sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<doesnt-code>
Am I correct in thinking that bitcoin is capable of advanced smart contracts by adding more opcodes to the witness script?
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<doesnt-code>
elichai2 zero knowledge proofs on chain via witness script would be a good candidate
<doesnt-code>
but perhaps not a good example because that'd likely get a direct opcode to deal with. I just mean ethereum style contracts without the state of ethereum because obviously we can't really store data in the blockhcain
<elichai2>
still haven't defined smart contracts :). there are some things you can do with bitcoin script and some things you can't. most of the actual good use cases are probably somewhat possible in bitcoin script
<doesnt-code>
well smart contracts are comprised of building block op-codes so I supposed I'd want to bring back all the bitwise opcodes, concat, and add in some more opcodes like some opcodes to deal with loops
<doesnt-code>
possibly oraclized pubkeys. if this pubkey publishes 1, I can spend these funds as well as the funds of those who bet against me.
<doesnt-code>
being able to read the state of the blockchain would be nice. what was the last block hash, what was the last transaction by this address, what block was this transaction in etc
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<sanket1729>
doesnt-code: To my understanding adding a zk verification should be possible in bitcoin script. I think something like <witness> OP_ZKPVERIFY <predicate> can work.
<sanket1729>
referring to the state of the blockchain can be possible, but it interferes with the property of re-org replaybility of transactions.
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