The Special Last Word of a Seed Phrase

• bips

  1,281 8,905 6.8 Wikitext

  Bitcoin Improvement Proposals

  

Try it for yourself. Type any 12-24 words (obviously not your own seed) from the BIP39 wordlist in https://iancoleman.io/bip39/, it will most likely give you an error stating it is invalid.

• bip39

  768 3,296 3.2 JavaScript

  A web tool for converting BIP39 mnemonic codes

Try it for yourself. Type any 12-24 words (obviously not your own seed) from the BIP39 wordlist in https://iancoleman.io/bip39/, it will most likely give you an error stating it is invalid.

• SurveyJS

  surveyjs.io sponsored

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• python-mnemonic

  70 802 6.8 Python

  :snake: Mnemonic code for generating deterministic keys, BIP39

  

In the case of a seed phrase, the purpose of the last word is ensuring your seed phrase is following the  structure described in the BIP39 standard. It is calculated from the initial data used to generate your seed phrase.

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