Blockstream's networks, languages, and tools are open source. The code is on GitHub, the APIs are public, and the block explorer is yours to query. Build on the same infrastructure we run in production.
Everything Blockstream builds for developers, each one open source and documented. Pick a layer and start.
Getting-started guides, RPC references, and protocol notes for Core Lightning, Greenlight, and the Liquid developer tools.
The Esplora REST API serves blocks, transactions, addresses, and mempool data for Bitcoin and Liquid. Public, documented, and the same one we run.
Every project is on GitHub under the Blockstream organization. Read it, fork it, build from source, and verify the claims yourself.
Blockstream has built Bitcoin infrastructure in public since 2014. The networks, the wallets, the firmware, and the research all ship as open code. Nothing here is a black box you have to trust.
See the research
The code, the APIs, and the explorer are all open. Clone a repo, query the network, and build on the infrastructure that moves Bitcoin.