Solana programs and Ethereum smart contracts do the same job through opposite architectures: a Solana program is stateless executable code that owns no data, while an Ethereum contract bundles code and storage into a single entity. Every piece of state a Solana program touches lives in a separate account passed in explicitly with each transaction. That one design decision cascades into everything else — it is why Solana can execute transactions in parallel, why programs are upgradeable by default, and why a Solana “contract audit” is asking a different set of questions than an Ethereum one.
Key Facts
- Solana programs are compiled to eBPF bytecode and written mostly in Rust; Ethereum contracts compile to EVM bytecode, usually from Solidity.
- A Solana program holds no state. All data lives in accounts owned by the program but stored separately.
- Transactions must declare every account they will read or write up front — this is what enables parallel execution.
- Solana programs are upgradeable by default through an upgrade authority; Ethereum contracts are immutable unless built with a proxy pattern.
- Cross-program invocation depth is capped at four levels, which structurally limits reentrancy attacks.
- Program code itself is stored in an account and costs rent proportional to its size.
- One deployed program serves unlimited independent state — the SPL Token Program handles every standard token on the chain.
The Split That Explains Everything
On Ethereum, deploying an ERC-20 token means deploying a new contract containing both the transfer logic and the balance ledger. Ten thousand tokens means ten thousand copies of nearly identical code. On Solana, one SPL Token Program was deployed years ago and every token since then is just a mint account plus balance accounts that program knows how to operate on. Creating a token does not deploy code at all — it creates data.
That is why minting a Solana token costs a fraction of a cent while an Ethereum deployment costs real money, and why the two token models behave so differently in a wallet. It also means a Solana token has no custom code to audit by default. On Ethereum the contract is where a rug hides; on Solana, for a standard token, there is no contract to hide in — the risk moved to mint authorities, liquidity and metadata instead.
Side by Side
| Solana program | Ethereum smart contract | |
|---|---|---|
| Holds its own state | No — state in separate accounts | Yes — storage inside the contract |
| Language | Rust, C, Anchor framework | Solidity, Vyper |
| Runtime | Sealevel, eBPF bytecode | EVM bytecode |
| Execution | Parallel when accounts do not overlap | Strictly sequential |
| Upgradeable | Yes by default, via upgrade authority | No, unless a proxy is used |
| Metering unit | Compute units | Gas |
| Reentrancy exposure | Limited by CPI depth cap | Historically a major attack class |
| Calling another program | Cross-program invocation (CPI) | External call / delegatecall |
Why Parallel Execution Needs Declared Accounts
Ethereum processes transactions one after another because it cannot know in advance what storage a contract will touch — the contract decides at runtime. Solana flips this: a transaction lists every account it will read and every account it will write before execution begins. The runtime reads that list, sees that two transactions touch entirely different accounts, and runs them simultaneously on different cores. Transactions that write to the same account are serialised, which is why a single hot liquidity pool becomes a bottleneck while the rest of the chain flows freely.
The developer cost is real. Forgetting to declare an account produces a runtime error rather than a silent read, and building instructions means assembling account lists by hand or leaning on a framework like Anchor to generate them. It is more work for a more parallel result, and it is a large part of what people mean when they compare the two chains’ throughput without mentioning that the difference starts in the programming model rather than the block size.
Upgradeability Cuts Both Ways
A deployed Solana program has an upgrade authority — a keypair that can replace the program’s code entirely. That is enormously convenient for developers shipping fixes and enormously dangerous for anyone trusting the program with funds. Ethereum’s default immutability forces teams to use proxy contracts if they want upgrades, which at least makes the upgrade path visible in the code.
The mitigation is to set the upgrade authority to null, permanently freezing the program. Serious Solana protocols do this or hand the authority to a multisig, and you can check which on Solscan by opening the program address and reading the upgrade authority field. A live upgrade authority on a program holding pooled funds is the Solana equivalent of an unrenounced owner on an Ethereum contract, and it belongs on the same checklist as the standard rug pull warning signs. Comparative TVL across both ecosystems sits on DefiLlama if you want to see how much value each model actually carries.
What This Means for $DOLAN
DOLAN Duck ($DOLAN) has no program of its own. Its fixed 98.3M supply and roughly 10,700 holders are entries in accounts operated by the SPL Token Program that has been deployed and battle-tested since well before the token existed. There is no bespoke code path, no upgrade authority controlled by a creator, and nothing that could be redeployed to change how transfers behave — because on Solana a plain token does not ship code at all. Anyone evaluating a Solana memecoin should internalise that inversion: stop looking for a malicious contract and start checking mint authority, freeze authority and liquidity, because those are where the equivalent risks actually live.
A Solana program is executable code deployed on-chain, equivalent to an Ethereum smart contract, except it holds no state of its own. All data it operates on lives in separate accounts passed into each transaction.
Mostly Rust, often with the Anchor framework, and occasionally C. The code compiles to eBPF bytecode rather than EVM bytecode, so Solidity contracts cannot be deployed to Solana without a translation layer.
Yes, by default. A program has an upgrade authority that can replace its code entirely. Developers can permanently freeze a program by setting that authority to null, which serious protocols usually do.
Because transactions declare every account they will read or write in advance. The runtime can see which transactions touch different accounts and execute them simultaneously, while transactions hitting the same account are serialised.
No. Standard SPL tokens deploy no code at all — they create a mint account operated by the shared SPL Token Program. There is no per-token contract to audit, which moves the risk to mint authority, freeze authority and liquidity.
Much less than on Ethereum. Cross-program invocation depth is capped at four levels, which structurally prevents the deep recursive call chains that made reentrancy a signature Ethereum vulnerability.
Open the program address on an explorer and read the upgrade authority field. A null authority means the code is frozen; a live keypair means someone can replace the program’s logic.