Multisignature (multi-signature) is a digital signature
Usually, a multisignature algorithm produces a joint signature that is more compact than a collection of distinct signatures from all users.
Multisignature adds additional security for cryptocurrency transactions. Multisig crypto wallets require all parties involved in the creation of this type of wallet to agree before any transaction can occur.
Standard transactions on the BitcoinBitcoin1$ 26,362.610.18%-6.01%-15.89%details network could be called “single-signature transactions” because transfers require only one signature — from the owner of the private key associated with the Bitcoin address.
However, the Bitcoin network supports much more complicated transactions that require the signatures of multiple people before the funds can be transferred. These are often referred to as m-of-n transactions.
These parties can be people, institutions or programmed scripts.
Multi-signatureon Wikipedia
Multisignature Wallets Can Keep Your Coins Safer (If You Use Them Right)by Colin Harper
One person's "paranoia" is another person's "engineering redundancy."
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