Shelf guide · 14 January 2026
How the library reads a Solana account card
Before anyone at Notion Beacon talks about programs, they put an account card on the table and read it line by line.
An account, in the way we print it, is a record the Solana network stores under a public address. New learners often arrive saying they have “a wallet.” In this room we answer by laying down a card. The wallet word can wait. The card cannot.
Five lines, in the same order every time
The first line is the address, a public key. It is safe to read aloud. The second line is the owner, and the owner is a program, not a person. Ordinary accounts that simply hold SOL are owned by the system program. Learners meet that program as the famous address made of the digit one repeated. Seeing it on a card is usually the moment the word “owner” stops sounding like a surname.
The third line is the balance in lamports. We write the conversion on the back of the card and leave it there: one SOL is one billion lamports. People who skip that line later misread fees by nine zeros. The fourth line is a yes or no: is this account executable? A program lives in an executable account. A learner’s ordinary account is not executable, and that difference matters on evening five of the series, not before.
The fifth line is the length of the data field, in bytes. Many first accounts have empty data. Token accounts and other program-owned accounts do not. We do not open the bytes on the first reading. We only notice whether the field is empty, because an empty field and a long field are different animals when rent comes up.
Rent, said once, without a formula
Solana asks an account to hold a minimum balance that depends on how large its data is. Hold enough, and the account can remain without a separate rent payment draining it. That condition is what people mean by rent-exempt. On the card we do not print a formula. Formulas on the public web drift, and a library that copies a stale one teaches a confident error. In the study series, Han brings a worked sheet for two sizes and the learners do the arithmetic from that sheet. In this guide it is enough to know the direction: more data, higher minimum balance.
The line we refuse to print
A secret key, a seed phrase, or a recovery sentence never goes on an account card. The address is the public name of the record. The secret is the means to sign for it. Visitors sometimes bring a screenshot with both. Park covers the secret with a paper strip before the card is discussed, and he asks the visitor to cross it out before they leave the desk. The library keeps no copy.
If you can point to those five lines and say which program owns the account, you are ready for the transaction shelf. If the owner field still looks like a person’s name, stay with this card. The desk hour exists for that exact pause.