Fazit

Der Patch stellt die Funktionalitรคt wieder her, die versehentlich unterbrochen wurde. Er schaltet die Liquiditรคt fรผr betroffene Benutzer und Vertrรคge frei und stellt die Vertragsfunktionalitรคt fรผr รคltere Vertrรคge in der Kette wieder her.

Abstimmungsmรถglichkeiten:

  • JA – Genehmigen Sie den Patch, um die Ausfรผhrung von Legacy-Vertrรคgen wieder zu aktivieren.
  • NEIN – Wenden Sie den Patch nicht an, Legacy-Vertrรคge bleiben unbrauchbar.
  • NEIN MIT VETO – Starke Opposition.
  • ABSTAIN – Keine Stellungnahme.

Weitere Informationen (nicht Teil des Vorschlagstextes)

Die Code-ร„nderungen wurden vorgenommen und kรถnnen hier eingesehen werden: fix: Legacy-Vertrรคge mit Terra-Abfragevarianten von StrathCole – Pull Request #602 – classic-terra/core – GitHub

Zusรคtzliche Informationen zum Test:
Ich habe ein lokales Testskript erstellt, das den originalen Wasm (Vertrag) Code von vier Astroport-Vertrรคgen enthรคlt. Die Schritte, die das Testskript ausfรผhrt:

  1. Starten Sie eine lokale Kette mit nur einem Knoten unter Verwendung von v1.1.0 der Kette
  2. alle vier Astroport-Paar-Kontrakte einsetzen, sie instanziieren und die Bereitstellung von Liquiditรคt, den Tausch und den Abzug von Liquiditรคt testen.
  3. alle Upgrades der Kette durchlaufen (d.h. v2.0.1, v2.1.1, v2.2.1, …, v3.5.1) und die Liquiditรคts- und Swap-Operationen erneut testen
  4. wie von v2.1 erwartet, funktioniert die Bereitstellung von Liquiditรคt immer noch, aber Swaps (native Token) und Abhebungen fรผhren zu
Error: rpc error: code = Unknown desc = rpc error: code = Unknown desc = failed to execute message; message index: 0: Generic error: Querier system error: Unsupported query type: unknown terra query variant: execute wasm contract failed [classic-terra/[email protected]/x/wasm/keeper/keeper.go:396] With gas wanted: '18446744073709551615' and gas used: '187740' : unknown request
  1. aktualisieren Sie auf die lokale gepatchte Version und fรผhren Sie die Tests dann erneut durch. Dies bestรคtigte, dass die Swaps und Abhebungen danach wieder funktionierten:
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ull},"signatures":["7zIHxYrrtVlqWAf5UzLQzrRY8XaAn4PO+BMI3bBzK+Z5pU42P/vZvlZV6+KJMefpzPF7GU7OLR9w69HSgg0VAA=="]},"timestamp":"2025-09-11T14:29:18Z","events":[{"type":"coin_spent","attributes":[{"key":"spender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"amount","value":"11955270uluna","index":true}]},{"type":"coin_received","attributes":[{"key":"receiver","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"amount","value":"11955270uluna","index":true}]},{"type":"transfer","attributes":[{"key":"recipient","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"sender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"amount","value":"11955270uluna","index":true}]},{"type":"message","attributes":[{"key":"sender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true}]},{"type":"tx","attributes":[{"key":"fee","value":"11955270uluna","index":true},{"key":"fee_payer","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true}]},{"type":"tx","attributes":[{"key":"acc_seq","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v/140","index":true}]},{"type":"tx","attributes":[{"key":"signature","value":"7zIHxYrrtVlqWAf5UzLQzrRY8XaAn4PO+BMI3bBzK+Z5pU42P/vZvlZV6+KJMefpzPF7GU7OLR9w69HSgg0VAA==","index":true}]},{"type":"message","attributes":[{"key":"action","value":"/cosmwasm.wasm.v1.MsgExecuteContract","index":true},{"key":"sender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"module","value":"wasm","index":true}]},{"type":"coin_spent","attributes":[{"key":"spender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"amount","value":"50000uusd","index":true}]},{"type":"coin_received","attributes":[{"key":"receiver","value":"terra16t7y0vrtpqjw2d7jvc2209yan9002339vjr96d","index":true},{"key":"amount","value":"50000uusd","index":true}]},{"type":"transfer","attributes":[{"key":"recipient","value":"terra16t7y0vrtpqjw2d7jvc2209yan9002339vjr96d","index":true},{"key":"sender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"amount","value":"50000uusd","index":true}]},{"type":"execute","attributes":[{"key":"_contract_address","value":"terra16t7y0vrtpqjw2d7jvc2209yan9002339vjr96d","index":true}]},{"type":"wasm","attributes":[{"key":"_contract_address","value":"terra16t7y0vrtpqjw2d7jvc2209yan9002339vjr96d","index":true},{"key":"action","value":"swap","index":true},{"key":"sender","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"receiver","value":"terra1ynfwy6ct69n6hw7mafdxjflz7w0wak0jrj3y6v","index":true},{"key":"offer_asset","value":"uusd","index":true},{"key":"ask_asset","value":"uluna","index":true},{"key":"offer_amount","value":"50000","index":true},{"key":"return_amount","value":"136507","index":true},{"key":"tax_amount","value":"0","index":true},{"key":"spread_amount","value":"0","index":true},{"key":"commission_amount","value":"410","index":true},{"key":"maker_fee_amount","value":"0","index":true}]},{"type":"coin_spent","attributes":[{"key":"spender","value":"terra16t7y0vrtpqjw2d7jvc2209yan9002339vjr96d","index":true},{"key":"amount","value":"682uluna","index":true}]},{"type":"coin_received","attributes":[{"key":"receiver","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"amount","value":"682uluna","index":true}]},{"type":"transfer","attributes":[{"key":"recipient","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"sender","value":"terra16t7y0vrtpqjw2d7jvc2209yan9002339vjr96d","index":true},{"key":"amount","value":"682uluna","index":true}]},{"type":"coin_spent","attributes":[{"key":"spender","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"amount","value":"1uluna","index":true}]},{"type":"coin_received","attributes":[{"key":"receiver","value":"terra1jv65s3grqf6v6jl3dp4t6c9t9rk99cd8pm7utl","index":true},{"key":"amount","value":"1uluna","index":true}]},{"type":"transfer","attributes":[{"key":"recipient","value":"terra1jv65s3grqf6v6jl3dp4t6c9t9rk99cd8pm7utl","index":true},{"key":"sender","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"amount","value":"1uluna","index":true}]},{"type":"coin_spent","attributes":[{"key":"spender","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"amount","value":"67uluna","index":true}]},{"type":"coin_received","attributes":[{"key":"receiver","value":"terra1jgp27m8fykex4e4jtt0l7ze8q528ux2lh4zh0f","index":true},{"key":"amount","value":"67uluna","index":true}]},{"type":"transfer","attributes":[{"key":"recipient","value":"terra1jgp27m8fykex4e4jtt0l7ze8q528ux2lh4zh0f","index":true},{"key":"sender","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true},{"key":"amount","value":"67uluna","index":true}]},{"type":"coin_spent","attributes":[{"key":"spender","value":"terra17xpfvakm2amg962yls6f84z3kell8c5lkaeqfa","index":true}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