Blockstream is a Bitcoin-focused technology company founded in 2014 that has become one of the most influential commercial entities in Bitcoin infrastructure and protocol development. The company was founded on the premise that Bitcoin's future would be built through sidechains -- parallel blockchains that can interoperate with Bitcoin while enabling new features without changing the base protocol.
History and Founding
Blockstream was co-founded by Adam Back alongside Austin Hill, Greg Maxwell, Pieter Wuille, and others in 2014. The timing coincided with the publication of the "Enabling Blockchain Innovations with Pegged Sidechains" whitepaper, a foundational document that laid out the technical case for sidechains and established much of Blockstream's initial research agenda.
Adam Back's background gave the company immediate credibility. As the inventor of Hashcash, the proof-of-work system cited directly in the Bitcoin whitepaper, Back brought deep cryptographic expertise and a genuine cypherpunk heritage to the enterprise. The company raised approximately $21 million in its initial funding round, followed by a $55 million Series A in 2016, and a $210 million round in 2021 that valued the company at $3.2 billion.
Key Products and Initiatives
Liquid Network
Blockstream's most significant commercial product is the Liquid Network, a federated Bitcoin sidechain designed for exchanges and financial institutions. Liquid enables fast, confidential transactions between member exchanges, reducing settlement times from hours to approximately two minutes. Liquid also supports the issuance of tokenized assets, including the Liquid Bitcoin (L-BTC) wrapped asset.
Blockstream Satellite
Blockstream Satellite broadcasts the Bitcoin blockchain from space via a network of geosynchronous satellites, enabling nodes in areas with limited internet connectivity to receive Bitcoin data. The service operates globally and is available free of charge, reinforcing Bitcoin's censorship-resistant properties.
Core Lightning
The company develops Core Lightning (formerly c-lightning), one of the three primary Lightning Network implementations, written in C for performance and minimal resource usage.
Green Wallet and Mining
Blockstream maintains the Green Wallet, a Bitcoin wallet with multi-signature security features. The company also operates large-scale Bitcoin mining facilities and sells mining hardware and colocation services through its Blockstream Mining division.
Developer Contributions
Several of Blockstream's employees have been among the most prolific contributors to Bitcoin Core. The company has funded full-time development work on the base protocol, including work on Taproot, Schnorr signatures, and Miniscript. Pieter Wuille, in particular, is one of the most important Bitcoin Core contributors in history. This has made Blockstream a significant patron of Bitcoin Core development, though this arrangement has also drawn criticism from those concerned about corporate influence on an open-source project.
Significance
Blockstream has shaped Bitcoin infrastructure more than almost any other private company. Its simultaneous contributions to base layer protocol research, layer-two infrastructure, and commercial Bitcoin products make it a central node in the broader ecosystem. The company's bet on sidechains and the Lightning Network as scaling approaches -- rather than increasing Bitcoin's block size -- placed it firmly in the camp that prevailed during the blocksize wars of 2015-2017.
External Links
- Blockstream Official Website
- Blockstream on Wikipedia
- Core Lightning on GitHub
- Liquid Network
- Blockstream Satellite
- Adam Back on Twitter/X
References
- Adam Back -- co-founder and CEO
- Bitcoin Core -- project to which Blockstream employees contribute
- Lightning Network -- Layer 2 protocol; Blockstream maintains Core Lightning
- The Blocksize War -- documents the scaling debate in which Blockstream was central
- Lightning Labs -- company behind the competing LND implementation
- Bitcoin Whitepaper -- cites Adam Back's Hashcash
- Elizabeth Stark -- Lightning Labs CEO building complementary infrastructure