Bitcoin transactions are highly secured and can't be tracked thus highly used in the black market.
Actually Bitcoin is 100% trackable. That's really the only way a Bitcoin "exists". Everyone agrees that it was rewarded for mining a certain block and then later transferred from one person to another (and another and another).
It's the fact that all "persons" can be 100% anonymous and there's no limit to the number of "persons" an actual human could be in the Bitcoin network combined with good old fashioned money laundering techniques that allows "untraceable" transactions.
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Actually Bitcoin is 100% trackable. That's really the only way a Bitcoin "exists". Everyone agrees that it was rewarded for mining a certain block and then later transferred from one person to another (and another and another).
It's the fact that all "persons" can be 100% anonymous and there's no limit to the number of "persons" an actual human could be in the Bitcoin network combined with good old fashioned money laundering techniques that allows "untraceable" transactions.