"If 5% of people use Payjoin, the Common Input Ownership Heuristic becomes worthless" nostr:nprofile1qyv8wumn8ghj7mn0wd68ytn90p68yctzd968xtnfduq3jamnwvaz7tmwdaehgu3wwpskcctwv35jucmvda6kgqpqt289s8ck5qf...