Ok now I got what you meant. thanks for the explanation.
Having said that your consideration about "on line nature" applies also to my mastercard in almost all the shops I usually buy stuff be it on line or off line. Without me providing the OTP and the payment processor verifying it I can't buy anything.
A little bit OT but worthy IMHO. There are quite a few SPV (1) client implementations that remove the need to have all the blockchain stored locally. The things are moving even further in these field with the implementation of the payment protocol (2)
Having said that your consideration about "on line nature" applies also to my mastercard in almost all the shops I usually buy stuff be it on line or off line. Without me providing the OTP and the payment processor verifying it I can't buy anything.
A little bit OT but worthy IMHO. There are quite a few SPV (1) client implementations that remove the need to have all the blockchain stored locally. The things are moving even further in these field with the implementation of the payment protocol (2)
(1) http://bitcoin.stackexchange.com/questions/4649/what-is-an-s... (2) https://github.com/bitcoin/bips/blob/master/bip-0070.mediawi...