Partial URL-Encoding
Use Data URL in the Metadata of your NFTs
Fully on-chain CNFTs are typically implemented by assigning appropriate Base64-encoded dataURIs to the token metadata's src and image fields. DataURIs can encode a variety of data types like HTML, audio, image etc. As a result, a fully on-chain NFT can virtually encode any type of media file as long as its metadata is no larger than 16Kb. This is a standard and general approach, with the main disadvantage being the same Base64 encoding, which may make the original data 30% larger (on average). This is a difficult limitation because the 16Kb limit is a hard constraint that must always be met.
To overcome this problem, a possible, non-standard solution that works well with textual data (e.g., html and svg) is to replace base64 encoding with a variant of the original plain text in which some special characters have been substituted by their url-encoded version.
In specific, there are the following replacements:
% is replaced by %25
is replaced by %23
< is replaced by %3C
> is replaced by %3EActually, to display the partially url-encoded, on-chain NFTs only characters % and # must be replaced. The substitution of characters < and > is only required by NMKR for minting.
Use case for URL encoding
This method is easy to implement and saves a lot of space, which allows to mint way more complex On-Chain NFTs to be encoded and minted. A common use case are interactive NFTs like games.
Example Metadata
{
"721": {
"4864e4cf3f7e7fd2318b3bb4a7060665278a47fc4a6216c55dcbbeb0": {
"chrz2": {
"Color": "Arctic white",
"Enemy (Ambushman)": "Face with symbols on mouth",
"Enemy (Happy Stoner)": "Zany face",
"Enemy (Professor)": "Exploding head",
"Enemy (Shadowman)": "Cowboy hat face",
"Hero": "Face without mouth",
"Keyboard controls": "Press any key to start, arrow keys to move hero",
"Power-up": "Nazar amulet",
"Special": "False",
"Touch controls": "Tap to start, swipe up/down/left/right to move hero",
"Twitter": "twitter.com/gamezonchain",
"Variant": "Classic",
"files": [
{
"mediaType": "text/html",
"src": [
"data:text/html;utf8,%3C!DOCTYPE html%3E%3Cmeta charset='utf-8'/%",
"3E%3Cbody style='margin:0;touch-action:none;overscroll-behavior:",
"contain;background:%23000;'%3E%3Ccanvas id='a' style='margin:aut",
"o;display:block;'%3E%3C/canvas%3E%3Cscript%3Efunction aa(a){var ",
"d=0;return function(){return d%3Ca.length?{done:!1,value:a[d++]}",
":{done:!0}}}function b(a){var d='undefined'!=typeof Symbol&&Symb",
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" var e,f,g,ba='ontouchstart'in window,h,l,n,p,q,r,t,u,v,w,x,y,ca",
",z,da=String.fromCodePoint(0x1F44E),ea=[String.fromCodePoint(129",
"311),String.fromCodePoint(129304),String.fromCodePoint(128077),S",
"tring.fromCodePoint(128074)],fa=String.fromCodePoint(0x1F9FF),B=",
"[String.fromCodePoint(0x1F920),String.fromCodePoint(0x1F92C),Str",
"ing.fromCodePoint(0x1F92F),String.fromCodePoint(0x1F92A),String.",
"fromCodePoint(128064)],C=[String.fromCodePoint(127817),String.fr",
"omCodePoint(127818),String.fromCodePoint(127826),String.fromCode",
"Point(127827), String.fromCodePoint(128142)],D,ha=String.fromCod",
"ePoint(128561),ia=String.fromCodePoint(0x1F636),E,ja,F,G,H,ka,I,",
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",2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1",
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"2,1,2,1,1,1,1,2,1],[1,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,1,2,2,2,2,2,",
"2,2,2,1,2,2,2,2,2,2,1],[1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,2,1,1,",
"1,1,1,1,1,1,2,1,1,1,1,1,1],[0,0,0,0,0,1,2,1,2,2,2,2,2,2,2,2,2,2,",
"2,2,2,2,2,2,2,1,2,1,0,0,0,0,0],[1,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,",
"0,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1],[2,2,2,2,2,2,2,2,2,1,0,5,5,0,",
"0,0,0,0,0,0,5,5,0,1,2,2,2,2,2,2,2,2,2],[1,1,1,1,1,1,2,1,2,1,1,1,",
"1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1],[0,0,0,0,0,1,2,1, 2,2",
",2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,1,0,0,0,0,0],[1,1,1,1,1,1,2,1",
",2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1],[1,2,2,2,2,2",
",2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1],[1,4,1,1",
",1,1,2,1,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,2,1,1,1,1,2,1],[1,2",
",2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,4,2,1],",
"[1,1,1,1,2,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,2,1,1,1",
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",2,2,1],[1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,1,1, 1,1,1,1,1,1,",
"1,1,1,1,2,1],[1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,",
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");A.gain.linearRampToValueAtTime(0,N.currentTime+k/1E3);R.freque",
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"er('resize',function(){clearInterval(Ka);cancelAnimationFrame(x)",
";cancelAnimationFrame(w);S()});S(); %3C/script%3E%3C/body%3E"
]
}
],
"image": [
"data:image/svg+xml;utf8,%3Csvg width='500' height='560' viewBox=",
"'0 0 500 560' xmlns='http://www.w3.org/2000/svg'%3E %3Crect widt",
"h='500' height='560' fill='%23F4F3EF' /%3E %3Ccircle stroke='%23",
"ba0001' stroke-width='10' cx='250' cy='250' fill='%23000' r='24",
"0'/%3E%3Cg text-anchor='middle' style='font:700 50pt monospace' ",
"fill='%23ba0001'%3E%3Ctext x='50%25' y='25%25'%3E C H R Z %3C/te",
"xt%3E %3Ctext x='50%25' y='240'%3E &%23x1F920; &%23x1F92C; &%23x",
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],
"mediaType": "image/svg+xml",
"name": "CHRZ #2"
}
}
}
}The check metadata option in NMKR is not able to verify whether the metadata are syntactically correct. Please, if in doubt, mint a test NFT.
Example NFT
Special credits to Gamez On Chain for providing a lot of valuable information to this topic.