Data that can't be changed once written. Blockchain transactions are immutable because altering one block would require redoing every subsequent block. This permanence is a feature, not a bug, though it means mistakes are permanent too.
A distributed database where transactions are grouped into blocks and linked together cryptographically.
Not controlled by any single entity, authority, or server.
Application Binary Interface.
A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.
The Ethereum standard for account abstraction without changing the core protocol.
The way Ethereum and many other chains track balances.
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