https://github.com/shawntabrizi/substrate-one-million-remarks

One million pixel image, controlled by remarks on a Substrate blockchain.
https://github.com/shawntabrizi/substrate-one-million-remarks

Last synced: 4 days ago
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One million pixel image, controlled by remarks on a Substrate blockchain.

• Host: GitHub
• URL: https://github.com/shawntabrizi/substrate-one-million-remarks
• Owner: shawntabrizi
• License: mit
• Created: 2019-08-14T17:42:20.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2022-12-11T02:08:56.000Z (almost 2 years ago)
• Last Synced: 2024-05-01T14:17:56.890Z (7 months ago)
• Language: JavaScript
• Size: 490 KB
• Stars: 6
• Watchers: 3
• Forks: 3
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# substrate-one-million-remarks

 One million pixel image, controlled by remarks on a Substrate blockchain.

## How To

You can test this app by [running a local Substrate node](https://substrate.dev/docs/en/getting-started/installing-substrate).

1. Start the Substrate node (connects on `ws://127.0.0.1:9944` or `wss://dev-node.substrate.dev:9944`)

2. Start the app with `yarn && yarn start`

3. Open the [Polkadot UI](https://polkadot.js.org/apps/#/extrinsics) to submit an extrinsic.

4. Call `system > remark` with the following `_remark: Bytes` as a hex string:

	```

	0x1337xxxyyycccccc

	```

	> Note this hex string is read litterally (lol)

	

	* `1337` is the magic identifier to that the app uses to make sure the message is for this app

	* `xxx` is a number from 000-999 describing the x coordinates of the pixel

	* `yyy` is a number from 000-999 describing the y coordinates of the pixel

	* `cccccc` is a hex encoded RGB color of the pixel. So `000000` is black, `ffffff` is white, `ff0000` is red, etc...

5. Submit the extrinsic, and look at the updated `image.bmp`.