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To generate 12 phrases mnemonic, it’s important to seed 128bits(16bytes). It isn’t a advice however rule.
Beneath is detailed rationalization from BIP39.
The mnemonic should encode entropy in a a number of of 32 bits. With extra entropy safety is improved however the sentence size will increase. We confer with the preliminary entropy size as ENT. The allowed dimension of ENT is 128-256 bits.
First, an preliminary entropy of ENT bits is generated. A checksum is
generated by taking the primary ENT / 32 bits of its SHA256 hash. This
checksum is appended to the tip of the preliminary entropy. Subsequent, these
concatenated bits are cut up into teams of 11 bits, every encoding a
quantity from 0-2047, serving as an index right into a wordlist. Lastly, we
convert these numbers into phrases and use the joined phrases as a
mnemonic sentence.
The next desk describes the relation between the preliminary entropy
size (ENT), the checksum size (CS), and the size of the
generated mnemonic sentence (MS) in phrases.
CS = ENT / 32 MS = (ENT + CS) / 11 | ENT | CS | ENT+CS | MS | +-------+----+--------+------+ | 128 | 4 | 132 | 12 | | 160 | 5 | 165 | 15 | | 192 | 6 | 198 | 18 | | 224 | 7 | 231 | 21 | | 256 | 8 | 264 | 24 |
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