[Bitcoin Pioneer Adam Back Faces Challenges: BSTR Required to Pay $15 Million Breakup Fee] According to Bloomberg, Bitcoin pioneer and Blockstream co-founder Adam Back has recently faced setbacks in several Bitcoin-related ventures: the Bitcoin vault project BSTR Holdings, which he spearheaded, had its merger deal with Cantor Fitzgerald's SPAC terminated, and BSTR was required to pay a $15 million breakup fee; the Bitcoin mining business Blockstream Mining, which he co-founded and holds a minority stake in, encountered multiple lawsuits after being spun off from Blockstream and partnering with Exacore, accused of owing payments for equipment, electricity, and customer deposits, with related financing totaling approximately $2 billion; meanwhile, the Bitcoin sidechain Liquid initiated by Blockstream...