Blocky saysNFT metadata can live on-chain, on IPFS, or on a centralized server — with very different durability.
An NFT usually stores a tokenURI pointing at metadata (name, image, traits). Where that lives matters: on-chain (fully permanent, expensive), IPFS (content-addressed, durable if pinned), or a centralized server (cheap but the image can vanish or be swapped if the company dies). "Owning" an NFT whose image is on someone's server is fragile.
Power-ups you unlock
tokenURI points at the metadata
On-chain: permanent but costly
IPFS: content-addressed, durable if pinned
Centralized URL: cheap but can disappear
Double-Spend Dan attacks — common mistakes
NFTs pointing at a mutable centralized URL
Assuming IPFS persists without pinning
Ignoring where the image actually lives
Boss battleRank on-chain, IPFS, and centralized metadata by durability.
Example code
<!doctype html><html><head><meta charset="utf-8"></head>
<body style="background:#06040d;color:#e6e0ff;font-family:monospace;padding:20px"><pre>on-chain → permanent (expensive)
IPFS → durable if pinned (content-addressed)
centralized→ can vanish/change if server dies</pre></body></html>