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Did you read BIP 16?
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So there is no manipulation allowed AT ALL.
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A maximum of 1,000 "naked" OP_CHECKMULTISIG operations are allowed in the scriptSigs and scriptPubKeys of transactions in any given block.
We had a block earlier this month with 1,8000 scriptSigs, so I think we are uncomfortably close to that limit.
BIP 16 "hides" the CHECKMULTISIGS in the serialized script, so more of them are allowed.
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At the very least BIP 17 is harder to test-- Luke had to test on the main network because I was naughty and wrote and ran a BIP-17-transaction-stealing bot (sorry, I couldn't resist).
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I have zero commercial interest; I am not being paid by anybody for anything right now.