BatchPin is the set of data pinned to the blockchain for a batch - whether it's private or broadcast.

Capabilities the supported featureset of the blockchain interface implemented by the plugin, with the specified config.

Callbacks is the interface provided to the blockchain plugin, to allow it to pass events back to firefly.

Plugin is the interface implemented by each blockchain plugin.

TransactionStatus is the only architecturally significant thing that Firefly tracks on blockchain transactions.