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Advanced info
Entropy
Entropy values should not include the BIP39 checksum. This is automatically added by the tool.
Entropy values must be sourced from a
strong source of randomness.
This can be coin flipping, dice rolling, random noise data etc.Never use your own words, sentences from books, keyword smashing or anything random at a first glance. It will be not random enough for this application.
Do not store entropy.
Storing entropy (i.e. keeping a deck of cards in a specific shuffled order) is unreliable compared to storing a seed phrase (mnemonic).Instead of storing entropy, store the mnemonic generated from the entropy. Preferably on some solid medium.
This random seed phrase generator uses a
random number generator that is cryptographically secure.
If random cryptographic module is not available in your browser, the tool will show you a warning and the tool will not work. If that happens you may want to changea browser or use your own source of entropy.
Card entropy has been implemented assuming cards are replaced, not drawn one after another.
PBKDF2
What is PBKDF2 (Password Based Key Derivation Function 2) ?
Default number of iterations used in wallets is 2048. Increasing this number should make it more secure against brute force attacks, however you will have to store this value. To access your wallet with custom PBKDF2 you should use this script (or similar) to calculate your BIP39 seed phrase.
PBKDF2 iterations less than 2048 might be insecure without extra passphrase.
Learn how to protect your seed phrase with our guide
Possible use cases
Randomly compute a seed phrase safely if you need to. Generate 12 or 24 words seed phrase, and other lengths.
Check if your seed phrase is correct (you will receive a notification if a given word is not from the list.
You can check all your individual addresses without a wallet, if you would need that.
Compute your coins addresses plus private keys so you could retrieve funds manually by using Bip44 standard or other. Could be useful if you lose your wallet and are unable to get one.
Create a new bip39/44 wallet to create a coin address and transfer your coins ASAP, then later input the seed in a wallet and restore. Could be useful in a bad case of a compromised wallet.
Generate some truly random seed phrase with your own entropy source if you would like, for example, you can roll your own dice yourself.
See how things work inside your hardware or software wallet. It is easy to see here that your seed phrase is also an instruction set for setting up addresses and private keys (i.e. Bip44). You can see how keys and addresses are computed from the seed.
Advanced mode features
convert mnemonic code to seed (mnemonic code converter),
calculate derivation paths/addresses from mnemonics,
use your own entropy to create seed phrase.
Check out BIP39 Recoverer - our new seed phrase recovery tool!
Security notes & offline use:
You can use this tool 100% offline. For security it is preferable to use offline fresh system install or system on live usb. Download standalone offline file below and open it in a browser.
Remember to have a proper backup of your seed phrase. You can secure your seed phrase on solid seed phrase storage tool like Coinplate.
Read more
With BIP39 recovery phrase (also called mnemonic phrase), user can backup and recover Bitcoin and other cryptocurrency wallets without the need to use complicated private keys.
The BIP39 protocol uses a list of 2048 carefully chosen english words. Although the lists in different languages exists, it is usually not recommended to use them because most wallets do support only english words. Read more about BIP39 standard.
The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
License details
The MIT License (MIT)
Copyright (c) 2022 Coinplate
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Source code
You can check the full source code by downloading the offline version file above or visit our github and download from there.
Credits
This tool is based on Ian Coleman's mnemonics code converter.
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