What the fee line is paying for
A Solana transaction fee is a count of lamports, split between a base charge per signature and an optional priority charge.
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Essays from the clothbound shelf
The same four guides sit in the reading room. Here they are for the evening before a visit. A signature of your own is still best read at the table.
Reading account keys before the instruction data
The account list is the cast of the transaction. Instruction data only makes sense after each key has a flag and an owner.
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A recent blockhash does not stay recent
The blockhash inside a Solana transaction is a freshness check. After 151 slots it will not land.
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Program logs after the slot is closed
Log lines are the program speaking after execution: invoke, success, or the instruction error that stopped the message.
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