An attestation is a validator's signed vote about which block heads the chain and which checkpoint should be finalized. This explains what's inside an attestation, how votes aggregate, and why attesting — not proposing — is a validator's real job.

A slot is the 12-second window in which one chosen validator gets to propose a block on Ethereum. This explains the slot as the base clock of the consensus layer — proposer selection, the intra-slot timeline, and why a slot is not the same thing as a block.

An epoch is the fixed-length accounting period a proof-of-stake chain uses to batch its bookkeeping — committee assignment, reward settlement, and finality checkpoints. This explains what an epoch does and why Ethereum finalizes in two of them.

The state trie compresses all of Ethereum's accounts and contract storage into a single 32-byte hash in every block header. This explains how the Merkle Patricia Trie works, why it strains node hardware, and what may replace it.

A UTXO is a discrete, unspent chunk of cryptocurrency that transactions consume whole and replace with new outputs. This explains Bitcoin's accounting model, why there are no balances underneath, and where its constraints live.

Intent-based architecture lets users sign the outcome they want while competing solvers work out the execution. This explains the mechanism, where trust moves in the transaction supply chain, and what would confirm or break the design.

A trusted execution environment (TEE) is a hardware-isolated zone inside a processor where code runs shielded from the machine's own operator. This explains the mechanism, where blockchains actually use it, and what trusting the chip vendor costs.

The blockchain trilemma says a network can't maximize decentralization, security, and scalability at once. This explains why the tension is mechanical, why it's a heuristic rather than a theorem, and how modular designs try to route around it.

Modular blockchain architecture splits a chain's four core jobs — execution, ordering, data availability, settlement — across specialized layers. How the stack fits together, and why the seams between modules are where the risk lives.

EigenLayer is the protocol that turned restaking into a working security marketplace on Ethereum. How capital enters, how operator sets and unique stake bound slashing, and what the EIGEN token claims to enforce.

Restaking reuses staked ETH to secure additional systems on top of Ethereum. How the mechanism works, where the extra yield actually comes from, and what happens when slashing conditions stack on shared collateral.

Liquid staking gives you a tradeable token representing your staked position. How liquid staking tokens work, why the peg is an arbitrage outcome rather than a guarantee, and what stacks on top of ordinary staking risk.