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Blockchain Glossary

Explain addresses, gas, transaction hashes, EVM, Layer 2, DApps and approvals in practical context.

Address
A public identifier for an on-chain account used to receive assets.
Seed phrase
Recovery information that can restore wallet control and should be kept offline.
Private key
Sensitive key material directly related to account control.
Gas
A measure of computational resources used by transactions or contract execution.
Transaction hash
A unique identifier used to locate an on-chain transaction.
EVM
An Ethereum-compatible smart-contract execution environment.
Layer 2
A scaling network that processes activity outside mainnet while maintaining a settlement relationship.
DApp
An application that uses blockchain accounts, signatures or smart contracts.
Approval
An on-chain permission allowing a specified spender to use tokens.

Keep network context when using a glossary

Every on-chain action has context: the network, account, contract call, permission target and fee. If one of those changes, repeat the checks instead of assuming the previous decision still applies.