A registration shows its name to the mempool before it is mined, and
"first REG wins" gives the name to whoever copies it with a better fee.
A registrant can now publish a hash first (CMT) and reveal a block later:
the REG carries the salt, and counts only if a commit of
sha256(salt, name, certificate lock) is already 1..144 blocks deep.
Someone who learns the name from the reveal has no such commit.
Who wins a contested name: the first valid REG opens a window of six
blocks, and within it the REG with the oldest commit takes the name; a REG
without a commit ranks by its own block. After the window the registration
is final. The addendum first let an older commit win for as long as the
commit lived, which left every registration open for a week and let a
standing commit beat any buyer; and a commit now lives a day, so keeping
one alive costs more than owning the name.
Optional on chipnet, where plain registrations keep working exactly as
before (the live registry reduces to the same index). Required on mainnet,
which starts empty. A registration straight into the covenant commits to
the covenant address, fixing owner and expiry at commit time.
One implementation for the JavaScript reducers; the Android reducer is now
a pure function and agrees with it on every history the tests build.
