Decentralized event ticket management

Decentralized ticket management intro.pdf presenting the idea.

There is a big focus on Wallet implementations, but what if we would extend it to Digital Identity which might drive mass adoption of de-centralization. We suggest that community starts using blockchain in their life e.g. event organization (bit bot limited to),

This project was prepared during EthBerlinZwei Hackathon 2019.

• Actors of the dApp
• Workflows
  • Event Participant
  • Event Organizer
  • Participation validators (aka Volunteers)
• Implementation
  • Setting up simulation
    • Creating DID of Event Organizer
    • Creating DID of Participant 1
    • Creating DID of Participant 2
    • Digital identity addresses
  • Participation in the event
    • Participant 1 sign up
      • Participant 2 sign up
    • Event organizer gets the list of registered participants
      • Event organizer creates ticket for participant 1 (Dima)
    • Participant 1 (Dima) reads the ticket
      • Volunteer validates the ticket of participant 1 (Dima)
• TODO

Actors of the dApp

• Event Participant. Person who is willing to participate in the event (hackathon or conference).
  • Manages his digital identity wallet where event related information will be stored.
  • Signs up for the event.
• Event Organizer.
  • Manages digital identity of the event.
  • Manages event participants.
• Event Volunteers, Security-check/Canteen worker etc.
  • Scan participants' QR code upon request to validate the ticket

Important All data being stored off-chain in IPFS and encrypted according Monetha Platform private data exchange protocol

Workflows

Event Participant

1. Each Event Participant during (or before) signup creates a digital identity which is later to be used to store a ticket for the event.
2. Upon submition of data of participation a ticket information is being stored into the digital identity of Event Organizer

Event Organizer

1. Monitors a list of newly registered Event Participant and issues tickets for those who performed a payment.
2. During ticket issuing information is stored to the digital identity of the Event Participant. Stored data contains a signed participant's information (provided during signup) + address of event organizer's digital identity.

Participation validators (aka Volunteers)

1. Participant shows his ticket as QR code. A QR code contains a signature of Event Organizer and signed ticket information which is Organizer's DID address and Participant's DID address.
2. Ticket scanner validates the signature and verifies that it was submited by the Event Organizer for a specified Participant's DID address.

Implementation

We do understand the necessity of the good UI/UX. However all we did come up during Hackathon is the command line utility that resembles the workflows that would be a part of the dApp.

Command-line utility is using Ropsten testnet and scanner.monetha.io can be used in order to explore digital identities and facts that are written there (aka data points).

As any systems there are some prerequisites for further simulation of behavior. For simplicity we've created 3 digital identities (aka DIDs): Event Organizer, Participant 1, Participant 2.

Setting up simulation

Creating DID of Event Organizer

In order to create DID you need to use deploy-passport tool which is a part of Monetha's Platform (Go SDK). Follow README instructions to build the tool.

After that, you can use the tool to create a digital identity. Note: private keys of digital identity owner should be stored in file in plain-hex format.

$ ./deploy-passport \
  -ownerkey ./event-organizer.key \
  -factoryaddr 0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2 \
  -backendurl https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041

WARN [08-24|20:33:16.360] Loaded configuration                     owner_address=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB backend_url=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 factory=0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2
WARN [08-24|20:33:17.162] Getting balance                          address=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB
WARN [08-24|20:33:17.304] Initializing PassportFactory contract    factory=0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2
WARN [08-24|20:33:17.305] Deploying Passport contract              owner_address=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB
WARN [08-24|20:33:17.927] Waiting for transaction                  hash=0xbbda36637e92b559d6fa45a025f3c81bbfe18dc6dc19fab96d9795d90d3455e0
WARN [08-24|20:33:34.550] Transaction successfully mined           tx_hash=0xbbda36637e92b559d6fa45a025f3c81bbfe18dc6dc19fab96d9795d90d3455e0 gas_used=445061
WARN [08-24|20:33:34.550] New passport deployed                    gas_used=445061
WARN [08-24|20:33:34.555] Passport deployed                        contract_address=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52
WARN [08-24|20:33:34.555] Initializing Passport contract           passport=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52
WARN [08-24|20:33:34.555] Claiming ownership                       owner_address=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB
WARN [08-24|20:33:35.101] Waiting for transaction                  hash=0x469c63e5d29fc1a13d8a771fac62a6255131a18b45510654ecaa82a9a8dbb475
WARN [08-24|20:33:43.364] Transaction successfully mined           tx_hash=0x469c63e5d29fc1a13d8a771fac62a6255131a18b45510654ecaa82a9a8dbb475 gas_used=19397
WARN [08-24|20:33:43.364] Ownership claimed successfully           gas_used=19397
WARN [08-24|20:33:43.364] Done.

Creating DID of Participant 1

$ ./deploy-passport \
  -ownerkey ./event-participant1.key \
  -factoryaddr 0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2 \
  -backendurl https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041

WARN [08-24|20:37:24.013] Loaded configuration                     owner_address=0x1faF3952f34A936E042D33d58A9BBF0930886D2C backend_url=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 factory=0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2
WARN [08-24|20:37:25.746] Getting balance                          address=0x1faF3952f34A936E042D33d58A9BBF0930886D2C
WARN [08-24|20:37:25.881] Initializing PassportFactory contract    factory=0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2
WARN [08-24|20:37:25.882] Deploying Passport contract              owner_address=0x1faF3952f34A936E042D33d58A9BBF0930886D2C
WARN [08-24|20:37:26.409] Waiting for transaction                  hash=0x8a188bae73e3ee9ac53e875d8880573f4d50a3cfc769d93ed673dc4f4a78f1d0
WARN [08-24|20:38:21.733] Transaction successfully mined           tx_hash=0x8a188bae73e3ee9ac53e875d8880573f4d50a3cfc769d93ed673dc4f4a78f1d0 gas_used=445061
WARN [08-24|20:38:21.733] New passport deployed                    gas_used=445061
WARN [08-24|20:38:21.747] Passport deployed                        contract_address=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70
WARN [08-24|20:38:21.747] Initializing Passport contract           passport=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70
WARN [08-24|20:38:21.748] Claiming ownership                       owner_address=0x1faF3952f34A936E042D33d58A9BBF0930886D2C
WARN [08-24|20:38:22.301] Waiting for transaction                  hash=0xe268c5ade69406a3f7e75387fbd8fd969ef8708fa2374eb0cef47aaad315cd82
WARN [08-24|20:39:28.777] Transaction successfully mined           tx_hash=0xe268c5ade69406a3f7e75387fbd8fd969ef8708fa2374eb0cef47aaad315cd82 gas_used=19397
WARN [08-24|20:39:28.777] Ownership claimed successfully           gas_used=19397
WARN [08-24|20:39:28.778] Done.

Creating DID of Participant 2

$ ./deploy-passport \
  -ownerkey ./event-participant2.key \
  -factoryaddr 0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2 \
  -backendurl https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041

WARN [08-24|20:41:36.259] Loaded configuration                     owner_address=0x88BDb5deeaA40E7c980b1f52ecD2113bBF424b5C backend_url=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 factory=0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2
WARN [08-24|20:41:38.200] Getting balance                          address=0x88BDb5deeaA40E7c980b1f52ecD2113bBF424b5C
WARN [08-24|20:41:38.353] Initializing PassportFactory contract    factory=0x35Cb95Db8E6d56D1CF8D5877EB13e9EE74e457F2
WARN [08-24|20:41:38.355] Deploying Passport contract              owner_address=0x88BDb5deeaA40E7c980b1f52ecD2113bBF424b5C
WARN [08-24|20:41:39.067] Waiting for transaction                  hash=0x7ca14782021390e7a03653c8461fa07e985e2d7a6b74b0df3385a236985ebc0a
WARN [08-24|20:42:30.674] Transaction successfully mined           tx_hash=0x7ca14782021390e7a03653c8461fa07e985e2d7a6b74b0df3385a236985ebc0a gas_used=445061
WARN [08-24|20:42:30.674] New passport deployed                    gas_used=445061
WARN [08-24|20:42:30.680] Passport deployed                        contract_address=0xf39c56A379f6aD182b359C0296ddf3ac30A3C871
WARN [08-24|20:42:30.680] Initializing Passport contract           passport=0xf39c56A379f6aD182b359C0296ddf3ac30A3C871
WARN [08-24|20:42:30.681] Claiming ownership                       owner_address=0x88BDb5deeaA40E7c980b1f52ecD2113bBF424b5C
WARN [08-24|20:42:31.214] Waiting for transaction                  hash=0x9756b2a2a2ebef405999e5c4f2daaf4844b4b15512493d964e1e60127d02e30b
WARN [08-24|20:42:43.850] Transaction successfully mined           tx_hash=0x9756b2a2a2ebef405999e5c4f2daaf4844b4b15512493d964e1e60127d02e30b gas_used=19397
WARN [08-24|20:42:43.850] Ownership claimed successfully           gas_used=19397
WARN [08-24|20:42:43.850] Done.

Digital identity addresses

• Event organizer DID address: 0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52
• Participant 1 DID address: 0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70
• Participant 2 DID address: 0xf39c56A379f6aD182b359C0296ddf3ac30A3C871

Participation in the event

Decentralized ticket management tool is implemented as a single-binary tool called tm.

To build it just run commands (make sure you have Go 1.12 installed):

make dependencies
make

After the executable file is built, it can be found in the directory ./bin/.

Participant 1 sign up

$ ./bin/tm signup \
  --eventaddr=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 \
  --participantaddr=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70 \
  --participantname=Dima \
  --privatekey=./event-participant1.key \
  --backendurl=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 \
  --ipfsurl=http://127.0.0.1:5001/

Output

INFO [08-24|21:15:40.453] Filtering OwnershipTransferred           newOwner=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB
INFO [08-24|21:15:40.616] Getting transaction by hash              tx_hash=0x469c63e5d29fc1a13d8a771fac62a6255131a18b45510654ecaa82a9a8dbb475
INFO [08-24|21:15:40.740] Writing ephemeral public key to IPFS...
INFO [08-24|21:15:40.754] Ephemeral public key added to IPFS       hash=QmSi62mJQ4MWdAgHq1m6TBBJSPqfAQTLt2NkiHP4H3NUNL size=73
INFO [08-24|21:15:40.754] Writing encrypted message to IPFS...
INFO [08-24|21:15:40.758] Encrypted message added to IPFS          hash=QmeABowQ8hiEkZLvPVCSwwFozyV7J7gp4ciAHgaTrD9isa size=127
INFO [08-24|21:15:40.758] Writing message HMAC to IPFS...
INFO [08-24|21:15:40.762] Message HMAC added to IPFS               hash=QmaBBmXNC23sVwyb2N3sc2EYNCJ5TdXYjoHWsZh52na66p size=40
INFO [08-24|21:15:40.762] Creating directory in IPFS...
INFO [08-24|21:15:40.770] Directory created in IPFS                hash=QmbyZgioijHBTJX88ChbGRkHUPMhf11fMZ3CBXEkJYRz37
INFO [08-24|21:15:40.770] Writing private data hashes to Ethereum  passport=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 fact_key="[115 105 103 110 117 112 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]" ipfs_hash=QmbyZgioijHBTJX88ChbGRkHUPMhf11fMZ3CBXEkJYRz37 data_key_hash=0x9e16a2bc26c410a38d49b39830703e96c7f91b325d96f32c982e4b5034dfa089
INFO [08-24|21:15:40.897] Writing IPFS private data hashes to passport fact_provider=0x1faF3952f34A936E042D33d58A9BBF0930886D2C key="[115 105 103 110 117 112 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]"
INFO [08-24|21:15:41.881] Waiting for transaction                  hash=0x62b6433f5816f48237fc39cdbf07b42728b97be713cf8ca4353f5c5ac7e26912
INFO [08-24|21:15:50.172] Transaction successfully mined           tx_hash=0x62b6433f5816f48237fc39cdbf07b42728b97be713cf8ca4353f5c5ac7e26912 gas_used=60519
INFO [08-24|21:15:50.172] Signup info                              tx_hash=0x62b6433f5816f48237fc39cdbf07b42728b97be713cf8ca4353f5c5ac7e26912 ipfs_hash=QmbyZgioijHBTJX88ChbGRkHUPMhf11fMZ3CBXEkJYRz37```

Participant 2 sign up

./bin/tm signup \
  --eventaddr=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 \
  --participantaddr=0xf39c56A379f6aD182b359C0296ddf3ac30A3C871 \
  --participantname=Slava \
  --privatekey=./event-participant2.key \
  --backendurl=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 \
  --ipfsurl=http://127.0.0.1:5001/

Output

INFO [08-24|21:18:13.029] Filtering OwnershipTransferred           newOwner=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB
INFO [08-24|21:18:13.168] Getting transaction by hash              tx_hash=0x469c63e5d29fc1a13d8a771fac62a6255131a18b45510654ecaa82a9a8dbb475
INFO [08-24|21:18:13.298] Writing ephemeral public key to IPFS...
INFO [08-24|21:18:13.309] Ephemeral public key added to IPFS       hash=QmTfpZByJwpBwPKtN9yKHkVHpTL9TwYeu9gV14aXTMNVFR size=73
INFO [08-24|21:18:13.309] Writing encrypted message to IPFS...
INFO [08-24|21:18:13.314] Encrypted message added to IPFS          hash=QmQjofP7CjNhFk3ovTaHBp8YtUtjsBUFAHykZqSgabGYaB size=128
INFO [08-24|21:18:13.314] Writing message HMAC to IPFS...
INFO [08-24|21:18:13.319] Message HMAC added to IPFS               hash=QmVuuBfWVQ11sy2nyRhmywSqvkc34v2V2PRroDCtFrKvNY size=40
INFO [08-24|21:18:13.319] Creating directory in IPFS...
INFO [08-24|21:18:13.322] Directory created in IPFS                hash=QmeF8fF5kYjvMXt7voa3SxSt14VRTMrtZ9KtEJKhk1aBkP
INFO [08-24|21:18:13.322] Writing private data hashes to Ethereum  passport=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 fact_key="[115 105 103 110 117 112 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]" ipfs_hash=QmeF8fF5kYjvMXt7voa3SxSt14VRTMrtZ9KtEJKhk1aBkP data_key_hash=0xcaf670898b6ff3045a8c868477cc4bf0996d13aae742f76e6fa4165750d799df
INFO [08-24|21:18:13.445] Writing IPFS private data hashes to passport fact_provider=0x88BDb5deeaA40E7c980b1f52ecD2113bBF424b5C key="[115 105 103 110 117 112 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]"
INFO [08-24|21:18:14.161] Waiting for transaction                  hash=0x409b9827096106ad8a0c2b6aad5616283a3465195a063e4825d5795b7c32110f
INFO [08-24|21:18:30.748] Transaction successfully mined           tx_hash=0x409b9827096106ad8a0c2b6aad5616283a3465195a063e4825d5795b7c32110f gas_used=135519
INFO [08-24|21:18:30.748] Signup info                              tx_hash=0x409b9827096106ad8a0c2b6aad5616283a3465195a063e4825d5795b7c32110f ipfs_hash=QmeF8fF5kYjvMXt7voa3SxSt14VRTMrtZ9KtEJKhk1aBkP

Event organizer gets the list of registered participants

./bin/tm signup-list --eventaddr=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 \
  --privatekey=./event-organizer.key \
  --backendurl=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 \
  --ipfsurl=http://127.0.0.1:5001/

INFO [08-24|21:19:08.781] Reading data hashes from Ethereum transaction passport=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 tx_hash=62b643…e26912
INFO [08-24|21:19:08.781] Getting transaction by hash              tx_hash=0x62b6433f5816f48237fc39cdbf07b42728b97be713cf8ca4353f5c5ac7e26912
INFO [08-24|21:19:08.919] Reading ephemeral public key from IPFS   hash=QmbyZgioijHBTJX88ChbGRkHUPMhf11fMZ3CBXEkJYRz37 filename=public_key
INFO [08-24|21:19:08.922] Reading encrypted message from IPFS      hash=QmbyZgioijHBTJX88ChbGRkHUPMhf11fMZ3CBXEkJYRz37 filename=encrypted_message
INFO [08-24|21:19:08.923] Reading message HMAC from IPFS           hash=QmbyZgioijHBTJX88ChbGRkHUPMhf11fMZ3CBXEkJYRz37 filename=hmac
INFO [08-24|21:19:08.924] Reading data hashes from Ethereum transaction passport=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 tx_hash=409b98…32110f
INFO [08-24|21:19:08.925] Getting transaction by hash              tx_hash=0x409b9827096106ad8a0c2b6aad5616283a3465195a063e4825d5795b7c32110f
INFO [08-24|21:19:09.050] Reading ephemeral public key from IPFS   hash=QmeF8fF5kYjvMXt7voa3SxSt14VRTMrtZ9KtEJKhk1aBkP filename=public_key
INFO [08-24|21:19:09.054] Reading encrypted message from IPFS      hash=QmeF8fF5kYjvMXt7voa3SxSt14VRTMrtZ9KtEJKhk1aBkP filename=encrypted_message
INFO [08-24|21:19:09.055] Reading message HMAC from IPFS           hash=QmeF8fF5kYjvMXt7voa3SxSt14VRTMrtZ9KtEJKhk1aBkP filename=hmac
+--------------------------------------------+-----------+
|              PARTICIPANT DID               | FULL NAME |
+--------------------------------------------+-----------+
| 0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70 | Dima      |
| 0xf39c56A379f6aD182b359C0296ddf3ac30A3C871 | Slava     |
+--------------------------------------------+-----------+

Event organizer creates ticket for participant 1 (Dima)

./bin/tm create-ticket --eventaddr=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 \
  --participantaddr=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70 \
  --privatekey=./event-organizer.key \
  --backendurl=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 \
  --ipfsurl=http://127.0.0.1:5001/

Output

INFO [08-24|21:21:13.302] Filtering OwnershipTransferred           newOwner=0x1faF3952f34A936E042D33d58A9BBF0930886D2C
INFO [08-24|21:21:13.431] Getting transaction by hash              tx_hash=0xe268c5ade69406a3f7e75387fbd8fd969ef8708fa2374eb0cef47aaad315cd82
INFO [08-24|21:21:13.553] Writing ephemeral public key to IPFS...
INFO [08-24|21:21:13.561] Ephemeral public key added to IPFS       hash=QmWdG7DftBUEm1FxmYuscKQ5WMWaDFZZacJYWiao63fPJk size=73
INFO [08-24|21:21:13.561] Writing encrypted message to IPFS...
INFO [08-24|21:21:13.566] Encrypted message added to IPFS          hash=QmW5xqpNqM4aJD9yLwxeDhPdXH1ebaFmxAov5LLCGyCL92 size=653
INFO [08-24|21:21:13.567] Writing message HMAC to IPFS...
INFO [08-24|21:21:13.573] Message HMAC added to IPFS               hash=QmP3QhACNH1gXecicYAQx7iydjaVZLYHMJyVZ33QoScCVz size=40
INFO [08-24|21:21:13.573] Creating directory in IPFS...
INFO [08-24|21:21:13.579] Directory created in IPFS                hash=QmentPHPSk9aj4Xb8m3oHdTDcQCVyq5bp7j9X9WZ5b8vqM
INFO [08-24|21:21:13.579] Writing private data hashes to Ethereum  passport=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70 fact_key="[237 248 226 187 72 113 242 255 118 211 170 139 157 195 37 45 160 108 74 82 0 0 0 0 0 0 0 0 0 0 0 0]" ipfs_hash=QmentPHPSk9aj4Xb8m3oHdTDcQCVyq5bp7j9X9WZ5b8vqM data_key_hash=0x014406cd45ae83fa817e763b9f6c1ca79c3e817f4f08fae49459316119e742af
INFO [08-24|21:21:13.707] Writing IPFS private data hashes to passport fact_provider=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB key="[237 248 226 187 72 113 242 255 118 211 170 139 157 195 37 45 160 108 74 82 0 0 0 0 0 0 0 0 0 0 0 0]"
INFO [08-24|21:21:14.294] Waiting for transaction                  hash=0xb6b15d23e004eac5baf0ff6b09289467eeb345ae4514dc8eecfe3fa5243b5101
INFO [08-24|21:21:22.558] Transaction successfully mined           tx_hash=0xb6b15d23e004eac5baf0ff6b09289467eeb345ae4514dc8eecfe3fa5243b5101 gas_used=136415
INFO [08-24|21:21:22.558] Ticket info                              tx_hash=0xb6b15d23e004eac5baf0ff6b09289467eeb345ae4514dc8eecfe3fa5243b5101 ipfs_hash=QmentPHPSk9aj4Xb8m3oHdTDcQCVyq5bp7j9X9WZ5b8vqM

Participant 1 (Dima) reads the ticket

./bin/tm read-ticket \
  --eventaddr=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 \
  --participantaddr=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70 \
  --privatekey=./event-participant1.key \
  --backendurl=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041 \
  --ipfsurl=http://127.0.0.1:5001/

Output:

INFO [08-24|21:24:33.573] Reading private data hashes from Ethereum passport=0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70 fact_provider=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB fact_key="[237 248 226 187 72 113 242 255 118 211 170 139 157 195 37 45 160 108 74 82 0 0 0 0 0 0 0 0 0 0 0 0]"
INFO [08-24|21:24:33.574] Getting IPFS private data hashes         fact_provider=0xC501F94F846ff03291f760f44e438DeAb1Eb3dCB key="[237 248 226 187 72 113 242 255 118 211 170 139 157 195 37 45 160 108 74 82 0 0 0 0 0 0 0 0 0 0 0 0]"
INFO [08-24|21:24:33.703] Reading ephemeral public key from IPFS   hash=QmentPHPSk9aj4Xb8m3oHdTDcQCVyq5bp7j9X9WZ5b8vqM filename=public_key
INFO [08-24|21:24:33.711] Reading encrypted message from IPFS      hash=QmentPHPSk9aj4Xb8m3oHdTDcQCVyq5bp7j9X9WZ5b8vqM filename=encrypted_message
INFO [08-24|21:24:33.712] Reading message HMAC from IPFS           hash=QmentPHPSk9aj4Xb8m3oHdTDcQCVyq5bp7j9X9WZ5b8vqM filename=hmac
Ticket QR: 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

Volunteer validates the ticket of participant 1 (Dima)

./bin/tm validate-ticket \
  --eventaddr=0xEDf8e2Bb4871f2ff76D3aa8B9Dc3252dA06c4a52 \
  --ticket=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 \
  --backendurl=https://ropsten.infura.io/v3/e82ae97170b0425d99684d6767e20041

Output:

Valid ticket for participant DID: 0x778Eb97D8F3938a13aBB9Ba26176752511d1eD70

TODO

Because not all awesome things can be finished in 36 hours.

• OpenZeppelin GSN "meta transactions" to make a seamless onboarding for users who sign-up for event. Because that's the only right way for user onboarding.
• React for the dApp interface. Because we still need to make functional testing of the "backend".
• Event Organizer must instantiate a local IPFS node during event using #dappNode for storing tickets only during event and turn of the node afterwards.
• A Participation validator should be writing a fact to Participant's DID contract that a ticket was already used/validated.