In Bitcoin transactions, the opcode OP_PUSHDATA4 is used for the RIPEMD 160 hash of a key. In name operation scripts like
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OP_NAME_FIRSTUPDATE <identifier> <rand> <value> OP_2DROP OP_2DROP OP_DUP OP_HASH160 <Hash160> OP_EQUALVERIFY OP_CHECKSIG
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OP_NAME_UPDATE <identifier> <value> OP_2DROP OP_DROP OP_DUP OP_HASH160 <Hash160> OP_EQUALVERIFY OP_CHECKSIG