What Is Solana Explorer?
If you've spent the last few weeks writing scripts to fetch account balances, decode transactions, and inspect on-chain programs via the CLI, opening Solana Explorer for the first time feels like switching from a terminal to a dashboard. Everything you've been reading in JSON is now laid out visually but understanding what you're looking at is still a developer skill.
This post walks you through Solana Explorer as a developer tool, not just a block explorer. By the end, you'll know what every section means and how it maps to the data you've already been working with in code.
Devnet vs Mainnet Switch First
The first thing to do when opening explorer.solana.com is check which network you're on. The network switcher is in the top-right corner. If you've been working through 100 Days of Solana, most of your activity has been on devnet so switch there first or you won't find your own wallets and transactions.
This is the visual equivalent of setting your RPC endpoint in code:
const connection = new Connection(clusterApiUrl('devnet'));
Mainnet is the live network with real money. Devnet is the sandbox. Explorer shows both just make sure you're looking at the right one.
Anatomy of a Transaction in Explorer
Click any recent transaction and you'll see several sections. Here's how they map to what you know from code:
Signature This is the unique transaction ID, equivalent to the string you get back from sendTransaction(). It's how you look up any transaction on-chain.
Result Success or failure. On-chain, a failed transaction still gets recorded and still costs a fee. Explorer shows you the error message if it failed, which is invaluable for debugging.
Timestamp When the transaction was finalized. Solana's block time is roughly 400ms, so this is nearly real-time.
Fee Shown in SOL. Transaction fees on Solana are tiny usually around 0.000005 SOL (5000 lamports). You've worked with lamports in code; Explorer converts them to SOL for readability.
Account Inputs This is the list of accounts involved in the transaction. Every Solana transaction must declare upfront which accounts it will read or write. You'll see which accounts are marked as writable and which are signers.
Instruction Data The raw instruction sent to a program. For simple SOL transfers this is minimal, but for program interactions it contains the encoded instruction arguments.
Log Messages This is the most useful section for developers. Every msg!() call from a Solana program shows up here. When your program panics or hits an error, the log is where you'll find out why.
Finding Your Own Wallet
Paste your devnet wallet address into the search bar. You'll see:
SOL Balance in SOL, with the lamport equivalent
Token Accounts any SPL tokens you hold
Transaction History every transaction this wallet has signed, in chronological order
Compare this to what you'd get from the CLI:
solana balance <YOUR_WALLET_ADDRESS> --url devnet
solana transaction-history <YOUR_WALLET_ADDRESS> --url devnet
Explorer gives you the same data, just navigable. The CLI gives you the same data, just scriptable. Both are reading from the same on-chain state.
Exploring a Native Program
Search for 11111111111111111111111111111111 this is the System Program. Every SOL transfer goes through it. In Explorer you'll see it marked as a native program with the executable flag set to true and a data field that's essentially empty (native programs live in the validator, not in account data).
This is a concept you'll explore deeper in Arc 4: on Solana, programs are just accounts with executable: true. The System Program is the most fundamental one it handles account creation and SOL transfers.
What Explorer Can't Tell You
Explorer is read-only and retrospective. It shows you what happened, not why. For debugging a failing program, you still need your logs and local testing. For building, you still need the SDK. Explorer is the lens you use to verify not the tool you use to build.
Takeaway
Every CLI command you've run in the last 26 days has been reading from the same data that Explorer displays. The difference is interface, not information. Use Explorer to verify your work, explore unfamiliar programs, and build intuition for what on-chain activity looks like at scale.
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