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Signet
BIP 325, default signet, global signet, custom signet, signet test network
Bitcoin’s signed test network, defined by BIP 325, for more predictable multi-party testing than testnet.
Signet is a Bitcoin test network defined by BIP 325. In addition to proof of work, each block must satisfy a challenge chosen for that signet. That extra rule lets operators coordinate block production, planned reorgs, and other test conditions much more predictably than on testnet.
The public default signet is the network most developers mean when they say signet. Bitcoin Core supports it directly, and anyone can also launch a custom signet with a different challenge and seed nodes. That makes signet useful for wallet testing, integration testing between independent services, and protocol experiments that need a shared network without the chaos of testnet.
Signet sits between testnet and regtest. Testnet is open and often unstable. Regtest is fully local and easy to control. Signet gives multiple independent parties a shared environment with controlled unreliability, which is why teams use it to rehearse software changes before mainnet.