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While reading BIP 65 it says that op_checklocktimeverify can be used to create provably spendable outputs by anyone. How is this possible?

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Start by reading the whole sentence:

CHECKLOCKTIMEVERIFY can be used to create outputs that are provably spendable by anyone (thus to mining fees assuming miners behave optimally and rationally) but only at a time sufficiently far into the future that large miners can't profitably sell the sacrifices at a discount.

In other words, CLTV is used to delay when an output can be spent, not to make it provably spendable by anyone. The latter is trivial: just don't have any signature checking operations in a script.

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