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Why would any country want to adopt Bitcoin? What incentive does any country have to do such a thing?

A country would be more likely to introduce a Chaum-style digital cash system, where the government would act as an issuing authority for digital cash tokens.

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Relevant: The Royal Canadian Mint recently invented MintChip, a fully digital crypto-currency where private keys are stored in integrated circuit chips in micro sd cards (for smartphones/tablets) and USB dongles (for computers).

They say it is able to be exchanged online AND offline fully anonymously. The details on that are yet to be released.

This makes Canada the first country in the world to explore a fully electronic currency.

http://mintchipchallenge.com/

http://en.wikipedia.org/wiki/MintChip

They might adopt it if it's more stable than their currency, like how Ecuador uses the US dollar.

Perhaps, but it would have to be adopted side-by-side with a currency that can be used (securely) for offline transactions. Why do that, when you could just adopt one currency that can be used both offline and online (especially since you can deploy a digital cash protocol for any currency, and thus you only really need one that is useful for offline payments)?

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