rich1.0npub1j8mfekhmgtne6ptzxptudrcpwd6wtyxk64qdn3swy2nv46zuledskwpachhttps://nostr.ae/npub1j8mfekhmgtne6ptzxptudrcpwd6wtyxk64qdn3swy2nv46zuledskwpachnjumphttps://nostr.ae📅 Original date posted:2015-03-12 📝 Original message:When Jim and I were selecting which combination of HD wallet structures to support we noted the following: * BIP39 is a good standard list to select from that mandates words that do not look similar to each other, a certain spelling (no English US/UK confusion) and possible foreign language variants provided by experts later * BIP32 (m/0h/0/0) and BIP44 (m/44h/0h/0h/0/0) allow for maximum compatibility with other wallets * including a date in the "wallet words" themselves is open to spoofing since the generator cannot be sure the date is correct (local time drift, provided externally by untrusted third party etc) * a timestamp as optional external metadata is useful to reduce sync times in SPV * our experience verified that users will very often enter a timestamp incorrectly (locale, fat fingers, bad memory etc) so we opted for "number of days elapsed since Bitcoin genesis block with a modulo 97 checksum appended" (e.g. 1850/07) to mitigate this * if a user has no timestamp then blank is the only alternative (no guessing) which is interpreted as "earliest possible BIP32 date" * if restoring the user has to select where the "wallet words" came from (e.g. MultiBit HD, Trezor, Mycelium etc) Users will naturally assume that they can type their "wallet words" (a more mainstream-friendly term than "seed phrase") into any wallet and with a bit of fiddling about get their bitcoins back. As wallet developers it is within our capability to make that happen and I think we're quite close already. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20150312/4e18a33f/attachment.html>