<s>
Bitcoin	B-Application
Unlimited	I-Application
(	O
BU	O
)	O
is	O
a	O
full	O
node	O
implementation	O
for	O
the	O
bitcoin	B-Protocol
and	O
Bitcoin	B-Protocol
Cash	I-Protocol
networks	O
.	O
</s>
<s>
The	O
Bitcoin	B-Language
Core	I-Language
client	O
,	O
from	O
which	O
Bitcoin	B-Application
Unlimited	I-Application
is	O
forked	B-Application
,	O
has	O
a	O
hard	O
coded	O
one	O
megabyte	O
block	O
limit	O
;	O
Bitcoin	B-Application
Unlimited	I-Application
differs	O
by	O
allowing	O
users	O
to	O
signal	O
which	O
block	O
size	O
limit	O
they	O
prefer	O
,	O
find	O
the	O
limit	O
having	O
a	O
majority	O
consensus	O
and	O
automatically	O
track	O
the	O
largest	O
proof-of-work	O
,	O
regardless	O
of	O
block	O
size	O
.	O
</s>
<s>
However	O
,	O
if	O
a	O
block	O
greater	O
than	O
one	O
megabyte	O
in	O
size	O
is	O
accepted	O
by	O
Bitcoin	B-Application
Unlimited	I-Application
and	O
rejected	O
by	O
nodes	O
with	O
a	O
block	O
size	O
limit	O
,	O
a	O
fork	B-Application
of	O
the	O
network	O
will	O
occur	O
,	O
resulting	O
in	O
two	O
separate	O
blockchains	O
with	O
Bitcoin	B-Application
Unlimited	I-Application
nodes	O
following	O
the	O
chain	O
with	O
the	O
largest	O
proof-of-work	O
.	O
</s>
<s>
The	O
release	O
of	O
Bitcoin	B-Application
Unlimited	I-Application
follows	O
the	O
release	O
of	O
Bitcoin	B-Protocol
XT	I-Protocol
and	O
Bitcoin	B-Protocol
Classic	I-Protocol
,	O
alternative	O
proposals	O
which	O
aimed	O
to	O
increase	O
bitcoin	B-Protocol
's	O
transaction	O
capacity	O
of	O
around	O
2.5-3	O
transactions	O
per	O
second	O
by	O
increasing	O
the	O
hard-coded	O
block	O
size	O
limit	O
.	O
</s>
<s>
As	O
of	O
version	O
1.1.0.0	O
,	O
Bitcoin	B-Application
Unlimited	I-Application
releases	O
are	O
compatible	O
with	O
Bitcoin	B-Protocol
Cash	I-Protocol
,	O
a	O
cryptocurrency	O
that	O
split	O
from	O
bitcoin	B-Protocol
and	O
allows	O
larger	O
blocks	O
.	O
</s>
<s>
Bitcoin	B-Application
Unlimited	I-Application
is	O
an	O
attempt	O
to	O
upgrade	O
Bitcoin	B-Language
Core	I-Language
into	O
a	O
client	O
that	O
processes	O
bitcoin	B-Protocol
transactions	O
into	O
blocks	O
with	O
a	O
potential	O
maximum	O
size	O
greater	O
than	O
the	O
Core	O
's	O
hard-coded	O
limit	O
of	O
one	O
megabyte	O
.	O
</s>
<s>
Per	O
the	O
advocates	O
of	O
the	O
change	O
,	O
a	O
block	O
size	O
increase	O
is	O
needed	O
in	O
order	O
to	O
avoid	O
a	O
workflow	O
bottleneck	B-Application
due	O
to	O
the	O
number	O
of	O
transactions	O
made	O
as	O
bitcoin	B-Protocol
adoption	O
increases	O
.	O
</s>
<s>
With	O
Bitcoin	B-Application
Unlimited	I-Application
,	O
miners	O
are	O
independently	O
able	O
to	O
configure	O
the	O
size	O
of	O
the	O
blocks	O
they	O
will	O
validate	O
.	O
</s>
<s>
Miners	O
using	O
Bitcoin	B-Application
Unlimited	I-Application
continue	O
to	O
process	O
regular-sized	O
blocks	O
but	O
as	O
soon	O
as	O
a	O
block	O
larger	O
than	O
one	O
megabyte	O
is	O
mined	O
,	O
they	O
will	O
follow	O
the	O
chain	O
containing	O
the	O
most	O
work	O
.	O
</s>
<s>
Per	O
the	O
Bitcoin	B-Application
Unlimited	I-Application
website	O
,	O
the	O
scalability	B-Architecture
solution	O
will	O
be	O
found	O
at	O
a	O
focal	O
point	O
.	O
</s>
<s>
Bitcoin	B-Application
Unlimited	I-Application
follows	O
the	O
release	O
of	O
Bitcoin	B-Protocol
XT	I-Protocol
and	O
Bitcoin	B-Protocol
Classic	I-Protocol
,	O
alternative	O
proposals	O
on	O
how	O
to	O
increase	O
bitcoin	B-Protocol
's	O
transaction	O
capacity	O
.	O
</s>
<s>
Developers	O
of	O
Bitcoin	B-Language
Core	I-Language
have	O
been	O
reluctant	O
to	O
increase	O
the	O
block	O
size	O
limit	O
.	O
</s>
