Nunchuk

A Bitcoin-only wallet is a cryptocurrency wallet that supports only Bitcoin (BTC), excluding other cryptocurrencies like Ethereum or altcoins.

Multisig (multi-signature) is a security feature that requires multiple private keys to authorize a transaction, enhancing protection against unauthorized access in blockchain networks.

A private key is the secret number that proves ownership of a crypto address and signs its transactions. Whoever has it controls the funds.

A hardware wallet is a dedicated device that keeps private keys offline and signs transactions internally, so the keys never reach an internet-connected computer or phone.

Coldcard is an air-gapped hardware wallet for Bitcoin, made by Coinkite, that stores private keys offline and signs transactions without internet exposure.

Jade is a hardware wallet from Blockstream, designed to securely store Bitcoin private keys offline, ensuring safe transactions and protection from online threats.

Keystone is a brand of hardware wallets that sign transactions air-gapped through QR codes; the current model is the Keystone 3 Pro.

Ledger is a brand of hardware wallets that securely store cryptocurrency private keys offline, such as the Ledger Nano series.

Trezor is a hardware wallet by SatoshiLabs. It stores private keys offline to secure cryptocurrencies.

QR Code Signing is a method used in cryptocurrency transactions where a QR code is generated to confirm and sign a transaction, enhancing security and user convenience.

NFC Connectivity in cryptocurrency enables contactless transactions using near-field communication, allowing users to sign or authorize actions by tapping their device to a reader.

Inheritance planning for crypto arranges how heirs can reach self-custodied coins after the owner's death, using documented backups, Shamir shares, multisig or timelocks.

Collaborative custody is a multisig setup in which the user holds most keys and a company holds one, to help with recovery but not to spend alone.

A mnemonic phrase is a set of words that stores a cryptocurrency wallet's private keys, allowing users to recover access if lost.

Recovery is the process of restoring access to a cryptocurrency wallet using its seed phrase or mnemonic backup if the original wallet is lost or inaccessible.

A cosigner is one of multiple parties in a multisig wallet who signs transactions with their private key. All required cosigners must approve before the transaction executes.

A public key is computed from a private key and lets anyone verify its signatures. Addresses are derived from public keys; knowing one does not allow spending.

A derivation path is a string of indices (e.g., m/44'/0'/0'/0) that specifies how to derive specific keys and addresses from a hierarchical deterministic (HD) wallet's master seed.