# Layer Two Security Measures ⎊ Area ⎊ Greeks.live --- ## What is the Architecture of Layer Two Security Measures? Layer Two security measures fundamentally reshape the underlying architecture of blockchain systems, particularly within cryptocurrency and derivatives contexts. These solutions operate "off-chain," meaning transactions and computations occur outside the primary blockchain, subsequently settling on the main chain. This approach enhances scalability and reduces congestion on the core ledger, while simultaneously introducing novel security considerations that require careful design and implementation. The layered approach necessitates robust communication protocols and validation mechanisms to ensure data integrity and prevent malicious actors from exploiting vulnerabilities in the off-chain environment. ## What is the Cryptography of Layer Two Security Measures? Advanced cryptographic techniques are integral to the efficacy of Layer Two security protocols. Zero-knowledge proofs, for instance, allow verification of transaction validity without revealing sensitive information, bolstering privacy and mitigating certain attack vectors. Homomorphic encryption enables computations on encrypted data, further enhancing confidentiality and enabling secure processing of complex derivatives contracts. The selection and implementation of appropriate cryptographic primitives are paramount, demanding rigorous analysis and adherence to industry best practices to withstand evolving threats. ## What is the Validation of Layer Two Security Measures? Layer Two systems rely on sophisticated validation processes to maintain the integrity of off-chain transactions and ensure their accurate settlement on the main chain. These processes often involve a network of validators who stake tokens to incentivize honest behavior and penalize malicious actions. Consensus mechanisms, adapted for the Layer Two environment, are crucial for reaching agreement on the state of the system and preventing double-spending or other fraudulent activities. The design of these validation mechanisms must balance security, efficiency, and decentralization to create a robust and trustworthy ecosystem. --- ## [Replay Protection](https://term.greeks.live/definition/replay-protection/) A feature preventing a transaction from being validly executed on two separate versions of a forked blockchain. ⎊ Definition ## [Protocol Stability Measures](https://term.greeks.live/term/protocol-stability-measures/) Meaning ⎊ Protocol Stability Measures provide the mathematical and algorithmic framework necessary to anchor decentralized derivatives to their reference assets. ⎊ Definition ## [Transaction Security Measures](https://term.greeks.live/term/transaction-security-measures/) Meaning ⎊ Transaction security measures utilize cryptographic protocols to ensure the integrity, solvency, and deterministic settlement of decentralized options. ⎊ Definition ## [Physical Security Measures](https://term.greeks.live/term/physical-security-measures/) Meaning ⎊ Physical security measures provide the essential infrastructure to protect cryptographic keys and validator integrity within decentralized markets. ⎊ Definition ## [On-Chain Security Measures](https://term.greeks.live/term/on-chain-security-measures/) Meaning ⎊ On-Chain Security Measures provide the autonomous cryptographic foundation required to maintain systemic integrity within decentralized derivative markets. ⎊ Definition ## [Contagion Control Measures](https://term.greeks.live/term/contagion-control-measures/) Meaning ⎊ Contagion control measures secure decentralized derivative markets by automating risk isolation and preventing systemic failures during volatility. ⎊ Definition ## [Consensus Layer Game Theory](https://term.greeks.live/term/consensus-layer-game-theory/) Meaning ⎊ Consensus layer game theory secures decentralized networks by aligning validator incentives with protocol integrity through economic risk and reward. ⎊ Definition ## [Zero-Knowledge Derivatives Layer](https://term.greeks.live/term/zero-knowledge-derivatives-layer/) Meaning ⎊ A Zero-Knowledge Derivatives Layer secures decentralized financial contracts by enabling private, verifiable execution and risk management at scale. ⎊ Definition ## [Settlement Layer Transparency](https://term.greeks.live/term/settlement-layer-transparency/) Meaning ⎊ Settlement layer transparency provides verifiable proof of collateral backing and trade finality to eliminate systemic counterparty risk. ⎊ Definition ## [Global Zero-Knowledge Clearing Layer](https://term.greeks.live/term/global-zero-knowledge-clearing-layer/) Meaning ⎊ The Global Zero-Knowledge Clearing Layer provides privacy-preserving, automated collateral verification for cross-border decentralized derivatives. ⎊ Definition ## [Off Chain Computation Layer](https://term.greeks.live/term/off-chain-computation-layer/) Meaning ⎊ Off Chain Computation Layer provides the scalable infrastructure necessary to execute complex derivative pricing and risk management at speed. ⎊ Definition ## [Settlement Layer Integrity](https://term.greeks.live/term/settlement-layer-integrity/) Meaning ⎊ Settlement layer integrity ensures the verifiable and autonomous finality of derivative contract outcomes within decentralized financial ecosystems. ⎊ Definition ## [Hybrid Options Settlement Layer](https://term.greeks.live/term/hybrid-options-settlement-layer/) Meaning ⎊ The Hybrid Options Settlement Layer optimizes derivative markets by offloading complex margin and settlement tasks to efficient, secure off-chain states. ⎊ Definition ## [Exchange Security Measures](https://term.greeks.live/term/exchange-security-measures/) Meaning ⎊ Exchange security measures ensure the integrity of collateral and the reliability of settlement within high-leverage digital asset derivatives markets. ⎊ Definition ## [Layer-Two Protocol](https://term.greeks.live/definition/layer-two-protocol/) A secondary framework built atop a base blockchain to enhance transaction throughput, speed, and cost-efficiency. ⎊ Definition ## [Execution Layer Security](https://term.greeks.live/definition/execution-layer-security/) The technical protection of the virtual machine and consensus processes that execute and finalize smart contract code. ⎊ Definition ## [Layer 2 Scaling Solutions](https://term.greeks.live/definition/layer-2-scaling-solutions-2/) Secondary protocols designed to increase blockchain throughput and reduce costs by offloading transaction processing. ⎊ Definition ## [Layer 0 Message Passing Systems](https://term.greeks.live/term/layer-0-message-passing-systems/) Meaning ⎊ Layer 0 Message Passing Systems serve as the secure, trust-minimized foundation for unified cross-chain liquidity and decentralized financial settlement. ⎊ Definition ## [Blockchain Security Measures](https://term.greeks.live/term/blockchain-security-measures/) Meaning ⎊ Blockchain security measures establish the cryptographic and economic foundations necessary to protect decentralized value transfer from adversarial risk. ⎊ Definition ## [Public Verification Layer](https://term.greeks.live/term/public-verification-layer/) Meaning ⎊ A Public Verification Layer serves as the foundational cryptographic audit trail for decentralized derivatives to ensure settlement integrity. ⎊ Definition ## [Regulatory Compliance Measures](https://term.greeks.live/term/regulatory-compliance-measures/) Meaning ⎊ Regulatory Compliance Measures serve as the essential bridge between decentralized derivative protocols and global legal accountability frameworks. ⎊ Definition ## [Protocol Layer Diversification](https://term.greeks.live/definition/protocol-layer-diversification/) Spreading investments across multiple blockchain protocols and ecosystems to mitigate technical and security risks. ⎊ Definition ## [Coherent Risk Measures](https://term.greeks.live/definition/coherent-risk-measures/) A set of mathematical properties that ensure a risk measure is logically consistent and supports portfolio diversification. ⎊ Definition ## [Cryptographic Security Measures](https://term.greeks.live/term/cryptographic-security-measures/) Meaning ⎊ Cryptographic security measures provide the immutable, verifiable foundation necessary for the reliable settlement of decentralized financial derivatives. ⎊ Definition ## [Investor Protection Measures](https://term.greeks.live/term/investor-protection-measures/) Meaning ⎊ Investor protection measures in crypto derivatives provide automated, transparent safeguards to ensure systemic stability and capital preservation. ⎊ Definition ## [Realized Volatility Measures](https://term.greeks.live/term/realized-volatility-measures/) Meaning ⎊ Realized volatility measures provide the empirical foundation for quantifying historical price dispersion to inform robust derivative risk management. ⎊ Definition ## [Multi Layer Solvency Engines](https://term.greeks.live/term/multi-layer-solvency-engines/) Meaning ⎊ Multi Layer Solvency Engines provide automated, tiered risk management to maintain protocol stability during extreme decentralized market volatility. ⎊ Definition ## [Risk Sensitivity Measures](https://term.greeks.live/term/risk-sensitivity-measures/) Meaning ⎊ Risk sensitivity measures provide the essential quantitative framework for navigating the non-linear risks inherent in decentralized derivative markets. ⎊ Definition ## [Blockchain Settlement Layer](https://term.greeks.live/term/blockchain-settlement-layer/) Meaning ⎊ The Blockchain Settlement Layer provides the immutable infrastructure for programmatic collateral management and near-instant finality in derivatives. ⎊ Definition ## [Settlement Layer Failure](https://term.greeks.live/term/settlement-layer-failure/) Meaning ⎊ Settlement layer failure represents the critical, system-wide breakdown of transaction finality that threatens the integrity of derivative 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": "Layer Two Security Measures", "item": "https://term.greeks.live/area/layer-two-security-measures/" } ] } ``` ```json { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is the Architecture of Layer Two Security Measures?", "acceptedAnswer": { "@type": "Answer", "text": "Layer Two security measures fundamentally reshape the underlying architecture of blockchain systems, particularly within cryptocurrency and derivatives contexts. 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This structure serves as a conceptual model for a modular blockchain ecosystem, illustrating how different components of a decentralized finance DeFi stack interact." } }, { "@type": "Article", "@id": "https://term.greeks.live/definition/layer-2-scaling-solutions-2/", "url": "https://term.greeks.live/definition/layer-2-scaling-solutions-2/", "headline": "Layer 2 Scaling Solutions", "description": "Secondary protocols designed to increase blockchain throughput and reduce costs by offloading transaction processing. ⎊ Definition", "datePublished": "2026-03-12T22:11:29+00:00", "dateModified": "2026-03-13T15:37:18+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/visualizing-multi-asset-collateralization-in-structured-finance-derivatives-and-yield-generation.jpg", "width": 3850, "height": 2166, "caption": "This abstract composition features layered cylindrical forms rendered in dark blue, cream, and bright green, arranged concentrically to suggest a cross-sectional view of a structured mechanism. The central bright green element extends outward in a conical shape, creating a focal point against the dark background." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/layer-0-message-passing-systems/", "url": "https://term.greeks.live/term/layer-0-message-passing-systems/", "headline": "Layer 0 Message Passing Systems", "description": "Meaning ⎊ Layer 0 Message Passing Systems serve as the secure, trust-minimized foundation for unified cross-chain liquidity and decentralized financial settlement. ⎊ Definition", "datePublished": "2026-03-12T20:18:52+00:00", "dateModified": "2026-03-12T20:19:23+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/analyzing-nested-protocol-layers-and-structured-financial-products-in-decentralized-autonomous-organization-architecture.jpg", "width": 3850, "height": 2166, "caption": "A cross-sectional view displays concentric cylindrical layers nested within one another, with a dark blue outer component partially enveloping the inner structures. The inner layers include a light beige form, various shades of blue, and a vibrant green core, suggesting depth and structural complexity." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/blockchain-security-measures/", "url": "https://term.greeks.live/term/blockchain-security-measures/", "headline": "Blockchain Security Measures", "description": "Meaning ⎊ Blockchain security measures establish the cryptographic and economic foundations necessary to protect decentralized value transfer from adversarial risk. ⎊ Definition", "datePublished": "2026-03-12T17:47:02+00:00", "dateModified": "2026-03-12T17:48:15+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/complex-crypto-derivatives-architecture-with-nested-smart-contracts-and-multi-layered-security-protocols.jpg", "width": 3850, "height": 2166, "caption": "An intricate geometric object floats against a dark background, showcasing multiple interlocking frames in deep blue, cream, and green. At the core of the structure, a luminous green circular element provides a focal point, emphasizing the complexity of the nested layers." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/public-verification-layer/", "url": "https://term.greeks.live/term/public-verification-layer/", "headline": "Public Verification Layer", "description": "Meaning ⎊ A Public Verification Layer serves as the foundational cryptographic audit trail for decentralized derivatives to ensure settlement integrity. ⎊ Definition", "datePublished": "2026-03-12T14:53:31+00:00", "dateModified": "2026-03-12T14:53:53+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-layered-architecture-representing-risk-management-collateralization-structures-and-protocol-composability.jpg", "width": 3850, "height": 2166, "caption": "This abstract illustration depicts multiple concentric layers and a central cylindrical structure within a dark, recessed frame. The layers transition in color from deep blue to bright green and cream, creating a sense of depth and intricate design." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/regulatory-compliance-measures/", "url": "https://term.greeks.live/term/regulatory-compliance-measures/", "headline": "Regulatory Compliance Measures", "description": "Meaning ⎊ Regulatory Compliance Measures serve as the essential bridge between decentralized derivative protocols and global legal accountability frameworks. ⎊ Definition", "datePublished": "2026-03-12T11:04:50+00:00", "dateModified": "2026-03-12T11:05:51+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/multi-layered-collateralized-debt-position-architecture-with-wrapped-asset-tokenization-and-decentralized-protocol-tranching.jpg", "width": 3850, "height": 2166, "caption": "A macro photograph displays a close-up perspective of a multi-part cylindrical object, featuring concentric layers of dark blue, light blue, and bright green materials. The structure highlights a central, circular aperture within the innermost green core." } }, { "@type": "Article", "@id": "https://term.greeks.live/definition/protocol-layer-diversification/", "url": "https://term.greeks.live/definition/protocol-layer-diversification/", "headline": "Protocol Layer Diversification", "description": "Spreading investments across multiple blockchain protocols and ecosystems to mitigate technical and security risks. ⎊ Definition", "datePublished": "2026-03-12T10:29:51+00:00", "dateModified": "2026-03-12T10:30:40+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/interoperable-layer-two-scaling-solutions-architecture-for-cross-chain-collateralized-debt-positions.jpg", "width": 3850, "height": 2166, "caption": "The image displays a complex mechanical component featuring a layered concentric design in dark blue, cream, and vibrant green. The central green element resembles a threaded core, surrounded by progressively larger rings and an angular, faceted outer shell." } }, { "@type": "Article", "@id": "https://term.greeks.live/definition/coherent-risk-measures/", "url": "https://term.greeks.live/definition/coherent-risk-measures/", "headline": "Coherent Risk Measures", "description": "A set of mathematical properties that ensure a risk measure is logically consistent and supports portfolio diversification. ⎊ Definition", "datePublished": "2026-03-12T06:12:57+00:00", "dateModified": "2026-03-12T06:13:38+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/interlocked-derivatives-tranches-illustrating-collateralized-debt-positions-and-dynamic-risk-stratification.jpg", "width": 3850, "height": 2166, "caption": "A close-up view presents a series of nested, circular bands in colors including teal, cream, navy blue, and neon green. The layers diminish in size towards the center, creating a sense of depth, with the outermost teal layer featuring cutouts along its surface." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/cryptographic-security-measures/", "url": "https://term.greeks.live/term/cryptographic-security-measures/", "headline": "Cryptographic Security Measures", "description": "Meaning ⎊ Cryptographic security measures provide the immutable, verifiable foundation necessary for the reliable settlement of decentralized financial derivatives. ⎊ Definition", "datePublished": "2026-03-12T03:51:38+00:00", "dateModified": "2026-03-12T03:52:14+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/green-vortex-depicting-decentralized-finance-liquidity-pool-smart-contract-execution-and-high-frequency-trading.jpg", "width": 3850, "height": 2166, "caption": "A dark, abstract image features a circular, mechanical structure surrounding a brightly glowing green vortex. The outer segments of the structure glow faintly in response to the central light source, creating a sense of dynamic energy within a decentralized finance ecosystem." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/investor-protection-measures/", "url": "https://term.greeks.live/term/investor-protection-measures/", "headline": "Investor Protection Measures", "description": "Meaning ⎊ Investor protection measures in crypto derivatives provide automated, transparent safeguards to ensure systemic stability and capital preservation. ⎊ Definition", "datePublished": "2026-03-12T00:09:12+00:00", "dateModified": "2026-03-12T00:09:26+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-execution-interface-representing-scalability-protocol-layering-and-decentralized-derivatives-liquidity-flow.jpg", "width": 3850, "height": 2166, "caption": "The image displays a detailed close-up of a futuristic device interface featuring a bright green cable connecting to a mechanism. A rectangular beige button is set into a teal surface, surrounded by layered, dark blue contoured panels." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/realized-volatility-measures/", "url": "https://term.greeks.live/term/realized-volatility-measures/", "headline": "Realized Volatility Measures", "description": "Meaning ⎊ Realized volatility measures provide the empirical foundation for quantifying historical price dispersion to inform robust derivative risk management. ⎊ Definition", "datePublished": "2026-03-11T23:22:46+00:00", "dateModified": "2026-03-11T23:23:57+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-financial-derivatives-liquidity-funnel-representing-volatility-surface-and-implied-volatility-dynamics.jpg", "width": 3850, "height": 2166, "caption": "This abstract visual composition features smooth, flowing forms in deep blue tones, contrasted by a prominent, bright green segment. The design conceptually models the intricate mechanics of financial derivatives and structured products in a modern DeFi ecosystem." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/multi-layer-solvency-engines/", "url": "https://term.greeks.live/term/multi-layer-solvency-engines/", "headline": "Multi Layer Solvency Engines", "description": "Meaning ⎊ Multi Layer Solvency Engines provide automated, tiered risk management to maintain protocol stability during extreme decentralized market volatility. ⎊ Definition", "datePublished": "2026-03-11T18:19:59+00:00", "dateModified": "2026-03-11T18:20:28+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/nested-modular-architecture-of-a-defi-protocol-stack-visualizing-composability-across-layer-1-and-layer-2-solutions.jpg", "width": 3850, "height": 2166, "caption": "The image displays concentric layers of varying colors and sizes, resembling a cross-section of nested tubes, with a vibrant green core surrounded by blue and beige rings. This structure serves as a conceptual model for a modular blockchain ecosystem, illustrating how different components of a decentralized finance DeFi stack interact." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/risk-sensitivity-measures/", "url": "https://term.greeks.live/term/risk-sensitivity-measures/", "headline": "Risk Sensitivity Measures", "description": "Meaning ⎊ Risk sensitivity measures provide the essential quantitative framework for navigating the non-linear risks inherent in decentralized derivative markets. ⎊ Definition", "datePublished": "2026-03-11T12:00:34+00:00", "dateModified": "2026-03-11T12:00:51+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/risk-decomposition-and-layered-tranches-in-options-trading-and-complex-financial-derivatives.jpg", "width": 3850, "height": 2166, "caption": "A high-resolution cross-section displays a cylindrical form with concentric layers in dark blue, light blue, green, and cream hues. A central, broad structural element in a cream color slices through the layers, revealing the inner mechanics." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/blockchain-settlement-layer/", "url": "https://term.greeks.live/term/blockchain-settlement-layer/", "headline": "Blockchain Settlement Layer", "description": "Meaning ⎊ The Blockchain Settlement Layer provides the immutable infrastructure for programmatic collateral management and near-instant finality in derivatives. ⎊ Definition", "datePublished": "2026-03-11T02:22:58+00:00", "dateModified": "2026-03-11T02:24:20+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/visualizing-multi-asset-collateralization-in-structured-finance-derivatives-and-yield-generation.jpg", "width": 3850, "height": 2166, "caption": "This abstract composition features layered cylindrical forms rendered in dark blue, cream, and bright green, arranged concentrically to suggest a cross-sectional view of a structured mechanism. The central bright green element extends outward in a conical shape, creating a focal point against the dark background." } }, { "@type": "Article", "@id": "https://term.greeks.live/term/settlement-layer-failure/", "url": "https://term.greeks.live/term/settlement-layer-failure/", "headline": "Settlement Layer Failure", "description": "Meaning ⎊ Settlement layer failure represents the critical, system-wide breakdown of transaction finality that threatens the integrity of derivative markets. ⎊ Definition", "datePublished": "2026-03-11T01:48:04+00:00", "dateModified": "2026-03-11T01:48:51+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/interoperable-layer-two-scaling-solutions-architecture-for-cross-chain-collateralized-debt-positions.jpg", "width": 3850, "height": 2166, "caption": "The image displays a complex mechanical component featuring a layered concentric design in dark blue, cream, and vibrant green. The central green element resembles a threaded core, surrounded by progressively larger rings and an angular, faceted outer shell." } } ], "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" } } ``` --- **Original URL:** https://term.greeks.live/area/layer-two-security-measures/