Typo 2021-08-22-split-postmortem.md

"datcopy" — there's a missing "a" here; it should be "datacopy", matching the function name used elsewhere.
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@ -56,7 +56,7 @@ On the evening of 17th, we discussed options on how to handle it. We made a stat
It was decided that in this specific instance, it would be possible to make a public announcement and a patch release: It was decided that in this specific instance, it would be possible to make a public announcement and a patch release:
- The fix can be made pretty 'generically', e.g. always copying data on input to precompiles. - The fix can be made pretty 'generically', e.g. always copying data on input to precompiles.
- The flaw is pretty difficult to find, given a generic fix in the call. The attacker needs to figure out that it concerns the precompiles, specifically the datcopy, and that it concerns the `RETURNDATA` buffer rather than the regular memory, and lastly the special circumstances to trigger it (overlapping but shifted input/output). - The flaw is pretty difficult to find, given a generic fix in the call. The attacker needs to figure out that it concerns the precompiles, specifically the datacopy, and that it concerns the `RETURNDATA` buffer rather than the regular memory, and lastly the special circumstances to trigger it (overlapping but shifted input/output).
Since we had merged the removal of `ETH65`, if the entire network were to upgrade, then nodes which have not yet implemented `ETH66` would be cut off from the network. After further discussions, we decided to: Since we had merged the removal of `ETH65`, if the entire network were to upgrade, then nodes which have not yet implemented `ETH66` would be cut off from the network. After further discussions, we decided to: