Uses of Bitcoin digital good cryptographic key pair certificates - Top 3 list

[cloud9]

1.  Globalised, decentralised, secure accounting system
2.  Sending encrypted messages publicly VERY securely to anyone you shared your wallet.dat file with (you both have the public and private key) for the value of potentially only 0.00000001 btc each (excluding transaction costs - because no transaction happens over the bitcoin network) - much cheaper than a one time pad - What would be the value of that?!?
3.  Security applications where strong passwords are required - one 0.00000001 btc can be used only once and then the next in a the wallet.dat file for the next login!

and more

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[TKE406]

Number one is most useful. Governments and institutions can be forced to implement such ideas to prevent fraud, laundering, and other financial crimes by people who can do the most damage (CEOs, Politicians, Military Generals, other "higher up" people who tend to get bought off.