# What Happens to a Contract's State Variables during a Mutable Upgrade? ⎊ Path

**Published:** 2025-12-04
**Author:** Greeks.live
**Categories:** Path

---

## What Happens to a Contract’s State Variables during a Mutable Upgrade?

During a mutable upgrade using a proxy pattern, the contract's state variables (data) are preserved in the proxy contract's storage. The new logic contract only dictates how that existing data is read and modified.

It is crucial that the storage layout of the new logic contract is identical to or compatible with the old one to prevent data corruption, a risk known as storage collision.

- [How Is the Upgrade Function Typically Triggered in a UUPS Contract?](https://learn.greeks.live/path/how-is-the-upgrade-function-typically-triggered-in-a-uups-contract/)

- [Explain the Concept of “Rug Pull” in Relation to Mutable Contract Ownership](https://learn.greeks.live/path/explain-the-concept-of-rug-pull-in-relation-to-mutable-contract-ownership/)

- [What Is a ‘Proxy Contract’ and Why Is It a Security Concern?](https://learn.greeks.live/path/what-is-a-proxy-contract-and-why-is-it-a-security-concern/)

- [What Is a “Governance Attack” on a Mutable Contract?](https://learn.greeks.live/path/what-is-a-governance-attack-on-a-mutable-contract/)

- [Does the Proxy Pattern Affect the Cost of Contract Deployment?](https://learn.greeks.live/path/does-the-proxy-pattern-affect-the-cost-of-contract-deployment/)

- [What Is the Difference between a State Change and a Code Change in a Deployed Smart Contract?](https://learn.greeks.live/path/what-is-the-difference-between-a-state-change-and-a-code-change-in-a-deployed-smart-contract/)

- [What Is the Role of a Proxy Contract in Maintaining Upgradability?](https://learn.greeks.live/path/what-is-the-role-of-a-proxy-contract-in-maintaining-upgradability/)

- [What Is the Security Vulnerability Known as “Storage Collision” in Proxy Patterns?](https://learn.greeks.live/path/what-is-the-security-vulnerability-known-as-storage-collision-in-proxy-patterns/)

## Glossar

### [State Variable](https://learn.greeks.live/area/state-variable/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Data ⎊ A state variable represents data permanently stored on the blockchain within a smart contract's storage.

### [Contract Upgrade](https://learn.greeks.live/area/contract-upgrade/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Modification ⎊ A contract upgrade refers to the technical procedure of altering the logic or parameters of a deployed smart contract, which is essential for the iterative development of crypto derivative platforms.

### [Upgrade](https://learn.greeks.live/area/upgrade/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Iteration ⎊ An upgrade, within cryptocurrency, options trading, and financial derivatives, signifies a protocol or system evolution, often implemented through hard forks or soft forks in blockchain technology, impacting consensus mechanisms and smart contract functionality.

### [Logic Contract](https://learn.greeks.live/area/logic-contract/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Framework ⎊ A Logic Contract, within the context of cryptocurrency derivatives and financial engineering, represents a formalized agreement encoding conditional execution logic directly onto a blockchain or distributed ledger.

### [State Variables](https://learn.greeks.live/area/state-variables/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)

Mechanism ⎊ State variables, within cryptocurrency and financial derivatives, represent the core inputs defining a system’s present condition, crucial for modeling price dynamics and risk assessment.

## Discover More

### [What Role Do Financial Derivatives Play in Amplifying the Impact of State-Sponsored Market Manipulation?](https://learn.greeks.live/path/what-role-do-financial-derivatives-play-in-amplifying-the-impact-of-state-sponsored-market-manipulation/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Role Do Financial Derivatives Play in Amplifying the Impact of State-Sponsored Market Manipulation?](https://learn.greeks.live/wp-content/uploads/2025/10/Decentralized-Finance-Protocol-Architecture-Intersecting-Multi-Asset-Volatility-Surface-Structuring.webp)

Derivatives magnify the impact of state-sponsored manipulation, creating systemic risk in financial markets.

### [What Happens If a Trader's Equity Falls below the Initial Margin but Remains above the Maintenance Margin?](https://learn.greeks.live/path/what-happens-if-a-traders-equity-falls-below-the-initial-margin-but-remains-above-the-maintenance-margin/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens If a Trader's Equity Falls below the Initial Margin but Remains above the Maintenance Margin?](https://learn.greeks.live/wp-content/uploads/2025/10/Sleek-Ovoid-Blockchain-Governance-Module-Reflection-Demonstrating-Impermanent-Loss-Mitigation-Strategies.webp)

The position remains open, but the trader is restricted from new trades or withdrawals until equity is restored to the initial margin.

### [What Happens to the Remaining Allowance If a Contract Only Uses a Portion of It?](https://learn.greeks.live/path/what-happens-to-the-remaining-allowance-if-a-contract-only-uses-a-portion-of-it/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens to the Remaining Allowance If a Contract Only Uses a Portion of It?](https://learn.greeks.live/wp-content/uploads/2025/10/Perfectly-Balanced-Leveraged-Token-Positioning-Demonstrating-Delta-Hedging-Equilibrium-In-Illiquid-Crypto-Markets.webp)

The unused portion of the allowance remains active for the contract to use in the future.

### [What Happens If the Interactions Step Fails?](https://learn.greeks.live/path/what-happens-if-the-interactions-step-fails/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens If the Interactions Step Fails?](https://learn.greeks.live/wp-content/uploads/2025/10/Aerodynamic-Digital-Asset-Futures-Contract-Execution-Through-Quantum-Resistant-Cryptographic-Hashing-Apparatus.webp)

The transaction usually reverts, but if the return value of the external call is not checked, the contract state can become inconsistent.

### [What Happens If a Selected PoS Validator Fails to Sign the Block in Time?](https://learn.greeks.live/path/what-happens-if-a-selected-pos-validator-fails-to-sign-the-block-in-time/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens If a Selected PoS Validator Fails to Sign the Block in Time?](https://learn.greeks.live/wp-content/uploads/2025/10/Digital-Asset-Tokenization-Reflecting-On-Chain-Settlement-Mechanics-Versus-Over-The-Counter-Derivatives.webp)

The network selects the next validator, and the non-signing validator may face a penalty like a temporary stake lock-up.

### [What Happens If a Transaction Runs out of Gas during Execution?](https://learn.greeks.live/path/what-happens-if-a-transaction-runs-out-of-gas-during-execution/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens If a Transaction Runs out of Gas during Execution?](https://learn.greeks.live/wp-content/uploads/2025/10/Microcosmic-Analysis-Of-Encapsulated-Digital-Asset-Futures-Settlement-Mechanism-Dynamics.webp)

Execution stops, all state changes are reverted, but the sender still pays the fee for the gas that was consumed up to the failure point.

### [What Is the Concept of a "State Change" in a Smart Contract?](https://learn.greeks.live/path/what-is-the-concept-of-a-state-change-in-a-smart-contract/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Is the Concept of a "State Change" in a Smart Contract?](https://learn.greeks.live/wp-content/uploads/2025/10/Decentralized-Finance-Mechanism-Layering-Representing-Complex-Structured-Product-Execution-Through-Atomic-Swaps.webp)

A state change is a permanent alteration of a smart contract's stored data on the blockchain following a successful transaction execution.

### [What Happens If a Miner Submits a Share That Meets the Network Difficulty but Not the Pool's Target Difficulty?](https://learn.greeks.live/path/what-happens-if-a-miner-submits-a-share-that-meets-the-network-difficulty-but-not-the-pools-target-difficulty/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens If a Miner Submits a Share That Meets the Network Difficulty but Not the Pool's Target Difficulty?](https://learn.greeks.live/wp-content/uploads/2025/10/Decentralized-Autonomous-Organization-Governance-Framework-Interaction-with-Exotic-Options-Payoff-Structures.webp)

The share would be rejected as it fails to meet the pool's minimum target difficulty, which is always lower than the network's.

### [What Happens If a Clearinghouse Faces a Major Default by a Member Firm?](https://learn.greeks.live/path/what-happens-if-a-clearinghouse-faces-a-major-default-by-a-member-firm/?utm_source=crypto.greeks.live&utm_medium=referral&utm_campaign=satellite)
![What Happens If a Clearinghouse Faces a Major Default by a Member Firm?](https://learn.greeks.live/wp-content/uploads/2025/10/Sleek-Dark-Blue-and-Ivory-Flying-Saucer-Obscured-Mechanism-Representing-Decentralized-Finance-Protocol-Architecture.webp)

It uses the defaulting member's margin, its own capital, and then the mutualized default fund to cover losses.

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**Original URL:** https://learn.greeks.live/learn/what-happens-to-a-contracts-state-variables-during-a-mutable-upgrade/
