From Bitcoin Wiki
This page describes a BIP (Bitcoin Improvement Proposal).
- [16 Apr 2013] Added private derivation for i >= 0x80000000 (less risk of parent private key leakage)
- [30 Apr 2013] Switched from multiplication by IL to addition of IL (faster, easier implementation)
- [25 May 2013] Added test vectors
- [15 Jan 2014] Rename keys with index ≥ 0x8000000 to hardened keys, and add explicit conversion functions.
BIP: 32 Title: Hierarchical Deterministic Wallets Author: Pieter Wuille Status: Accepted Type: Informational Created: 11-02-2012
Please see BIP 0032 for the up-to-date text and status.