A hack involving a Bitcoin wallet tool has sent digital-asset investigators into an around-the-clock search for answers. Bloomberg reported that the specialists examining the incident have been working with little rest as they try to establish what happened.

The episode is especially sensitive because the tool had been treated as a safe way to hold Bitcoin. A related report described the breach as a test of faith for users who had trusted that approach, shifting attention from Bitcoin’s market price to the security of the wallet used to control it.

The wallet maker has declined to estimate the amount lost. That leaves the financial scale of the incident unresolved while investigators continue their work and the breach draws wider attention across the cryptocurrency sector.

Another Bloomberg report said the attack bolstered the case for spot Bitcoin exchange-traded funds. The comparison now running through the coverage is between holding Bitcoin through a personal wallet tool and gaining price exposure through an exchange-traded product. The reports do not resolve that choice, but the hack has made wallet security central to it.