NFT smart contract release, blind box, public offering technology practice -- jigsaw puzzle

Let's move on to the contract and explain the jigsaw puzzle .

There are two main functions to be realized in jigsaw puzzle ：

• How to quickly make a variety of puzzles and meta Information
• How to upload ipfs Interstellar network system ( Test network )

The bill of materials to be prepared before starting is as follows

• OpenSea Test network  https://testnets.opensea.io/
• HashLips Group drawing project  GitHub - HashLips/hashlips_art_engine: HashLips Art Engine is a tool used to create multiple different instances of artworks based on provided layers.
• ipfs Upload space  Pinata | Your home for NFT media

Practical steps

1. from git Upload and download Hashlips project

 2. stay vs Open the project program , find main.js in take startCreating Methods 343 Change line to i =0;

3.cd Go to the local path of the project , And then run yarn install, Install related packages

4. After the related packages are successfully installed , Input yarn run build, Build the project locally . After success , as follows ：

At this time, five pictures will be generated , Open the directory of project image generation build, See the corresponding five pictures generated

  The first red box is five pictures , The second picture is corresponding to five pictures meta Information , Open to see the attributes and weights of the corresponding image , At the same time layers Folder , It will divide the picture into many layers , Random splicing .

 5. Then we will config.js As shown in the figure layerConfigurations Change the quantity to 10 Zhang , And then go ahead and do it yarn run build command , After successful execution , Will generate 10 A picture .

 6. open Pinata Website , Will just generate 10 Upload pictures .

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  The success is as follows

7. Then open the code , Replace the text in the green box with cid

 8. After the update is successful , And then enter

  After success , open json Any file in , notice image The address in is replaced by the one just CID

 9. take Json The folder continues to upload the whole package

 

 10 Start making blind box pictures , We from layers Take out a black background picture as the cover of the blind box

 11. And then create a new one unpack Folder , Name the picture unpack.png picture , And create a new one unpack.json file , It reads as follows .

 

  In the red box is the picture you just uploaded CID.

 12.remix Find the function in the red box , Then put the... In the figure above unpack.json Of CID assignment , Assign to the red input box , At the same time, prefix with **ipfs://,** Then click the button .

 13. stay setBaseUrl Set in meta_jsons Of CID, Also prefixed ipfs:// , At the same time, add /, because meta_jsons Is a collection , So add / , Click the button after completion .

  Wait for the above transactions confirm after , Then open the ipfs The test network of , This is the time , A black picture will appear , In fact, it is the form of a blind box .

14. Click the function in the red box , The blind box function will be turned on , Wait for the deal to complete , go back to ipfs On , You will see the shape of the blind box you just drew .

  The above is the mainstream Nft How to play the blind box , Introduction .