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Privacy

Privacy enhancements. 4 proposals.

• BIP 47: Reusable Payment Codes for Hierarchical Deterministic Wallets: Deployed. Introduces reusable payment codes that someone can publish once, for example on a website, without the privacy loss of reusing an address. Senders use the code to derive fresh addresses for each…
• BIP 69: Lexicographical Indexing of Transaction Inputs and Outputs: Complete. Proposes sorting transaction inputs and outputs in a standard, alphabetical-style order. Because wallets ordered them differently, observers could tell which wallet created a transaction; a shared…
• BIP 151: Peer-to-Peer Communication Encryption: Closed. Proposed encrypting the traffic between Bitcoin nodes so that internet providers and eavesdroppers could not easily read or tamper with it. This early design was later superseded by the version 2…
• BIP 340: Schnorr Signatures for secp256k1: Deployed. Defines a standard for Schnorr signatures, a simpler and more flexible signing method than the ECDSA scheme Bitcoin originally used, on the same elliptic curve. Schnorr signatures are compact (64…