OGGlossary OSSolana vocabulary rebuilt for builders.
ENPT-BRES
Programming Model

Buffer Account

A temporary account used during Solana program deployment to hold the program's ELF binary before it is written to the program data account. The deployer creates a buffer account, uploads the compiled SBF binary in chunks via the Upgradeable BPF Loader's Write instruction, and then issues a Deploy or Upgrade instruction that copies the buffer contents to the final program data account. Buffer accounts can be closed after deployment to reclaim rent.

IDbuffer-account
Plain meaning

Plain meaning

Start with the shortest useful explanation before going deeper.

A temporary account used during Solana program deployment to hold the program's ELF binary before it is written to the program data account. The deployer creates a buffer account, uploads the compiled SBF binary in chunks via the Upgradeable BPF Loader's Write instruction, and then issues a Deploy or Upgrade instruction that copies the buffer contents to the final program data account. Buffer accounts can be closed after deployment to reclaim rent.

Mental model

Mental model

Use the quick analogy first so the term is easier to reason about when you meet it in code, docs, or prompts.

Think of it as one of the core moving pieces your program reads, writes, or invokes at runtime.

Technical context

Technical context

Place the term inside its Solana layer so the definition is easier to reason about.

Accounts, instructions, PDAs, transactions, and execution flow.

Why builders care

Why builders care

Turn the term from vocabulary into something operational for product and engineering work.

This term unlocks adjacent concepts quickly, so it works best when you treat it as a junction instead of an isolated definition.

AI handoff

AI handoff

Use this compact block when you want to give an agent or assistant grounded context without dumping the entire page.

Buffer Account (buffer-account)
Category: Programming Model
Definition: A temporary account used during Solana program deployment to hold the program's ELF binary before it is written to the program data account. The deployer creates a buffer account, uploads the compiled SBF binary in chunks via the Upgradeable BPF Loader's Write instruction, and then issues a Deploy or Upgrade instruction that copies the buffer contents to the final program data account. Buffer accounts can be closed after deployment to reclaim rent.
Related: Upgradeable BPF Loader, Program Data Account, ELF Binary
Glossary Copilot

Ask grounded Solana questions without leaving the glossary.

Use glossary context, relationships, mental models, and builder paths to get structured answers instead of generic chat output.

Open full Copilot workspace
Explain this code

Optional: paste Anchor, Solana, or Rust code so the Copilot can map primitives back to glossary terms.

Ask a glossary-grounded question

Ask a glossary-grounded question

The Copilot will answer using the current term, related concepts, mental models, and the surrounding glossary graph.

Concept graph

See the term as part of a network, not a dead-end definition.

These branches show which concepts this term touches directly and what sits one layer beyond them.

Branch

Upgradeable BPF Loader

The current BPF Loader (BPFLoaderUpgradeab1e111...) that supports deploying and upgrading programs. It creates three accounts: the program account (thin proxy with executable flag), the program data account (holds the actual ELF bytecode), and records the upgrade authority. Programs can be made immutable by setting the authority to None.

BPF LoaderUpgrade Authority
Open term
Branch

Program Data Account

The account that stores the actual SBF ELF bytecode for an upgradeable program. It is separate from the program's main account (which just points to the program data). This separation allows the bytecode to be swapped during upgrades while the program ID stays the same. The program data account also stores the upgrade authority pubkey.

Program
Open term
Branch

ELF Binary

Executable and Linkable Format — the binary format used for deployed Solana programs. Rust source code is compiled via cargo-build-sbf into an SBF-targeted ELF binary (.so file) that the Solana runtime loads and executes. The ELF format contains the program's compiled bytecode, symbol tables, and relocation information. ELF binaries are uploaded to buffer accounts during deployment and then written to the program data account.

SBF (Solana Bytecode Format)cargo-build-sbf
Open term
Next concepts to explore

Keep the learning chain moving instead of stopping at one definition.

These are the next concepts worth opening if you want this term to make more sense inside a real Solana workflow.

Programming Model

Upgradeable BPF Loader

The current BPF Loader (BPFLoaderUpgradeab1e111...) that supports deploying and upgrading programs. It creates three accounts: the program account (thin proxy with executable flag), the program data account (holds the actual ELF bytecode), and records the upgrade authority. Programs can be made immutable by setting the authority to None.

Open term
Programming Model

Program Data Account

The account that stores the actual SBF ELF bytecode for an upgradeable program. It is separate from the program's main account (which just points to the program data). This separation allows the bytecode to be swapped during upgrades while the program ID stays the same. The program data account also stores the upgrade authority pubkey.

Open term
Programming Fundamentals

ELF Binary

Executable and Linkable Format — the binary format used for deployed Solana programs. Rust source code is compiled via cargo-build-sbf into an SBF-targeted ELF binary (.so file) that the Solana runtime loads and executes. The ELF format contains the program's compiled bytecode, symbol tables, and relocation information. ELF binaries are uploaded to buffer accounts during deployment and then written to the program data account.

Open term
Programming Model

Bump Seed

A single byte (255 down to 0) appended to PDA seeds to push the derived address off the Ed25519 curve. find_program_address tries bump=255 first and decrements until finding a valid PDA. The first valid bump found is the canonical bump. Always store and reuse the canonical bump to avoid security issues.

Open term
Commonly confused with

Terms nearby in vocabulary, acronym, or conceptual neighborhood.

These entries are easy to mix up when you are reading quickly, prompting an LLM, or onboarding into a new layer of Solana.

Programming Modelaccount

Account

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.

Open term
Programming Modelaccount-data

Account Data

The byte array stored in an account that holds program-specific state. Data is typically serialized using Borsh and must be explicitly allocated at account creation. The maximum data size is 10MB. Programs are responsible for defining and managing their own data layout, including discriminators for type identification.

Open term
Programming Modelclose-account

Close Account

The process of reclaiming an account's lamports and marking it for deletion. To close an account: transfer all lamports to a recipient, zero out the data, and (in Anchor) set the discriminator to a closed sentinel. The runtime garbage-collects zero-lamport accounts. Failing to zero data enables revival attacks.

Open term
Related terms

Follow the concepts that give this term its actual context.

Glossary entries become useful when they are connected. These links are the shortest path to adjacent ideas.

Programming Modelupgradeable-loader

Upgradeable BPF Loader

The current BPF Loader (BPFLoaderUpgradeab1e111...) that supports deploying and upgrading programs. It creates three accounts: the program account (thin proxy with executable flag), the program data account (holds the actual ELF bytecode), and records the upgrade authority. Programs can be made immutable by setting the authority to None.

Open term
Programming Modelprogram-data

Program Data Account

The account that stores the actual SBF ELF bytecode for an upgradeable program. It is separate from the program's main account (which just points to the program data). This separation allows the bytecode to be swapped during upgrades while the program ID stays the same. The program data account also stores the upgrade authority pubkey.

Open term
Programming Fundamentalself-binary

ELF Binary

Executable and Linkable Format — the binary format used for deployed Solana programs. Rust source code is compiled via cargo-build-sbf into an SBF-targeted ELF binary (.so file) that the Solana runtime loads and executes. The ELF format contains the program's compiled bytecode, symbol tables, and relocation information. ELF binaries are uploaded to buffer accounts during deployment and then written to the program data account.

Open term
More in category

Stay in the same layer and keep building context.

These entries live beside the current term and help the page feel like part of a larger knowledge graph instead of a dead end.

Programming Model

Account

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.

Open term
Programming Model

Program

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).

Open term
Programming Model

Instruction

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.

Open term
Programming Model

Transaction

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.

Open term