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Electrum v1 Seed

Recover every receive and change private key of a legacy Electrum v1 wallet from its 128-bit seed or 12 old-style words — entirely in your browser.

Old Electrum wallets stretch a 128-bit seed with 100,000 rounds of SHA-256, then derive every address from one master key. Enter the hex seed or its 12-word old-style mnemonic to recover all keys.

Instructions:
1. Enter a legacy Electrum v1 seed (32 hex characters) or its 12-word old-style mnemonic.
2. Choose how many receive and change addresses to derive.
3. The master secret is stretched with 100,000 SHA-256 rounds, then every private key is derived.
4. Everything runs locally in your browser — no seed ever leaves this page.

Educational tool — runs 100% in your browser. Electrum v1 (pre-2.0 "old") wallets derive every address from a single 128-bit seed via master = SHA256¹⁰⁰⁰⁰⁰(seed) plus a public master key, so anyone holding the seed or its 12-word mnemonic can recompute all receive & change private keys. Only use seeds you own and no longer fund.