Chains whose next block is chosen by proving reserved disk space — a "plot" laid down in advance, then queried against a challenge. Energy cost is closer to a running hard drive than a running ASIC; the collateral is storage rather than staked coin or burned electricity.
| Who makes a block | A farmer whose stored plot holds the best answer to a random challenge. |
|---|---|
| Who may take part | Anyone with disk space. The plot is written once and then only read. |
| How the chain agrees | The chain with the best proofs wins. Chia adds a verifiable delay function, proof of time, between blocks; Filecoin's Expected Consensus elects several leaders a round, weighted by the storage each proves. |
| When a block is final | After a number of blocks, as with work. |
| What an attack costs | Most of the storage committed to the network. |
| # | Asset | Consensus | Market cap |
|---|---|---|---|
| 32 | FilecoinFIL | PoRep + PoSt (Expected Consensus) | $747M |
| 50 | ArweaveAR | SPoRA (proof of access) | $228M |
| 118 | ChiaXCH | Proof of Space and Time | $24M |
| 304 | FruitsFRTS | Proof of Capacity | $86,416 |
| 356 | SpacemeshSMH | Proof of Space-Time (PoST) | $0 |
Methodology — the rules under which each chain's family was decided. Wrapped, staked and pegged claims are listed separately and never counted toward this total.