BIPs bitcoin improvement proposals

199 - Hashed Time-Locked Contract transactions

<pre> BIP: 199 Layer: Applications Title: Hashed Time-Locked Contract transactions Author: Sean Bowe <sean@z.cash> Daira Hopwood <daira@z.cash> Comments-Summary: No comments yet. Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0199 Status: Draft Type: Standards Track Created: 2017-03-27 License: BSD-3-Clause CC0-1.0 </pre> ==Abstract== This BIP describes a script for generalized off-chain contract negotiation. ==Summary== A Hashed Time-Locked Contract (HTLC) is a script that permits a designated party (the "seller") to spend funds by disclosing the preimage of a hash. It also permits a second party (the "buyer") to spend the funds after a timeout is reached, in a refund situation. The script takes the following form: OP_IF [HASHOP] <digest> OP_EQUALVERIFY OP_DUP OP_HASH160 <seller pubkey hash> OP_ELSE <num> [TIMEOUTOP] OP_DROP OP_DUP OP_HASH160 <buyer pubkey hash> OP_ENDIF OP_EQ...

39 - Mnemonic code for generating deterministic keys

<pre> BIP: 39 Layer: Applications Title: Mnemonic code for generating deterministic keys Author: Marek Palatinus <slush@satoshilabs.com> Pavol Rusnak <stick@satoshilabs.com> Aaron Voisine <voisine@gmail.com> Sean Bowe <ewillbefull@gmail.com> Comments-Summary: Unanimously Discourage for implementation Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0039 Status: Proposed Type: Standards Track Created: 2013-09-10 </pre> ==Abstract== This BIP describes the implementation of a mnemonic code or mnemonic sentence -- a group of easy to remember words -- for the generation of deterministic wallets. It consists of two parts: generating the mnemonic and converting it into a binary seed. This seed can be later used to generate deterministic wallets using BIP-0032 or similar methods. ==Motivation== A mnemonic code or sentence is superior for human interaction compared to the handling of raw binary or hexadecimal representations of...

123 - BIP Classification

<pre> BIP: 123 Title: BIP Classification Author: Eric Lombrozo <elombrozo@gmail.com> Comments-Summary: No comments yet. Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0123 Status: Active Type: Process Created: 2015-08-26 License: CC0-1.0 GNU-All-Permissive </pre> ==Abstract== This document describes a classification scheme for BIPs. BIPs are classified by system layers with lower numbered layers involving more intricate interoperability requirements. The specification defines the layers and sets forth specific criteria for deciding to which layer a particular standards BIP belongs. ==Copyright== This BIP is dual-licensed under the Creative Commons CC0 1.0 Universal and GNU All-Permissive licenses. ==Motivation== Bitcoin is a system involving a number of different standards. Some standards are absolute requirements for interoperability while others can be considered optional, giving implementors a choice of whether to support them. ...