The ‘v1’ and ‘v2’ coins were released
after the initial ‘v0.1’ test
batch. This coin uses a slightly
higher denomination of fifty millibitcoins,
which is the equivalent
of 0.05 BTC.
Worth mentioning is that the v0.1,
v1, and v2 coins are the first coins
to contain no numeric private
key, with a QR code instead being
utilized. This has served as inspiration
for both bhCoin and Titan
Bitcoins. Another notable factor is
that these coins often have ‘firstbits’
of only five or six characters,
instead of the traditional eight.