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From: Guido Dassori <guido.dassori@gmail.com>
Date: Tue, 28 Aug 2018 19:51:11 +0200
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Subject: Re: [bitcoin-dev] Building a Bitcoin API and query system.
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Hi Sumit,

There's no protocol api to fetch a single transaction over the p2p network.
You can query peers for mempool transactions, but once there are into a
block, no way to obtain them without fetching the entire block.

Also, you may want to take a look to spruned (
https://github.com/gdassori/spruned), it uses both the electrum & the p2p
network to do the same job you are researching on. It serves the data by
emulating some of the bitcoind rpc api, to be suitable by bitcoind backed
applications.

Guido

Il giorno mar 28 ago 2018 alle ore 19:41 Blockchain Group via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> ha scritto:

> Thanks, I'll check it out.
>
> On Tue, Aug 28, 2018, 9:17 PM Matias Alejo Garcia <ematiu@gmail.com>
> wrote:
>
>> Hi Sumit,
>>
>> Take a look at https://github.com/bitpay/bitcore/tree/v8.0.0, it is a
>> bitcoin indexing API server, with several modules, like a block explorer=
, a
>> wallet module, etc. It is built using Node.js.
>>
>> mat=C3=ADas
>>
>> On Tue, Aug 28, 2018 at 12:43 PM Joseph Gleason =E2=91=88 via bitcoin-de=
v <
>> bitcoin-dev@lists.linuxfoundation.org> wrote:
>>
>>> For what it is worth, electrum has a lot or possibly all of what you ar=
e
>>> talking about since the electrum servers are designed to quickly answer=
 the
>>> queries of light clients.  So right now, you could sync up an electrum
>>> server or use an existing public one and send queries to it with json-r=
pc.
>>>
>>>
>>> https://github.com/kyuupichan/electrumx/blob/master/docs/protocol-metho=
ds.rst
>>>
>>>
>>> On Tue, Aug 28, 2018 at 5:36 AM Blockchain Group via bitcoin-dev <
>>> bitcoin-dev@lists.linuxfoundation.org> wrote:
>>>
>>>> Hello everyone,
>>>>
>>>> I am C++ & Node.js developer. I want to propose making a new Bitcoin
>>>> API that supports fast quering of Bitcoin blocks and transactions with=
out
>>>> the need for syncing with all previous nodes.
>>>>
>>>> In a typical case where I want to build a full fleged Bitcoin explorer
>>>> cum wallet system on my end with external APIs, I need to sync my node=
 and
>>>> then query for the information I need to show separately. I am proposi=
ng a
>>>> unified method of finding/quering the blockchain data with a standardi=
zed
>>>> template containing minimal information about the actual mined block o=
r
>>>> transaction yet satify the need of what I want to query.
>>>>
>>>> I am working on making a template and a support mechanism on Node.js. =
I
>>>> want to propose it as an improvement (BIP). It will be a great help to
>>>> future web developers who want to make something similar.
>>>>
>>>> Thanks
>>>> Sumit Lahiri.
>>>> _______________________________________________
>>>> bitcoin-dev mailing list
>>>> bitcoin-dev@lists.linuxfoundation.org
>>>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>>>>
>>> _______________________________________________
>>> bitcoin-dev mailing list
>>> bitcoin-dev@lists.linuxfoundation.org
>>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>>>
>>
>>
>> --
>> Mat=C3=ADas Alejo Garcia
>> @ematiu
>> Roads? Where we're going, we don't need roads!
>>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

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<div dir=3D"ltr"><div>Hi Sumit,=C2=A0</div><div><br></div><div>There&#39;s =
no protocol api to fetch a single transaction over the p2p network.=C2=A0</=
div><div>You can query peers for mempool transactions, but once there are i=
nto a block, no way to obtain them without fetching the entire block.</div>=
<div><br></div><div>Also, you may want to take a look to spruned (<a href=
=3D"https://github.com/gdassori/spruned">https://github.com/gdassori/sprune=
d</a>), it uses both the electrum &amp; the p2p network to do the same job =
you are researching on. It serves the data by emulating some of the bitcoin=
d rpc api, to be suitable by bitcoind backed applications.</div><div><br></=
div><div>Guido</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">I=
l giorno mar 28 ago 2018 alle ore 19:41 Blockchain Group via bitcoin-dev &l=
t;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@list=
s.linuxfoundation.org</a>&gt; ha scritto:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"><div dir=3D"auto">Thanks, I&#39;ll check it out.=C2=A0</div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Aug 28, 2018, 9:17 PM Matia=
s Alejo Garcia &lt;<a href=3D"mailto:ematiu@gmail.com" target=3D"_blank">em=
atiu@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
dir=3D"ltr">Hi Sumit,<div><br></div><div>Take a look at=C2=A0<a href=3D"htt=
ps://github.com/bitpay/bitcore/tree/v8.0.0" rel=3D"noreferrer" target=3D"_b=
lank">https://github.com/bitpay/bitcore/tree/v8.0.0</a>, it is a bitcoin in=
dexing API server, with several modules, like a block explorer, a wallet mo=
dule, etc. It is built using Node.js.</div><div><br></div><div>mat=C3=ADas<=
/div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Aug 28, =
2018 at 12:43 PM Joseph Gleason =E2=91=88 via bitcoin-dev &lt;<a href=3D"ma=
ilto:bitcoin-dev@lists.linuxfoundation.org" rel=3D"noreferrer" target=3D"_b=
lank">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div dir=3D"ltr">For what it is worth, electrum has=
 a lot or possibly all of what you are talking about since the electrum ser=
vers are designed to quickly answer the queries of light clients.=C2=A0 So =
right now, you could sync up an electrum server or use an existing public o=
ne and send queries to it with json-rpc.<div><br></div><div><a href=3D"http=
s://github.com/kyuupichan/electrumx/blob/master/docs/protocol-methods.rst" =
rel=3D"noreferrer" target=3D"_blank">https://github.com/kyuupichan/electrum=
x/blob/master/docs/protocol-methods.rst</a><br></div><div><br></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Aug 28, 2018 at 5:36=
 AM Blockchain Group via bitcoin-dev &lt;<a href=3D"mailto:bitcoin-dev@list=
s.linuxfoundation.org" rel=3D"noreferrer" target=3D"_blank">bitcoin-dev@lis=
ts.linuxfoundation.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><div dir=3D"auto">Hello everyone,<div dir=3D"auto"><br></div><div dir=3D=
"auto">I am C++ &amp; Node.js developer. I want to propose making a new Bit=
coin API that supports fast quering of Bitcoin blocks and transactions with=
out the need for syncing with all previous nodes.=C2=A0</div><div dir=3D"au=
to"><br></div><div dir=3D"auto">In a typical case where I want to build a f=
ull fleged Bitcoin explorer cum wallet system on my end with external APIs,=
 I need to sync my node and then query for the information I need to show s=
eparately. I am proposing a unified method of finding/quering the blockchai=
n data with a standardized template containing minimal information about th=
e actual mined block or transaction yet satify the need of what I want to q=
uery.=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">I am working=
 on making a template and a support mechanism on Node.js. I want to propose=
 it as an improvement (BIP). It will be a great help to future web develope=
rs who want to make something similar.=C2=A0</div><div dir=3D"auto"><br></d=
iv><div dir=3D"auto">Thanks=C2=A0</div><div dir=3D"auto">Sumit Lahiri.=C2=
=A0</div></div>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" rel=3D"noreferrer"=
 target=3D"_blank">bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer noreferrer" target=3D"_blank">https://lists.linuxfoundati=
on.org/mailman/listinfo/bitcoin-dev</a><br>
</blockquote></div>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" rel=3D"noreferrer"=
 target=3D"_blank">bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer noreferrer" target=3D"_blank">https://lists.linuxfoundati=
on.org/mailman/listinfo/bitcoin-dev</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"m_-5351541024847585838m_5598967342637625863gmail_signature" data-=
smartmail=3D"gmail_signature"><div dir=3D"ltr">Mat=C3=ADas Alejo Garcia<br>=
@ematiu<br>Roads? Where we&#39;re going, we don&#39;t need roads!</div></di=
v>
</blockquote></div>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
man/listinfo/bitcoin-dev</a><br>
</blockquote></div>

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