Abstract: In certain embodiments, the use of re-usable cold storage keys to sign messages may be facilitated. In some embodiments, an offline computer system (operating within an offline computing environment) may obtain, from a removable computer-readable storage medium, signing key shards corresponding to a signing private key and a blockchain transaction to be signed, where the signing key shards satisfy a key shard threshold that is (i) a number of key shards required for reconstructing the signing private key and (ii) less than a number of key shards derived from the signing private key using a ceremony key. The offline computer system may form a ciphertext of the signing private key using the signing key shards and reconstruct the signing private key by decrypting the ciphertext using the ceremony key. The offline computer system may sign the blockchain transaction using the signing private key.

Abstract: Aspects of the disclosure relate to storing sensitive information. A computing platform may split a signature key into shares, which may be used to regenerate the signature key. The computing platform may encrypt these shares using corresponding SEKs, and may subsequently encrypt the SEKs using corresponding operator keys. The computing platform may distribute the operator keys to user devices via corresponding HSMs. The computing platform may store the encrypted shares, encrypted SEKs, and identifiers of the user devices. The computing platform may receive requests for the encrypted SEKs from the user devices, and may send the respective encrypted SEKs accordingly. The user devices may return, to the computing platform, corresponding decrypted SEKs. The computing platform may use the SEKs to decrypt the encrypted shares, which may then be used to reconstruct the signature key.

Abstract: Aspects of the disclosure relate to storing sensitive information. A computing platform may split a signature key into shares, which may be used to regenerate the signature key. The computing platform may encrypt these shares using corresponding SEKs, and may subsequently encrypt the SEKs using corresponding operator keys. The computing platform may distribute the operator keys to user devices via corresponding HSMs. The computing platform may store the encrypted shares, encrypted SEKs, and identifiers of the user devices. The computing platform may receive requests for the encrypted SEKs from the user devices, and may send the respective encrypted SEKs accordingly. The user devices may return, to the computing platform, corresponding decrypted SEKs. The computing platform may use the SEKs to decrypt the encrypted shares, which may then be used to reconstruct the signature key.

Abstract: Aspects of the disclosure relate to processing cryptocurrency transactions. A computing platform may receive a transaction request. The computing platform may request SEKs from operator devices, and may receive requests to download encrypted SEKs accordingly. The computing platform may send the encrypted SEKs, and may receive corresponding decrypted SEKs from the operator devices in response. The computing platform may decrypt encrypted shares using the SEKs, and may use the decrypted shares to reconstruct a cryptographic signing key. The computing platform may validate the cryptographic signing key, and based on successful validation of the cryptographic signing key, may transfer authorize the requested transaction.

Abstract: Systems and methods for signing messes using re-usable cold storage keys.