Moving a sofa is an archaeological event. Three bottle caps, a hair tie, something that was once a treat, a toy mouse presumed lost in 2021, and a quantity of fur that suggests a fourth cat nobody has met.

Most of it goes in the bin. One or two items turn out to still matter.

People find old bitcoin the same way — a paper wallet in a drawer, a scrap with a long string on it, an exchange account from eight years ago, a USB stick labelled with a year. This is what to do about it, and the order matters a great deal.

1. Before You Touch Anything: Assume It's Compromised

Start here, because it changes every subsequent step.

If that key has ever existed in digital form — typed into a computer, generated by a website, photographed, emailed, stored in a cloud drive, printed from a machine with a network connection — treat it as though somebody else may already have it.

That isn't paranoia. Paper wallet generators from the early years were frequently compromised, some deliberately. Printers cache documents. Old laptops got sold. The fact that a balance is still there today tells you nothing except that nobody has bothered yet.

The practical consequence: once you move those coins, move all of them, in one transaction, immediately, to a wallet whose keys you generated yourself on a device you trust. Do not move half. Do not leave the rest for later.

2. Sweep, Don't Import

A distinction that trips people up and genuinely matters:

• Importing adds the old private key to your wallet. The coins are now spendable by you — and by anyone else who has that key. You've adopted a secret you don't control.
• Sweeping creates a transaction that sends everything from the old key to a brand-new address of yours, and then the old key is irrelevant forever.

Always sweep. Any decent wallet offers it explicitly. If a tool only offers "import", find another tool.

3. The Actual Procedure

• Check the balance first, without exposing the key. You can look up the address on a block explorer. Never enter a private key anywhere to "check" it — that request is the single most common way these finds get stolen.
• Set up the destination wallet first, before touching the old key. Fresh seed, generated by your own device, backed up and tested.
• Do it on a clean machine, with the old key entered as late as possible and nowhere else.
• Mind the fees. If the find is small, the sweep may cost more than it's worth, especially if the coins sit in many tiny outputs. Check current fee rates and consider waiting for a quiet period.
• One transaction, everything, done. Then verify it arrived in your new wallet.
• Destroy the old material — or keep it somewhere secure if you want it as a memento, understanding that it's now an empty, worthless, and permanently public key.

4. The Variants You Might Find

• A paper wallet with two QR codes. One is the address (safe to scan and look up), one is the private key (the thing to protect). Sweep it.
• A bare private key or WIF string. Same procedure. Note that a key produced before 2013-ish may be in an older format; modern wallets generally handle it, but check rather than assume.
• An old exchange account. Not a key at all — it's a claim. Try the recovery process. If the exchange no longer exists, there may be a bankruptcy claims process, or there may be nothing; both happen.
• A seed phrase from a defunct wallet app. The words are standard. Restore them in a modern wallet — and if the balance doesn't appear, the derivation path or address type is the usual culprit, not a loss.
• Forked coins. If the find predates certain forks, there may be balances on other chains too. Be extremely careful here: the "claim your forked coins" tooling has historically been a dense cluster of scams. Sweep the bitcoin first, with that key retired, before going anywhere near the rest.

5. Keep Your Expectations Honest

Most finds are small. The dramatic stories you've read are selected precisely because they're dramatic, and the far more common outcome is a few thousand sats, a fee that eats a chunk of it, and an afternoon spent on a result that buys lunch.

That's still worth doing — it's free money and a genuinely good practice run. Just don't spend a week on it with your expectations somewhere else.

And if it is large: slow down. Set the destination up properly, do the restore drill on the new wallet before sweeping, and tell nobody. A sudden large balance in a wallet you built in a hurry, celebrated publicly, is a story with a bad ending attached.

The Point

Most of what's under the sofa is bottle caps. One item in twenty is the toy mouse somebody has been mourning for years, and the way you find out is by moving the furniture rather than by speculating about it.

Go and look. Just assume anyone else could have looked too — and when you find something, move it all, once, to somewhere only you have ever seen the key to.

Sweep, don't import. All of it, immediately, to a key you made yourself. 🐾⚡