If you only have one Bitcoin and want to store it cold with the highest security standards, I will design a more streamlined but still extremely secure solution. 📌 target • Use Ledger to generate a new 24 word mnemonic cold wallet • Make metal steel plate backups to prevent fires, floods, and physical damage Adopting physical encryption and storage strategies to ensure that assets cannot be easily recovered even if steel plates are stolen Distributed storage to prevent single point of failure Establish a recovery mechanism to ensure that the individual or beneficiary can retrieve assets when necessary 🛠️ Overview of the Plan 1. Generate a cold wallet 1. Use a Ledger device to reset to a new wallet • Select 'Set as new device' → Generate 24 word mnemonic words Be sure to operate in an offline environment and avoid networking • No photos, no screenshots, no online presence, only copied onto paper or metal plates 2. Create a Bitcoin payment address Create a new Bitcoin account on Ledger Live Record the receiving address (public key) of the account 3. Transfer 1 BTC to a new address Send 1 BTC to a cold wallet address using an online wallet (such as Binance, Coinbase, other wallets) Use a blockchain browser to verify if the transaction was successful 4. Disconnect the Ledger Ensure that BTC has been credited, completely shut down the Ledger, and reset the device 2. Steel plate backup for mnemonic words Make 2 metal backups to prevent loss or damage. ✅ Backup 1 (complete mnemonic+physical encryption) • Use Cryptosteel, Billfodl, CryptoTag, or DIY stainless steel plates Burn a complete 24 word mnemonic phrase Add the "25th mnemonic phrase" (Passphrase) Ledger allows the setting of additional "mnemonic word passwords", namely BIP39 passphrases, to enhance security Even if the steel plate is stolen, attackers still cannot recover BTC You can set a secret phrase that is easy to remember but cannot be guessed by outsiders (such as your special date, abbreviation, etc.) ✅ Backup 2 (Split Storage) • Adopting Shamir's Secret Sharing (SLIP-39) Split the mnemonic into 3 parts, requiring 2 parts to restore (2-of-3) • Example: Backup A: Store 12 mnemonic words Backup B: Store 12 mnemonic words (but partially overlap with A) Backup C: Store 25% of complete mnemonic words (cannot be restored separately, but can be combined with A/B recovery) Even if the thief obtains one steel plate, they cannot recover the wallet 3. Physical storage solution Adopting a three location storage strategy to prevent single point loss. 1. First copy (complete mnemonic+Passphrase) • Stored in a bank safe or fire-resistant and waterproof safe • Set up two person access rules (requires your identity+trusted family member/lawyer authorization) 2. Second part (splitting mnemonic words, 2-of-3 Shamir scheme) • Stored in 3 different locations (hidden at home+family safe+remote secure storage) Each fragment is stored separately, incomplete mnemonic words require at least 2 copies to recover 3. Third copy (only storing BTC address to prevent forgetting) In a separate notebook or file, only record the Bitcoin address (without mnemonic words or private keys) This allows you to check your balance at any time, ensuring that BTC remains safe 4. Access and recovery mechanism 1. How to recover BTC • You can recover on your own: • Use your Ledger+Backup 1 (full mnemonic)+memorized Passphrase • Family/beneficiary recovery: • Use Backup 2 (Shamir shard), if you are unable to restore it on your own, you can have 2 trusted persons collaborate to restore it 2. How to prevent theft Even if the attacker obtains one steel plate, they still cannot recover it (because a Passphrase or Shamir combination is required) All backups do not mention any BTC information (even if the bank checks the storage content, it cannot determine if it is BTC related) Set access control for the safe to prevent unauthorized access 📌 conclusion Implementation method of security measures Prevent Ledger from losing and using mnemonic word backup, can restore wallet Prevent physical damage to stainless steel mnemonic backup, fire-resistant and waterproof Prevent theft Passphrase (25th word)+Shamir split storage Prevent forgetting to store BTC address and regularly check balance Prevent family members from being unable to restore beneficiary settings and access rules 🚀 Why is this solution safer than regular backup? ✅ Even if someone steals the steel plate, he still cannot recover BTC (due to Passphrase protection) ✅ Even if the bank seals your safe, your BTC is still safe (due to Shamir sharding+distributed storage) ✅ Even if you pass away, your family can still recover BTC (due to the pre-set beneficiary access mechanism) ✅ Even if you lose a mnemonic backup, you can still recover BTC (due to multi location storage) This solution balances security, recoverability, and theft prevention, and is suitable for long-term storage of 1 BTC while preventing any external attacks or accidental loss. 🚀 This method ensures the security of your BTC, so you can worry free in the future! 🚀