I am currently aware of two privacy threats that are inherent to blockchain:
- Transactions can be linked through the grouping of addresses (Fergal Reid, Martin Harrigan. An analysis of the anonymity in the Bitcoin system. CDR, 2011).
- The blockchain addresses (and their corresponding transactions) can be linked to IP addresses (Alex Biryukov, Dmitry Khovratovich, Ivan Pustogarov. Deactivation of clients in the Bitcoin P2P network. CCS, 2014).
The threats in the articles are made for Bitcoin, but, as I have described, they can easily be generalized to generic blockchain threats.
Are there other privacy threats that can be considered inherent to a blockchain architecture, for example, based on its replication, radical transparency, …?
Thanks in advance.