Blockchain 3.0 is an informal label for blockchain designs that aim to fix the problems of the first two generations, particularly slow speeds, high fees, poor interoperability and difficult user experience. Projects described this way often use proof of stake, sharding, layer 2 networks or new consensus methods, and many claim to address the blockchain trilemma. Networks such as Cardano, Polkadot and Solana have been marketed under this heading at various times. Unlike Blockchain 1.0 and Blockchain 2.0, there is little agreement on what counts as the third generation, and the label is used heavily in marketing, so readers should judge each project on its actual design and record rather than on the name. Also see Bitcoin 3.0.
Last updated 13 Nov 2026