Easier multi-participant synchronization in Daml Script

[cocreature]

Currently it’s non-trivial to synchronize between participants in a Daml Script, see https://discuss.daml.com/t/init-script-on-a-canton-setup/3009/6 for example. If you don’t create a contract or archive it (e.g. a nonconsuming choice) it becomes close to impossible to synchronize (you can’t poll for the change).

We should try to make that a bit easier. I think to make this work somewhat reliably we need to provide transaction ids and allow polling for those.

[wallacekelly-da]

I also just ran up against this, as described here.