(1) (One Time Programmable) Refers to programming content or logic into chips such as EPROMs and EEPROMs, which cannot be reversed. See antifuse.
(2) (One Time Pad) A cryptography method that uses a random number to generate a unique encryption key, which is stored on a smart card. See SwapCrypt.
(3) (Open Trading Protocol) A framework for Internet commerce that provides a consistent purchasing experience regardless of the hardware and software used.
(4) "On the phone." See digispeak.
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