Bitcoin improvement proposals (BIPs)
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Trezor Wiki/Glossary/Development/Cryptography standards and elements/ Bitcoin improvement proposals (BIPs)
Bitcoin Improvement Proposals (BIPs) are open-design documents for introducing new standards and features to Bitcoin, such as new transaction types like SegWit or their properties like Replace-by-fee (RBF).
Trezor device and Trezor Wallet implement many of these public standards as described in the article about supported cryptocurrency standards.
See also: BIP repository, SatoshiLabs improvement proposals (SLIPs)