Where can I report bitcoin scammers? The following bitcoin addresses are involved in FRAUD...

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Where can I report bitcoin scammers?
In general bitcoin means: "if you don't own the keys, you don't own the coins" (for example web wallets or exchanges) and "if you hand over the keys (have them stolen) or sign a transaction to the wrong destination (buy a cheap iPhone from Nigeria) then you just learned a lesson the hard way".

Having said that, Bitcoin does offer some unique protection methods like multisignature and wallet backups.

Depending on the situation and the kind of fraud, you might be able to contact your local law enforcement or FBI or equivalent.