The Challenge

Day 25 of 100 Days of Solana: inspect system program accounts. Your wallet, the System Program, native programs, sysvar accounts. Use the CLI and Explorer. Understand how they differ and how they're the same.

I'd been hearing "everything is an account" for 25 days. This was the day I actually verified it.

Starting With My Wallet

solana account <MY_ADDRESS> --url devnet

Output:
Balance: 1.247 SOL
Owner: 11111111111111111111111111111111
Executable: false
Rent Epoch: 0

The owner field jumped out: 11111111111111111111111111111111. The System Program. My wallet isn't a special type of thing — it's an account that the System Program owns and manages. Every SOL transfer I've ever made was the System Program modifying this row.

Inspecting the System Program Itself

solana account 11111111111111111111111111111111 --url devnet

Output:
Balance: 1 SOL
Owner: NativeLoader1111111111111111111111111111111
Executable: true
Data Length: 14 bytes

The System Program the program that underlies every wallet on Solana, that has processed billions of transactions is an account with 14 bytes of data and a 1 SOL balance. The executable: true flag is the only thing that distinguishes it from my wallet structurally. Same schema. One boolean different.

The 14 bytes confused me at first. After some digging: native programs have their code compiled directly into the validator binary. The account is essentially a registry entry a marker that says "this address is the System Program."

The BPF Loader

solana account BPFLoaderUpgradeab1e11111111111111111111111 --url devnet

Executable: true
Owner: NativeLoader
Data Length: 36 bytes

The ownership chain: NativeLoader → BPF Loader → my future programs. Three levels, all expressed as account ownership fields.

Sysvar Accounts

solana account SysvarC1ock11111111111111111111111111111111 --url devnet

The Clock sysvar holds the current slot, epoch, and unix timestamp. Updated every slot by the runtime. Programs that need time-based logic read this account.

What surprised me: it's just an account. executable: false, owned by the Sysvar program, 40 bytes of encoded data. The same structure as everything else.

The Mental Model I Built

Every account sits on a spectrum from "pure data" to "pure code," determined entirely by two fields:

• executable is this account code or data?
• owner which program has authority over this account?

No special types. No separate registries. One table, differentiated entirely by field values.

The CLI Commands Worth Bookmarking

solana account 11111111111111111111111111111111              # System Program
solana account BPFLoaderUpgradeab1e11111111111111111111111  # BPF Loader
solana account SysvarC1ock11111111111111111111111111111111  # Clock sysvar
solana account SysvarRent111111111111111111111111111111111  # Rent sysvar

One command. Any account. The entire network is readable.