polling/updating

[jellegerbrandy]

This issue just to mark the fact that we need some kind of way of updating hte UI if content on the blockchain changes.

There are two options:

• polling
• websockets

And we have two possible data sources to read the info form:

• ethereum node. I.e. we can subscribe to event logs on the node, and update our data according to those events.
• paratii-db: We can poll the database for changes, and update our data accordingly

We can even mix that: poll the db for changes, and then read (with the help of paratii-lib) the latest state fromthe blockchain.

There are pro's and con's to both.

[jellegerbrandy]

@ya7ya , @bent0b0x