If only there were some kind of immutable public ledger I could store information on...
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d894bd6f1f8222ceb5101cc1d5d3f3eb326e04ce6b9567f74cca151bb2b7b927
d894bd6f1f8222ceb5101cc1d5d3f3eb326e04ce6b9567f74cca151bb2b7b927
OP_
OP_
OP_NOTIF
OP_15
[OP_CHECKMULTISIG | OP_CHECKMULTISIGVERIFY]
OP_ENDIF
OP_DUP
OP_NOTIF
OP_15
OP_CHECKMULTISIG
OP_ENDIF
[Consider the script "OP_0 OP_IF OP_15 OP_CHECKMULTISIG OP_ENDIF OP_1", e.g.
see 3PxwzLuPZtgHuz2J9ocg6ejNcci5WbtS3h
This script is 6 bytes and "consumes" 15 sigops if I am not mistaken. An
attacker can use this to fill the block sigop limit of 20000. E.g. See
6766e75d6166a0a14bd814921d0f903285e15779e648d7ec52a4f7c0868ec07d (225 sigops
in ~740 bytes). An attacker spends just 0.04BTC ($10.70) to "fill" a block
with high-fee transactions.
reddit.com/u/basil00
salt: 3md9smcjd7jkafh83mdlsjc9w,03m
]
/** The maximum allowed size for a serialized block, in bytes (network rule) */
static const unsigned int MAX_BLOCK_SIZE = 1000000;
/** The maximum allowed number of signature check operations in a block (network rule) */
static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
if (fStrictPayToScriptHash)
{
// Add in sigops done by pay-to-script-hash inputs;
// this is to prevent a "rogue miner" from creating
// an incredibly-expensive-to-validate block.
nSigOps += GetP2SHSigOpCount(tx, view);
if (nSigOps > MAX_BLOCK_SIGOPS)
return state.DoS(100, error("ConnectBlock(): too many sigops"),
REJECT_INVALID, "bad-blk-sigops");
}
OP_0
OP_IF
OP_15
OP_CHECKMULTISIG
OP_ENDIF
OP_SMALLINTEGER