Why is a list of the hostages a roadblock in the Israel-Hamas ceasefire?

From CBC News.

Israeli Prime Minister Benjamin Netanyahu is warning that a ceasefire can’t go forward on Sunday unless Israel receives the list of names of hostages to be released from Gaza as agreed. David Des Roches, an associate professor at the Middle East Institute in Washington, D.C., says one of the reasons might be due to the specific ratios in the exchange of Palestinian detainees and Israeli hostages.

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