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

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.

  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 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.

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