Derived Addresses - Show more rows starting from index - differ with Electrum wallet starting from index 20

[nullsavvy]

Mnemonic Code Converter; v0.5.4

Using default settings and the BIP39 Mnemonic; mystery sorry truck rural express wait method winner enforce logic gospel silent alone fantasy ride pilot price pool token chair dress mansion canvas current

Gives a list of 20 derived addresses ending with index 19

m/44'/0'/0'/0/19 | 1ExNZ3wknG2AvxmRwWVZ4KyFxFEaig1Mc2 | 031892f6aecf539e515098405a87cb0bcdbed4783b5921c074197430e9c8d93f78 | L4fRF35iJySPKzuMgNPTTk8mbWsLQBaxPL5xn5sztS7METCdSu7Q

Show more rows starting from index with a setting of 10 rows starting from (left blank) gives;

m/44'/0'/0'/0/20 | 1DCcxvVrj6tFrPfg4YZWYme4BYNS1d34D6 | 02e69c24dd22e7244ac88af356bb470145d4c807153623282aae79a42ee7ac951f | KxtdkL6mPZ3FTo4DDJuyLV9KrvQt2pD4gttZ5xLm9CNC89jtJjwB

m/44'/0'/0'/0/21 | 1NHueDEy5KtRjTtw6UviZee92MC81P8itw | 0314390dc92cdaa847804899662c0890647a3b2946919beeefd1342c3ecc197b98 | KwsqKsHvqPDh2YdTdcK9E1ACCwLLzTw2aKV4ifaZb2w2CN4A2uao

m/44'/0'/0'/0/22 | 18grScUvWQ1giG5fim2ZfcuLBkr17eqgyS | 034ad39f4dd5ee2be42965e6518fe448c2916e559e32b1dda1723e05cfb10ce189 | L2NRyk6z4jXgcL1EE9ZZ1HXoHCWPhLk9rhjonFPPxCh142TKhxX2

m/44'/0'/0'/0/23 . . . .

Electrum v4.4.5 From the menu select; Wallet -> Private keys -> Export to get a list of 30 keys which are equal to the Mnemonic converter up to index 19. Addresses and keys with index 20 to 29 are different.

19; 1ExNZ3wknG2AvxmRwWVZ4KyFxFEaig1Mc2 p2pkh:L4fRF35iJySPKzuMgNPTTk8mbWsLQBaxPL5xn5sztS7METCdSu7Q 20; 1Pf4nvfsT2CKwLQnYcgPxJwhPYYyNC9gCV p2pkh:L4rRmiSnsbcLSpkfXoHWacGMXET54C3BGFm6F6ZUcVoXWyDTBuCu 21; 1Kpxk91gKVd2NxV3rUrXZSh1qvSVmh1ANU p2pkh:L2BgzfZpynYpX4oSXETLi1UBQCsf7tcGsDXHipEzzmzomYSvzavw 22; 1EpuKpH4qK9eLocjK68tpJ3vdEW4swRidJ p2pkh:L3C5sDWh7gbHyeunLMMD1cGojXzsJbjyV3vb5L8Sc31zborfFC6j 23; . . . .

[iancoleman]

Thanks for this.

I reproduced the original discrepancy with electrum.

However bip32.org and rust crate bip32 both match this tool.

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Testing further, bip32.org derivation matches this tool. So maybe electrum is not generating correctly? To reproduce:

Load http://bip32.org/

Enter Root Bip32 extended key xprv9s21ZrQH143K2RNTXyvRSpYo18F2u9zxag3PwCqZgZbyEATwSERJQixPzL5cXHrV7EiVPTWp1u5UTZ1gdYqcRVqf2bf4iapyxsLDYM7Vd68

Set Derivation Path to custom

Set Custom Path to m/44'/0'/0'/0/20

See the address is 1DCcxvVrj6tFrPfg4YZWYme4BYNS1d34D6 which matches this tool but does not match electrum

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Testing further, rust crate bip32 also matches this tool. Minimal example:

use bip32::{Mnemonic, PublicKey, Prefix, XPrv};
fn main() {
    // Generate Mnemonic using the default language (English)
    let m = "mystery sorry truck rural express wait method winner enforce logic gospel silent alone fantasy ride pilot price pool token chair dress mansion canvas current";
    let mnemonic = Mnemonic::new(m, Default::default()).unwrap();
    // Derive a BIP39 seed value using the given password
    let seed = mnemonic.to_seed("");
    // Derive the root `XPrv` from the `seed` value
    let root_xprv = XPrv::new(&seed).unwrap();
    println!("Root xprv {:?}", root_xprv.to_string(Prefix::XPRV));
    // Derive a child `XPrv` using the provided BIP32 derivation path
    let child_path = "m/44'/0'/0'/0/20";
    let child_xprv = XPrv::derive_from_path(&seed, &child_path.parse().unwrap()).unwrap();
    // Get the `XPub` associated with `child_xprv`.
    let child_xpub = child_xprv.public_key();
    // Get the ECDSA/secp256k1 signing and verification keys for the xprv and xpub
    let verification_key = child_xpub.public_key();
    println!("Public Key Hex: {:x?}", verification_key.to_bytes());
}

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Open to ideas about why this difference exists. I can't work out how to generate the electrum key at index 20.

[nullsavvy]

Sorry I'm not familiar enough with the matter to give any idea about why this difference exist. But thank you very much for the detailed problem analysis, which I can use to drop an issue at electrum. Maybe they can explain us what is happening at index 20.