Blockstream

Blockstream is a blockchain technology company co-founded by Adam Back in 2014. The company develops infrastructure for the Bitcoin network, including sidechains, privacy enhancements, and tools for both institutional and consumer use. It is known for its contributions to Bitcoin protocol development and its suite of Bitcoin-native financial products and services. Blockstream is headquartered in Menlo Park, California, with additional offices in Lugano and Tokyo. The company raised $210 million in a Series B round in August 2021, reaching a $3.2 billion valuation, from investors including venture capital firms Horizons Ventures and AXA Strategic Ventures. In October 2024, Blockstream raised an additional $210 million through a convertible note offering led by Fulgur Ventures, with funds earmarked for expanding its layer-2 technologies, mining operations, and bitcoin treasury.