Solana is a public blockchain designed to process a large number of transactions quickly and cheaply, so that applications such as exchanges, payments and games can run directly on-chain. If you have heard that Solana is "fast", this guide explains what that actually means, how the network is organised, and where its trade-offs lie.
We will keep the jargon to a minimum and explain each term the first time it appears.
Solana in one paragraph
Solana is a proof-of-stake blockchain whose mainnet beta launched in March 2020. Anyone can send transactions, build applications (called programs) and hold its native token, SOL. Thousands of independent computers, called validators, keep copies of the ledger, check each other's work and agree on the order of transactions. SOL is used to pay transaction fees and to stake, which is how validators earn the right to take part in consensus.
The building blocks
SOL and lamports
SOL is divisible into one billion smaller units called lamports (1 SOL = 1,000,000,000 lamports). Fees and account balances are tracked in lamports under the hood, which is why you will sometimes see very small numbers in wallet details or block explorers.
Accounts: where everything lives
On Solana, almost everything is an account: your wallet address, a token balance, a program's code and the data that program stores. Each account has an address, a balance of lamports, some data, and an owner program that is allowed to change it.
A useful mental model is a filing cabinet. Every drawer (account) has a label (address) and contents (data), and only the drawer's owner program can rearrange what is inside. Your wallet can always spend its own SOL because you hold the private key that signs for it.
Accounts that store data must hold a small minimum balance of SOL, known as the rent-exempt deposit, proportional to how much space they use. The deposit is returned if the account is closed. This is why, for example, receiving a new token for the first time can cost a fraction of a SOL: a new token account has to be created for you.
Programs: on-chain applications
What other blockchains call smart contracts, Solana calls programs. A key design choice is that programs are stateless: the code lives in one account and the data it works on lives in separate accounts. A token program, for instance, does not store every balance itself; each balance sits in its own token account that the program owns.
What happens when you send a transaction
A transaction is a signed message that asks one or more programs to do something, such as transfer SOL or swap one token for another. Each transaction lists, up front, every account it will read or write.
That up-front list is one of the main reasons Solana can be fast. Because the validator knows which accounts each transaction touches, transactions that do not touch the same accounts can be executed in parallel, across many CPU cores at once. Solana's runtime that does this is often referred to as Sealevel. Two people swapping in unrelated markets do not have to wait for each other; two people trying to write to the same account do.
The steps, simplified:
Your wallet builds the transaction and you sign it with your private key.
The transaction is sent to the validator currently scheduled to produce blocks, the leader. Leaders rotate on a published schedule.
The leader executes transactions, packs them into a block and shares it with the rest of the network.
Validators vote on blocks. Once enough stake has agreed, the block is finalised and cannot be reversed.
Time on Solana is divided into slots, each targeting roughly 400 milliseconds, and slots are grouped into epochs of about two days, after which the leader schedule and staking rewards are updated.
How consensus works, and what Alpenglow changed
Consensus is how thousands of independent validators agree on a single history. Validators' influence is proportional to the amount of SOL staked with them, which is what makes Solana a proof-of-stake network.
For most of Solana's history, consensus relied on two components:
Proof of History (PoH), a cryptographic clock: a continuous chain of hashes that let validators agree on the passage of time and the order of events without constantly messaging each other.
Tower BFT, a voting protocol in which validators cast votes as on-chain transactions, with finality typically arriving after several seconds.
On 21 October 2026, Solana mainnet switched to a new consensus protocol called Alpenglow, developed by the engineering firm Anza. Alpenglow's voting component, Votor, replaces Tower BFT: validators now exchange votes directly and aggregate them into certificates rather than writing every vote to the chain, and Proof of History no longer plays a role in consensus. The headline goal is much faster finality, targeted at around 150 milliseconds compared with roughly 12.8 seconds under the old design. Independent measurements of real-world finality after the switch were still being gathered at the time of writing, and a related change to how block data is spread across the network, called Rotor, is being handled as a separate proposal.
If you use Solana through a wallet, you do not need to do anything differently. The practical effect is that transactions should be confirmed and settled more quickly.
Fees: why Solana is cheap
Every transaction pays a base fee of 5,000 lamports per signature, which is 0.000005 SOL for a typical single-signature transaction. Half of the base fee is burned (permanently removed from supply) and half goes to the validator.
When the network is busy, users can add an optional priority fee, priced per unit of computation, to make it more likely the leader includes their transaction promptly. Priority fees go entirely to the validator. Fees are paid even if a transaction fails, which is worth remembering when markets are volatile and trades revert.
Because SOL's price changes, so does the cost of a fee in pounds or dollars; but for ordinary transfers it is usually a small fraction of a cent. We cover fees in more depth in How Solana Token Swaps Work.
Validators, staking and client software
Validators run software clients that implement the Solana protocol. Having more than one independent client reduces the chance that a single bug takes down the network. The main client, Agave, is maintained by Anza; Firedancer, an independent client built by Jump Crypto, has been running on mainnet in production alongside a hybrid version called Frankendancer.
You do not need to run a validator to take part. SOL holders can delegate (stake) their SOL to a validator and earn a share of the rewards, while keeping ownership of their coins. Staking is not risk-free: rewards vary, staked SOL takes time to activate and deactivate, and choosing a reliable validator matters. Newly issued SOL from the network's inflation schedule, which started at 8% a year and decreases annually towards a long-term rate of 1.5%, funds much of these rewards.
What people build on Solana
Low fees and fast confirmation make Solana popular for applications where users trade or transact often:
Decentralized exchanges and aggregators, which let you swap tokens from your own wallet. See What Is a Decentralized Exchange?.
Decentralized finance (DeFi): lending, borrowing, liquidity provision and staking products. Start with Solana DeFi Explained for Beginners.
Stablecoins and payments, including dollar-pegged tokens such as USDC.
Token launches, including a large and highly speculative market in meme coins; see What Are Solana Meme Coins?.
The trade-offs
No blockchain is perfect, and an honest picture includes Solana's weaknesses:
Hardware demands. Running a validator requires powerful machines and fast connections, which raises the cost of participation compared with some other networks.
Past outages. Solana has suffered several network halts in its history, including a roughly five-hour stoppage in February 2024. Each was followed by fixes, and multiple validator clients aim to reduce this risk, but it remains part of the record.
Congestion and spam. Cheap transactions make spam cheap too. Priority fees and other changes have improved this, but busy periods can still cause failed transactions.
Complexity. The account model is efficient but less intuitive than some alternatives, which can make mistakes easier for newcomers and developers alike.
Conclusion
Solana combines proof-of-stake security with an execution model built for parallelism, which is why it can offer fast, low-cost transactions. Its newest consensus protocol, Alpenglow, aims to make finality almost instant. For users, the essentials are simple: hold a little SOL for fees, keep your recovery phrase offline, double-check what you sign, and treat any promise of easy profit with suspicion.
Ready to get hands-on? Our Phantom Wallet: Complete Beginner's Guide walks you through setting up a wallet safely.
Sources and further reading
Educational content, not financial advice. This article explains how things work; it is not a recommendation to buy, sell or hold any asset. Crypto assets are volatile and high-risk, smart contracts can fail, and you can lose all of the money you put in. Do your own research, check official sources, and never share your seed phrase. See our full disclaimer.
