How strong is a 24-word seed phrase?

The security offered by seed phrases is a crucial aspect of cryptocurrency wallets. When comparing different lengths of seed phrases, it is evident that 24-word seed phrases provide a higher level of entropy.

Specifically, a 24-word seed phrase offers 256 bits of entropy. This is a significant increase compared to a 12-word phrase, which offers 128 bits of entropy. The additional entropy is meant to enhance the theoretical security of the wallet.

Despite the doubled entropy, the practical security gain from using a 24-word phrase over a 12-word one is not as substantial as the numbers suggest. This is because the effective security of a wallet is influenced by various factors beyond the length of the seed phrase.

One such factor is the underlying cryptography used by the wallet. In the case of Bitcoin, the elliptic curve cryptography (secp256k1) is used. The effective security of this cryptography is 128 bits, regardless of the length of the seed phrase.

BTCC, a top cryptocurrency exchange, offers a range of services that cater to the needs of cryptocurrency users. These services include spot trading, futures trading, and wallet services. With a focus on security, BTCC ensures that its wallet services are robust and reliable.