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Such addresses are called “ provably unspendable ,” meaning that you can prove beyond all doubt that no one ever can transfer a single sathoshi out from them. In this example, we will be creating a so-called P2SH address, in which “SH” means “script hash.” Keep in mind that every bitcoin address is, in fact, a wrapped script, and for its owner to spend from it, he or she must create a valid transaction from it.