Add automatic GO-721 / ERC-721 support

[treeder]

Detect GO-721 contracts and display all the appropriate information.

Should also be able to look at a particular item and view all the metadata about it along with the image of it. See https://docs.opensea.io/docs/2-adding-metadata for more information.

[treeder]

@bergauz where are we at with this?

[treeder]

For the particular item, after searching for it, have the URL be something like:

https://explorer.gochain.io/token/CONTRACT_ADDRESS/asset/TOKEN_ID

TOKEN_ID being the particular assets ID. The page to view the item would called tokenURI(tokenID) to get the metadata, then display it along with the image in the metadata.

[treeder]

BTW, on testnet and mainnet, this is a live contract address with some assets:

0x29af464A1099Ddf11C5770d8E05CBa18cAeF47d4

[bergauz]

For the particular item, after searching for it, have the URL be something like:

https://explorer.gochain.io/token/CONTRACT_ADDRESS/asset/TOKEN_ID

TOKEN_ID being the particular assets ID. The page to view the item would called tokenURI(tokenID) to get the metadata, then display it along with the image in the metadata.

@treeder does address need to be exactly as you wrote? since we use addr/address instead of token can it be https://explorer.gochain.io/address/CONTRACT_ADDRESS/asset/TOKEN_ID

[treeder]

That's how etherscan does it, good to be consistent with the norm: https://etherscan.io/token/0x06012c8cf97bead5deae237070f9587f8e7a266d#inventory

Could we alias token? (but only work if it's a token contract?)

[bergauz]

@treeder yes

[bergauz]

@treeder is there's metadata json structure standard? cause what i've checked here https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md and https://docs.opensea.io/docs/2-adding-metadata are different

[treeder]

One's in JSON schema format so it looks different, but the main ones are the following and the JSON will look like this, so just display these 3 values.

{
  "name": "Dave Starbelly",
  "description": "Friendly OpenSea Creature that enjoys long swims in the ocean.", 
  "image": "https://storage.googleapis.com/opensea-prod.appspot.com/puffs/3.png"
}

[bergauz]

@treeder @jmank88 we can close issue, right?

[jmank88]

IMHO the token page is not accessible enough. It should at least be linked from the normal contract page, or better yet merged together with it.

[treeder]

Agree, need an obvious way to access it from main contract page (or merge like @jmank88 said). If merged, keep both URLs though to conform with etherscan.

[treeder]

@bergauz let's merge /token/ and /addr/

They both have token like information, but one has different stuff than the other. Let's just make them the same page, make the /token an alias for /addr and take the extra things like the "Token type" chips and things from /token and add them to /addr.

[bergauz]

since support added, closing