Good question!

To my knowledge, when it comes to a final multisig and the end result of the "addition" of signatures, you'll get another value on the elliptic curve, which results in having the same bits of entropy.

In theory, a 1 of 1 multisig and a 3 of 3 multisig have the same mathematical security. This is because both constructions rely on the same principles of elliptic curve cryptography (ECC).

In practice, if you want to crack a specific 3 of 3 multisig, you would need to obtain the three public keys first. Then, you would need "impossibility luck" for three consecutive times in order to succeed.

For further exploration and insights into this topic, I recommend checking out Programming Bitcoin by Jimmy Song. He provides a great introduction to elliptic curves in his book.

#Bitcoin