A programmer who took simply more than $600m (£433m) worth of digital currency was offered $500,000 and invulnerability as an award for returning the cash.
Poly Organization made the questionable proposal after the programmer vowed to send back the cash.
The assault was revealed on Tuesday when Poly Organization openly begged the programmer to help.
One previous FBI official said "privately owned businesses have no position to guarantee insusceptibility from criminal indictment".
The assault is one of the biggest hacking heists ever. Poly Organization said the individual had taken advantage of a weakness in its framework.
The vast majority of the cash has now been offered in return, albeit the programmer says they are not keen on the award.
Soon after the hack the unknown individual presented notes on the freely accessible blockchain provoking the organization and requesting exhortation on the most proficient method to wash his taken wealth.
Afterward, the criminal guaranteed "not to be keen on cash" and vowed to return everything.
* Digital currency heist programmer returns $260m in reserves
* Programmers take $600m in significant digital currency heist
By Thursday evening, Poly Organization said the vast majority of the excess resources in the programmer's ownership had been moved to a computerized wallet constrained by both the programmer and the organization.
Poly Organization says it is as yet hanging tight for the reimbursement cycle to be completely finished yet that it is working with the programmer.
A piece of the taken coins were frozen soon after the assault have not yet been moved yet can't be utilized by the programmer at any rate.
"The programmer actually holds $33.4m of taken Tie [tokens] - on the grounds that it has been frozen by Tie themselves," Tom Robinson, fellow benefactor of Elliptic, a London-based blockchain investigation and consistence firm, told the BBC.
He added that it very well may be seen on the blockchain that "a couple thousand dollars of different tokens" were being clutched by the programmer.
It was not satisfactory, nonetheless, in case these were essential for the taken resources, or gifts that the programmer mentioned individuals to send them on Thursday as a thank you for returning the cash.
Other cash remarkable likewise incorporates a 13.37 Ether tip ($40,000), which the programmer shipped off a client who cautioned them that the Tie tokens had been frozen by its designer.
In a three page questions and answers posted online the unknown programmer guaranteed the person completed the heist for no particular reason and to empower cryptographic money trade firm Poly Organizations to work on its security.
Poly Organization seems to have acknowledged the clarification and named the programmer "Mr White Cap".
White cap programmers are moral security scientists who utilize their abilities for great to help associations discover security imperfections.
Poly Organization affirmed that it sent a note to the assault saying "we accept that your activity is white cap conduct, we intend to offer you a $500,000" reward.
The firm added: "We guarantee you that you won't be responsible for this occurrence."
The supposed move has incensed some in the security world who are concerned that it may start a trend for criminal programmers to white-wash their activities.
Katie Paxton-Dread, a white cap programmer and teacher at Manchester Metropolitan College, says that "naming this hack as white cap is very baffling".
Mrs Paxton-Dread has found more than 30 weaknesses in associations going from the US Division of Safeguard (DoD) to Verizon Media.
"White cap hacking is tied in with having a degree, not contacting a few frameworks, working with the group, composing proficient reports enumerating our discoveries, not going farther than we need to exhibit hazard," she said.
"Our methodology is 'first, do no mischief', possibly confirming fixes are set up and not putting any clients information in danger."
Charlie Steele, Accomplice at Legal Danger Partnership and previous Branch of Equity and FBI official is additionally worried about the supposed proposal from Poly Organization.
"Privately owned businesses have no position to guarantee resistance from criminal arraignment," he told the BBC.
He added: "In this occasion where a programmer took the $600m 'for entertainment only' and afterward returned the vast majority of it, all while staying unknown, isn't probably going to decrease controllers' interests about the assortment of dangers presented by digital currencies."