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Network

Block Space Auction

The competitive process by which transactions and bundles bid for inclusion in a block through priority fees and Jito tips. Validators acting as leaders select transactions that maximize their revenue, creating a market for block space. During periods of high demand, block space auctions drive up priority fees for contested accounts. Jito's Block Engine formalizes this auction by simulating bundles and selecting the most profitable set for each block.

IDblock-space-auction
Plain meaning

Plain meaning

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The competitive process by which transactions and bundles bid for inclusion in a block through priority fees and Jito tips. Validators acting as leaders select transactions that maximize their revenue, creating a market for block space. During periods of high demand, block space auctions drive up priority fees for contested accounts. Jito's Block Engine formalizes this auction by simulating bundles and selecting the most profitable set for each block.

Mental model

Mental model

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Clusters, nodes, MEV actors, routing, and operating environments.

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Block Space Auction (block-space-auction)
Category: Network
Definition: The competitive process by which transactions and bundles bid for inclusion in a block through priority fees and Jito tips. Validators acting as leaders select transactions that maximize their revenue, creating a market for block space. During periods of high demand, block space auctions drive up priority fees for contested accounts. Jito's Block Engine formalizes this auction by simulating bundles and selecting the most profitable set for each block.
Related: MEV (Maximal Extractable Value), Priority Fee, Block Engine (Jito)
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Concept graph

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Branch

MEV (Maximal Extractable Value)

The profit a block producer (leader) or sophisticated trader can extract by controlling the ordering, inclusion, or exclusion of transactions within a block — including strategies like front-running, back-running, sandwich attacks, and arbitrage. On Solana, MEV dynamics differ from Ethereum because there is no public mempool; transactions are forwarded directly to the current leader, making latency and validator relationships central to MEV capture. The Jito infrastructure provides the dominant MEV marketplace on Solana through bundles and tips.

Jito (MEV Infrastructure)Front-Running
Open term
Branch

Priority Fee

An optional additional fee paid on top of the base fee to increase the likelihood that a transaction is processed quickly by the current leader, expressed as a price in micro-lamports per compute unit (CU). The total priority fee equals (compute unit price × compute unit limit) / 1,000,000 lamports. Leaders sort transactions in their queue by fee-per-CU, so setting a competitive priority fee is the primary mechanism for ensuring reliable transaction landing during congestion.

Compute Units (CU)Base Fee
Open term
Branch

Block Engine (Jito)

Jito's off-chain infrastructure component that receives bundles from MEV searchers, simulates them against the current chain state to verify profitability and validity, and forwards the highest-value bundles to the current Jito-enabled leader just before block production. The Block Engine operates as a low-latency relay that continuously tracks the leader schedule and streams winning bundles in real time, acting as a private transaction ordering marketplace sitting between searchers and validators.

Bundle (Jito)
Open term
Next concepts to explore

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Network

MEV (Maximal Extractable Value)

The profit a block producer (leader) or sophisticated trader can extract by controlling the ordering, inclusion, or exclusion of transactions within a block — including strategies like front-running, back-running, sandwich attacks, and arbitrage. On Solana, MEV dynamics differ from Ethereum because there is no public mempool; transactions are forwarded directly to the current leader, making latency and validator relationships central to MEV capture. The Jito infrastructure provides the dominant MEV marketplace on Solana through bundles and tips.

Open term
Network

Priority Fee

An optional additional fee paid on top of the base fee to increase the likelihood that a transaction is processed quickly by the current leader, expressed as a price in micro-lamports per compute unit (CU). The total priority fee equals (compute unit price × compute unit limit) / 1,000,000 lamports. Leaders sort transactions in their queue by fee-per-CU, so setting a competitive priority fee is the primary mechanism for ensuring reliable transaction landing during congestion.

Open term
Network

Block Engine (Jito)

Jito's off-chain infrastructure component that receives bundles from MEV searchers, simulates them against the current chain state to verify profitability and validity, and forwards the highest-value bundles to the current Jito-enabled leader just before block production. The Block Engine operates as a low-latency relay that continuously tracks the leader schedule and streams winning bundles in real time, acting as a private transaction ordering marketplace sitting between searchers and validators.

Open term
Network

Blockhash (Recent)

A 32-byte hash derived from the bank's state at a given slot, included in every Solana transaction to prove the transaction was created recently and to prevent replay attacks. A blockhash remains valid for approximately 150 slots (~60–90 seconds at normal slot times); transactions submitted with an expired blockhash are rejected outright. Clients must fetch a fresh blockhash before signing and ideally reuse it for as short a window as possible to maximize landing probability.

Open term
Commonly confused with

Terms nearby in vocabulary, acronym, or conceptual neighborhood.

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Networkblock-engine

Block Engine (Jito)

Jito's off-chain infrastructure component that receives bundles from MEV searchers, simulates them against the current chain state to verify profitability and validity, and forwards the highest-value bundles to the current Jito-enabled leader just before block production. The Block Engine operates as a low-latency relay that continuously tracks the leader schedule and streams winning bundles in real time, acting as a private transaction ordering marketplace sitting between searchers and validators.

Open term
Related terms

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Networkmev

MEV (Maximal Extractable Value)

The profit a block producer (leader) or sophisticated trader can extract by controlling the ordering, inclusion, or exclusion of transactions within a block — including strategies like front-running, back-running, sandwich attacks, and arbitrage. On Solana, MEV dynamics differ from Ethereum because there is no public mempool; transactions are forwarded directly to the current leader, making latency and validator relationships central to MEV capture. The Jito infrastructure provides the dominant MEV marketplace on Solana through bundles and tips.

Open term
Networkpriority-fee

Priority Fee

An optional additional fee paid on top of the base fee to increase the likelihood that a transaction is processed quickly by the current leader, expressed as a price in micro-lamports per compute unit (CU). The total priority fee equals (compute unit price × compute unit limit) / 1,000,000 lamports. Leaders sort transactions in their queue by fee-per-CU, so setting a competitive priority fee is the primary mechanism for ensuring reliable transaction landing during congestion.

Open term
Networkblock-engine

Block Engine (Jito)

Jito's off-chain infrastructure component that receives bundles from MEV searchers, simulates them against the current chain state to verify profitability and validity, and forwards the highest-value bundles to the current Jito-enabled leader just before block production. The Block Engine operates as a low-latency relay that continuously tracks the leader schedule and streams winning bundles in real time, acting as a private transaction ordering marketplace sitting between searchers and validators.

Open term
More in category

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Network

Mainnet Beta

Solana's primary production cluster where real SOL and real economic activity occur; the "beta" designation reflects the network's ongoing protocol development despite being fully live since March 2020. It uses the same architecture as other clusters but with real validator stakes, live staking rewards, and permanent on-chain state. All production dApps, tokens, and NFTs exist on Mainnet Beta.

Open term
Network

Devnet

A persistent public Solana cluster intended for application development and testing, running the same software version as Mainnet Beta but with no real economic value. Devnet SOL can be freely airdropped via the CLI or faucet APIs, and the ledger may be reset periodically by Solana Labs. Developers use Devnet to test programs and integrations before deploying to Mainnet Beta.

Open term
Network

Testnet

A public Solana cluster used primarily by the Solana core team and validators to test new software releases, performance benchmarks, and network upgrades under real network conditions before they reach Mainnet Beta. Testnet SOL has no monetary value, and the ledger is reset more frequently than Devnet; it is less suitable for application development and more suited for validator operators validating their infrastructure.

Open term
Network

TPS (Transactions Per Second)

The rate at which a Solana cluster processes and commits transactions; Solana's theoretical maximum exceeds 65,000 TPS due to its parallel execution model, though real-world sustained throughput on Mainnet Beta typically ranges from 2,000–5,000 non-vote TPS under normal load. Vote transactions (used for consensus) make up a significant portion of all on-chain activity and are counted separately. High TPS is enabled by Proof of History timestamps, Sealevel parallel execution, and Gulf Stream mempool-less forwarding.

Open term