The New Security Bar for Onchain Finance
Public balances and quantum-vulnerable signatures are the two security gaps in onchain finance. How Starknet's strkBTC handles privacy, compliance and post-quantum risk.
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?
$33.0B
privacy asset market cap
$1.0B
privacy protocol TVL
Sources: DeFiLlama privacy protocols (2026-11-01), CoinGecko privacy assets (2026-11-01).
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Privacy Ecosystem on Solana
How Solana privacy works across Arcium, MagicBlock, Umbra, Privacy Cash and Hush, with Arcium past 900k computations since February 2026.
ZK Proofs: Is Privacy Cheap Enough to Be Mainstream?
What ZK proofs cost across verification, proving and publishing, and how Ethereum zkVM proving fell from 16 minutes to 16 seconds with costs down 45x in 2025.
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
Showing 1-2 of 2 articles
·PrivacyMarkets
A New Standard for Privacy
How StarkWare's STRK20 and strkBTC bring compliant privacy to ERC20 tokens on Starknet, vs Zcash, Railgun and Tornado Cash. Privacy coins rose 288% in 2025.
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·PrivacyMarkets
Proving YourSELF: Privacy and Identity Verification in the Age of AI
How Self Protocol uses ZK proofs of passport data for private proof of humanity on Celo, as AI deepfakes fuel fraud and Aave pays verified users double yield.
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Research for your market
Castle works with protocols, investors, and market teams on category research, competitive analysis, and distribution.