Throughput
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Key Takeaway
Throughput in blockchain refers to the number of transactions a network can process per second (TPS), with Bitcoin's base layer handling approximately 5-7 TPS due to its 10-minute block time and block size limits, deliberately trading speed for security and decentralization.
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What Is Throughput?
Throughput in blockchain refers to the number of transactions a network can process per second (TPS), with Bitcoin's base layer handling approximately 5-7 TPS due to its 10-minute block time and block size limits, deliberately trading speed for security and decentralization.
How Throughput Works
Frequently Asked Questions
Why doesn't Bitcoin just increase block size or speed to improve throughput?
Bitcoin could theoretically increase throughput by making blocks larger or faster, but both changes would compromise decentralization and security—Bitcoin's core value propositions. Larger blocks require more bandwidth to download and more storage space, making it harder for regular users to run full nodes. This would centralize the network, as only well-resourced entities could participate in verification, defeating Bitcoin's purpose as a decentralized money system. Faster blocks create more orphaned blocks (valid blocks that don't make the main chain) and favor miners with faster internet connections, also promoting centralization. Bitcoin Cash tried increasing block size to 32MB but remains far less decentralized and secure than Bitcoin. The Bitcoin community decided that maintaining decentralization through limited block size is more important than maximizing base-layer throughput. Instead, the solution is building higher-throughput layers like Lightning Network on top of Bitcoin's secure foundation—similar to how visa processes transactions with eventual settlement on slower banking infrastructure.
How does Bitcoin's throughput compare to other payment systems and blockchains?
Bitcoin's approximately 5-7 TPS is low compared to both traditional systems and newer blockchains. Visa claims capability of 65,000 TPS (though average usage is much lower), PayPal handles around 200 TPS, and even Ethereum manages 15-30 TPS. Newer blockchains like Solana target 50,000+ TPS, though they make different tradeoffs in decentralization and security. However, comparing base-layer throughput isn't quite fair because Bitcoin doesn't aim to replace Visa directly—it's designed as a settlement layer. When including Lightning Network (Bitcoin's second layer), Bitcoin's effective throughput becomes theoretically unlimited since Lightning handles thousands of TPS off-chain with instant finality. A better comparison is to central banking systems: Fedwire handles about 30 TPS, SWIFT processes even fewer. Bitcoin's strategy matches this: secure, slow base layer for final settlement; fast second layer for everyday transactions. Raw TPS numbers don't tell the whole story when security and decentralization matter.
Will Bitcoin's limited throughput prevent it from achieving mass adoption?
Limited base-layer throughput won't prevent Bitcoin adoption because Bitcoin uses a layered architecture where the base layer doesn't need to handle every transaction. Think of it like the internet: the TCP/IP base layer is relatively slow and simple, but we built HTTP, video streaming, and countless applications on top. Similarly, Bitcoin's base layer provides security and final settlement, while second-layer solutions like Lightning Network handle high-volume, everyday transactions. Lightning can process thousands of TPS with instant finality and minimal fees—perfect for daily purchases. As adoption grows, more economic activity moves to second layers while the base layer secures the system through periodic settlements. El Salvador, where Bitcoin is legal tender, handles most transactions through Lightning, not on-chain. The layered approach means Bitcoin can scale to billions of users without changing its base layer security or decentralization. If anything, limited throughput strengthens Bitcoin by ensuring it remains decentralized enough that no single entity can control or censor it.
Common Misconceptions About Throughput
Bitcoin's low throughput means it's outdated and will be replaced by faster blockchain
Bitcoin's low base-layer throughput is a deliberate design choice, not a technical limitation that couldn't be fixed. Bitcoin prioritizes security and decentralization over raw transaction speed because these properties make it valuable as money and a settlement layer—purposes for which speed alone matters less than certainty and resistance to control. Blockchains claiming dramatically higher throughput typically achieve it by sacrificing decentralization (fewer nodes can participate due to higher resource requirements) or security (faster blocks, less time to propagate and verify). Bitcoin's approach is building layers: keep the base layer secure and decentralized, then add high-speed layers like Lightning Network on top. This architectural pattern has proven successful in many technologies—the internet's base protocols are slow but reliable, with speed coming from higher layers. Newer 'faster' blockchains haven't replaced Bitcoin any more than newer payment processors replaced gold as a store of value. Different systems serve different purposes.
Bitcoin can never handle global adoption with only 5-7 transactions per second
This misconception misunderstands how Bitcoin scaling works. The 5-7 TPS figure applies only to Bitcoin's base layer, but Bitcoin doesn't need to handle every transaction on-chain. Lightning Network, built on top of Bitcoin, processes thousands of transactions per second off-chain with instant finality, settling final amounts on Bitcoin's blockchain periodically. Think of it like banks: they don't settle every customer transaction individually with the Federal Reserve—they batch transactions and settle net amounts once or twice daily. Similarly, Lightning users can make unlimited transactions in payment channels, touching the base layer only when opening, closing, or rebalancing channels. This means Bitcoin can theoretically support billions of users: most transactions happen on Lightning, while the blockchain secures the system and records major settlements. El Salvador demonstrates this—despite being Bitcoin legal tender, most transactions use Lightning, not on-chain Bitcoin. The architecture scales by moving high-frequency, low-value activity to upper layers while reserving base-layer capacity for high-value settlements and security.
Higher throughput always makes a blockchain better
Higher throughput comes with tradeoffs that can make a blockchain worse for certain purposes. Increasing throughput usually requires larger blocks (more data) or faster block production, both of which make running a full node harder. When running a node requires expensive hardware and internet connections, fewer people can participate in verifying transactions, leading to centralization. A centralized blockchain defeats the purpose of blockchain technology—you might as well use a traditional database controlled by a company, which would be even faster. Bitcoin's moderate throughput ensures ordinary users can run nodes on modest hardware, maintaining decentralization. For applications requiring trust minimization and censorship resistance (like sovereign money), Bitcoin's approach is superior to high-throughput chains that compromise these properties. Different applications need different tradeoffs: DeFi platforms might prioritize throughput over decentralization, while Bitcoin prioritizes security and decentralization over speed. Neither is objectively 'better'—it depends on the use case. For sound money, Bitcoin's tradeoffs are appropriate.