According to Dan Held, Blockstream's 2015 presentation on DeFi for Bitcoin introduced the concept of sidechains, which enables the creation of decentralized financial applications on the Bitcoin network (source: @danheld via Twitter, May 2, 2025). This early exploration of sidechain technology is significant for traders as it laid the groundwork for current developments in Bitcoin DeFi infrastructure, offering new trading products and services such as wrapped assets and cross-chain functionality. The historical context provided by Blockstream's approach can guide traders in tracking emerging Bitcoin DeFi tokens and protocols that leverage sidechain solutions, potentially impacting liquidity and trading volumes.