Which merchants currently accept your key for instant confirmations?
From the bitcoin wiki:
[green addresses] are generally considered a bad idea and not advisable to implement.
There's also other users that can check either inside the GreenAddress wallet or at https://greenaddress.it/instant
it's called GreenAddress because when I thought about the concept, end of 2012 beginning of 2013 it wasn't yet associated with the bad reputation or MtGox double spends and I felt anyhow that it could be improved (which I think we did).
The modus operandi of the platform is different from the original GreenAddress concept as the instant confirmation comes out of band and is based on multisignature allowing the system to prevent users double spends.
However, like the original GreenAddress concept, it is based on third party trust, there is no magic bullet.
Also, does this mean that to verify a transaction can be considered instant, the merchant has to check with your servers and there is no way of verifying this independently? Isn't this a serious privacy problem?
The minimum is 1 day or 144 blocks, default to 90 days, max is max block size.
probably that is the right step toward solving the transaction speed,albeit by a slightly more centralized workaround,it reminds me of a comment I made almost a year from now:
https://news.ycombinator.com/item?id=6130813
great job ;)