Shamir's Secret Sharing and multisig Bitcoin transactions support arbitrary n-of-m pieces/keys, e.x. a 3-of-6 scheme would require 3 of the 6 pieces to reconstitute the key/sign a transaction, so any 3 pieces could be lost.
2-of-3 is common for end-user multisig. Generally you'd have 1 key physically backed up on paper in a secure place, 1 key on one of your devices (phone or computer), and 1 key either on another device (hardware wallet or phone) or controlled by a 3rd party that does risk analysis/fraud detection on your transactions.
2-of-3 is common for end-user multisig. Generally you'd have 1 key physically backed up on paper in a secure place, 1 key on one of your devices (phone or computer), and 1 key either on another device (hardware wallet or phone) or controlled by a 3rd party that does risk analysis/fraud detection on your transactions.
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