I believe employees in all countries would have this type of investment plan in a way there would be companies rendering services in which the employee would be saving 10% or more of his/her salary into retirement account. This type of investment would be tax free and I believe this is how it supposed to work in all countries. Normally, people save fiats into retirement account, and as we know that fiats are fully vulnerable to governmental manipulations which can result to fiats value depreciation/devaluation.

Bitcoin has two major advantages:

1. Privacy, in a way we can save our bitcoin unknown to theives if all creteria for safety is considered and applied.
2. Appreciative money or asset that is not at all in any form vulnerable to central authority manipulations, and completely decentralized.

Some organizations are offering this type of service now in which you can be able to save usually 10% or more of your earnings into the retirement account, some other cryptocurrencies are also offered like ether, litecoin and bitcoin cash. I believe this type of bitcoin investment plan lacks privacy, but I think it is cool as the fiat paid lacks privacy already but the main advantage is that bitcoin being a deflationary currency will be best for this kind of account unlike fiats that will still depreciate over long time period, bitcoin will only appreciate (increase in price over a long time period.

What do you people think about bitcoin retirement accounts?

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Although, we should still remember that bitcoin is meant to be a privacy coin, not your private key not your bitcoin.