Sam Bankman-Fried, former chief executive of collapsed cryptocurrency exchange FTX, apologized Wednesday in an interview for a "lot of mistakes" just after the abrupt crash and bankruptcy of the firm, saying he did not knowingly behave fraudulently.

"I didn't ever try to commit fraud on anyone," Bankman-Fried told the Dealbook conference hosted by CNBC and The New York Times.

"I'm deeply sorry about what happened," Bankman-Fried said. "Clearly I made a lot of mistakes or things I would be able to give anything to be able to do over again."

Bankman-Fried, appearing by video from the Bahamas and donning his trademark T-shirt, said he was "shocked" by many of the details that have surfaced amid the cryptocurrency platform's collapse, depicting the problems as stemming from lax oversight and corporate controls rather than an intent to defraud.

On Nov. 11, Bankman-Fried resigned as FTX filed for bankruptcy protection while facing a large financing shortfall and a deluge of withdrawals from panicked customers. The firm at its peak had been worth some $32 billion.

At the time, FTX had taken some $10 billion in customer funds without authorization, according to the Wall Street Journal.

Much attention has focused on the relationship between FTX and Alameda Research, an affiliated trading firm.

Bankman-Fried acknowledged an "embarrassing" lack of attention to conflicts of interest between the two firms, but insisted that he was not abreast of the details on Alameda and did not run Alameda.

Thought no 'existential' risk

Among the revelations, the digital currency news site CoinDesk reported on Nov. 2 that Alameda's balance sheet was heavily built on FTT – a token created by FTX and not based on an asset with independent value.

The value of FTT plunged in early November as both Alameda and FTX cratered and has not recovered.

Bankman-Fried said that he was also surprised at the scale of Alameda's positions on FTX that were troubled and which ultimately stressed the firm.

"I didn't think it was existential for FTX," Bankman-Fried said of Alameda's financial stress, adding that he thought the problem would "end up having some small impact on FTX, but not a significant one, not one that hurt customers at all."

Bankman-Fried said he didn't knowingly "comingle" funds between the two firms.

FTX's newly installed CEO John J. Ray has lambasted his predecessors in a Nov. 17 filing in bankruptcy court.

"Never in my career have I seen such a complete failure of corporate controls and such a complete absence of trustworthy financial information as occurred here," Ray said in the filing.

"From compromised systems integrity and faulty regulatory oversight abroad, to the concentration of control in the hands of a very small group of inexperienced, unsophisticated and potentially compromised individuals, this situation is unprecedented," he said.

Bankman-Fried on Wednesday said he was not aware that he was the subject of a criminal probe, adding that he rejected his lawyer's advice to stay silent now.

"I have a duty to explain what happened," he said. "And I think I have a duty ... if there is anything I can do to try and help customers out here."

Bankman-Fried suggested U.S. investors in FTX could recover their losses but did not explain how this might happen.