info on how Patchwork implemented the `reply` field in `post` messages: :information_source: - `%5mjm4vFWAV8wJm0BrxITtGvry28tC0L+Cz8K1grAvgM=.sha256` - `%4ADQhw8p5Ye+OZQSLxUyo7DBNUp8xWtSqtXF8RbkPjk=.sha256` in case this becomes a spec, here's a start.