Thank you Gregory Maxwell and Mike Hearn for your comments! Your bitcoin thoughts (in general) are truly insightful! And, Mike, your forum "outreach" to help pe

Thank you Gregory Maxwell and Mike Hearn for your comments! Your bitcoin thoughts (in general) are truly insightful! And, Mike, your forum "outreach" to help people understand bitcoin better is also to be commended. As a general PSA, I recommend to everybody interested in bitcoin to read the comments of mike_hearn in this thread; he (and the other core devs) spend a lot of time explaining non-intuitive aspects of bitcoin. PS. Mike, do you have a centralized source for your comments? Between G+, medium, bitcointalk, ad-hoc videos, etc. it's hard to keep track. Gregory, my only data point for a 'merchant' accepting txns which have zero conf WITH widespread network propagation (say, >70%) is blockchain.info's now-defunct laundry service. 0conf w/o net. prop. was never accepted, 0conf w/ net. prop. was accepted for 'small' amounts, 1 conf for med amounts, 2 conf for large amounts, and 3 conf for extra large amounts. Anyway, you knew all this better than I did, but you asked so here you go. Thank you for explaining the greedy-miner strategy for safe confirmations. The problem I see with that, is the merchant needs a fast connection to "destroy" the transaction in time.