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Add enum oracle example (#2601)
* Add enum oracle example * Fix sidebar * Address code review * One last comment
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Chris Stewart
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docs/oracle/oracle-election-example.md
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docs/oracle/oracle-election-example.md
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---
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id: oracle-election-example
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title: Election Example
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---
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## Requirements for example
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You need to have a fully built oracle server. You can follow [this guide](build-oracle-server.md) to do this.
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You will also need a the `bitcoin-s-cli` command line tool to interact with the server.
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You can find how to build this [here](../applications/cli.md)
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After building the oracle server, you will need to start it with
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```
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./app/oracle-server/target/universal/stage/bin/bitcoin-s-oracle-server
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```
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## US 2020 Election
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In 2020, the United States held a presidential election.
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People want to do a DLC based on the outcome, so you decide to be
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their oracle and attest to the winner of the election.
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1. Setting up an oracle that can attest to the outcome of the election
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2. Complete the event by attesting to the winner of the election
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### Setting up the election bet
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The election bet can be represented by an enumerated event. What we mean by this is the outcomes
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for this event can be simply enumerated in a list. There were three possible outcomes for the election
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1. "Republican_win"
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2. "Democrat_win"
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3. "other"
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The next step is to create an oracle announcement that can be shared with others. This announcement
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contains cryptographic information that is used by people that want to enter into DLCs to setup
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their bitcoin transactions.
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To do this, we need to use the `createenumevent` rpc. This RPC takes 3 parameters
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1. The label for the event
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we will use `2020-us-election`
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2. the maturation time for the event in seconds since the epoch.
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For our example we will use `1612224000` (Tuesday, February 2, 2021 12:00:00 AM).
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You will need to adjust this for your local testing. You can use [this](https://www.epochconverter.com/seconds-days-since-y0) tool to calculate one
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3. The outcomes, which we listed above "Republican_win,Democrat_win,other"
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With all of this information, we can create the event with `bitcoin-s-cli`!
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```
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./bitcoin-s-cli createenumevent 2020-us-election 1612224000 "Republican_win,Democrat_win,other"
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fdd824c3988fabec9820690f366271c9ceac00fbec1412075f9b319bb0db1f86460519dd9c61478949f2c00c35aeb8e53a1507616072cb802891e2c189a9fa65a0493de5d3b04a6d7b90c9c43c09ebe5250d583e1c3fc423219b26f6a02ec394a130000afdd8225f0001ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1460189600fdd8062400030e52657075626c6963616e5f77696e0c44656d6f637261745f77696e056f7468657210323032302d75732d656c656374696f6e
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```
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Yay! The hex string returned is an oracle announcement.
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You can submit this on a tool like the [suredbits oracle explorer](https://oracle.suredbits.com)
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so others can find your oracle.
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If you are building infrastructure to automatically sign events, it is important to store two things
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1. The oracle announcement above (`fdd824c...`)
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2. The timestamp that the event matures at (`1612224000`)
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Now you can schedule jobs to sign the event when the maturation time passes.
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### Signing the outcome for the election bet
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In the real world, you would want to wait for the maturation time to pass for your event.
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For the purposes of the demo, we can skip this wait. The winner of the US election was Joe Biden.
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Let's sign the event.
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```
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./bitcoin-s-cli signevent fdd824c3988fabec9820690f366271c9ceac00fbec1412075f9b319bb0db1f86460519dd9c61478949f2c00c35aeb8e53a1507616072cb802891e2c189a9fa65a0493de5d3b04a6d7b90c9c43c09ebe5250d583e1c3fc423219b26f6a02ec394a130000afdd8225f0001ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1460189600fdd8062400030e52657075626c6963616e5f77696e0c44656d6f637261745f77696e056f7468657210323032302d75732d656c656374696f6e Democrat_win
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fdd8688010323032302d75732d656c656374696f6ed3b04a6d7b90c9c43c09ebe5250d583e1c3fc423219b26f6a02ec394a130000a0001ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1447a59ba58797e55b967aa79c89ffec67023578009c4dc1e3dee2fd75277993590c44656d6f637261745f77696e
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```
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Yay! Now bitcoin-s gives us an attestation that is represented by the hex string `fdd868...`
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If you submitted your event to the [suredbits oracle explorer](https://oracle.suredbits.com) above
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you will also want to submit the attestation for your event so others can find it and settle their DLCs.
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If you use the `getevent` rpc along the oracle announcement, you can see the event is now completed!
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```
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./bitcoin-s-cli getevent fdd824c3988fabec9820690f366271c9ceac00fbec1412075f9b319bb0db1f86460519dd9c61478949f2c00c35aeb8e53a1507616072cb802891e2c189a9fa65a0493de5d3b04a6d7b90c9c43c09ebe5250d583e1c3fc423219b26f6a02ec394a130000afdd8225f0001ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1460189600fdd8062400030e52657075626c6963616e5f77696e0c44656d6f637261745f77696e056f7468657210323032302d75732d656c656374696f6e
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{
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"nonces": [
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"ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee14"
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],
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"eventName": "2020-us-election",
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"signingVersion": "DLCOracleV0SigningVersion",
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"maturationTime": "2021-02-02T00:00:00Z",
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"announcementSignature": "988fabec9820690f366271c9ceac00fbec1412075f9b319bb0db1f86460519dd9c61478949f2c00c35aeb8e53a1507616072cb802891e2c189a9fa65a0493de5",
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"eventDescriptorTLV": "fdd8062400030e52657075626c6963616e5f77696e0c44656d6f637261745f77696e056f74686572",
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"eventTLV": "fdd8225f0001ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1460189600fdd8062400030e52657075626c6963616e5f77696e0c44656d6f637261745f77696e056f7468657210323032302d75732d656c656374696f6e",
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"announcementTLV": "fdd824c3988fabec9820690f366271c9ceac00fbec1412075f9b319bb0db1f86460519dd9c61478949f2c00c35aeb8e53a1507616072cb802891e2c189a9fa65a0493de5d3b04a6d7b90c9c43c09ebe5250d583e1c3fc423219b26f6a02ec394a130000afdd8225f0001ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1460189600fdd8062400030e52657075626c6963616e5f77696e0c44656d6f637261745f77696e056f7468657210323032302d75732d656c656374696f6e",
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"attestations": [
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"47a59ba58797e55b967aa79c89ffec67023578009c4dc1e3dee2fd7527799359"
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],
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"signatures": [
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"ae3e30df5a203ad10ee89a909df0c8ccea4836e94e0a5d34c3cdab758fcaee1447a59ba58797e55b967aa79c89ffec67023578009c4dc1e3dee2fd7527799359"
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],
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"outcomes": [
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"Republican_win",
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"Democrat_win",
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"other"
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]
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}
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```
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],
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"DLC Oracle": [
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"oracle/build-oracle-server",
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"oracle/oracle-server"
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"oracle/oracle-server",
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"oracle/oracle-election-example"
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],
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"Contributing": [
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"contributing",
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