<s>
The	O
Poly	B-Protocol
Network	I-Protocol
exploit	I-Protocol
was	O
an	O
attack	O
conducted	O
by	O
anonymous	O
hackers	O
on	O
August	O
10	O
,	O
2021	O
.	O
</s>
<s>
It	O
was	O
one	O
of	O
the	O
largest	O
security	O
incidents	O
in	O
DeFi	B-Protocol
's	O
history	O
in	O
terms	O
of	O
mark-to-market	O
value	O
.	O
</s>
<s>
Poly	O
Network	O
is	O
an	O
interoperability	O
protocol	O
that	O
lets	O
users	O
trade	O
one	O
cryptocurrency	O
for	O
another	O
,	O
such	O
as	O
trading	O
Bitcoin	B-Protocol
for	O
Ethereum	B-Application
.	O
</s>
<s>
The	O
hackers	O
transferred	O
approximately	O
$610	O
million	O
of	O
the	O
most	O
valuable	O
digital	O
assets	O
to	O
three	O
addresses	O
they	O
controlled	O
on	O
Ethereum	B-Application
,	O
Binance	O
Smart	O
Chain	O
and	O
Polygon	O
.	O
</s>
<s>
After	O
the	O
attack	O
,	O
the	O
Poly	O
team	O
asked	O
exchanges	O
and	O
miners	O
to	O
be	O
aware	O
of	O
the	O
flow	O
of	O
stolen	O
tokens	O
and	O
called	O
for	O
the	O
hacker	O
's	O
transactions	O
to	O
be	O
stopped	O
,	O
Tether	B-Application
froze	O
$33	O
million	O
worth	O
of	O
USDT	O
.	O
</s>
<s>
In	O
an	O
open	O
letter	O
on	O
Twitter	B-Application
,	O
the	O
Poly	O
team	O
wanted	O
to	O
establish	O
communication	O
with	O
the	O
hackers	O
and	O
urge	O
them	O
to	O
return	O
the	O
stolen	O
tokens	O
.	O
</s>
