The built-in native program (address: 11111111111111111111111111111111) responsible for creating new accounts, transferring SOL between accounts, allocating account data space, and assigning account ownership to programs. It is the only program that can create new accounts and is invoked in nearly every transaction.
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The built-in native program (address: 11111111111111111111111111111111) responsible for creating new accounts, transferring SOL between accounts, allocating account data space, and assigning account ownership to programs. It is the only program that can create new accounts and is invoked in nearly every transaction.
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Think of it as one of the core moving pieces your program reads, writes, or invokes at runtime.
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Accounts, instructions, PDAs, transactions, and execution flow.
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System Program (system-program) Category: Programming Model Definition: The built-in native program (address: 11111111111111111111111111111111) responsible for creating new accounts, transferring SOL between accounts, allocating account data space, and assigning account ownership to programs. It is the only program that can create new accounts and is invoked in nearly every transaction. Related: Program, Create Account, Transaction
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Executable code deployed on-chain, equivalent to a smart contract on other blockchains. Programs are stateless—they store no data themselves but read/write data in separate accounts they own. Programs are compiled to SBF bytecode and loaded via the BPF Loader. Every program has a unique Program ID (its account's public key).
A System Program instruction that creates a new account with specified space and owner, funding it with enough lamports for rent exemption. Parameters: from (fee payer), to (new account keypair), lamports, space (bytes), and owner (program ID). The new account's data is zero-initialized.
An atomic unit of execution containing one or more instructions, a recent blockhash, and one or more signatures. All instructions in a transaction execute sequentially and atomically—if any instruction fails, the entire transaction reverts. Transactions have a 1,232-byte size limit (matching IPv6 MTU) and a default 200,000 CU budget.
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Executable code deployed on-chain, equivalent to a smart contract on other blockchains. Programs are stateless—they store no data themselves but read/write data in separate accounts they own. Programs are compiled to SBF bytecode and loaded via the BPF Loader. Every program has a unique Program ID (its account's public key).
A native Solana program (address: ComputeBudget111111111111111111111111111111) that allows transactions to configure their compute resource limits. It provides two key instructions: SetComputeUnitLimit (set the max CU a transaction can consume, up to 1.4M) and SetComputeUnitPrice (set the micro-lamport price per CU for priority fees). These instructions must appear before any program instructions in the transaction.
A function that derives a PDA by iterating bump seeds from 255 down to 0 until finding a pubkey not on the Ed25519 curve. It returns (pubkey, bump). In Anchor, the #[account(seeds=[...], bump)] constraint calls this automatically. The corresponding create_program_address skips iteration and takes an explicit bump.
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Executable code deployed on-chain, equivalent to a smart contract on other blockchains. Programs are stateless—they store no data themselves but read/write data in separate accounts they own. Programs are compiled to SBF bytecode and loaded via the BPF Loader. Every program has a unique Program ID (its account's public key).
A System Program instruction that creates a new account with specified space and owner, funding it with enough lamports for rent exemption. Parameters: from (fee payer), to (new account keypair), lamports, space (bytes), and owner (program ID). The new account's data is zero-initialized.
An atomic unit of execution containing one or more instructions, a recent blockhash, and one or more signatures. All instructions in a transaction execute sequentially and atomically—if any instruction fails, the entire transaction reverts. Transactions have a 1,232-byte size limit (matching IPv6 MTU) and a default 200,000 CU budget.
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The fundamental data storage unit on Solana. Every piece of state is stored in an account identified by a 32-byte public key. Accounts hold a lamport balance, an owner program, a data byte array (up to 10MB), and an executable flag. Only the owning program can modify an account's data, but anyone can credit lamports to it.
Executable code deployed on-chain, equivalent to a smart contract on other blockchains. Programs are stateless—they store no data themselves but read/write data in separate accounts they own. Programs are compiled to SBF bytecode and loaded via the BPF Loader. Every program has a unique Program ID (its account's public key).
A single operation within a transaction that invokes a program. An instruction specifies: (1) the program ID to call, (2) an array of account metas (pubkey, is_signer, is_writable), and (3) an opaque data byte array. Programs decode the instruction data to determine which operation to perform.
An atomic unit of execution containing one or more instructions, a recent blockhash, and one or more signatures. All instructions in a transaction execute sequentially and atomically—if any instruction fails, the entire transaction reverts. Transactions have a 1,232-byte size limit (matching IPv6 MTU) and a default 200,000 CU budget.