Small but complete, wild and resilient.
Pure proof-of-work. No pre-mine. No founders' fee.
A sparrow is small — yet it navigates the world with instinct and precision. It survives winters that fell larger creatures. It builds with what it has.
SPW is built on the same philosophy. No bloated VM, no governance tokens, no venture capital. Just a clean proof-of-work blockchain with honest rules and a supply cap of 21,000,000 SPW.
1 SPW = 100,000,000 feathers. Halvings every 210,000 blocks. The chain started with 50 SPW per block — the same trajectory as the original vision.
SPW · SPARROW
Every design decision favours simplicity, honesty, and longevity.
SHA-256d PoW with automatic difficulty adjustment every 2,016 blocks. Anyone can mine — CPU, GPU, or ASIC. No shortcuts, no stake.
Bitcoin-style unspent transaction outputs. Clean, auditable, and resistant to double-spend. No global state, no hidden complexity.
Minimum fee of 0.0001 SPW per transaction. Miners collect fees as an incentive. Cheap to use, sustainable to run.
Designed for a single server with ~100 GB disk. Lean SQLite storage with WAL mode. The full history stays manageable for life.
Simple JSON API for balances, UTXOs, transactions, blocks, and broadcasting. No SDK required — any HTTP client works.
Keys generated and transactions signed entirely in your browser. Your private key never leaves your device. No extension needed.
Everything you need to know about the protocol.
Anyone can mine SPW. All you need is a server and Python 3.10+.
Pull the full node software from the repository onto your server. Python 3.10+ required.
Generate a new SPW wallet address. Mining rewards will be sent here every block you find.
Launch the node with your wallet. It syncs the chain and begins mining automatically.
Every block you find earns you the block reward plus all transaction fees in that block.
The SPW web wallet runs entirely in your browser. Keys are generated locally using secp256k1 — the same curve as Bitcoin. Nothing is ever sent to a server.
Where we've been, where we're going.
PoW chain, UTXO model, Merkle tree, difficulty adjustment, block halving logic.
Minimum-fee enforcement, fee collection by miners, CLI send with fee support.
Full JSON REST API. Browser wallet with in-browser key generation and signing.
Official website live. Mainnet running.
Peer discovery, block propagation, transaction relay. Multiple independent nodes.
Full-featured public explorer at explorer.spw.network.
Stratum-compatible pool support so miners can work together.
Atomic swap support for peer-to-peer trading without a trusted intermediary.