What Is Solana (SOL) and How The Ultra-Fast Cryptocurrency Works?

Solana is a proof-of-stake layer 1 blockchain built for speed. It is designed to finalize transactions in a fraction of a second, charges a base fee of 0.000005 SOL per signature, and runs smart contracts for DeFi, stablecoin payments, NFTs and token trading. SOL is its native token, used to pay fees, secure the network through staking and vote on protocol changes.

If you learned how Solana works before October 2026, part of that picture is now out of date. On October 21, 2026, the network switched its consensus to Alpenglow. The upgrade retired TowerBFT, the voting system Solana had used since 2020, and ended Proof of History’s job as the clock that paces block production. It targets finality of roughly 150 milliseconds, down from about 12.8 seconds, although mainnet has not shown that number consistently yet.

This guide explains how Solana works today, what changed and why, where the speed claims hold up, how SOL’s supply and staking work, and which risks deserve your attention before you buy. Every time-sensitive figure carries a date, because on a network that changes this quickly, an undated number is a liability.

Editorial note: this guide is educational and is not financial advice. Visualmodo has no commercial relationship with the Solana Foundation or any exchange, wallet or project mentioned here. Figures were last checked on October 24, 2026 against Solana Foundation documentation and public network data.

Solana at a Glance (October 2026)

If you only need the short answer to “What is Solana?”, the table below covers the facts people search for most. Each one is explained in detail further down.

Fact	Detail
Type	Layer 1 smart contract blockchain
Native token	SOL (1 SOL = 1 billion lamports)
Created by	Anatoly Yakovenko, a former Qualcomm engineer, with co-founder Raj Gokal; whitepaper published in 2017
Mainnet launch	March 2020 (mainnet beta)
Consensus	Proof of stake; Alpenglow (Votor) since October 21, 2026, replacing TowerBFT
Finality	Target of about 150 milliseconds (previously about 12.8 seconds); about 6.6 seconds on the Solana Foundation’s dashboard on activation day
Slot time	200 milliseconds since October 2026 (previously 400 milliseconds)
Base transaction fee	5,000 lamports (0.000005 SOL) per signature, half of it burned
Supply	No hard cap; inflation was about 3.8% in mid-2026 and declines toward 1.5%
Share of supply staked	About 69% (end of Q3 2026)
Voting validators	Roughly 650 to 680 (October 2026)
Last full network halt	February 6, 2024

What Is Solana?

Solana is a public, permissionless blockchain that anyone can use to send tokens or run programs, which is what Solana calls its smart contracts. Like Ethereum, it is a general-purpose platform for decentralized applications. The difference is the design priority: Solana tries to process a very large volume of transactions on one shared chain, quickly and cheaply, instead of moving most activity to separate layer 2 networks.

The project began with Anatoly Yakovenko, a former Qualcomm engineer who published a whitepaper in 2017 describing Proof of History, a way to timestamp events on a blockchain without waiting for nodes to agree on the time. He co-founded Solana Labs with Raj Gokal, and after private funding rounds and a public token auction, Solana’s mainnet beta went live in March 2020.

Development is no longer concentrated in one company. Anza, a team spun out of Solana Labs in 2024, maintains the Agave validator client. Jump Crypto builds Firedancer, an independent client written from scratch. The Solana Foundation, a Swiss non-profit, funds ecosystem work and coordinates network upgrades. Programs are usually written in Rust and run on the Solana Virtual Machine (SVM), an execution environment that other networks have started to reuse.

Why Solana Was Built: Speed and the Blockchain Trilemma

Ethereum co-founder Vitalik Buterin popularized the idea of the blockchain trilemma: a network struggles to be decentralized, secure and scalable all at once, and improving one property usually costs another. Most blockchains respond by keeping the base layer modest and scaling elsewhere. Ethereum, for example, now pushes most everyday activity to rollups that settle back to the main chain.

Solana made the opposite bet. It scales the base layer itself by asking validators to run powerful, well-connected hardware and by executing transactions in parallel. The result is one fast, shared state where every app can interact with every other app without bridges. The cost is that running a validator is expensive, which limits how many independent operators can take part.

That trade-off is not hidden in the fine print. It is the core of the design, and you will see its consequences in the risks section below.

How Does Solana Work?

The honest answer to how Solana works is that several components share the job, each one removing a specific bottleneck. Here is what each does, including the parts that changed in October 2026.

Validators, Staking and the Leader Schedule

Validators are computers running Solana client software. They hold staked SOL, process transactions and vote on which blocks are valid. SOL holders who don’t run hardware can delegate their tokens to a validator and share in its rewards. That is the essence of proof of stake: influence over the network is proportional to the SOL staked behind each validator.

Solana divides time into short slots grouped into epochs. Before each epoch, the network publishes a leader schedule, weighted by stake, that assigns each slot to a validator. Because everyone knows in advance who will produce the next blocks, transactions can be sent straight to the upcoming leader instead of waiting in a shared pool.

Proof of History: Solana’s Original Clock

Proof of History (PoH) is a chain of SHA-256 hashes computed one after another, where each output becomes the input for the next step. Because every step depends on the one before it, the chain cannot be computed in parallel, so its length proves that real time has passed. Leaders recorded transactions inside this sequence, which gave every validator the same order and a trustworthy timestamp without first having to exchange messages.

Two clarifications fix common errors in older Solana explainers. PoH was never a consensus mechanism on its own; it was a clock that made consensus faster. And SHA-256 is a public, standardized hash function, the same one Bitcoin uses for mining, not a proprietary algorithm.

Since the Alpenglow upgrade, Solana’s Proof of History no longer paces block production. The concept still explains much of the network’s architecture, which is why so many guides continue to describe Solana as “proof of history plus proof of stake.”

TowerBFT: How Blocks Were Finalized Until October 2026

From 2020 until October 21, 2026, Solana reached agreement with TowerBFT, a variant of practical Byzantine fault tolerance that used PoH as its clock. Validators voted by submitting vote transactions to the chain, and each vote locked them in for longer. A block counted as finalized once enough votes had stacked up over 32 slots, which took about 12.8 seconds.

This worked, but it was costly. Vote transactions filled a large share of every block, and each validator paid roughly 1 SOL per epoch in voting fees.

Alpenglow: The October 2026 Consensus Upgrade

Solana’s Alpenglow upgrade is the biggest change to the network’s core protocol since launch. Its first phase, Votor, activated on mainnet at the start of epoch 1064 on October 21, 2026, after testnet and devnet migrations in September. According to the Solana Foundation’s Alpenglow upgrade page, the handoff from TowerBFT took about 900 milliseconds, with 446 of the network’s 654 validators signing the first Alpenglow certificate. Validators had approved the upgrade in a governance vote in September 2025, with about 98% support.

Under Votor, validators send votes directly to each other rather than posting them as transactions, then combine those votes into certificates. If at least 80% of stake votes for a block in the first round, the block is final immediately. If not, a second round with 60% thresholds decides whether the block is finalized or skipped. The protocol is designed to keep working with up to 20% of stake acting maliciously plus another 20% offline.

Treat 150 milliseconds as the goal, not today’s reality. On activation day, the Solana Foundation’s own Alpenglow dashboard showed finality of about 6.6 seconds, already about half the old figure but well above the target. Independent, sustained measurements of mainnet finality don’t exist yet.

Here is what the upgrade changes in practice:

• Finality targets about 150 milliseconds, down from about 12.8 seconds. The Solana Foundation describes 150 milliseconds as an expectation rather than a guarantee.
• Vote transactions no longer appear in blocks, which frees block space.
• Proof of History no longer paces block production. Votor’s timeouts and certificates do, and PoH tick entries left the ledger.
• The confirmed and finalized commitment levels now describe the same state, so apps can wait for full finality without a separate, slower step.
• Voting fees were replaced by a flat Validator Admission Ticket of 0.8 SOL per epoch, which is burned.

What did not change matters just as much. Transaction formats, programs, fees and the SVM are untouched, so wallets and apps work as before and ordinary users need to do nothing. A second phase, Rotor, will later replace Turbine, the system that spreads block data across the network, but it has no scheduled date yet.

Feature	TowerBFT (2020 to October 2026)	Alpenglow (since October 21, 2026)
How validators vote	On-chain vote transactions	Direct messages combined into certificates
Time to finality	About 12.8 seconds	Target of about 150 milliseconds; about 6.6 seconds measured on day one
Role of Proof of History	Paced block production	No longer paces blocks
Validator voting cost	About 1 SOL per epoch in fees	0.8 SOL per epoch admission fee, burned
Fault tolerance	Less than one third of stake faulty	Up to 20% malicious plus 20% offline
Block data propagation	Turbine	Turbine for now; Rotor planned

Sealevel, Gulf Stream and Turbine

Three older components still do much of the heavy lifting:

• Sealevel is Solana’s parallel runtime. Every transaction declares upfront which accounts it will read and write, so transactions that don’t touch the same accounts can run at the same time across many CPU cores. This also creates local fee markets: a rush on one popular token raises priority fees mainly for transactions touching that token, not for the whole network.
• Gulf Stream removes the global mempool. Because the leader schedule is known in advance, transactions are forwarded straight to upcoming leaders.
• Turbine breaks each block into small, erasure-coded pieces called shreds and relays them through layers of validators, so no single node has to upload a whole block to everyone.

How Fast Is Solana Really?

Speed claims about Solana mix up three different measurements, so it helps to separate them:

• Throughput (TPS): how many transactions the network processes per second.
• Slot time: how often a leader gets a turn to produce a block. Solana cut slot times from 400 to 200 milliseconds in stages that finished in October 2026.
• Finality: how long until a transaction can’t be reversed. Solana finality now targets about 150 milliseconds under Alpenglow, but the Foundation’s dashboard showed about 6.6 seconds on activation day, so real-world numbers are still settling.

The large Solana TPS numbers you see quoted are ceilings, not daily reality. The 710,000 TPS figure came from theoretical math in the original whitepaper, 65,000 TPS is a commonly cited capacity figure, and Firedancer has passed 1 million TPS in lab demonstrations. On mainnet, real activity runs at a few thousand transactions per second; the Foundation’s Alpenglow dashboard showed about 4,700 on activation day. Demand and per-block compute limits set the pace, not the theoretical ceiling.

One 2026 detail trips up comparisons. Since Alpenglow removed vote transactions from blocks, dashboards that used to count votes now show much lower TPS without any drop in real activity. Compare like with like.

You don’t have to take anyone’s word for these numbers, including ours. Solana’s official status page reports outages and degraded performance, the Solana Foundation publishes a live Alpenglow dashboard with finality and throughput, and block explorers such as Solana Explorer show individual transactions and their confirmation status.

For builders, the chain is rarely the first thing to break. During a busy launch, rate-limited RPC endpoints usually fail before Solana does, which is why our guide to Web3 hosting for dApps recommends running two RPC providers with failover and planning indexing early.

The SOL Token: Fees, Supply and Inflation

The SOL token is the network’s native currency. You need it to:

• Pay transaction fees.
• Stake with validators to secure the network and earn rewards.
• Fund the small rent-exempt deposit every account must hold to store data on chain.
• Take part in governance. Stake-weighted votes now decide economic changes, such as the inflation vote in August 2026.

How Solana Transaction Fees Work

Solana transaction fees have two parts. The base fee is 5,000 lamports per signature, which is 0.000005 SOL; half is burned and half goes to the validator that processes the transaction. An optional priority fee, priced per compute unit, helps a transaction get scheduled faster during congestion and goes entirely to the validator. Fees are charged even if a transaction fails, which matters when bots crowd busy markets.

SOL Supply and Distribution

SOL has no maximum supply. At genesis in 2020, about 500 million SOL were created and split roughly like this: about 39% to a community reserve managed by the Solana Foundation, about 13% to the founding team, about 10% to the foundation itself, and around 38% to seed, founding, validator and strategic sales. A public auction on CoinList sold 8 million SOL at $0.22 in March 2020. The team and private investors together received close to half of the initial supply.

Inflation and the 2026 Disinflation Vote

New SOL is issued every epoch as staking rewards. Inflation started at 8% a year and falls by 15% annually until it reaches a long-term floor of 1.5%. It stood at about 3.8% in mid-2026.

In a stake-weighted governance vote that closed on August 28, 2026, proposal SIMD-0550 passed with about 67% of participating stake, just over the two-thirds threshold. It doubles the disinflation rate to 30% a year, which would bring inflation to the 1.5% floor around 2029 instead of 2032. At the time of writing, the change was approved but still waiting for activation through a client release and feature gate, so the old schedule remains in force until then.

Fee burning offsets only a small part of issuance, so SOL remains net inflationary. If you hold SOL without staking it, your share of the network shrinks a little every year.

How Solana Staking Works

Solana staking lets you delegate SOL to a validator without giving up custody. Your tokens stay in a stake account you control, the validator does the work, and you receive rewards minus the validator’s commission. Stake activates and deactivates at epoch boundaries, so unstaking is not instant.

Staking is popular. About 69% of SOL’s supply was staked at the end of the third quarter of 2026, according to Bitwise’s Q4 2026 staking report, at a gross yield of about 6%. That yield is falling as inflation declines, and it will fall faster once SIMD-0550 activates.

When choosing a validator, look at commission, uptime and whether it already holds a very large share of stake. Delegating to smaller, well-run validators helps the network’s decentralization. Liquid staking tokens, such as JitoSOL, give you a tradable token that represents staked SOL and can be used in DeFi, but they add smart contract risk.

Traditional investors now have another route. Spot Solana ETFs began trading in the United States in late October 2025, and some of them stake their holdings. These funds drew more than $1 billion in net inflows in their first year.

What Is Solana Used For?

Low fees and fast finality make Solana a natural fit for activity that involves many small transactions:

• Decentralized finance: exchanges, aggregators, lending markets and perpetual futures. If DeFi is new to you, start with our explainer on decentralized finance.
• Stablecoins and payments: USDC and USDT are issued natively on Solana, transfers cost a fraction of a cent, and Solana Pay lets merchants accept them directly. Faster finality makes point-of-sale use more realistic.
• NFTs and digital collectibles: cheap minting, including compressed NFTs that store data efficiently.
• Token launches and memecoins: Solana has become one of the busiest places to launch new tokens, which brings both liquidity and a lot of scams.
• Tokenized assets: tokenized stocks, treasuries and other real-world assets that trade around the clock.
• DePIN: physical infrastructure networks such as Helium (wireless) and Hivemapper (mapping) that reward contributors in tokens.

If you run an online business, stablecoin acceptance is often the most practical entry point. Network choice affects fees, wallet support and how easily your team can reconcile payments, and our comparison of USDT on TRC20 vs ERC20 walks through the same trade-offs you would weigh before adding Solana as another option.

Solana vs Ethereum in 2026

Many older Solana vs Ethereum comparisons pit Solana against Ethereum’s proof-of-work chain and its roughly 15 transactions per second. That comparison is obsolete. Ethereum switched to proof of stake in September 2022, cutting its energy use by more than 99%, and now scales mostly through layer 2 rollups.

The real difference today is philosophy. Solana keeps activity on one fast base layer; Ethereum keeps its base layer conservative and lets rollups handle most transactions.

Feature	Solana	Ethereum
Consensus	Proof of stake with Alpenglow (Votor)	Proof of stake (Gasper)
Slot time	200 milliseconds	12 seconds
Base-layer finality	Target of about 150 milliseconds	About 13 minutes
Scaling approach	Scale the base layer	Layer 2 rollups that settle to layer 1
Base-layer fees	Fractions of a cent for simple transfers	Variable and higher at busy times; rollups are cheaper
Share of supply staked (Q3 2026)	About 69%	About 36%
Gross staking yield (Q3 2026)	About 6%	About 2.6%
Main smart contract language	Rust	Solidity
Validator hardware	High-end servers with high bandwidth	Modest; home staking is common

Solana co-founder Anatoly Yakovenko has himself pushed back on the old “Ethereum killer” label, arguing that the two networks can compete and coexist. For most people, the choice comes down to where the apps, liquidity and tools they want already live.

Solana’s Risks and Weaknesses

Solana’s performance is real, and so are its weak points. These are the ones worth understanding before you commit money or build on it.

Outages and Near Misses

Solana outages were frequent in the network’s early years. It halted completely about seven times between late 2020 and February 2024, according to Helius’s history of Solana outages, the longest for roughly 17 hours in September 2021. The last full outage, on February 6, 2024, stopped block production for about five hours. Since then the network has kept producing blocks, but not without scares. On August 12, 2026, a routing failure at a single hosting provider took validators holding nearly 29% of stake offline for about 33 minutes, within a few percentage points of the level that would have stalled consensus.

Shrinking Validator Set and Stake Concentration

Solana validators are getting fewer. Solana Compass data shows validators with active stake fell from 958 in October 2025 to 678 by the end of September 2026, as rising costs pushed smaller operators out. The Nakamoto coefficient, the smallest number of validators that together control more than a third of stake, sat at 18 in October 2026. A large share of stake also runs in a handful of data centers, which the August incident exposed.

Client Diversity Took a Step Back

A healthy network runs several independent client implementations, so one bug cannot take everything down. Firedancer had grown to roughly 11% of stake by August 2026, but neither Firedancer nor its hybrid sibling Frankendancer was supported for the Alpenglow migration, so their operators had to switch to Agave-based clients. For now, most stake runs on Agave and its forks such as Jito-Solana, and Firedancer’s return is a key metric to watch.

New Protocol, Short Track Record

When this guide was last updated on October 24, 2026, Alpenglow had been live on mainnet for three days. It went through months of testing and a bug bounty, but the 150 millisecond finality target still has to prove itself under real load, and the Rotor phase is still ahead.

Token Concentration and Price Volatility

Insiders received close to half of SOL’s initial supply, and the token’s history shows how quickly sentiment can turn. After crypto exchange FTX, one of Solana’s largest backers, collapsed in November 2022, SOL fell to about $8, roughly 97% below its 2021 peak. It later recovered to an all-time high near $293 in January 2025 before falling sharply again. Expect large swings.

Scams, Memecoins and Fake Volume

Cheap token creation means anyone can launch a coin in minutes. Rug pulls, copycat tokens and artificially inflated trading volume are common, so treat unfamiliar tokens with suspicion even when their charts look busy.

How to Buy, Store and Stake SOL Safely

If you’re working out how to buy Solana for the first time, the steps are simple. Doing them safely takes a little more care:

1. Use a regulated exchange licensed where you live. Check its fees, withdrawal options and whether it publishes proof of reserves. FTX’s collapse is the reminder that coins held on an exchange are only as safe as the exchange.
2. Move long-term holdings to a wallet you control. Popular Solana wallets include Phantom, Solflare and Backpack, and hardware wallets such as Ledger support SOL for larger balances.
3. Write your recovery phrase on paper and store it offline. Never type it into a website, a chat or a form, whatever the message claims.
4. Withdraw on the Solana network and send a small test transaction first. SOL also exists in wrapped form on other chains, and choosing the wrong network can delay or lose funds.
5. Keep a small SOL balance for fees and account deposits.
6. Stake from your wallet if you plan to hold for months, after comparing validators.
7. Ignore tokens and NFTs that appear in your wallet uninvited. Many are bait that leads to wallet-draining sites.

Before you buy anything, decide how much you can afford to lose and what would make you sell. Our guide to building an altcoin trade plan before entering a position shows how to set position size, invalidation levels and exit rules in advance.

Is Solana a Good Investment?

Whether Solana is a good investment for you depends on your goals, time horizon and tolerance for loss, and this guide does not try to answer it for you. What it can do is lay out the arguments on each side.

The bull case: Solana carries heavy real-world usage in stablecoin transfers and trading, a much faster consensus protocol is now live, institutions can access SOL through regulated ETFs, and faster disinflation should slow new supply once it activates.

The bear case: the validator set is shrinking and concentrated, client diversity is thin right now, Alpenglow’s speed has yet to be proven on mainnet, competition from Ethereum rollups and other high-performance chains is intense, issuance still dilutes holders who don’t stake, and SOL has lost more than 90% of its value before.

If you decide to invest, size the position so that a deep drawdown would not change your life, and revisit your reasoning when the facts change.

Key Takeaways

• Solana is a proof-of-stake layer 1 blockchain that scales its base layer instead of relying on layer 2 networks.
• Since October 21, 2026, Alpenglow’s Votor protocol targets finality of about 150 milliseconds, with about 6.6 seconds measured on launch day, and Proof of History no longer paces block production.
• Simple transactions cost 0.000005 SOL in base fees, half of which is burned.
• SOL has no supply cap; inflation was about 3.8% in mid-2026 and is set to fall faster once SIMD-0550 activates.
• The main risks are outage history, a shrinking and concentrated validator set, thin client diversity and high price volatility.

Quick Answers on Proof of History, SOL Supply, Fees, Outages and Bitcoin

How this guide was fact-checked: figures were verified on October 24, 2026 against the Solana Foundation’s Alpenglow upgrade page and fee documentation, launch-day Alpenglow dashboard readings reported by Cointelegraph, the Bitwise Staking Report (Q4 2026), Solana Compass validator data, Fidelity Center for Applied Technology’s October 2026 report on Solana’s network health, and Helius’s history of Solana outages. Network statistics change quickly, so check the date beside each figure.