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A Scene at my local grocery:
me: let me pay for my milk with bitcoin here
cash register person: Hmm...OK
me: I scanned my bar code, so it is done
cash register person: i don't see a confirmation
me: let's wait a little
people in line: grumble, grumble, grumble
cash register person: Mr, please stay aside
me, 13 min later: what's the heck...forget about it...here is $5
me: let me pay for my milk with bitcoin here
cash register person: Hmm...OK
me: I scanned my bar code, so it is done
cash register person: i don't see a confirmation
me: let's wait a little
people in line: grumble, grumble, grumble
cash register person: Mr, please stay aside
me, 13 min later: what's the heck...forget about it...here is $5
Oh Please ... always the same excuse.
In the real world, no seller wait a confirmation with things bellow 200 USD ...
double-spend is not possible when you don't use the blockchain.info junk blockchain reader that it displays transactions that they don't exist in the MEMPOOL.
In French forum, the majority of (wrong) falses transactions (too low fees) is because noobs use blockchain.info to see if transaction exist.
comme tout holder, on indique la direction ... mais on laisse les autres aller vérifier. 
