According to @BitMEXResearch, the first debate over arbitrary data in the Bitcoin blockchain occurred in December 2010 with Satoshi Nakamoto participating (source: @BitMEXResearch, X, Sep 29, 2025). On December 8, 2010, Satoshi released Bitcoin v0.3.18 that added a standardness check so nodes only included known transaction types (source: @BitMEXResearch, X, Sep 29, 2025).