The Most Durable Bitcoin Cold Wallet
Everything you need to store your Bitcoin seed securely stamped on thick metal plates and hexagonal rods.
Compatible with Trezor, Coldcard, Ledger, Electrum and any other wallets that use mnemonic seeds for backup.
Why Coldbit Steel?
Bitcoin is a remarkable form of decentralized, censorship resistant, sound money. But to reap its benefits people need to properly manage their keys.
Coldbit offers tools and guides that explain how to do proper key management in Bitcoin without relying on third parties (self custody).
Coldbit offers physical, easy to understand security for your Bitcoin keys.
Cold Steel - Physical Security
Stamping steel is the best way to preserve extremely valuable information like your Bitcoin seed.
It may not be as easy as printing a sheet of paper or encrypting a USB drive but it offers unparalleled durability and longevity to those who can do it.
Coldbit means thick, stainless steel plates and hex rods, letter and number stamps made from hardened steel and heavy club hammers rather than vulnerable electronic devices, pieces of paper and trusted third parties.
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Coldbit Steel
€69.00 – €89.00- stores up to 24 words (each word up to 8 letters)
- extra line that can store up to 16 letters for Wallet ID
- 2 stainless steel plates – heat and corrosion resistant (AISI 304)
- 4mm thick stamping plate and 2mm thick cover
- 2 nickel binding posts (countersink hole on the back – the wallet lays flat on the table)
- no loose parts
- metal box
- additional testing plate to practice stamping and provide support
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Coldbit Steel – Samourai Edition
€79.00 – €99.00Samourai Edition of Coldbit Steel.
- stores up to 24 words (each word up to 8 letters). Samourai Wallet by default uses 12 words but can recover 24.
- extra line that can store up to 16 letters for Wallet ID
- 2 stainless steel plates – heat and corrosion resistant (AISI 304)
- 4mm thick stamping plate and 2mm thick cover
- 2 nickel binding posts (countersink hole on the back – the wallet lays flat on the table)
- no loose parts
- metal box
- comes with 1x Coldbit Passphrase included in the price
- additional testing plate to practice stamping and provide support
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Coldbit Steel – Honeycomb
€74.00 – €94.00Honeycomb Limited Edition.
- stores up to 24 words (each word up to 8 letters)
- extra line that can store up to 16 letters for Wallet ID
- 2 stainless steel plates – heat and corrosion resistant (AISI 304)
- 4mm thick stamping plate and 2mm thick cover
- 2 nickel binding posts (countersink hole on the back – the wallet lays flat on the table)
- no loose parts
- metal box
- additional testing plate to practice stamping and provide support
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Coldbit Steel – Spiderweb
€74.00 – €94.00Spiderweb Limited Edition.
- stores up to 24 words (each word up to 8 letters)
- extra line that can store up to 16 letters for Wallet ID
- 2 stainless steel plates – heat and corrosion resistant (AISI 304)
- 4mm thick stamping plate and 2mm thick cover
- 2 nickel binding posts (countersink hole on the back – the wallet lays flat on the table)
- no loose parts
- metal box
- additional testing plate to practice stamping and provide support
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3x Coldbit Steel Bundle
€157.00 – €177.00- 3 Coldbit Steel metal wallets
- you save 50 EUR
- each wallet stores up to 24 words (each word up to 8 letters)
- extra line that can store up to 16 letters for Wallet ID
- each of the 3 wallets has 2 stainless steel plates – heat and corrosion resistant (AISI 304)
- 4mm thick stamping plates and 2mm thick covers
- 2 nickel binding posts (countersink hole on the back – the wallet lays flat on the table)
- no loose parts
- 3 metal boxes for convenient storage
- 1x testing plate to practice stamping and provide support
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Coldbit Hex
€41.00 – €74.00- stores up to 24 mnemonic words
- ideal for storing your wallet seeds, multisig seeds or Shamir Shares
- brass tube with caps for convenient and safe storage
- made of heat and corrosion resistant AISI 304 stainless steel or pure titanium hex rod
- comes with a testing plate by default
- dimensions: 13mm x 100mm
Latest blog posts
How to use a Trezor without leaking your balance and transaction history to third parties
If you own a Trezor wallet (either Trezor One or Trezor Model T) chances are you’ve used the official web wallet. When you use wallet.trezor.io your xpubs are sent to the third party servers (in this case servers owned and operated by Satoshi Labs). This is not ideal because, although I don’t imply SL do […]
Introducing Coldbit Jig
To make stamping Bitcoin seeds onto steel easier we’ve designed and developed Coldbit Jig: This jig has the following features: Better grip/control of the stamping bit (always in straight upright position, no wobble) Prevents the bit from flying across the room and as a consequence protects your eyes Protects your fingers Enables multiple punches in […]
What types of mnemonic seeds are used in Bitcoin?
There are essentially four types of mnemonic seed phrases used in Bitcoin: BIP39 Electrum Shamir Shares (SLIP39) LND (AEZEED) Why do they exist? What makes them different from each other? Can we identify them easily? In this short guide we’ll try to address these questions. What’s the purpose of mnemonic seed phrases? The main purpose […]
Can BIP-39 passphrase be cracked ?
In a recent post about BIP-39 I described how mnemonic sentences in the context of Bitcoin work and what makes them secure. 128 or 256 bit cryptography is considered secure and unbreakable now and for the foreseeable future. It’s the basis on which Bitcoin wallet security depends on. Can the same thing be said about […]
Extreme stress test of Coldbit Steel – will it survive?
Last year (2018) Jameson Lopp performed an extreme stress testing of a few Bitcoin metal wallets (BIP-39 seed backup). At that time Coldbit Steel was in the design phase and I took the first test results into consideration when designing it. This year I’m happy to announce that both Coldbit Steel and Coldbit Passphrase survived […]
BIP-39 basics. From randomness to mnemonic words.
Have you ever wondered how your Bitcoin wallet seed words (mnemonic words) guard access to your wallet funds and what makes such setup secure ? In this article we’ll dive into the basics of BIP-39 which describe what seed words are and how we can use them to backup our wallet keys in a recoverable […]