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BIP 341 specifies constraints on the size of the control block _c_ used to compute the taproot merkle root. > The last stack element is called the control block _c_, and must have > length _33 + 32m_, for a value of m that is an integer between 0 and > 128, inclusive. Fail if it does not have such a length. (See BIP-341 "Script Validation Rules" here: https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#script-validation-rules)