I'm happy to help with secure paper wallet support. Bitcoin core is already used offline by the Glacier Protocol, though there's no official offline support.
I extended the Glacier Protocol with an extra password derivation function. I used Scrypt with 2GB RAM requirement, though maybe using Argon2id V1.3 would be better. Also I'd prefer using BIP45 Multisig HD Wallets over a multisig address, as in the current Glacier Protocol implementation the redeem key is public because of the test withdrawal transaction. On Sat, Sep 30, 2017 at 6:49 AM, Jonas Schnelli via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > > > Hi, > > > > I'm writing to suggest and discuss the addition of paper wallet > > functionality in bitcoin-core software, starting with a single new RPC > > call: genExternalAddress [type]. > > > > AFAIK, client implementations such as your proposal are off-topic for this > ML. > Better use bitcoin-core-dev (ML or IRC) or Github (bitcoin/bitcoin) for > such proposals. > > > > On 09/29/2017 02:03 PM, Luke Dashjr wrote: > > Paper wallets are a safety hazard, insecure, and generally not advisable. > > > > I have to agree with Luke. > And I would also extend those concerns to BIP39 plaintext paper backups. > > IMO, private keys should be generated and used (signing) on a trusted, > minimal and offline hardware/os. They should never leave the device over > the channel used for the signing I/O. Users should have no way to view or > export the private keys (expect for the seed backup). Backups should be > encrypted (whoever finds the paper backup should need a second factor to > decrypt) and the restore process should be footgun-safe (especially the > lost-passphrase deadlock). > > > /jonas > > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev > >
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