1/ Did some investigating into storing NFT metadata fully on-chain, especially with respect to large images.

First, The data URI length can be several KB (64 KB+) long:

1/ Did some investigating into storing NFT metadata fully on-chain, especially with respect to large images.

First, The data URI length can be several KB (64 KB+) long:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs#length_limitations

Developer 👨🏽‍💻. Angel investor. Ex-Ethereum Foundation. Eth2 validator. Thoughts on blockchain, tech, strategy, economics.

3/ For still images, there is no need to use the attribute "image_data" [1] instead of "image" in the metadata since "image" is already widely supported and can point to really long image data URIs.

[1]

3/ For still images, there is no need to use the attribute "image_data" [1] instead of "image" in the metadata since "image" is already widely supported and can point to really long image data URIs.

[1] https://docs.opensea.io/docs/metadata-standards


4/ In Metamask I couldn't get the image to show up in the viewer, though it did in the transaction finalization screen when I tried to send the NFT to another wallet. Perhaps it was a cacheing isssue due to initial metadata being malformed?

5/ The polygon collection (with images >3000 bytes) can be viewed at [1].

However, Polyscan doesn't render the images. As of yet Opensea Pro (on Polygon) is unable to load the metadata or image :/

[1]

5/ The polygon collection (with images >3000 bytes) can be viewed at [1].

However, Polyscan doesn't render the images. As of yet Opensea Pro (on Polygon) is unable to load the metadata or image :/

[1] https://polygon.nftscan.com/0x7d6d005ec1cc8ec979fb6d439fbe9c96f9ed3ab0?module=NFTs

6/ I'm still investigating compatibility and support, and will report on further findings in this thread.

Here is the Github to the repo for generating the collection and setting token URIs:

6/ I'm still investigating compatibility and support, and will report on further findings in this thread.

Here is the Github to the repo for generating the collection and setting token URIs:

https://github.com/hiddentao/onchain-nfts

2/ Both SVG and PNG data URIs seem to work. Presumably other file formats would also work.

It's expensive to write KB of data to a storage slot (duh!), so an L2/L3 with periods of low gas feed - e.g 1 Gwei - is essential to minimizing overall cost to caller.