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4My definition of web3 from a technical perspective is that it is composed of <mark>self-verifying data structures, cryptography, and distributed systems</mark>.
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6These are all active areas of research in computer science and information theory.
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8Aside from technology, Web3 supports user ownership, data portability, open source, and public goods.
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10The [[DWeb]] Principles are a good background.
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12Some of the ways of working look a lot like my [[Three Definitions of Open Source]].
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14Not all web3 has to be available under an open source license. Most often, I expect a Web3 system to be based on a protocol or standard, that can have multiple code implementations that interoperate by following the protocol.
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16Some examples of Web3 systems:
17* [[ATProtocol]], with [[Bluesky]] as an implementation
18* [[ActivityPub]], with [[Mastodon]] as an implementation
19* [[IPFS]], with [[Kubo]] as an implementation
20* [[Farcaster]], with [[Warpcast]] as a client
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22## Blockchain
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24Blockchains are a subset of web3. They are useful in cases where strict global consensus is required.