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Accountability in blockchain and decentralized systems is a governance framework that ensures participants are responsible for their actions, built on three core elements: transparency, responsibility allocation, and consequence management. It functions through immutable records, cryptographic verification, and smart contract execution, differing from traditional centralized systems by incorporating both technical and social dimensions rather than relying on regulatory authorities.

Ether (ETH) is the native cryptocurrency of the Ethereum blockchain network. It functions as the core economic unit of the Ethereum ecosystem, primarily used to pay transaction fees (known as "gas" fees), incentivize network validators, store value, and serve as the base monetary unit for all applications built on the Ethereum network.

Ethereum Name Service (ENS) is a distributed naming system built on the Ethereum blockchain that converts complex cryptocurrency addresses, content hashes, and metadata into human-readable names (such as "alice.eth"). Comprised of Registry and Resolver components, ENS functions as Web3 identity infrastructure, offering not only domain name resolution but also supporting digital identity representation, decentralized website access, and various other applications.

OpenSea is the world's largest non-fungible token (NFT) marketplace, established in 2017, primarily built on the Ethereum blockchain while supporting multiple networks including Polygon and Solana. As a decentralized application (dApp), it enables users to create, buy, sell, and discover various NFT assets such as digital art, collectibles, and gaming items.

A token is a digital asset built on an existing blockchain platform, created through smart contracts to represent specific rights, functions, assets, or values. Tokens can be categorized into various types, including Utility Tokens, Security Tokens, Non-Fungible Tokens (NFTs), and others, each differing in legal nature, use cases, and value representation.

Non-Fungible Tokens (NFTs) are unique digital assets built on blockchain technology, each possessing distinct identification codes and metadata that make them non-interchangeable. NFTs can represent ownership of digital art, music, in-game items, or physical assets, typically following blockchain standards such as ERC-721 or ERC-1155.