The chief executives of six major bitcoin exchanges and businesses pledged a coordinated efforts to assure customers of the security of their funds in response to mounting concern about the future of Japan-based exchange Mt. Gox.

Meanwhile, on Tuesday, the Mt. Gox website became unavailable, with the homepage appearing to have been deleted. Attempts to reach Mt. Gox's offices in Tokyo by phone and email were unsuccessful.

In statements released on their various corporate websites, the CEOs of the firms—exchanges Bitstamp, BTC China and Kraken, as well as broker and payment processor Coinbase, wallet provider Blockchain.info and payment firm Circle Internet Financia—sought to separate concern about Mt. Gox, where an ongoing freeze on bitcoin withdrawals has stoked fears of bankruptcy, from those in the broader bitcoin community.

"This tragic violation of the trust of users of Mt. Gox was the result of one company's actions and does not reflect the resilience or value of bitcoin and the digital currency industry," the statement said. "There are hundreds of trustworthy and responsible companies involved in bitcoin. These companies will continue to build the future of money by making bitcoin more secure and easy to use for consumers and merchants. As with any new industry, there are certain bad actors that need to be weeded out, and that is what we are seeing today."

"In order to re-establish the trust squandered by the failings of Mt. Gox, responsible bitcoin exchanges are working together and are committed to the future of bitcoin and the security of all customer funds" the business leaders said. "As part of the effort to reassure customers, the following services will be coordinating efforts over the coming days to publicly reassure customers and the general public that all funds continue to be held in a safe and secure manner: Coinbase, Kraken, BitStamp, Circle, and BTC China.