You can get the same effect with OP_CHECKBLOCKATHEIGHT as proposed by Luke Dashjr (https://github.com/luke-jr/bips/blob/bip-cbah/bip-cbah.mediawiki) if you also re-enable/extend certain opcodes like OP_AND and OP_LESSTHAN. See https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2016-September/013149.html and the ensuing thread.
Nathan Cook On Thu, 23 May 2019 at 21:33, Tamas Blummer via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > Difficulty change has profound impact on miner’s production thereby > introduce the biggest risk while considering an investment. > Commodity markets offer futures and options to hedge risks on traditional > trading venues. Some might soon list difficulty futures. > > I think we could do much better than them natively within Bitcoin. > > A better solution could be a transaction that uses nLocktime denominated > in block height, such that it is valid after the difficulty adjusted block > in the future. > A new OP_DIFFICULTY opcode would put onto stack the value of difficulty > for the block the transaction is included into. > The output script may then decide comparing that value with a strike which > key can spend it. > The input of the transaction would be a multi-sig escrow of those who > entered the bet. > The winner would broadcast. > > Once signed by both the transaction would not carry any counterparty risk > and would not need an oracle to settle according to the bet. > > I plan to draft a BIP for this as I think this opcode would serve > significant economic interest of Bitcoin economy, and is compatible with > Bitcoin’s aim not to introduce 3rd party to do so. > > Do you see a fault in this proposal or want to contribute? > > Tamas Blummer > > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev >
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