You can make the range more smaller in some way, scaning all the range or going random is not the best solution here. This is just my opinion, when I will find it I will let you know ahahaha

How to safely withdraw BTC from puzzle wallets (71 included)

Hey everyone, since I’ve seen more interest lately around the puzzles and some people getting sniped, I thought I’d post a quick guide on how to do it right. Especially since puzzle 71 is very close to being found and it has over 7 BTC in it.

This method works for any puzzle where the private key is in a low range and you're able to recover it. If you just found the key and you're planning to import it in Electrum and click send... stop right now and read.

Why you shouldn't use the mempool

Once you broadcast a transaction to the public mempool (even with a high fee), the pubKey becomes visible. That means anyone monitoring the network can instantly start brute-forcing the private key and if the range is small (like puzzle 71), they'll find it in seconds. Even if you broadcast first, someone can RBF you with a higher fee and steal it.

It already happened with multiple puzzles. Some bots are running 24/7 and replacing transactions 50+ times until they win.

Correct way to withdraw

1. Generate a secure BTC address

Don’t send funds to an old or reused address. Use a new address from a wallet you control. Sparrow wallet is good, Electrum works too, or hardware wallet. Segwit is fine. Save the seed and verify it works.

2. Craft the transaction offline

Import the puzzle private key into an offline wallet or use command-line tools (bitcoin-tx or Sparrow in offline mode). Build a transaction that sends the funds to your new BTC address.

Set a high fee. I’d recommend something like 30k to 100k sats depending on size. If the TX is 300 vbytes, go with 300 sat/vB or more. Don’t cheap out on this, it’s less than $50 to secure over $700k worth of BTC.

Export the signed raw transaction as HEX. Do not broadcast it yet.

3. Use a miner relay (not public broadcast)

Now go to: https://slipstream.mara.com/

This is a private relay to the Marathon mining pool. Paste your signed TX hex and submit it. That way, your transaction goes directly to the miner and isn’t seen by the public mempool or sniping bots.

Once it’s mined, the BTC will be in your address. At that point, it’s too late for anyone to do anything the UTXO is already spent.

What if I don’t use slipstream?

Then your transaction will show up in the mempool, bots will see it, and if you’re not using RBF defense or an aggressive strategy, they can and will steal it. You’ll see your TX dropped and someone else’s version with a higher fee getting confirmed.

If you’re not 100% sure how to use slipstream or build a raw TX, ask before you risk it.

Puzzle 71 warning

We’re almost there. Someone will solve 71 soon, maybe already has. If you’re the one who gets the key, please don’t lose the funds by broadcasting it naively. Follow the steps above and you’ll be fine.

Happy hunting and stay safe.

[Puzzle?] 90.42691 BTC unspent UTXO at bc1qnfmreg… (Tx 308fd7…2103, 16-Apr-2023)

Hi everyone,

While reviewing the **16 April 2023 “×10 refresh” transaction** that boosted all *unsolved* Bitcoin-Puzzle rewards, I spotted one output nobody seems to have covered:


Why it caught my eye

Detail	Relevance
All other outputs (~872 BTC) from the same TX were fanned out to every known puzzle address (#66 → #160) at exactly 10 × their previous reward.	Classic “refresh” pattern.
This UTXO is the only leftover and was NOT part of the original puzzle list.	Looks intentionally isolated.
9 042 691 000 sats = 9 042 691 × 1000.  The core integer 9 042 691 is prime (the 605 088-th prime).	Prime indices are a hallmark of the puzzle creator.
Puzzle #90 is already solved (privkey = 868012190417726402719548863).	So this 90-BTC chunk cannot be the original #90 reward.
No OP_RETURN, no child tx, no dust “pings”.	Address looks like a deliberate parking spot.

Working theories so far

• Fee / staging buffer – The creator might hold a large reserve for future fan-outs; 90 BTC is more than strictly necessary.
• New puzzle seed (maybe #161?) – [icode]9042691[/icode] could serve as seed or checksum, e.g. 
  [icode]priv_161 = SHA256(priv_90 || 9042691) mod n[/icode]
• Timing beacon – Leaving a juicy UTXO idle helps measure how fast bots notice any movement.

What I’m hoping the community can clarify

• Has the puzzle author (“Midori”, “13E”, etc.) ever referenced 9042691 or this 90-BTC address on IRC / Telegram / Reddit / Bitcointalk?
• Any archived chats from April 2023 that mention a prime × 1000 marker?
• Do the TX values align with any known SHA256-chain or XOR-chain progression of the solved puzzle keys?

Explorer link: 
https://www.blockchain.com/explorer/addresses/BTC/bc1qnfmregvreguzxsvped4vxxvdrxcqfcuclzymax

Inputs that funded the refresh (for context – they are NOT puzzles)

Thanks in advance for any leads or theories — and happy hunting! 
— JeLACOSTE

Guys, have you ever thought that maybe it’s not a piece-by-piece puzzle at all, but simply a quiz?
I mean, maybe the creator hid a pattern that could lead us straight to the solution. Has this idea been discussed already?
Could you give us some hints, please @saatoshi_rising?
We would really appreciate it!