Some companies contacted me. They claim they Can track Bitcoin movement and trace scammers to claim money back. They want to be paid in advance. Is it possible?
Bitcoin transaction can be tracked but can not be reversed, which means your money is completely gone, you need to forget about it and move on. There are many people that recovery services have scammed, recovery services are scammers too.
Please refer to this topic
https://bitcointalk.org/index.php?topic=5264627.0In summary, he was scammed twice. First was when he sent bitcoins to a ponzi scheme and second was when he paid a bitcoin recovery scam service in an attempt to get back his bitcoins from the ponzi.
The story may sound ridiculous but it happens to many beginners. Some newbies still fall for different types of scams like fake giveaways and bitcoin doublers. Another example is the recent hack on twitter, the scammers used the accounts of famous people to fool followers. If not for Coinbase, 1,000 more users would have fallen victim. They stopped the $280,000 worth of btc transactions from being deposited into the scammer's account.
Coinbase says it prevented just over 1,000 customers from sending around $280,000 worth of bitcoin during last Wednesday’s attack. Roughly 14 Coinbase users sent around $3,000 worth of bitcoin to the scam’s bitcoin address before the company moved to blacklist it, the company said.
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https://www.theverge.com/2020/7/20/21331499/coinbase-twitter-hack-elon-musk-bill-gates-joe-biden-bitcoin-scamIf you or someone else you know fell victim to these scams, please be informed that the btc sent to scammers are most likely unrecoverable. If you ever encounter a site that says they'll get it back for you at a fee, do not fall for it because they are also scams. Bitcoin transactions cannot be reversed and the only possible way I know to recover the funds is if the scammer themselves are careless in sending btc to centralized exchanges or services without obfuscating the transaction.