<s>
Peercoin	B-Protocol
,	O
also	O
known	O
as	O
Peer-to-Peer	O
Coin	O
,	O
PP	B-Protocol
Coin	I-Protocol
,	O
or	O
PPC	O
is	O
a	O
cryptocurrency	O
utilizing	O
both	O
proof-of-stake	B-Protocol
and	O
proof-of-work	O
systems	O
.	O
</s>
<s>
Peercoin	B-Protocol
is	O
based	O
on	O
an	O
August	O
2012	O
paper	O
that	O
listed	O
the	O
authors	O
as	O
Scott	O
Nadal	O
and	O
Sunny	O
King	O
.	O
</s>
<s>
Peercoin	B-Protocol
was	O
the	O
first	O
implementation	O
of	O
a	O
proof-of-stake	B-Protocol
–	O
based	O
cryptocurrency	O
.	O
</s>
<s>
The	O
Peercoin	B-Protocol
source	O
code	O
is	O
distributed	O
under	O
the	O
MIT/X11	O
software	O
license	O
.	O
</s>
<s>
Peercoin	B-Protocol
uses	O
both	O
the	O
proof-of-work	O
and	O
proof-of-stake	B-Protocol
algorithms	O
.	O
</s>
<s>
Up	O
to	O
99%	O
of	O
all	O
Peercoins	B-Protocol
is	O
created	O
with	O
PoW	O
.	O
</s>
<s>
Proof-of-stake	B-Protocol
is	O
used	O
to	O
secure	O
the	O
network	O
:	O
The	O
chain	O
with	O
longest	O
PoS	O
coin	O
age	O
wins	O
in	O
case	O
of	O
a	O
blockchain	O
split-up	O
.	O
</s>
