From what I recall, wasn't Lauda paid 1 BTC from the bitfinex hacker dude?

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This is Lauda from bitcointalk.org  (uid=101872), using the PGP Fingerprint CBB8 39C0 188B ADE8 A80C  90B2 F4E3 AD3C 52F9 9ADB as staked here: https://bt.irlbtc.com/view/1159946.msg16464161#msg16464161.

Today is the 20th of January 2017. I, and a group of coin collectors have been running a deep investigation on the user Zeroxal due to his unusual behaviour regarding the acquisition and origin of funds that he has recently admitted to being in control of.
As a part of this investigation, I have created an agreement with the user Tman to send an 'extortion' message to Zeroxal requesting that they come clean, and send me a 'stake' in order to keep me silent. The agreement stated that the message should only be sent should we proceed to hand Zeroxal and all the information to the relevant authorities. The sole purpose of this action was never to acquire money, but rather to trap Zeroxal into reveal the final evidence required in order build a proper case against him.

Should any funds be acquired via this message, a mutual agreement will be made amongst the 'investigators' as to what shall be done with the funds. Under no circumstances will Lauda (or any other user) use these funds for personal gain. In the case of the required information not being rehanded over to the other investigators, the public and/or proper authorities when required, the user Lauda will be guilty of voiding the agreement with Tman and other investigators. By extension, they will therefore be guilty of extortion.

This message is timestamped via the last mined block (449202) at the time of encryption, carrying the hash:
00000000000000000236fa4d0cbc867afd83119547d461c29fbce68d28e81645

He refuses to give ma a valid explanation and claims me being a criminal without any proof.

I hereby state as well, the above is all true, as I have seen both the pgp and the evidence. Thank you.

I hereby confirm the same.

Thanks

Even if this kind of extortion was done and sanctioned by law enforcement the evidence of payment would mean nothing and those doing the extortion would be guilty of extortion. Also any other evidence collected by these agents would probably be inadmissible.

Just because you are doing an investigation does not allow you to extort a suspected criminal. Telling others about an extortion attempt in advance doesn't remove criminal liability, it only potentially adds a potential conspiracy charge.

Only if they gained the evidence through the extortion attempt (if it's not sanctioned). Evidence gained through 'regular' investigation wouldn't be voided. In the case of Zeroxal it's safe to say that there is plenty of evidence......