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Adi Shamir’s Secret Sharing* is a cryptographic algorithm that allows distinct parties to jointly share ownership of a single secret by holding *shares*. The original secret can only be reconstructed by using a minimum number of shares, which allows different parties to cooperate without the need to fully trust one another. The family creates four shares and sets a threshold of three, with the Bitcoin key as the original secret. Every Shamir sharing scheme has a total of shares and a threshold.