<s>
A	O
distributed	B-Application
search	I-Application
engine	I-Application
is	O
a	O
search	B-Application
engine	I-Application
where	O
there	O
is	O
no	O
central	O
server	O
.	O
</s>
<s>
Unlike	O
traditional	O
centralized	O
search	B-Application
engines	I-Application
,	O
work	O
such	O
as	O
crawling	B-Application
,	O
data	B-Application
mining	I-Application
,	O
indexing	O
,	O
and	O
query	O
processing	O
is	O
distributed	B-Architecture
among	O
several	O
peers	O
in	O
a	O
decentralized	O
manner	O
where	O
there	O
is	O
no	O
single	O
point	O
of	O
control	O
.	O
</s>
<s>
The	O
short-term	O
goal	O
of	O
the	O
Rorur	O
project	O
is	O
to	O
create	O
a	O
distributed	B-Application
search	I-Application
engine	I-Application
that	O
runs	O
on	O
a	O
network	O
of	O
computers	O
of	O
common	O
people	O
in	O
a	O
decentralized	O
fashion	O
.	O
</s>
<s>
To	O
incentivize	O
those	O
who	O
join	O
and	O
contribute	O
,	O
the	O
revenue	O
from	O
advertising	O
is	O
distributed	B-Architecture
among	O
node	O
maintainers	O
.	O
</s>
<s>
Started	O
in	O
2017	O
,	O
Presearch	O
is	O
an	O
ERC20	O
powered	O
(	O
PRE	O
)	O
search	B-Application
engine	I-Application
powered	O
by	O
a	O
distributed	B-Architecture
network	O
of	O
community	O
operated	O
nodes	O
which	O
aggregate	O
results	O
from	O
a	O
variety	O
of	O
sources	O
.	O
</s>
<s>
On	O
Sept	O
1	O
,	O
2021	O
,	O
Presearch	O
was	O
added	O
as	O
a	O
default	O
option	O
to	O
the	O
search	B-Application
engine	I-Application
list	O
on	O
Android	O
for	O
the	O
EU	O
.	O
</s>
<s>
On	O
December	O
15	O
,	O
2003	O
Michael	O
Christen	O
announced	O
development	O
of	O
a	O
P2P-based	O
search	B-Application
engine	I-Application
,	O
eventually	O
named	O
YaCy	B-Application
,	O
on	O
the	O
heise	O
online	O
forums	O
.	O
</s>
<s>
A	O
theoretical	O
design	O
for	O
a	O
distributed	B-Application
search	I-Application
engine	I-Application
discussed	O
in	O
academic	O
literature	O
.	O
</s>
<s>
Seeks	O
was	O
an	O
open	O
source	O
websearch	B-Application
proxy	O
and	O
collaborative	O
distributed	B-Architecture
tool	O
for	O
websearch	B-Application
.	O
</s>
<s>
In	O
April	O
2000	O
several	O
programmers	O
(	O
including	O
Gene	O
Kan	O
,	O
Steve	O
Waterhouse	O
)	O
built	O
a	O
prototype	O
P2P	O
web	B-Application
search	I-Application
engine	I-Application
based	O
on	O
Gnutella	B-Protocol
called	O
InfraSearch	O
.	O
</s>
<s>
The	O
technology	O
was	O
later	O
acquired	O
by	O
Sun	O
Microsystems	O
and	O
incorporated	O
into	O
the	O
JXTA	B-Language
project	O
.	O
</s>
<s>
On	O
May	O
31	O
,	O
2000	O
Steelbridge	O
Inc	O
.	O
announced	O
development	O
of	O
OpenCOLA	O
a	O
collaborative	O
distributive	O
open	O
source	O
search	B-Application
engine	I-Application
.	O
</s>
<s>
In	O
February	O
2001	O
Wolf	O
Garbe	O
published	O
an	O
idea	O
of	O
a	O
peer-to-peer	B-Application
search	I-Application
engine	I-Application
,	O
</s>
<s>
The	O
goals	O
of	O
building	O
a	O
distributed	B-Application
search	I-Application
engine	I-Application
include	O
:	O
</s>
<s>
1	O
.	O
to	O
create	O
an	O
independent	O
search	B-Application
engine	I-Application
powered	O
by	O
the	O
community	O
;	O
</s>
<s>
The	O
latency	O
of	O
the	O
distributed	B-Architecture
operation	O
must	O
be	O
competitive	O
with	O
the	O
latency	O
of	O
the	O
commercial	O
search	B-Application
engines	I-Application
.	O
</s>
<s>
A	O
mechanism	O
that	O
prevents	O
malicious	O
users	O
from	O
corrupting	O
the	O
distributed	B-Architecture
data	O
structures	O
or	O
the	O
rank	O
needs	O
to	O
be	O
developed	O
.	O
</s>
