The New Security Bar for Onchain Finance
Private Today, Durable Tomorrow
Privacy, Identity & Compliance Infrastructure
Privacy is not a side quest for digital assets; it is a prerequisite for institutional, consumer, and enterprise adoption. Castle Labs maps the full stack: privacy chains, Ethereum privacy systems, privacy-first L2s, FHE, MPC, TEEs, private compute, identity, and selective-disclosure systems. The core reader problem is clear: how can users and institutions keep sensitive information private while still proving what regulators, counterparties, and applications need to know?
$29.4B
privacy asset market cap
$897.9M
privacy protocol TVL
Sources: DeFiLlama privacy protocols (2026-09-15), CoinGecko privacy assets (2026-09-15).
Questions Covered
Which privacy technologies are being used onchain?
Castle maps zero-knowledge proofs, fully homomorphic encryption, multiparty computation, trusted execution environments, private chains, and application-level privacy systems.
Can privacy and compliance coexist?
Selective disclosure lets a user prove a required fact without exposing every balance, transaction, counterparty, or piece of identity data to the public.
Where does privacy sit in the stack?
Privacy can be built into a base layer, rollup, smart contract, wallet, identity system, or application. Each placement changes the trust assumptions, composability, performance, and information exposed.
Latest Privacy Research
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Research for your market
Castle works with protocols, investors, and market teams on category research, competitive analysis, and distribution.