Chained Future Cold wallet datasheets

Features · 6 sheets

Features, wallet by wallet

Each sheet takes one feature or standard and lists every wallet we track with what its maker documents about it, the page that says so and the date we checked it.

Sheets
6
Wallets per sheet
26
Data generated
Last checked

  1. Multisig hardware wallets: how M-of-N works and who supports it

    A multisig wallet needs M of its N keys, for example 2 of 3, to approve a Bitcoin transaction, so in a 2-of-3 setup one stolen key cannot spend alone, and one lost key does not lock you out as long as you still have the other two and the wallet's configuration. Most hardware wallets we track act as signers for separate coordinator software such as Sparrow, Electrum or Casa, while Bitkey and Blockstream's app build the coordinator in.

    19 of 26 wallets document multisig support · 22 rows sourced · rev.

    Yes 19No 3Not documented 4

  2. Bluetooth hardware wallets

    Bluetooth hardware wallets such as the Ledger Nano X, Trezor Safe 7 and BitBox02 Nova talk to a phone by radio, and their makers say private keys never cross that link: a separate chip relays the data, and every transaction still needs approval on the device itself. The cost is one more interface that can have bugs and can be reached from nearby; COLDCARD, NGRAVE, ELLIPAL and others leave Bluetooth out.

    10 of 26 wallets document a Bluetooth connection · 24 rows sourced · rev.

    Yes 10No 14Not documented 2

  3. BIP39 passphrase: the 25th word, hidden wallets and how makers differ

    A BIP39 passphrase is an optional secret mixed with your recovery phrase when the wallet derives its seed, so the same words open a different, hidden wallet for every passphrase. A strong one protects you if someone finds your written words (a weak one can be guessed), but there is no wrong passphrase and no reset: a typo opens another wallet, and a forgotten passphrase can put the funds behind it out of reach.

    24 of 26 wallets document passphrase support · 24 rows sourced · rev.

    Yes 24No 0Not documented 2

  4. SLIP-39 Shamir backup: shares, thresholds and wallet support

    A SLIP-39 Shamir backup splits a wallet's master secret into several word lists (shares) and lets you choose how many are needed to restore it, for example any 2 of 3. Fewer shares than that reveal nothing about the secret. Trezor (except the Model One), Keystone and OneKey document SLIP-39. The other makers in the table document BIP39 phrases, seedless or their own backup formats instead, and COLDCARD, Ledger and Foundation offer splitting schemes that are not SLIP-39.

    6 of 26 wallets document SLIP-39 Shamir backup · 15 rows sourced · rev.

    Yes 6No 9Not documented 11

  5. BIP39: how a recovery phrase becomes a wallet

    BIP39 is the Bitcoin standard that turns 128 to 256 bits of randomness into 12 to 24 words from a fixed list of 2,048, with a checksum built into the last word, and then turns those words into the seed every key and address comes from. Most hardware wallets with a datasheet here create a BIP39 phrase by default; Trezor's Safe models, BitBox, Tangem, NGRAVE and Passport Prime offer one as an option, and Bitkey has no phrase at all.

    17 of 26 wallets document BIP39 recovery phrases · 26 rows sourced · rev.

    Yes 17Partial 8No 1Not documented 0

  6. Open-source hardware wallets: who publishes the firmware

    Open-source firmware means the code that runs on the device is published under a licence that lets anyone read, build and reuse it. Trezor, OneKey, Blockstream and KeepKey publish theirs; BitBox and Foundation publish theirs with one component under a restrictive licence, Ledger keeps its secure element OS closed while publishing apps, COLDCARD's code is source-available rather than open source, and Tangem and ELLIPAL say their firmware is closed. Published code lets anyone check it, which is not the same as someone having done so.

    8 of 26 wallets document open-source firmware · 24 rows sourced · rev.

    Yes 8Partial 13No 3Not documented 2

Counts come from each sheet's support table: one row per wallet with a datasheet, sourced to the maker's own documentation. "Not documented" means we found no statement either way.