The average time between consecutive blocks being produced. Bitcoin: ~10 minutes, Ethereum: ~12 seconds, Solana: ~400ms. Shorter block times enable faster transaction confirmation but increase orphan rates and storage requirements. Block time is a fundamental trade-off between speed and network overhead.
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The average time between consecutive blocks being produced. Bitcoin: ~10 minutes, Ethereum: ~12 seconds, Solana: ~400ms. Shorter block times enable faster transaction confirmation but increase orphan rates and storage requirements. Block time is a fundamental trade-off between speed and network overhead.
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Block Time (block-time) Category: Blockchain General Definition: The average time between consecutive blocks being produced. Bitcoin: ~10 minutes, Ethereum: ~12 seconds, Solana: ~400ms. Shorter block times enable faster transaction confirmation but increase orphan rates and storage requirements. Block time is a fundamental trade-off between speed and network overhead. Related: Slot, Finality
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A time window during which a designated leader validator can produce a block. Each slot lasts approximately 400 milliseconds. Slots are numbered sequentially from genesis and grouped into epochs of 432,000 slots (~2-3 days). Not every slot produces a block—a skipped slot means the leader was offline or too slow.
The guarantee that a transaction cannot be reversed. Solana offers two levels: optimistic confirmation (~400ms, 66.7%+ stake voted) and full finality (~12-13 seconds, 31+ confirmations rooted). Once a slot is rooted, its transactions are irreversible under the assumption that no more than 1/3 of stake is malicious.
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A web application that indexes and displays blockchain data in a human-readable format. Explorers show transaction details, account balances, program interactions, and network statistics. Solana explorers include Solana Explorer (explorer.solana.com), Solscan, SolanaFM, and XRAY. Ethereum uses Etherscan. Essential tools for debugging and verification.
Concept articulated by Vitalik Buterin that blockchains can optimize for only two of three properties: decentralization, security, and scalability. Solana prioritizes scalability and security with specialized hardware requirements, while Ethereum L2s sacrifice some sovereignty for throughput. No chain has definitively solved the trilemma.
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A time window during which a designated leader validator can produce a block. Each slot lasts approximately 400 milliseconds. Slots are numbered sequentially from genesis and grouped into epochs of 432,000 slots (~2-3 days). Not every slot produces a block—a skipped slot means the leader was offline or too slow.
The guarantee that a transaction cannot be reversed. Solana offers two levels: optimistic confirmation (~400ms, 66.7%+ stake voted) and full finality (~12-13 seconds, 31+ confirmations rooted). Once a slot is rooted, its transactions are irreversible under the assumption that no more than 1/3 of stake is malicious.
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A distributed, append-only ledger that records transactions in cryptographically linked blocks. Each block contains a hash of the previous block, forming an immutable chain. Nodes in the network maintain copies of the ledger and reach agreement through consensus mechanisms. Blockchains enable trustless, decentralized record-keeping without a central authority.
The protocol by which nodes in a distributed network agree on the current state of the ledger. Common mechanisms include Proof of Work (Bitcoin), Proof of Stake (Ethereum, Solana), and BFT variants. Consensus ensures all honest nodes converge on the same transaction history despite potential network delays or malicious actors.
A consensus mechanism where validators are selected to produce blocks based on the amount of cryptocurrency they have staked (locked) as collateral. PoS is energy-efficient compared to Proof of Work. Misbehaving validators risk losing their stake (slashing). Solana, Ethereum (post-Merge), Cosmos, and Cardano use PoS variants.
A consensus mechanism where miners compete to solve computationally expensive puzzles to produce blocks and earn rewards. PoW provides strong security (51% attack resistance) but is energy-intensive. Bitcoin and pre-Merge Ethereum use PoW. The difficulty adjusts to maintain target block times regardless of total network hash power.