Chains
Every page in the DeFi section assumes a chain underneath it, and most assume Ethereum. This section holds the specific chains and storage networks the wiki covers — a section or a page each — and the property each was chosen for. What a chain is in general, the ledger and the accounts and the transactions, is Blockchain; this section is the instances.
Ethereum is the reference implementation of a programmable blockchain and the platform the rest of the section assumes. Its own section covers the improvement-proposal process and the token standards that came out of it, from the fungible-token interface every wallet reads to the vault and agent standards built on top. The others here were each chosen for one property: Sui for object-centric throughput, IOTA for machine-to-machine transfer, feeless in its original design, and Sapphire for a confidential Ethereum-compatible chain where contract state and calldata are encrypted inside a hardware enclave.
Arweave and Filecoin are two answers to decentralized storage. Arweave prices it as an endowment — pay once, store forever. Filecoin prices it as a dated contract with recurring proofs that the bytes are still there. The addressing scheme both build on is content addressing, which sits under Computer Science because the durable idea is the address, not the storage market.