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Foundations

Core blockchain and crypto concepts: wallets, keys, consensus, and the building blocks of Web3.

What Is a Miner in Blockchain Consensus?A miner is the actor that turns raw computational work into blockchain history

What Is a Miner in Blockchain Consensus?A miner is the actor that turns raw computational work into blockchain history. In Proof-of-Work systems, miners do more than add blocks: they decide transaction ordering, provide the economic engine of security, and expose the assumptions that make the chain hard to rewrite.Mar 21, 202623 min read

What Is PBFT (Practical Byzantine Fault Tolerance)?PBFT matters because it answered a hard question: how can a distributed system keep a single, correct history even when some replicas lie, equivocate, or go offline? Its design became the template for much of modern Byzantine fault-tolerant consensus, especially in permissioned systems and several blockchain families

What Is PBFT (Practical Byzantine Fault Tolerance)?PBFT matters because it answered a hard question: how can a distributed system keep a single, correct history even when some replicas lie, equivocate, or go offline? Its design became the template for much of modern Byzantine fault-tolerant consensus, especially in permissioned systems and several blockchain families.Mar 21, 202626 min read

What Is Proof of Authority?Proof of Authority is a blockchain consensus design that replaces open competition with a short list of approved block producers

What Is Proof of Authority?Proof of Authority is a blockchain consensus design that replaces open competition with a short list of approved block producers. That simple change makes networks faster and cheaper to run, but it also changes the trust model: security depends less on anonymous economics and more on who the authorities are, how they are chosen, and what happens when they fail.Mar 21, 202626 min read

What Is Liveness in Consensus?Liveness is the part of consensus that asks a simple but unforgiving question: will the system keep making progress? In blockchains, that means transactions eventually get included and blocks eventually get finalized — but only under specific assumptions about time, faults, and the network

What Is Liveness in Consensus?Liveness is the part of consensus that asks a simple but unforgiving question: will the system keep making progress? In blockchains, that means transactions eventually get included and blocks eventually get finalized — but only under specific assumptions about time, faults, and the network.Mar 21, 202624 min read

What Is a Fork Choice Rule?A blockchain can produce multiple valid-looking histories at the same time

What Is a Fork Choice Rule?A blockchain can produce multiple valid-looking histories at the same time. A fork choice rule is the decision procedure that tells every honest node which branch to treat as canonical, turning a messy tree of blocks into one usable ledger.Mar 21, 202626 min read

What is Leader Election?Leader election is the part of consensus that decides who gets to speak first

What is Leader Election?Leader election is the part of consensus that decides who gets to speak first. That sounds like a scheduling detail, but it turns out to be one of the main ways distributed systems recover from failure, limit chaos, and control who has temporary power over block ordering.Mar 21, 202624 min read

What Is Federated Consensus?Federated consensus tries to solve a hard problem in an unusual way: let anyone join a network, but let each participant decide for itself whom to trust

What Is Federated Consensus?Federated consensus tries to solve a hard problem in an unusual way: let anyone join a network, but let each participant decide for itself whom to trust. The result is a consensus model built from overlapping trust choices rather than a single fixed validator set — powerful when configured well, fragile when those trust relationships do not intersect safely.Mar 21, 202623 min read

What Is a Checkpoint in Blockchain Consensus?A checkpoint is a compact marker for “where the chain stands” at a meaningful boundary

What Is a Checkpoint in Blockchain Consensus?A checkpoint is a compact marker for “where the chain stands” at a meaningful boundary. It matters because consensus systems need a stable point to vote on, finalize around, or sync from without replaying everything from genesis.Mar 21, 202622 min read

What is a Consensus Mechanism?Consensus mechanisms are the answer to a deceptively hard question: how can many machines that do not fully trust one another still agree on a single history? Their design determines not just security, but also who gets influence, how quickly transactions feel final, and what kinds of failures a blockchain can survive

What is a Consensus Mechanism?Consensus mechanisms are the answer to a deceptively hard question: how can many machines that do not fully trust one another still agree on a single history? Their design determines not just security, but also who gets influence, how quickly transactions feel final, and what kinds of failures a blockchain can survive.Mar 21, 202626 min read

What Is Delegated Proof of Stake?Delegated Proof of Stake tries to solve a hard tradeoff in blockchains: how to get fast, cheap consensus without handing permanent control to a small club

What Is Delegated Proof of Stake?Delegated Proof of Stake tries to solve a hard tradeoff in blockchains: how to get fast, cheap consensus without handing permanent control to a small club. It does that by letting token holders elect a limited set of block producers — which improves performance, but makes the system depend much more on governance, voter behavior, and concentration of power.Mar 21, 202625 min read

What is the UTXO Model?The UTXO model treats money on a blockchain not as a balance inside an account, but as a collection of spendable pieces created by past transactions

What is the UTXO Model?The UTXO model treats money on a blockchain not as a balance inside an account, but as a collection of spendable pieces created by past transactions. That small shift changes how validation, privacy, fees, parallelism, and smart contract design work across systems from Bitcoin to extended UTXO chains.Mar 21, 202622 min read

What Is an Uncle Block?Uncle blocks reveal a basic fact about proof-of-work blockchains: the network is never perfectly synchronized

What Is an Uncle Block?Uncle blocks reveal a basic fact about proof-of-work blockchains: the network is never perfectly synchronized. Two miners can do valid work at nearly the same time, and the protocol must decide what to keep, what to discard, and how much of that “lost” work should still count.Mar 21, 202621 min read