Good morning Mike, The issue with SCRIPT re-evaluation is that reorgs cause more processing to be done by nodes.
Floating-point Nakamoto Consensus does not help here, since a node can receive the lower-scored block first, and *then* a higher-scored block, and thus will ***still*** observe a reorg since the chain tip is replaced with a higher-scored block later. This still increases the processing load on validating fullnodes, and prevents any kind of pruning from working for validating fullnodes. A miner can also still mount a DoS on validating fullnodes, with `OP_PUBREF` and Floating-Point Nakamoto Consensus by re-mining the same block, and broadcasting a block if it has higher score than the previous chain tip. This locks the blockchain ***and*** increases the load on fullnodes, which have to re-validate uses of `OP_PUBREF` that might refer to the chain tip. Regards, ZmnSCPxj > Hey ZmnSCPxj, > > Re-orgs should be solved in a different way. > > Best Regards, > Micahel > > On Sat, Aug 1, 2020 at 5:36 PM ZmnSCPxj <zmnsc...@protonmail.com> wrote: > > > Good morning Mike, > > > > Hard NAK. > > > > The responses to the original posting already pointed out important > > problems with this: > > > > * Encourages address reuse, hurting fungibility and privacy. > > * Prevents pruning, since access to previous blocks must always be > > available in order to validate. > > * Optimized implementation requires creating yet another index to previous > > block data, increasing requirements on fullnodes. > > * Requires SCRIPT to be re-evaluated on transactions arriving in > > newblocks, to protect against reorgs of the chaintip, and in particular > > `OP_PUBREF` references to near the chaintip. > > > > None of these issues have been addressed in your current proposal. > > The proposal looks at clients only, without considering what validators > > have to implement in order to validate new blocks with this opcode. > > > > Regards, > > ZmnSCPxj _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev