Researchers propose write-public ORAM to enable private blockchain RPC queries without revealing accessed state

The authors—research interns Ananya Appan and James Austgen with Kushal Babel and sourav1547—propose write-public ORAM, a new primitive letting RPC nodes serve blockchain queries without revealing what is read. Since blockchain writes are public, only reads need hiding, making the scheme cheaper than full ORAM: writes cost 3–4 times less than Path ORAM, while reads are about 1.3 times worse. It builds on Path ORAM, using a non-recursive map for public writes to avoid O(log N) overhead, with coherence maintained between the two maps. The work targets TEE-based private RPC nodes.

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