Is it possible to use "Flash channels" to send non-transactional data, A.K.A 'zero-value' transaction type which simply broadcasts a message or data?
If so, is it free? And how to do it?
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Transactions made in flash channels are not written to the Tangle.
There are only two events that are stored:
When opening a flash channel, two (or more) entities, let's call them Alice and Bob, lock up Iotas.
This is why it wouldn't make sense to "broadcast a message or data" via Flash Channels. It would be just as good as broadcasting it without flash channels.