What is Solana?

Our Proof of HistoryProof of HistoryProof of History is a cryptographic timekeeping method used by Solana to order transactions efficiently before they are processed by the network.Keep learning article introduced Solana specifically through the lens of its distinctive consensusBlockchain consensus mechanismsA consensus mechanism is a method for validating transactions and securing a blockchain without relying on a central authority.Keep learning innovation; but Proof of History is only one piece of a broader, deliberately throughput-obsessed architecture. With BitcoinBitcoinBitcoin is a decentralized digital currency that enables secure peer-to-peer transactions without relying on a central authority.Keep learning and EthereumEthereumEthereum is a decentralized blockchain platform that runs smart contracts and dApps, using its native cryptocurrency (ETH) for transactions and fees.Keep learning now covered in full as this series' two flagship networks, it's worth giving Solana its own dedicated treatment: a networkBlockchain NetworkA blockchain network is a system of computers connected to each other that follow the same set of rules to record, share, and validate transactions.Keep learning built, from its very first design decisions, around a single overriding priority that sets it apart from almost everything else covered in this series; raw speed, at a scale the other networks discussed so far were never designed to match.

Origins: A Different Starting Point

Solana was founded by Anatoly Yakovenko, a former Qualcomm engineer, who published the project's foundational whitepaperWhitepaperA whitepaper is a detailed document that explains a project’s concept, technology, goals, and how it plans to work or solve a problem.Keep learning in 2017 before the network's mainnet beta launched in March 2020. Yakovenko's background is worth noting directly, since it shaped Solana's entire design philosophy: rather than approaching blockchainBlockchainThink of blockchain as a public notebook that everyone owns a copy of. Whatever gets written in it is permanent and visible to all.Keep learning architecture primarily from a cryptographyCryptographyCryptography is the science of securing information using mathematical techniques to protect data, ensure privacy, and verify authenticity.Keep learning or distributed-systems research background, as much of the rest of the industry had, Yakovenko's prior work in telecommunications networking; systems that, by necessity, already had to handle synchronizing timing and ordering across distributed hardware at enormous scale; directly informed Proof of History's core insight, discussed at length in our earlier article: that establishing a verifiable, trustless sense of time and ordering could be solved separately from, and prior to, the broader question of consensus itself.

The original Solana whitepaper is available directly at solana.com/solana-whitepaper.pdf, and is worth reading specifically for how directly it frames the project's central thesis: that most blockchain scalabilityScalabilityScalability is the ability of a blockchain or system to handle increasing numbers of transactions or users efficiently without performance loss.Keep learning bottlenecks, up to that point, stemmed from networks treating time and ordering as something requiring expensive, repeated communication to establish, rather than as something that could be made cryptographically self-evident.

Beyond Proof of History: The Full Architecture

While Proof of History remains Solana's signature innovation, it's only one of several deliberately interlocking technical components, each addressing a different specific bottleneck in the transaction lifecycle, working together to produce the network's overall throughput.

Tower BFT, introduced in our Proof of History article, is Solana's customized Proof of StakeProof of StakeProof of Stake is a consensus method where validators stake tokens to secure the network and earn rewards for validating transactions.Keep learning consensus mechanism, built specifically to take advantage of Proof of History's pre-established ordering to reach agreement faster than a conventional BFT-style mechanism (of the kind discussed in our consensus mechanisms article) could achieve on its own.

Gulf Stream addresses transaction forwarding; rather than waiting for a leader validator to be selected before transactions can even begin propagating across the network, Gulf Stream forwards transactions to upcoming validators in advance, based on Solana's known, scheduled leader rotation, reducing the time transactions spend simply waiting in a queue before processing even begins.

Sealevel is Solana's parallel smart contractSmart ContractsA smart contract is a self-executing computer program deployed on a blockchain. It contains rules and conditions written directly into code.Keep learning execution engine; and represents a genuinely significant departure from the EVMEthereum Virtual Machine (EVM)EVM (Ethereum Virtual Machine) is the software environment that executes smart contracts and decentralized applications on compatible blockchains.Keep learning's execution model, discussed at length in our previous Ethereum article. Where the EVM processes transactions sequentially, one after another, Sealevel is specifically designed to recognize when multiple transactions don't actually depend on or conflict with each other's data, and execute those non-overlapping transactions simultaneously, across multiple processor cores at once, rather than strictly one at a time.

Cloudbreak is Solana's data structure for account storage, designed specifically to support the kind of fast, simultaneous read and write access that Sealevel's parallel execution model requires to actually function as intended at scale.

Taken together, this isn't simply "Bitcoin or Ethereum, but faster"; it's a meaningfully different set of architectural choices throughout the entire transaction pipeline, each specifically targeting a bottleneck that a sequential, single-threaded design (of the kind underlying the EVM, as our Ethereum article explored) would otherwise encounter.

SOL: Tokenomics and Network Fees

Solana's native currency, SOL, serves a broadly similar dual role to Ethereum's Ether; both a tradeable currency and the asset used to pay transaction feesTransaction feesTransaction fees are charges paid to process and validate transactions on a blockchain network.Keep learning and to stake for network securityBlockchain SecurityBlockchain security is the protection of blockchain networks and assets against attacks, fraud, and vulnerabilities using cryptography and consensus mechanisms.Keep learning under the Tower BFT mechanism described above. Unlike Bitcoin's fixed cap, and similarly to Ethereum's post-Merge model, SOL has no hard maximum supply, instead following a disinflationary issuance schedule that gradually reduces the annual rate of new SOL creation over time, alongside a partial fee-burning mechanism broadly comparable in spirit, though not identical in mechanics, to Ethereum's EIP-1559 discussed in our previous article.

One of Solana's most frequently cited practical characteristics is its transaction cost: fees on Solana are typically a small fraction of a cent, dramatically lower than typical Ethereum base-layerLayer 1 BlockchainLayer 1 blockchain is the base network of a blockchain system that processes transactions and provides security without relying on another chain.Keep learning gasGas FeesGas fees are transaction costs paid to network validators to process and secure operations on a blockchain, varying with demand and complexity.Keep learning costs during periods of network congestion, discussed in our EVM article; a direct, deliberate consequence of the network's overall throughput-focused design.

Network Performance and Real-World Activity

Solana's headline throughput figures; commonly cited in the tens of thousands of transactions per second under optimal, real-world conditions; sit in a different category entirely from the figures discussed for Bitcoin (roughly 7 transactions per second) and Ethereum's base layer in our earlier articles. This throughput has, in practice, made Solana a particularly popular network for use cases that are genuinely sensitive to transaction speed and cost: decentralized exchangesDEXs (Decentralized Exchanges)DEXs are decentralized exchanges that let users trade cryptocurrencies directly from their wallets using smart contracts, without a central authority.Keep learning relying on rapid order matching, certain categories of NFTNFTsAn NFT is a unique digital asset stored on a blockchain that proves ownership of something.Keep learning minting and trading, and a substantial portion of the broader memecoin and high-frequency retail trading activity that has become a notable feature of the Solana ecosystem specifically.

You can observe this real-time activity directly using the tools introduced in our Proof of History article; the Solana Explorer, Solana Beach, and Solscan; alongside DeFiLlama's Solana dashboard, which tracks the total value locked across Solana's DeFiDeFiDeFi stands for Decentralized Finance. It refers to a collection of applications and platforms built on blockchain that allow people to transact without banks.Keep learning ecosystem specifically, offering a useful, direct way to compare the scale of Solana's DeFi activity against Ethereum's, given the relative figures referenced in our previous article.

Network Outages: A Recurring Point of Scrutiny

Our Proof of History article noted, briefly, that Solana has experienced several high-profile network outages since launch; a point worth expanding on directly here, since it remains one of the most frequently raised criticisms of the network, and a genuinely instructive real-world illustration of the Blockchain TrilemmaThe Blockchain TrilemmaThe blockchain trilemma is the challenge of balancing decentralization, security, and scalability in blockchain systems, where improving one impacts the others.Keep learning discussed earlier in this series.

These outages have generally stemmed from the network's validators being overwhelmed during periods of unusually intense transaction demand; at various points triggered by surges in NFT minting activity, bot-driven trading, or other sudden spikes in transaction volume that exceeded what the network's validator infrastructure could process and propagate reliably at that time. Each incident has prompted specific protocolBlockchain ProtocolA blockchain protocol is the set of rules and standards that govern how a blockchain network operates, validates transactions, and reaches consensus.Keep learning improvements; including the introduction of dedicated fee markets and prioritization mechanisms specifically designed to better manage demand spikes; and the network's uptime track record has measurably improved over time as these changes have been implemented, though the historical pattern remains a point that critics reasonably continue to raise when comparing Solana's reliability against the longer, less interrupted track records of Bitcoin and Ethereum discussed in the previous two articles.

This is worth connecting directly back to the trilemma framework: Solana's architecture has made a deliberate, explicit trade-off favoring scalability, and its outage history is a genuine, observable real-world consequence of that trade-off, rather than a simple engineering oversight unrelated to its core design priorities.

Validator Requirements and Decentralization

Our Proof of History article also touched briefly on Solana's comparatively steeper hardware requirements for running a competitive validator, a direct consequence of the sheer computational throughput Sealevel and Proof of History both demand from participating hardware. This has resulted in a validator set that, while substantial and genuinely globally distributed, generally requires more significant, more specialized hardware investment than running an Ethereum validator (discussed in our Proof of Stake article) or a Bitcoin full node (discussed in our blockchain nodesBlockchain NodesA node is simply a computer that participates in a blockchain network. Each node stores a copy of the blockchain and helps verify transactions.Keep learning article); a real, measurable difference in the decentralizationDecentralizationDecentralization is the distribution of control and decision-making across a network instead of a single central authority.Keep learning-versus-performance trade-off across these three major networks, and one worth weighing directly against the throughput advantages described above, rather than viewing either side of that trade-off in isolation.

Bringing It Together

Solana represents a genuinely distinct point along the Blockchain Trilemma explored earlier in this series; a network built, from the ground up, around a deliberate, explicit bet that meaningfully greater throughput and lower fees were worth pursuing aggressively, even at some real cost to validator accessibility and short-term network reliability. To summarize:

• Solana was founded by Anatoly Yakovenko, building directly on Proof of History; the verifiable time-ordering innovation covered in our previous dedicated article
• Beyond Proof of History, Solana's architecture includes Tower BFT, Gulf Stream, Sealevel, and Cloudbreak, each targeting a specific bottleneck in the transaction pipeline
• SOL functions similarly to Ether; currency, stakingStakingCrypto staking is the process of locking up cryptocurrency to support a blockchain network and earn rewards in return.Keep learning asset, and fee tokenCrypto TokensCrypto tokens are digital assets built on existing blockchains that represent value, access, or utility within a specific project or ecosystem.Keep learning; with a disinflationary, uncapped issuance schedule
• Solana's throughput and low fees have made it especially popular for high-frequency trading, NFT activity, and memecoin trading specifically
• The network's history of outages represents a genuine, observable real-world consequence of its deliberate scalability-focused trade-offs, directly illustrating the Blockchain Trilemma in practice
• Solana's validator hardware requirements are meaningfully steeper than Ethereum's or Bitcoin's, reflecting the same underlying trade-off

With Bitcoin, Ethereum, and now Solana all covered in depth, this series has examined three genuinely different, well-reasoned answers to the same underlying set of trade-offs first introduced in our Blockchain Trilemma article; each network making a different, deliberate bet about where, exactly, to prioritize decentralization, security, and scalability, and each attracting the specific use cases best suited to the particular bet it made.