Every transaction in a blockchain is signed by the sender. The signing of transactions is done using cryptographic signing algorithms, as described in episode 6 of the podcast.

In some scenarios, to perform an operation on the blockchain, there is a need to have more than one signatures on a transaction. Think of bank accounts with joint holders. Similarly, blockchain wallets could also be owned jointly by a group of accounts. These wallets are called multi-signature wallets or multi-sigs.

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