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Bitcoin
2026-09-28 09:09:19

Shielded Bitcoin paper proposes Zcash-style privacy on Bitcoin L1, but leaves peg mechanisms unresolved

A new paper from cryptography research group [[alloc] init] lays out "Shielded Bitcoin," a protocol that aims to enable private BTC transfers directly on Bitcoin’s base layer without a soft fork or a sidechain. Written by Clara Shikhelman, Mikhail Komarov, and Aleksei Moskvin, the design borrows from Zcash’s shielded pool model, using encrypted notes, public nullifiers, and zero-knowledge proofs while treating Bitcoin as a data-availability layer through OP_RETURN-based envelopes. Indexers would watch the chain, replay transactions in block order, and discard invalid ones. The paper also highlights a key limitation: peg-in and peg-out, the mechanism for moving BTC into and out of the system, are explicitly left for future work. The proposal arrives as privacy assets and narratives are gaining traction. ZEC reached about $1,600 this week, with a roughly $26 billion market cap and ranking ninth among cryptocurrencies, while Grayscale’s Zcash ETF ZCSH has drawn more than $250 million in net inflows since its August 25 launch. The article also points to Citrea’s acquisition of privacy-focused Bitcoin wallet Crest, NEAR’s rollout of default confidential perpetuals and confidential limit orders, and broader concerns that AI-driven surveillance could make transparent blockchains more exposing over time. In that context, Shielded Bitcoin is being framed as an attempt to bring privacy demand back onto Bitcoin itself rather than leaving it to Ethereum, Monero, Solana, or Zcash.

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Shielded Bitcoin paper proposes Zcash-style privacy on Bitcoin L1, but leaves peg mechanisms unresolved
Citrea
2026-09-10 04:30:00

Citrea restores cross-chain services for ctUSD, USDC, USDT, WBTC and CTR after review

Bitcoin ZK Rollup project Citrea said it has restored cross-chain services for ctUSD, USDC, USDT, WBTC and CTR after completing a full review. The team added that some Solver-based routing remains in the process of coming back online. The update follows a security incident involving third-party application Zentra Finance, where the team said it had identified the root cause and paused the related contracts. Citrea said its own protocol and cross-chain bridge contracts were not affected. The project also said it will separately disclose the impact of the incident on ecosystem products including the ctUSD Earn Vault, as well as on depositors. The statement was reported by ChainCatcher.

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Citrea restores cross-chain services for ctUSD, USDC, USDT, WBTC and CTR after review
Citrea
2026-09-09 15:00:52

Citrea suspends bridging for select assets after Zentra Finance security incident

Bitcoin ZK-rollup project Citrea said it has temporarily suspended bridge transfers for ctUSD, USDC, USDT, WBTC and CTR after a security incident involving third-party application Zentra Finance. The move was described as precautionary. Citrea said its core protocol and bridge contracts were not affected by the incident, and funds held outside Zentra Finance were not impacted. It also said the rest of the network remains operational. The team is now investigating the incident together with the Zentra team and said bridging services for the affected assets will resume once safety is confirmed. Citrea added that it will continue to share updates as the investigation progresses.

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Citrea suspends bridging for select assets after Zentra Finance security incident
Citrea
2026-08-19 20:46:55

Citrea adds MoonPay on-ramp and off-ramp support for ctUSD

Citrea has launched a fiat on-ramp and off-ramp for its ctUSD stablecoin through a partnership with MoonPay, opening direct fiat-to-ctUSD access for users in more than 120 countries and regions. The integration is designed to connect the Bitcoin ecosystem with the fiat system through a simpler entry route. According to the announcement cited by Techub, ctUSD is supported by M0 infrastructure and is fully backed by U.S. dollars and short-term U.S. Treasury bills. Citrea said the stablecoin is intended to provide base liquidity for Bitcoin applications. The report also noted that ctUSD’s peak supply has exceeded 24 million tokens. Citrea said the MoonPay integration is expected to lower the barrier for users entering Bitcoin capital markets.

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Citrea adds MoonPay on-ramp and off-ramp support for ctUSD