# Reorg Attack ⎊ Definition

**Published:** 2026-04-01
**Author:** Greeks.live
**Categories:** Definition

---

## Reorg Attack

A reorg attack, or chain reorganization, occurs when an attacker with significant hashing power creates a longer chain of blocks than the honest network, causing the network to switch to the attacker's chain. This allows the attacker to revert confirmed transactions and potentially double spend assets.

By effectively rewriting history, the attacker invalidates transactions that the recipient believed were final. This is a primary risk in proof-of-work networks with low total hash rate.

The defense against such attacks is to wait for a sufficient number of confirmations, making it exponentially more expensive for an attacker to rewrite the history. It highlights the importance of chain depth in determining the security of a transaction.

Reorgs are a major concern for exchanges and platforms that rely on fast settlement.

- [Transaction Reversion Analysis](https://term.greeks.live/definition/transaction-reversion-analysis/)

- [Rounding Bias](https://term.greeks.live/definition/rounding-bias/)

- [Valuation Oracles](https://term.greeks.live/definition/valuation-oracles/)

- [Permanent Establishment in DeFi](https://term.greeks.live/definition/permanent-establishment-in-defi/)

- [Revenue-to-Burn Ratios](https://term.greeks.live/definition/revenue-to-burn-ratios/)

- [Immutability Tradeoffs](https://term.greeks.live/definition/immutability-tradeoffs/)

- [Strategic Asset Liquidation](https://term.greeks.live/definition/strategic-asset-liquidation/)

- [Borrowing Cost Projections](https://term.greeks.live/definition/borrowing-cost-projections/)

## Discover More

### [Settlement Layer Performance](https://term.greeks.live/term/settlement-layer-performance/)
![A highly complex visual abstraction of a decentralized finance protocol stack. The concentric multilayered curves represent distinct risk tranches in a structured product or different collateralization layers within a decentralized lending platform. The intricate design symbolizes the composability of smart contracts, where each component like a liquidity pool, oracle, or governance layer interacts to create complex derivatives or yield strategies. The internal mechanisms illustrate the automated execution logic inherent in the protocol architecture.](https://term.greeks.live/wp-content/uploads/2025/12/decentralized-finance-layered-architecture-representing-risk-management-collateralization-structures-and-protocol-composability.webp)

Meaning ⎊ Settlement layer performance determines the speed and reliability of trade finalization, acting as the foundation for efficient decentralized derivatives.

### [Market Volatility Risk](https://term.greeks.live/definition/market-volatility-risk/)
![A multi-colored spiral structure illustrates the complex dynamics within decentralized finance. The coiling formation represents the layers of financial derivatives, where volatility compression and liquidity provision interact. The tightening center visualizes the point of maximum risk exposure, such as a margin spiral or potential cascading liquidations. This abstract representation captures the intricate smart contract logic governing market dynamics, including perpetual futures and options settlement processes, highlighting the critical role of risk management in high-leverage trading environments.](https://term.greeks.live/wp-content/uploads/2025/12/dynamic-volatility-compression-and-complex-settlement-mechanisms-in-decentralized-derivatives-markets.webp)

Meaning ⎊ The risk of significant price declines during the time required to achieve favorable tax treatment.

### [Protocol Inflation](https://term.greeks.live/definition/protocol-inflation/)
![A detailed 3D rendering illustrates the precise alignment and potential connection between two mechanical components, a powerful metaphor for a cross-chain interoperability protocol architecture in decentralized finance. The exposed internal mechanism represents the automated market maker's core logic, where green gears symbolize the risk parameters and liquidation engine that govern collateralization ratios. This structure ensures protocol solvency and seamless transaction execution for complex synthetic assets and perpetual swaps. The intricate design highlights the complexity inherent in managing liquidity provision across different blockchain networks for derivatives trading.](https://term.greeks.live/wp-content/uploads/2025/12/interoperability-protocol-architecture-examining-liquidity-provision-and-risk-management-in-automated-market-maker-mechanisms.webp)

Meaning ⎊ The increase in total token supply through reward issuance, creating potential sell pressure and dilution for holders.

### [Non Custodial Wallet Risks](https://term.greeks.live/term/non-custodial-wallet-risks/)
![A cutaway view of a precision-engineered mechanism illustrates an algorithmic volatility dampener critical to market stability. The central threaded rod represents the core logic of a smart contract controlling dynamic parameter adjustment for collateralization ratios or delta hedging strategies in options trading. The bright green component symbolizes a risk mitigation layer within a decentralized finance protocol, absorbing market shocks to prevent impermanent loss and maintain systemic equilibrium in derivative settlement processes. The high-tech design emphasizes transparency in complex risk management systems.](https://term.greeks.live/wp-content/uploads/2025/12/decentralized-finance-protocol-algorithmic-volatility-dampening-mechanism-for-derivative-settlement-optimization.webp)

Meaning ⎊ Non custodial wallet risks define the trade-off between absolute asset control and the transfer of operational security responsibility to the user.

### [Settlement Finality Protocols](https://term.greeks.live/term/settlement-finality-protocols/)
![A high-resolution cutaway visualization reveals the intricate internal architecture of a cross-chain bridging protocol, conceptually linking two separate blockchain networks. The precisely aligned gears represent the smart contract logic and consensus mechanisms required for secure asset transfers and atomic swaps. The central shaft, illuminated by a vibrant green glow, symbolizes the real-time flow of wrapped assets and data packets, facilitating interoperability between Layer-1 and Layer-2 solutions within the DeFi ecosystem.](https://term.greeks.live/wp-content/uploads/2025/12/cross-chain-interoperability-protocol-architecture-facilitating-decentralized-options-settlement-and-liquidity-bridging.webp)

Meaning ⎊ Settlement finality protocols provide the immutable foundation for irreversible digital asset transfers, essential for robust decentralized derivatives.

### [Fungibility Bias](https://term.greeks.live/definition/fungibility-bias/)
![A stylized 3D rendered object, reminiscent of a complex high-frequency trading bot, visually interprets algorithmic execution strategies. The object's sharp, protruding fins symbolize market volatility and directional bias, essential factors in short-term options trading. The glowing green lens represents real-time data analysis and alpha generation, highlighting the instantaneous processing of decentralized oracle data feeds to identify arbitrage opportunities. This complex structure represents advanced quantitative models utilized for liquidity provisioning and efficient collateralization management across sophisticated derivative markets like perpetual futures.](https://term.greeks.live/wp-content/uploads/2025/12/high-frequency-trading-algorithmic-execution-module-for-perpetual-futures-arbitrage-and-alpha-generation.webp)

Meaning ⎊ The irrational failure to treat identical assets or currencies as interchangeable, leading to suboptimal capital allocation.

### [Non-Interactive Proof Systems](https://term.greeks.live/term/non-interactive-proof-systems/)
![This abstract rendering illustrates the intricate composability of decentralized finance protocols. The complex, interwoven structure symbolizes the interplay between various smart contracts and automated market makers. A glowing green line represents real-time liquidity flow and data streams, vital for dynamic derivatives pricing models and risk management. This visual metaphor captures the non-linear complexities of perpetual swaps and options chains within cross-chain interoperability architectures. The design evokes the interconnected nature of collateralized debt positions and yield generation strategies in contemporary tokenomics.](https://term.greeks.live/wp-content/uploads/2025/12/interlocking-futures-and-options-liquidity-loops-representing-decentralized-finance-composability-architecture.webp)

Meaning ⎊ Non-Interactive Proof Systems provide the cryptographic foundation for scalable, private, and trustless verification in decentralized global markets.

### [Decentralized Financial Literacy](https://term.greeks.live/term/decentralized-financial-literacy/)
![A stylized, four-pointed abstract construct featuring interlocking dark blue and light beige layers. The complex structure serves as a metaphorical representation of a decentralized options contract or structured product. The layered components illustrate the relationship between the underlying asset and the derivative's intrinsic value. The sharp points evoke market volatility and execution risk within decentralized finance ecosystems, where financial engineering and advanced risk management frameworks are paramount for a robust market microstructure.](https://term.greeks.live/wp-content/uploads/2025/12/complex-financial-engineering-of-decentralized-options-contracts-and-tokenomics-in-market-microstructure.webp)

Meaning ⎊ Decentralized financial literacy enables participants to audit protocol logic and manage risk autonomously in trustless, algorithmic market environments.

### [Mempool Prioritization](https://term.greeks.live/definition/mempool-prioritization/)
![A stylized rendering of nested layers within a recessed component, visualizing advanced financial engineering concepts. The concentric elements represent stratified risk tranches within a decentralized finance DeFi structured product. The light and dark layers signify varying collateralization levels and asset types. The design illustrates the complexity and precision required in smart contract architecture for automated market makers AMMs to efficiently pool liquidity and facilitate the creation of synthetic assets.](https://term.greeks.live/wp-content/uploads/2025/12/advanced-risk-stratification-and-layered-collateralization-in-defi-structured-products.webp)

Meaning ⎊ The process of ordering pending transactions based on fee incentives to maximize validator revenue and execution speed.

---

## Raw Schema Data

```json
{
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    "itemListElement": [
        {
            "@type": "ListItem",
            "position": 1,
            "name": "Home",
            "item": "https://term.greeks.live/"
        },
        {
            "@type": "ListItem",
            "position": 2,
            "name": "Definition",
            "item": "https://term.greeks.live/definition/"
        },
        {
            "@type": "ListItem",
            "position": 3,
            "name": "Reorg Attack",
            "item": "https://term.greeks.live/definition/reorg-attack/"
        }
    ]
}
```

```json
{
    "@context": "https://schema.org",
    "@type": "Article",
    "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": "https://term.greeks.live/definition/reorg-attack/"
    },
    "headline": "Reorg Attack ⎊ Definition",
    "description": "Meaning ⎊ A hostile attempt to rewrite blockchain history by mining a longer chain to revert transactions and double spend. ⎊ Definition",
    "url": "https://term.greeks.live/definition/reorg-attack/",
    "author": {
        "@type": "Person",
        "name": "Greeks.live",
        "url": "https://term.greeks.live/author/greeks-live/"
    },
    "datePublished": "2026-04-01T21:36:43+00:00",
    "dateModified": "2026-04-01T21:37:26+00:00",
    "publisher": {
        "@type": "Organization",
        "name": "Greeks.live"
    },
    "articleSection": [
        "Definition"
    ],
    "image": {
        "@type": "ImageObject",
        "url": "https://term.greeks.live/wp-content/uploads/2025/12/multi-layered-collateralized-debt-obligation-structure-and-risk-tranching-in-decentralized-finance-derivatives.jpg",
        "caption": "This close-up view shows a cross-section of a multi-layered structure with concentric rings of varying colors, including dark blue, beige, green, and white. The layers appear to be separating, revealing the intricate components underneath."
    }
}
```


---

**Original URL:** https://term.greeks.live/definition/reorg-attack/