DoubleZero is a decentralised network layer that moves data for distributed systems over contributor-provided private links to reduce latency and jitter versus the public internet. The network uses a two-ring model: an outer ring that performs non-discretionary edge filtration (e.g., deduplication and spam removal) at contributor hardware, and an inner ring that carries validated traffic across an optimised mesh of contributor links. Contributors interconnect at DoubleZero Exchanges (DZX) in major metropolitan areas, enabling a contiguous mesh. Admission for users is tied to on-chain identities (initially Solana), and the client supports IBRL mode (route over DoubleZero when available with public-internet fallback) and multicast for publisher/subscriber workflows. Link and performance telemetry is recorded on a dedicated ledger to coordinate routing and economic flows. Initial users include validator clients as well as RPC and MEV/searcher infrastructure.