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hi<00:00:16.890><c> everybody</c><00:00:17.220><c> I</c><00:00:17.640><c> am</c><00:00:17.820><c> Thomas</c><00:00:18.270><c> Bethany</c><00:00:18.660><c> and</c><00:00:18.930><c> I</c>

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hi everybody I am Thomas Bethany and I
 

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hi everybody I am Thomas Bethany and I
try<00:00:19.859><c> to</c><00:00:19.920><c> briefly</c><00:00:20.840><c> explain</c><00:00:21.840><c> what</c><00:00:21.869><c> the</c><00:00:22.350><c> point</c><00:00:22.560><c> of</c>

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try to briefly explain what the point of
 

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try to briefly explain what the point of
Oracle<00:00:23.160><c> is</c><00:00:23.430><c> so</c><00:00:24.320><c> we</c><00:00:25.320><c> keep</c><00:00:25.500><c> talking</c><00:00:25.650><c> about</c><00:00:26.070><c> the</c>

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Oracle is so we keep talking about the
 

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Oracle is so we keep talking about the
potentials<00:00:27.090><c> of</c><00:00:27.269><c> smart</c><00:00:27.779><c> contracts</c><00:00:28.230><c> but</c><00:00:29.240><c> one</c><00:00:30.240><c> of</c>

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potentials of smart contracts but one of
 

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potentials of smart contracts but one of
the<00:00:30.510><c> main</c><00:00:30.630><c> limitations</c><00:00:31.170><c> of</c><00:00:31.380><c> smart</c><00:00:31.650><c> contracts</c>

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the main limitations of smart contracts
 

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the main limitations of smart contracts
is<00:00:32.219><c> that</c><00:00:32.279><c> we</c><00:00:32.700><c> have</c><00:00:32.790><c> to</c><00:00:32.940><c> rely</c><00:00:33.210><c> on</c><00:00:33.420><c> on</c><00:00:33.989><c> chain</c><00:00:34.290><c> data</c>

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is that we have to rely on on chain data
 

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is that we have to rely on on chain data
only<00:00:34.800><c> so</c><00:00:35.430><c> in</c><00:00:35.610><c> the</c><00:00:35.700><c> previous</c><00:00:35.940><c> presentations</c>

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only so in the previous presentations
 

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only so in the previous presentations
they<00:00:37.079><c> already</c><00:00:37.290><c> seen</c><00:00:37.649><c> something</c><00:00:38.160><c> like</c><00:00:38.300><c> BTC</c>

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they already seen something like BTC
 

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they already seen something like BTC
relay<00:00:39.540><c> or</c><00:00:39.840><c> other</c><00:00:40.410><c> prize</c><00:00:40.800><c> feeds</c><00:00:41.129><c> which</c><00:00:42.059><c> are</c>

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relay or other prize feeds which are
 

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relay or other prize feeds which are
essentially<00:00:42.719><c> from</c><00:00:42.899><c> contracts</c><00:00:43.500><c> from</c><00:00:43.649><c> where</c>

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essentially from contracts from where
 

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essentially from contracts from where
you<00:00:44.879><c> can</c><00:00:45.030><c> get</c><00:00:45.270><c> some</c><00:00:45.570><c> data</c><00:00:46.469><c> which</c><00:00:47.190><c> should</c><00:00:47.489><c> be</c>

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you can get some data which should be
 

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you can get some data which should be
updated<00:00:47.760><c> by</c><00:00:48.329><c> an</c><00:00:48.510><c> external</c><00:00:49.010><c> data</c><00:00:50.010><c> provider</c><00:00:50.399><c> so</c>

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updated by an external data provider so
 

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updated by an external data provider so
essentially<00:00:51.239><c> this</c><00:00:51.329><c> means</c><00:00:51.629><c> that</c><00:00:51.870><c> there</c><00:00:52.320><c> is</c><00:00:52.440><c> a</c>

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essentially this means that there is a
 

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essentially this means that there is a
party<00:00:52.949><c> an</c><00:00:53.190><c> external</c><00:00:53.789><c> centralized</c><00:00:54.270><c> party</c><00:00:54.690><c> that</c>

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party an external centralized party that
 

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party an external centralized party that
is<00:00:55.260><c> pushing</c><00:00:55.590><c> some</c><00:00:56.280><c> data</c><00:00:56.520><c> in</c><00:00:57.059><c> with</c><00:00:57.809><c> some</c>

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is pushing some data in with some
 

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is pushing some data in with some
cryptographic<00:00:58.469><c> proof</c><00:00:59.010><c> to</c><00:00:59.910><c> this</c><00:01:00.390><c> contract</c><00:01:00.930><c> so</c>

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cryptographic proof to this contract so
 

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cryptographic proof to this contract so
that<00:01:01.559><c> you</c><00:01:01.710><c> can</c><00:01:01.890><c> fetch</c><00:01:02.100><c> this</c><00:01:02.340><c> information</c><00:01:02.910><c> from</c>

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that you can fetch this information from
 

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that you can fetch this information from
another<00:01:03.329><c> contract</c><00:01:03.809><c> so</c><00:01:04.589><c> the</c><00:01:04.799><c> approach</c><00:01:05.010><c> of</c>

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another contract so the approach of
 

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another contract so the approach of
Oracle<00:01:05.489><c> eyes</c><00:01:05.580><c> is</c><00:01:05.880><c> rightly</c><00:01:06.119><c> different</c><00:01:07.490><c> what</c><00:01:08.490><c> we</c>

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Oracle eyes is rightly different what we
 

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Oracle eyes is rightly different what we
are<00:01:08.700><c> built</c><00:01:08.909><c> here</c><00:01:09.240><c> is</c><00:01:09.770><c> a</c><00:01:10.770><c> contract</c><00:01:11.189><c> interface</c>

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are built here is a contract interface
 

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are built here is a contract interface
so<00:01:12.299><c> that</c><00:01:12.330><c> you</c><00:01:12.750><c> can</c><00:01:12.930><c> use</c><00:01:13.140><c> from</c><00:01:13.409><c> your</c><00:01:13.470><c> own</c>

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so that you can use from your own
 

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so that you can use from your own
contract<00:01:14.460><c> our</c><00:01:15.420><c> service</c><00:01:16.049><c> to</c><00:01:16.350><c> fetch</c><00:01:16.590><c> API</c><00:01:16.920><c> is</c><00:01:17.340><c> and</c>

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contract our service to fetch API is and
 

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contract our service to fetch API is and
data<00:01:18.030><c> feeds</c><00:01:18.330><c> from</c><00:01:18.509><c> the</c><00:01:18.600><c> internet</c><00:01:19.080><c> so</c><00:01:20.009><c> since</c><00:01:20.700><c> we</c>

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data feeds from the internet so since we
 

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data feeds from the internet so since we
are<00:01:21.119><c> a</c><00:01:21.270><c> centralized</c><00:01:21.720><c> party</c><00:01:22.140><c> because</c><00:01:22.860><c> the</c>

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are a centralized party because the
 

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are a centralized party because the
fetching<00:01:23.220><c> cannot</c><00:01:23.729><c> be</c><00:01:23.909><c> done</c><00:01:24.090><c> on</c><00:01:24.330><c> chain</c><00:01:24.600><c> and</c>

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fetching cannot be done on chain and
 

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fetching cannot be done on chain and
directly<00:01:25.950><c> with</c><00:01:26.189><c> some</c><00:01:26.400><c> of</c><00:01:26.759><c> course</c><00:01:26.939><c> all</c><00:01:27.180><c> things</c>

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directly with some of course all things
 

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directly with some of course all things
are<00:01:27.479><c> dead</c><00:01:27.829><c> how</c><00:01:28.829><c> can</c><00:01:28.890><c> you</c><00:01:29.579><c> trust</c><00:01:29.909><c> us</c><00:01:30.180><c> we</c><00:01:31.140><c> are</c>

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are dead how can you trust us we are
 

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are dead how can you trust us we are
sending<00:01:31.640><c> TLS</c><00:01:32.640><c> natori</c><00:01:33.060><c> proof</c><00:01:33.320><c> which</c><00:01:34.320><c> is</c>

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sending TLS natori proof which is
 

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sending TLS natori proof which is
proving<00:01:34.890><c> that</c><00:01:35.100><c> a</c><00:01:35.340><c> center</c><00:01:35.670><c> a</c><00:01:35.909><c> certain</c><00:01:36.270><c> content</c>

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proving that a center a certain content
 

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proving that a center a certain content
was<00:01:38.270><c> given</c><00:01:39.270><c> as</c><00:01:39.420><c> a</c><00:01:39.450><c> result</c><00:01:39.840><c> by</c><00:01:40.079><c> a</c><00:01:40.110><c> certain</c>

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was given as a result by a certain
 

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was given as a result by a certain
server<00:01:41.040><c> at</c><00:01:41.430><c> a</c><00:01:41.490><c> specified</c><00:01:41.820><c> time</c><00:01:42.140><c> so</c><00:01:43.189><c> in</c><00:01:44.189><c> this</c>

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server at a specified time so in this
 

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server at a specified time so in this
way<00:01:44.549><c> you</c><00:01:44.759><c> don't</c><00:01:45.090><c> have</c><00:01:45.180><c> to</c><00:01:45.509><c> trust</c><00:01:45.750><c> us</c><00:01:46.549><c> not</c><00:01:47.549><c> to</c>

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way you don't have to trust us not to
 

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way you don't have to trust us not to
alter<00:01:47.970><c> your</c><00:01:48.000><c> data</c><00:01:48.390><c> and</c><00:01:48.750><c> you</c><00:01:49.140><c> are</c><00:01:49.229><c> 100%</c><00:01:49.680><c> sure</c>

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alter your data and you are 100% sure
 

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alter your data and you are 100% sure
that<00:01:50.430><c> the</c><00:01:50.729><c> data</c><00:01:50.909><c> coming</c><00:01:51.210><c> from</c><00:01:51.299><c> us</c><00:01:51.600><c> is</c><00:01:52.259><c> not</c>

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that the data coming from us is not
 

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that the data coming from us is not
altered<00:01:52.970><c> so</c><00:01:53.970><c> to</c><00:01:54.630><c> explain</c><00:01:55.229><c> with</c><00:01:55.380><c> some</c><00:01:55.590><c> code</c>

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altered so to explain with some code
 

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altered so to explain with some code
with<00:01:56.130><c> what</c><00:01:56.880><c> they</c><00:01:56.969><c> just</c><00:01:57.119><c> said</c><00:02:01.460><c> oops</c>

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with what they just said oops
 

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with what they just said oops
I<00:02:04.960><c> just</c><00:02:05.960><c> show</c><00:02:06.170><c> that</c><00:02:06.200><c> acne</c><00:02:06.560><c> on</c><00:02:06.650><c> the</c><00:02:06.740><c> website</c><00:02:09.550><c> so</c>

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I just show that acne on the website so
 

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I just show that acne on the website so
if<00:02:10.850><c> you</c><00:02:11.060><c> go</c><00:02:11.240><c> through</c><00:02:11.570><c> this</c><00:02:12.520><c> subdomain</c><00:02:13.520><c> def</c><00:02:14.240><c> dot</c>

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if you go through this subdomain def dot
 

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if you go through this subdomain def dot
or<00:02:14.750><c> alkalis</c><00:02:15.050><c> dot</c><00:02:15.230><c> a</c><00:02:15.320><c> here</c><00:02:15.590><c> there</c><00:02:16.160><c> are</c><00:02:16.310><c> some</c>

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or alkalis dot a here there are some
 

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or alkalis dot a here there are some
sample<00:02:16.910><c> codes</c><00:02:17.120><c> that</c><00:02:17.930><c> awfully</c><00:02:18.500><c> now</c><00:02:18.620><c> will</c><00:02:18.800><c> be</c>

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sample codes that awfully now will be
 

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sample codes that awfully now will be
loading<00:02:20.170><c> and</c><00:02:21.520><c> calling</c><00:02:22.520><c> your</c><00:02:22.610><c> class</c><00:02:22.880><c> is</c><00:02:23.030><c> very</c>

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loading and calling your class is very
 

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loading and calling your class is very
easy<00:02:23.390><c> because</c><00:02:23.630><c> essentially</c><00:02:24.200><c> we</c><00:02:24.410><c> are</c>

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easy because essentially we are
 

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easy because essentially we are
providing<00:02:24.950><c> a</c><00:02:25.640><c> solidity</c><00:02:26.360><c> file</c><00:02:27.140><c> to</c><00:02:27.940><c> to</c><00:02:28.940><c> import</c>

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providing a solidity file to to import
 

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providing a solidity file to to import
directly<00:02:29.390><c> in</c><00:02:29.720><c> your</c><00:02:29.750><c> code</c><00:02:30.050><c> and</c><00:02:30.230><c> after</c><00:02:30.980><c> that</c><00:02:31.340><c> you</c>

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directly in your code and after that you
 

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directly in your code and after that you
have<00:02:31.940><c> a</c><00:02:32.480><c> base</c><00:02:32.930><c> contract</c><00:02:33.470><c> which</c><00:02:33.740><c> is</c><00:02:33.770><c> called</c>

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have a base contract which is called
 

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have a base contract which is called
using<00:02:34.670><c> oracle</c><00:02:35.030><c> eyes</c><00:02:35.150><c> so</c><00:02:35.690><c> essentially</c><00:02:36.080><c> you</c><00:02:36.380><c> can</c>

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using oracle eyes so essentially you can
 

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using oracle eyes so essentially you can
write<00:02:36.800><c> your</c><00:02:37.040><c> code</c><00:02:38.260><c> we</c><00:02:39.260><c> and</c><00:02:39.860><c> in</c><00:02:40.100><c> the</c><00:02:40.220><c> definition</c>

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write your code we and in the definition
 

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write your code we and in the definition
you<00:02:41.060><c> can</c><00:02:41.270><c> extend</c><00:02:41.690><c> you</c><00:02:41.900><c> can</c><00:02:42.020><c> inherit</c><00:02:42.290><c> our</c>

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you can extend you can inherit our
 

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you can extend you can inherit our
contract<00:02:43.400><c> by</c><00:02:43.580><c> just</c><00:02:43.790><c> typing</c><00:02:44.000><c> is</c><00:02:44.420><c> using</c><00:02:45.050><c> oracle</c>

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contract by just typing is using oracle
 

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contract by just typing is using oracle
eyes<00:02:45.560><c> so</c><00:02:46.220><c> this</c><00:02:46.459><c> is</c><00:02:46.690><c> providing</c><00:02:47.690><c> some</c><00:02:48.320><c> functions</c>

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eyes so this is providing some functions
 

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eyes so this is providing some functions
such<00:02:49.430><c> as</c><00:02:49.459><c> oracle</c><00:02:50.360><c> eyes</c><00:02:51.130><c> underscore</c><00:02:52.130><c> query</c><00:02:53.260><c> the</c>

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such as oracle eyes underscore query the
 

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such as oracle eyes underscore query the
code<00:02:54.410><c> is</c><00:02:54.530><c> not</c><00:02:54.709><c> loading</c><00:02:55.040><c> so</c><00:02:55.310><c> this</c><00:02:55.459><c> is</c><00:02:55.610><c> a</c><00:02:55.640><c> little</c>

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code is not loading so this is a little
 

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code is not loading so this is a little
bit<00:02:56.180><c> difficult</c><00:02:56.450><c> to</c><00:02:56.690><c> explain</c><00:02:57.400><c> let's</c><00:02:58.400><c> see</c><00:03:00.550><c> if</c><00:03:01.550><c> at</c>

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bit difficult to explain let's see if at
 

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bit difficult to explain let's see if at
least<00:03:01.940><c> a</c><00:03:02.030><c> documentation</c><00:03:02.540><c> is</c><00:03:02.959><c> working</c><00:03:03.470><c> yeah</c><00:03:08.500><c> so</c>

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least a documentation is working yeah so
 

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least a documentation is working yeah so
essentially<00:03:10.040><c> you</c><00:03:10.430><c> are</c><00:03:10.459><c> sending</c><00:03:11.060><c> us</c><00:03:11.239><c> an</c>

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essentially you are sending us an
 

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essentially you are sending us an
asynchronous<00:03:13.540><c> request</c><00:03:14.540><c> and</c><00:03:16.600><c> this</c><00:03:17.600><c> is</c><00:03:17.780><c> the</c>

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asynchronous request and this is the
 

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asynchronous request and this is the
syntax<00:03:18.320><c> so</c><00:03:18.500><c> you</c><00:03:18.560><c> just</c><00:03:18.980><c> type</c><00:03:19.160><c> oracle</c><00:03:19.760><c> eyes</c>

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syntax so you just type oracle eyes
 

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syntax so you just type oracle eyes
underscore<00:03:20.450><c> it</c><00:03:20.810><c> and</c><00:03:20.989><c> as</c><00:03:21.350><c> first</c><00:03:21.650><c> argument</c><00:03:22.070><c> you</c>

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underscore it and as first argument you
 

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underscore it and as first argument you
specify<00:03:23.180><c> the</c><00:03:23.239><c> data</c><00:03:23.510><c> source</c><00:03:23.810><c> the</c><00:03:24.049><c> data</c><00:03:24.260><c> source</c>

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specify the data source the data source
 

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specify the data source the data source
in<00:03:24.829><c> this</c><00:03:24.980><c> case</c><00:03:25.190><c> is</c><00:03:25.459><c> Wolfram</c><00:03:26.180><c> Alpha</c><00:03:26.329><c> but</c>

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in this case is Wolfram Alpha but
 

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in this case is Wolfram Alpha but
obviously<00:03:27.560><c> you</c><00:03:27.769><c> can</c><00:03:28.010><c> get</c><00:03:28.160><c> even</c><00:03:28.579><c> you</c><00:03:29.480><c> can</c><00:03:29.660><c> use</c>

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obviously you can get even you can use
 

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obviously you can get even you can use
directly<00:03:30.950><c> any</c><00:03:31.900><c> HTTP</c><00:03:32.900><c> API</c><00:03:33.650><c> you</c><00:03:33.829><c> want</c><00:03:34.070><c> just</c><00:03:34.489><c> by</c>

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directly any HTTP API you want just by
 

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directly any HTTP API you want just by
typing<00:03:35.239><c> as</c><00:03:35.420><c> data</c><00:03:35.660><c> source</c><00:03:35.930><c> URL</c><00:03:36.140><c> so</c><00:03:36.980><c> this</c><00:03:37.130><c> is</c><00:03:37.280><c> a</c>

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typing as data source URL so this is a
 

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typing as data source URL so this is a
synchronous<00:03:37.850><c> and</c><00:03:38.060><c> then</c><00:03:38.480><c> I'm</c><00:03:38.720><c> say</c><00:03:39.049><c> we</c><00:03:39.320><c> are</c>

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synchronous and then I'm say we are
 

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synchronous and then I'm say we are
sending<00:03:39.650><c> back</c><00:03:39.799><c> a</c><00:03:40.670><c> transaction</c><00:03:41.570><c> which</c><00:03:41.750><c> is</c>

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sending back a transaction which is
 

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sending back a transaction which is
calling<00:03:42.350><c> a</c><00:03:42.560><c> callback</c><00:03:42.799><c> method</c><00:03:43.400><c> in</c><00:03:43.549><c> your</c>

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calling a callback method in your
 

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calling a callback method in your
contract<00:03:44.150><c> so</c><00:03:44.630><c> the</c><00:03:44.810><c> only</c><00:03:44.930><c> thing</c><00:03:45.140><c> you</c><00:03:45.230><c> have</c><00:03:45.350><c> to</c>

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contract so the only thing you have to
 

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contract so the only thing you have to
do<00:03:45.620><c> is</c><00:03:45.950><c> to</c><00:03:46.280><c> implement</c><00:03:46.730><c> a</c><00:03:46.910><c> callback</c><00:03:47.239><c> method</c>

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do is to implement a callback method
 

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do is to implement a callback method
which<00:03:49.370><c> is</c><00:03:49.549><c> described</c><00:03:49.910><c> in</c><00:03:50.030><c> the</c><00:03:50.090><c> documentation</c>

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which is described in the documentation
 

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which is described in the documentation
here<00:03:50.930><c> callback</c><00:03:51.500><c> function</c><00:03:51.950><c> and</c><00:03:52.190><c> then</c><00:03:52.700><c> here</c><00:03:53.060><c> you</c>

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here callback function and then here you
 

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here callback function and then here you
decide<00:03:53.630><c> what</c><00:03:53.840><c> to</c><00:03:53.959><c> do</c><00:03:54.110><c> with</c><00:03:54.140><c> this</c><00:03:54.530><c> data</c>

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decide what to do with this data
 

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decide what to do with this data
so<00:03:55.700><c> essentially</c><00:03:56.150><c> you</c><00:03:56.450><c> can</c><00:03:56.630><c> write</c><00:03:57.370><c> in</c><00:03:58.370><c> just</c><00:03:58.730><c> ten</c>

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so essentially you can write in just ten
 

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so essentially you can write in just ten
lines<00:03:59.180><c> or</c><00:03:59.510><c> something</c><00:03:59.870><c> like</c><00:04:00.730><c> a</c><00:04:01.730><c> data</c><00:04:02.420><c> feed</c>

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lines or something like a data feed
 

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lines or something like a data feed
which<00:04:03.170><c> is</c><00:04:03.320><c> always</c><00:04:03.590><c> keeping</c><00:04:04.220><c> updated</c><00:04:04.489><c> the</c>

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which is always keeping updated the
 

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which is always keeping updated the
price<00:04:05.269><c> of</c><00:04:05.570><c> either</c><00:04:06.430><c> taking</c><00:04:07.430><c> the</c><00:04:07.730><c> price</c><00:04:07.940><c> from</c>

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price of either taking the price from
 

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price of either taking the price from
tracking<00:04:09.260><c> or</c><00:04:09.590><c> things</c><00:04:09.920><c> like</c><00:04:09.980><c> that</c><00:04:11.530><c> there</c><00:04:12.530><c> are</c>

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tracking or things like that there are
 

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tracking or things like that there are
even<00:04:13.430><c> some</c><00:04:13.669><c> utilities</c><00:04:14.570><c> you</c><00:04:14.750><c> can</c><00:04:14.930><c> use</c><00:04:15.109><c> because</c>

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even some utilities you can use because
 

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even some utilities you can use because
obviously

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obviously
 

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obviously
we<00:04:16.190><c> are</c><00:04:16.250><c> sending</c><00:04:16.430><c> back</c><00:04:16.580><c> this</c><00:04:17.450><c> as</c><00:04:18.020><c> string</c><00:04:18.440><c> so</c><00:04:19.310><c> we</c>

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we are sending back this as string so we
 

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we are sending back this as string so we
have<00:04:20.150><c> some</c><00:04:20.450><c> JSON</c><00:04:21.110><c> and</c><00:04:21.380><c> XML</c><00:04:21.850><c> helpers</c><00:04:22.850><c> so</c><00:04:23.570><c> you</c>

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have some JSON and XML helpers so you
 

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have some JSON and XML helpers so you
can<00:04:23.840><c> just</c><00:04:24.110><c> fetch</c><00:04:24.530><c> some</c><00:04:24.890><c> fields</c><00:04:25.670><c> if</c><00:04:25.820><c> you</c><00:04:26.090><c> don't</c>

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can just fetch some fields if you don't
 

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can just fetch some fields if you don't
need<00:04:26.390><c> the</c><00:04:26.990><c> old</c><00:04:27.170><c> response</c><00:04:27.530><c> back</c><00:04:28.070><c> from</c><00:04:28.100><c> the</c><00:04:28.280><c> API</c>

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need the old response back from the API
 

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need the old response back from the API
and<00:04:28.880><c> there</c><00:04:29.420><c> are</c><00:04:29.540><c> some</c><00:04:29.720><c> Alpers</c><00:04:30.140><c> so</c><00:04:30.860><c> that</c><00:04:31.040><c> you</c>

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and there are some Alpers so that you
 

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and there are some Alpers so that you
can<00:04:32.120><c> do</c><00:04:32.510><c> string</c><00:04:32.960><c> comparison</c><00:04:33.560><c> string</c>

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can do string comparison string
 

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can do string comparison string
concatenation<00:04:34.280><c> and</c><00:04:34.550><c> all</c><00:04:34.730><c> this</c><00:04:34.850><c> kind</c><00:04:35.090><c> of</c><00:04:35.150><c> stuff</c>

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concatenation and all this kind of stuff
 

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concatenation and all this kind of stuff
thank<00:04:36.320><c> you</c><00:04:36.470><c> for</c><00:04:36.620><c> your</c><00:04:36.710><c> attention</c>