<s>
The	O
blockchain-based	B-General_Concept
database	I-General_Concept
is	O
a	O
combination	O
of	O
traditional	O
database	O
and	O
distributed	B-Operating_System
database	I-Operating_System
where	O
data	O
is	O
transacted	O
and	O
recorded	O
via	O
Database	O
Interface	O
(	O
also	O
known	O
as	O
Compute	O
Interface	O
)	O
supported	O
by	O
multiple-layers	O
of	O
blockchains	B-Application
.	O
</s>
<s>
In	O
actual	O
case	O
,	O
the	O
blockchain	B-Application
essentially	O
has	O
no	O
querying	O
abilities	O
when	O
compared	O
to	O
traditional	O
database	O
and	O
with	O
a	O
doubling	O
of	O
nodes	B-Protocol
,	O
network	O
traffic	O
quadruples	O
with	O
no	O
improvement	O
in	O
throughput	O
,	O
latency	O
,	O
or	O
capacity	O
.	O
</s>
<s>
To	O
overcome	O
these	O
shortcomings	O
,	O
taking	O
a	O
traditional	O
database	O
and	O
adding	O
blockchain	B-Application
features	O
to	O
it	O
sounds	O
more	O
feasible	O
.	O
</s>
<s>
That	O
's	O
how	O
the	O
concept	O
of	O
blockchain-based	B-General_Concept
database	I-General_Concept
came	O
into	O
existence	O
,	O
which	O
consists	O
of	O
multiple	O
member	O
clouds	O
riding	O
on	O
two	O
primary	O
layers	O
;	O
the	O
first	O
one	O
is	O
Database	O
Interface	O
and	O
the	O
second	O
one	O
is	O
the	O
Blockchain	B-Application
Anchoring	O
.	O
</s>
<s>
The	O
idea	O
behind	O
the	O
blockchain	B-General_Concept
based	I-General_Concept
database	I-General_Concept
concept	O
is	O
to	O
complement	O
the	O
functionality	O
and	O
features	O
of	O
SQL	B-Application
and	O
NoSQL	B-General_Concept
databases	O
with	O
blockchain	B-Application
properties	O
:	O
data	O
immutability	O
,	O
integrity	O
assurance	O
,	O
decentralized	O
control	O
,	O
Byzantine	B-Operating_System
fault	I-Operating_System
tolerance	I-Operating_System
and	O
transaction	O
traceability	O
.	O
</s>
<s>
Blockchain	B-Application
relational	B-Application
database	I-Application
–	O
a	O
hybrid	O
database	O
model	O
.	O
</s>
<s>
Graphchain	O
Database	O
–	O
a	O
standard	O
RDF	B-Application
Graph	I-Application
database	I-Application
protected	O
by	O
a	O
Blockchain	B-Application
.	O
</s>
