OP_CC: A simple introspection opcode to enable cheaper consolidations

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@sipa

We can’t prevent people from reusing addresses, or otherwise leaking information. But we (we being the collective of Bitcoin users that jointly decide the system’s rules) can incentivize that behavior (through changes like the ones you propose here) or disincentivize it (through CISA, e.g., as it means CoinJoins slightly cheaper than individual transfers).

CISA incentivizes all transactions with multiple inputs. This includes transactions that do not require coordination and all inputs belong to the same user.

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OP_CC: A simple introspection opcode to enable cheaper consolidations