$BTC - A new spec proposes shielded transfers that obscure senders, receivers, and amounts.

The Shielded Bitcoin design borrows zero-knowledge proofs from Zcash to hide transaction details on-chain.
Entry and exit mechanisms for moving BTC in and out of the shielded pool remain unspecified for now.
Decrypt reports the research team plans a follow-up paper to address the on-ramp and off-ramp gaps.

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