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.