Does someone know about graph databases like neo4j?

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1

It seems to be a great tool to model a Web of Trust.
Check http://neo4j.com/

Or here, the visualization tools : http://neo4j.com/developer/guide-data-visualization/

Does someone have skills ?

2

Not me.

What type of database is used currently then?
And how is it better than let’s say… OrientDB?

3

Currently, members (nodes) and certifications (edges) are stored in the blockchain.

My question is : Is it interesting to dump the data from the blockchain in a graph oriented DB ?
(in order to do graph analysis, visualization or else).

It’s an open question, as I have no skills about non conventionnal DB (NoSQL).