# SLIP-39 / BIP-39 / Electrum Seed Bridge

Detects, validates and bridges crypto wallet seeds offline: BIP-39 checksum and entropy recovery, SLIP-39 Shamir share parsing with RS1024 checksum and single-group recombination, Electrum v2 version-tag validation and legacy v1 detection — then derives the BIP-32 master xprv/xpub and the first five m/44′/0′/0′/0 addresses, and converts entropy both ways between BIP-39 mnemonics and single-group SLIP-39 share sets.

> Canonical page: https://elysiatools.com/en/tools/slip39-bip39-electrum-seed-bridge

- **Category:** Converter

- **Keywords:** slip39, bip39, electrum seed, seed converter, mnemonic converter, shamir backup, shamir secret sharing, wallet recovery, trezor migration, seed bridge, entropy, xprv, bip32, derivation path, rs1024, checksum, master seed, crypto mnemonic, wallet backup, share threshold

## Overview

Paste one seed: a BIP-39 mnemonic (12/15/18/21/24 words), SLIP-39 shares (one per line; 20 or 33 words each), an Electrum v2 seed, or a legacy Electrum v1 seed from the old 1626-word list — or hex entropy in entropy mode. The engine validates the checksum (BIP-39 SHA-256, SLIP-39 RS1024 Reed-Solomon, Electrum HMAC-SHA512 version tag), recovers the entropy (128/160/192/224/256 bits), derives the BIP-32 master key and 5 receiving addresses (m/44′/0′/0′/0/0..4, P2PKH), and bridges: BIP-39 entropy → a fresh single-group T-of-N SLIP-39 share set, SLIP-39 master secret → equivalent BIP-39 mnemonic. Electrum v1 seeds derive their SHA-256 WIF directly. Everything is computed in-process with no network, disk or logging — but never paste a funded seed into any web tool; use offline copies for real migrations.

## Inputs

- **Seed input (mnemonic / shares / entropy hex)** (textarea): BIP-39: abandon abandon ... about SLIP-39: one share per line (20 or 33 words each) Entropy mode: 32-64 hex chars
- **Passphrase / 25th word (optional)** (text): empty by default; SLIP-39 and Electrum also use it
- **Input mode** (select)
- **SLIP-39 threshold T (shares needed)** (number): e.g. 2
- **SLIP-39 share count N (when splitting)** (number): e.g. 3
- **SLIP-39 iteration exponent** (select)

## When to use

- Converting a standard BIP-39 mnemonic into a distributed T-of-N SLIP-39 Shamir backup for multi-location storage.
- Recombining SLIP-39 threshold shares into a master secret to recover an equivalent standard BIP-39 seed phrase.
- Verifying seed checksum validity, derivation paths, and first-five receiving addresses across BIP-39, SLIP-39, or Electrum formats.

## How it works

- Paste a BIP-39 mnemonic, newline-delimited SLIP-39 share phrases, an Electrum seed, or raw hexadecimal entropy into the input field.
- Specify an optional passphrase, select your parsing mode or keep auto-detection enabled, and configure the target SLIP-39 threshold (T), share count (N), and iteration exponent.
- The client-side engine validates the format checksum (SHA-256, RS1024 Reed-Solomon, or HMAC-SHA512) and reconstructs the underlying entropy or master secret.
- Inspect the generated BIP-32 master keys (xprv/xpub), the first five derived m/44'/0'/0'/0 receiving addresses, and the bridged backup phrases.

## Use cases

- Migrating wallet backups from hardware wallets using Trezor SLIP-39 Shamir backup to wallets that only accept standard BIP-39 mnemonics.
- Splitting an existing 12-word or 24-word BIP-39 recovery phrase into a 2-of-3 or 3-of-5 Shamir share set without changing the underlying master private key.
- Auditing legacy Electrum seeds to inspect derived public addresses and verify backup integrity against standard BIP-32 derivations.

## Frequently asked questions

### Does this tool send my seed phrase or shares over the internet?

No. All checksum calculations, Shamir secret sharing recombinations, and key derivations execute entirely in-process within your local browser runtime.

### What is the difference between BIP-39 and SLIP-39?

BIP-39 encodes entropy into a single sequence of 12 to 24 words, while SLIP-39 splits master entropy into a threshold set of shares (e.g., 2-of-3) using Shamir's Secret Sharing and RS1024 checksums.

### Can I convert between 20-word and 33-word SLIP-39 shares and BIP-39?

Yes. 20-word SLIP-39 shares encode 128 bits of entropy (equivalent to 12-word BIP-39 phrases), while 33-word shares encode 256 bits of entropy (equivalent to 24-word BIP-39 phrases).

### How are Electrum v1 and v2 seeds handled?

Electrum v2 seeds are validated using HMAC-SHA512 version prefixes, while legacy Electrum v1 seeds are detected against the historical 1626-word dictionary to derive direct SHA-256 private keys.

### Which derivation path is used for the generated addresses?

The bridge derives the master BIP-32 extended key (xprv/xpub) and calculates the first five legacy Bitcoin P2PKH receiving addresses using the standard m/44'/0'/0'/0/0 through m/44'/0'/0'/0/4 path.

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