NFT Format
Final filetype: PNG

PNG is stored on chain. Depending on the chain the token format or contract may differ.

Ergo
----
Type: EIP-OO4
On-chain format placed in R4.
Link in R9 points to a scaled-up version of the PNG. Original PNG tends to be quite small and this makes viewing it in various places much nicer.
8% Royalty
Minted with ergoauctions.org or own minter.


The basic on-chain format is below.

Name: <Name>
Set: <Set Name> (<Set Ticker>)
<URL to nft info on website>
1010s ART by the Dark Lord of Programming
@the_dlop

BEGINFILE
<BASE64 ENCODED PNG>
ENDFILE


This format uses the Ruby 3.0.1 Base64 Encoder 
https://ruby-doc.org/stdlib-3.0.1/libdoc/base64/rdoc/Base64.html
Notes on Base64.encode method:

Returns the Base64-encoded version of bin. This method complies with RFC 2045. 
Line feeds are added to every 60 encoded characters.


To convert to png on linux:
Paste <BASE64 ENCODED PNG> into file, lets name it 'encoded.txt'.
Then we will need to remove all the newlines before decoding it.
We can do this with a sequence of commands:

cat encoded.txt | tr -d \\n | base64 -d - > image.png

The decoded image should now be in image.png.


An example from OTC 1:
https://twotens.art/sets/otc/1.html
https://ergotokens.org/#/?token=c371b09774de394442258f3066f040b18a0b28b24e203a8f57b0a10c83180541


Name: OTC 1
Set: Others (OTC)
https://twotens.art/sets/otc/1.html
1010s ART by the Dark Lord of Programming
@the_dlop

BEGINFILE
iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAMAAADXEh96AAAABHRFWHRpADU5
DJ4kfwAAAAN0RVh0ZgAzxWrV3AAAADNQTFRFAAAAAgICCAgIGwI1KRBDKxJF
MxpNSzJlXEN2bVSHfmWYj3apkHeqoYi7sZjLspnMw6rdPdoNfQAAAC9JREFU
eJxjYmRgYmHnZOLiY+FgZWZi/MfOyMjIxMjMBALMQDbjN6Yfvz5/+PAbAEID
CCKDnUU5AAAAAElFTkSuQmCC

ENDFILE


Dark Lord of Programming