Can a composer fabric business network, .bna file, be deployed to the bluemix blockchain service today?
You can use Composer with the Bluemix Blockchain service today.
However, you must be running a local copy of the Composer Playground as the version of Composer running on Bluemix (fabric-composer.mybluemix.net) only supports the web connection profile at the moment.
You can set up a local copy of the Composer Playground by following the instructions here: https://fabric-composer.github.io/start/getting-started-playground.html
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