# State Validity Checks ⎊ Area ⎊ Greeks.live --- ## What is the Mechanism of State Validity Checks? State validity checks serve as the foundational architecture for verifying the integrity of distributed ledger transitions and derivative contract execution. These operations confirm that every proposed ledger update adheres to predefined protocol rules, preventing illegal state shifts such as double-spending or unauthorized margin collateral allocation. By rigorously parsing input against the current global state, the system ensures that decentralized derivatives maintain consistency across nodes. ## What is the Constraint of State Validity Checks? Rigid boundary conditions define the permissible range for transactional variables, including strike price adjustments and underlying asset oracle feeds. These rules enforce strict adherence to the smart contract logic, immediately rejecting any state transition that would lead to insolvency or a breach of margin requirements. Quantifiable thresholds act as automated safeguards that maintain market stability by neutralizing erroneous or malicious inputs before they reach finality. ## What is the Security of State Validity Checks? Institutional-grade risk management relies on these verification procedures to insulate the clearinghouse from systemic failure and counterparty risk. Validating the state before updating the derivative record protects participants from the cascading effects of invalid trade executions or liquidity drainage. Implementing such deep-layer oversight is critical for maintaining market trust and ensuring that high-frequency trading activities align with the protocol economic incentives. --- ## [State Transition Consistency](https://term.greeks.live/definition/state-transition-consistency/) The mathematical assurance that every ledger change follows strict, predefined rules to maintain valid account balances. ⎊ Definition ## [Automated Security Checks](https://term.greeks.live/term/automated-security-checks/) Meaning ⎊ Automated security checks provide the deterministic, real-time risk enforcement necessary to maintain solvency within decentralized derivative markets. ⎊ Definition ## [Data Integrity Checks](https://term.greeks.live/term/data-integrity-checks/) Meaning ⎊ Data integrity checks are the cryptographic mechanisms ensuring accurate input validation to maintain solvency and reliability in derivative markets. ⎊ Definition ## [Checks-Effects-Interactions Pattern](https://term.greeks.live/definition/checks-effects-interactions-pattern/) Coding pattern ensuring state updates occur before external calls to prevent reentrancy and unauthorized state manipulation. ⎊ Definition ## [Checks-Effects-Interactions](https://term.greeks.live/definition/checks-effects-interactions/) Coding pattern requiring checks, then state updates, and finally external interactions to prevent reentrancy. ⎊ Definition ## [Validity-Proof Models](https://term.greeks.live/term/validity-proof-models/) Meaning ⎊ Validity-Proof Models provide the mathematical assurance required for trustless, high-throughput settlement in decentralized derivative markets. ⎊ Definition ## [Proof of Validity in Blockchain](https://term.greeks.live/term/proof-of-validity-in-blockchain/) Meaning ⎊ Proof of Validity provides cryptographic certainty for state transitions, enabling secure, high-throughput decentralized financial systems. ⎊ Definition ## [Cross-Chain Validity Proofs](https://term.greeks.live/term/cross-chain-validity-proofs/) Meaning ⎊ Cross-chain validity proofs provide the cryptographic foundation for trustless, secure state transitions across fragmented decentralized networks. ⎊ Definition ## [Backtesting Validity](https://term.greeks.live/definition/backtesting-validity/) The degree to which historical simulation results accurately predict live performance, free from overfitting and data biases. ⎊ Definition ## [Validity Proof Systems](https://term.greeks.live/term/validity-proof-systems/) Meaning ⎊ Validity Proof Systems provide trustless, mathematically guaranteed settlement for decentralized assets by replacing redundant execution with proofs. ⎊ Definition ## [Validity Proof Settlement](https://term.greeks.live/term/validity-proof-settlement/) Meaning ⎊ Validity Proof Settlement utilizes cryptographic verification to ensure deterministic, immutable, and high-speed finality for decentralized finance. ⎊ Definition ## [Strategy Validity Assessment](https://term.greeks.live/definition/strategy-validity-assessment/) The rigorous analytical verification that a trading logic is statistically sound, execution-ready, and risk-adjusted. ⎊ Definition ## [Smart Contract Solvency Checks](https://term.greeks.live/term/smart-contract-solvency-checks/) Meaning ⎊ Smart Contract Solvency Checks are the automated mechanisms that ensure protocol integrity by verifying collateral adequacy in real-time. ⎊ Definition ## [Real-Time Validity](https://term.greeks.live/term/real-time-validity/) Meaning ⎊ Real-Time Validity ensures decentralized derivative settlement remains tethered to global market prices by enforcing strict data freshness constraints. ⎊ Definition ## [Trend Validity](https://term.greeks.live/definition/trend-validity/) The statistical confirmation that a price direction is sustained by volume, order flow, and structural market integrity. ⎊ Definition ## [Pre-Transaction Solvency Checks](https://term.greeks.live/term/pre-transaction-solvency-checks/) Meaning ⎊ Pre-transaction solvency checks automate collateral verification to prevent systemic insolvency and ensure settlement integrity in decentralized venues. ⎊ Definition ## [Cryptographic Validity Proofs](https://term.greeks.live/term/cryptographic-validity-proofs/) Meaning ⎊ Cryptographic Validity Proofs provide mathematical guarantees for state transitions, enabling trustless and scalable settlement for global markets. ⎊ Definition ## [Private Transaction Validity](https://term.greeks.live/term/private-transaction-validity/) Meaning ⎊ Private Transaction Validity provides cryptographic assurance of protocol compliance and solvency without exposing sensitive transaction data to the public. ⎊ Definition ## [ZK Rollup Validity Proofs](https://term.greeks.live/term/zk-rollup-validity-proofs/) Meaning ⎊ ZK Validity Proofs enable capital-efficient, low-latency, and privacy-preserving settlement of decentralized options by cryptographically verifying off-chain state transitions. ⎊ Definition ## [Rollup State Verification](https://term.greeks.live/term/rollup-state-verification/) Meaning ⎊ Rollup State Verification anchors off-chain execution to Layer 1 security through cryptographic proofs ensuring the integrity of state transitions. ⎊ Definition ## [State Root Calculation](https://term.greeks.live/term/state-root-calculation/) Meaning ⎊ The State Root Calculation is the cryptographic commitment to the blockchain's global state, enabling trustless, low-latency settlement and collateral verification for crypto derivatives. ⎊ Definition ## [Blockchain State Fees](https://term.greeks.live/term/blockchain-state-fees/) Meaning ⎊ Blockchain state fees represent the economic cost of maintaining persistent data on a ledger to prevent node centralization and state expansion. ⎊ Definition ## [Delta-Neutral State](https://term.greeks.live/term/delta-neutral-state/) Meaning ⎊ The Delta-Neutral State is a quantitative risk architecture that zeroes a portfolio's directional exposure to isolate and monetize volatility and time decay. ⎊ Definition ## [Blockchain State Transition](https://term.greeks.live/term/blockchain-state-transition/) Meaning ⎊ The Atomic Settlement Commitment is the irreversible, single-block finalization of a crypto derivative's contractual obligations, eliminating counterparty risk through cryptographic certainty. ⎊ Definition ## [Zero-Knowledge Validity Proofs](https://term.greeks.live/term/zero-knowledge-validity-proofs/) Meaning ⎊ Zero-Knowledge Validity Proofs enable deterministic verification of financial state transitions while maintaining absolute data confidentiality. ⎊ Definition ## [Cross-Chain State Proofs](https://term.greeks.live/term/cross-chain-state-proofs/) Meaning ⎊ Cross-Chain State Proofs provide the cryptographic verification of external ledger states required for trustless settlement in derivative markets. ⎊ Definition ## [Zero Knowledge Proof Order Validity](https://term.greeks.live/term/zero-knowledge-proof-order-validity/) Meaning ⎊ Zero Knowledge Proof Order Validity uses cryptography to prove an options order is solvent and valid without revealing its size or collateral, mitigating front-running and stabilizing decentralized markets. ⎊ Definition ## [Blockchain State Verification](https://term.greeks.live/term/blockchain-state-verification/) Meaning ⎊ Blockchain State Verification uses cryptographic proofs to assert the validity of derivatives state and collateral with logarithmic cost, enabling high-throughput, capital-efficient options markets. ⎊ Definition ## [Real Time Market State Synchronization](https://term.greeks.live/term/real-time-market-state-synchronization/) Meaning ⎊ Real Time Market State Synchronization ensures continuous mathematical alignment between on-chain derivative valuations and live global volatility data. ⎊ Definition ## [Real-Time Solvency Checks](https://term.greeks.live/term/real-time-solvency-checks/) Meaning ⎊ Real-Time Solvency Checks provide a continuous, cryptographic verification of collateralization to prevent systemic failure in decentralized markets. ⎊ Definition --- ## 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": "Area", "item": "https://term.greeks.live/area/" }, { "@type": "ListItem", "position": 3, "name": "State Validity Checks", "item": "https://term.greeks.live/area/state-validity-checks/" } ] } ``` ```json { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is the Mechanism of State Validity Checks?", "acceptedAnswer": { "@type": "Answer", "text": "State validity checks serve as the foundational architecture for verifying the integrity of distributed ledger transitions and derivative contract execution. 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The design emphasizes sharp geometric forms and clean lines against a dark background." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/cryptographic-validity-proofs/", "url": "https://term.greeks.live/term/cryptographic-validity-proofs/", "headline": "Cryptographic Validity Proofs", "description": "Meaning ⎊ Cryptographic Validity Proofs provide mathematical guarantees for state transitions, enabling trustless and scalable settlement for global markets. ⎊ Definition", "datePublished": "2026-02-14T08:58:50+00:00", "dateModified": "2026-02-14T09:00:15+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/asymmetric-cryptographic-key-pair-protection-within-cold-storage-hardware-wallet-for-multisig-transactions.jpg", "width": 3850, "height": 2166, "caption": "A close-up shot captures two smooth rectangular blocks, one blue and one green, resting within a dark, deep blue recessed cavity. The blocks fit tightly together, suggesting a pair of components in a secure housing." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/private-transaction-validity/", "url": "https://term.greeks.live/term/private-transaction-validity/", "headline": "Private Transaction Validity", "description": "Meaning ⎊ Private Transaction Validity provides cryptographic assurance of protocol compliance and solvency without exposing sensitive transaction data to the public. ⎊ Definition", "datePublished": "2026-02-12T13:32:01+00:00", "dateModified": "2026-02-12T14:00:19+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/smart-contract-security-vulnerability-and-private-key-management-for-decentralized-finance-protocols.jpg", "width": 3850, "height": 2166, "caption": "A stylized, colorful padlock featuring blue, green, and cream sections has a key inserted into its central keyhole. The key is positioned vertically, suggesting the act of unlocking or validating access within a secure system." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/zk-rollup-validity-proofs/", "url": "https://term.greeks.live/term/zk-rollup-validity-proofs/", "headline": "ZK Rollup Validity Proofs", "description": "Meaning ⎊ ZK Validity Proofs enable capital-efficient, low-latency, and privacy-preserving settlement of decentralized options by cryptographically verifying off-chain state transitions. ⎊ Definition", "datePublished": "2026-02-06T10:48:57+00:00", "dateModified": "2026-02-06T10:51:24+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/dynamic-visualization-of-decentralized-finance-liquidity-flow-and-risk-mitigation-in-complex-options-derivatives.jpg", "width": 3850, "height": 2166, "caption": "A high-tech abstract form featuring smooth dark surfaces and prominent bright green and light blue highlights within a recessed, dark container. The design gives a sense of sleek, futuristic technology and dynamic movement." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/rollup-state-verification/", "url": "https://term.greeks.live/term/rollup-state-verification/", "headline": "Rollup State Verification", "description": "Meaning ⎊ Rollup State Verification anchors off-chain execution to Layer 1 security through cryptographic proofs ensuring the integrity of state transitions. ⎊ Definition", "datePublished": "2026-02-04T18:14:25+00:00", "dateModified": "2026-02-04T18:38:09+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/decentralized-finance-amm-liquidity-module-processing-perpetual-swap-collateralization-and-volatility-hedging-strategies.jpg", "width": 3850, "height": 2166, "caption": "A futuristic, close-up view shows a modular cylindrical mechanism encased in dark housing. The central component glows with segmented green light, suggesting an active operational state and data processing." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/state-root-calculation/", "url": "https://term.greeks.live/term/state-root-calculation/", "headline": "State Root Calculation", "description": "Meaning ⎊ The State Root Calculation is the cryptographic commitment to the blockchain's global state, enabling trustless, low-latency settlement and collateral verification for crypto derivatives. ⎊ Definition", "datePublished": "2026-02-02T13:17:11+00:00", "dateModified": "2026-02-02T13:20:49+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/decentralized-finance-amm-liquidity-module-processing-perpetual-swap-collateralization-and-volatility-hedging-strategies.jpg", "width": 3850, "height": 2166, "caption": "A futuristic, close-up view shows a modular cylindrical mechanism encased in dark housing. The central component glows with segmented green light, suggesting an active operational state and data processing." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/blockchain-state-fees/", "url": "https://term.greeks.live/term/blockchain-state-fees/", "headline": "Blockchain State Fees", "description": "Meaning ⎊ Blockchain state fees represent the economic cost of maintaining persistent data on a ledger to prevent node centralization and state expansion. ⎊ Definition", "datePublished": "2026-02-02T13:13:15+00:00", "dateModified": "2026-02-02T13:14:21+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/scalable-blockchain-architecture-flow-optimization-through-layered-protocols-and-automated-liquidity-provision.jpg", "width": 3850, "height": 2166, "caption": "The image showcases layered, interconnected abstract structures in shades of dark blue, cream, and vibrant green. These structures create a sense of dynamic movement and flow against a dark background, highlighting complex internal workings." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/delta-neutral-state/", "url": "https://term.greeks.live/term/delta-neutral-state/", "headline": "Delta-Neutral State", "description": "Meaning ⎊ The Delta-Neutral State is a quantitative risk architecture that zeroes a portfolio's directional exposure to isolate and monetize volatility and time decay. ⎊ Definition", "datePublished": "2026-02-01T18:18:35+00:00", "dateModified": "2026-02-01T18:20:48+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/abstract-visualization-of-cross-chain-liquidity-provision-and-delta-neutral-futures-hedging-strategies-in-defi-ecosystems.jpg", "width": 3850, "height": 2166, "caption": "Two smooth, twisting abstract forms are intertwined against a dark background, showcasing a complex, interwoven design. The forms feature distinct color bands of dark blue, white, light blue, and green, highlighting a precise structure where different components connect." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/blockchain-state-transition/", "url": "https://term.greeks.live/term/blockchain-state-transition/", "headline": "Blockchain State Transition", "description": "Meaning ⎊ The Atomic Settlement Commitment is the irreversible, single-block finalization of a crypto derivative's contractual obligations, eliminating counterparty risk through cryptographic certainty. ⎊ Definition", "datePublished": "2026-02-01T16:32:01+00:00", "dateModified": "2026-02-01T16:34:00+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/dynamic-visualization-of-options-contract-state-transition-in-the-money-versus-out-the-money-derivatives-pricing.jpg", "width": 3850, "height": 2166, "caption": "A dark, sleek, futuristic object features two embedded spheres: a prominent, brightly illuminated green sphere and a less illuminated, recessed blue sphere. The contrast between these two elements is central to the image composition." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/zero-knowledge-validity-proofs/", "url": "https://term.greeks.live/term/zero-knowledge-validity-proofs/", "headline": "Zero-Knowledge Validity Proofs", "description": "Meaning ⎊ Zero-Knowledge Validity Proofs enable deterministic verification of financial state transitions while maintaining absolute data confidentiality. ⎊ Definition", "datePublished": "2026-02-01T15:38:25+00:00", "dateModified": "2026-02-01T15:38:33+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/decentralized-options-protocol-architecture-layered-collateralization-yield-generation-and-smart-contract-execution.jpg", "width": 3850, "height": 2166, "caption": "An abstract composition features flowing, layered forms in dark blue, green, and cream colors, with a bright green glow emanating from a central recess. The image visually represents the complex structure of a decentralized derivatives protocol, where layered financial instruments, such as options contracts and perpetual futures, interact within a smart contract-driven environment." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/cross-chain-state-proofs/", "url": "https://term.greeks.live/term/cross-chain-state-proofs/", "headline": "Cross-Chain State Proofs", "description": "Meaning ⎊ Cross-Chain State Proofs provide the cryptographic verification of external ledger states required for trustless settlement in derivative markets. ⎊ Definition", "datePublished": "2026-02-01T15:21:55+00:00", "dateModified": "2026-02-01T15:22:28+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/decentralized-protocol-architecture-visualizing-immutable-cross-chain-data-interoperability-and-smart-contract-triggers.jpg", "width": 3850, "height": 2166, "caption": "A dynamic, interlocking chain of metallic elements in shades of deep blue, green, and beige twists diagonally across a dark backdrop. The central focus features glowing green components, with one clearly displaying a stylized letter \"F,\" highlighting key points in the structure." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/zero-knowledge-proof-order-validity/", "url": "https://term.greeks.live/term/zero-knowledge-proof-order-validity/", "headline": "Zero Knowledge Proof Order Validity", "description": "Meaning ⎊ Zero Knowledge Proof Order Validity uses cryptography to prove an options order is solvent and valid without revealing its size or collateral, mitigating front-running and stabilizing decentralized markets. ⎊ Definition", "datePublished": "2026-01-29T04:53:51+00:00", "dateModified": "2026-01-29T04:54:44+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/algorithmic-trading-liquidity-dynamics-visualization-across-layer-2-scaling-solutions-and-derivatives-market-depth.jpg", "width": 3850, "height": 2166, "caption": "A series of concentric rings in varying shades of blue, green, and white creates a visual tunnel effect, providing a dynamic perspective toward a central light source. This abstract composition represents the complex market microstructure and layered architecture of decentralized finance protocols." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/blockchain-state-verification/", "url": "https://term.greeks.live/term/blockchain-state-verification/", "headline": "Blockchain State Verification", "description": "Meaning ⎊ Blockchain State Verification uses cryptographic proofs to assert the validity of derivatives state and collateral with logarithmic cost, enabling high-throughput, capital-efficient options markets. ⎊ Definition", "datePublished": "2026-01-29T03:03:33+00:00", "dateModified": "2026-01-29T03:05:15+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/algorithmic-collateralization-mechanism-for-cross-chain-asset-tokenization-and-advanced-defi-derivative-securitization.jpg", "width": 3850, "height": 2166, "caption": "A minimalist, dark blue object, shaped like a carabiner, holds a light-colored, bone-like internal component against a dark background. A circular green ring glows at the object's pivot point, providing a stark color contrast." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/real-time-market-state-synchronization/", "url": "https://term.greeks.live/term/real-time-market-state-synchronization/", "headline": "Real Time Market State Synchronization", "description": "Meaning ⎊ Real Time Market State Synchronization ensures continuous mathematical alignment between on-chain derivative valuations and live global volatility data. ⎊ Definition", "datePublished": "2026-01-22T09:56:48+00:00", "dateModified": "2026-01-22T09:58:30+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/real-time-volatility-metrics-visualization-for-exotic-options-contracts-algorithmic-trading-dashboard.jpg", "width": 3850, "height": 2166, "caption": "A close-up view reveals a futuristic, high-tech instrument with a prominent circular gauge. The gauge features a glowing green ring and two pointers on a detailed, mechanical dial, set against a dark blue and light green chassis." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/real-time-solvency-checks/", "url": "https://term.greeks.live/term/real-time-solvency-checks/", "headline": "Real-Time Solvency Checks", "description": "Meaning ⎊ Real-Time Solvency Checks provide a continuous, cryptographic verification of collateralization to prevent systemic failure in decentralized markets. ⎊ Definition", "datePublished": "2026-01-16T15:02:21+00:00", "dateModified": "2026-01-16T15:02:33+00:00", "author": { "@type": "Person", "name": "Greeks.live", "url": "https://term.greeks.live/author/greeks-live/" }, "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/decentralized-finance-oracle-and-algorithmic-trading-sentinel-for-price-feed-aggregation-and-risk-mitigation.jpg", "width": 3850, "height": 2166, "caption": "The image displays a hard-surface rendered, futuristic mechanical head or sentinel, featuring a white angular structure on the left side, a central dark blue section, and a prominent teal-green polygonal eye socket housing a glowing green sphere. The design emphasizes sharp geometric forms and clean lines against a dark background." } } ], "image": { "@type": "ImageObject", "url": "https://term.greeks.live/wp-content/uploads/2025/12/visualizing-portfolio-risk-stratification-for-cryptocurrency-options-and-derivatives-trading-strategies.jpg" } } ``` --- **Original URL:** https://term.greeks.live/area/state-validity-checks/