Compressed NFTs on Solana: Scaling to Millions

When we set out to tokenize wine bottles for dvinclub.com, the math didn’t work with traditional NFTs. Minting thousands of NFTs on Solana would cost a fortune in rent. Compressed NFTs changed everything.

The Problem with Regular NFTs

Each standard Solana NFT requires its own on-chain account, costing ~0.002 SOL in rent. At scale:

• 10,000 NFTs = ~20 SOL in rent alone
• 1,000,000 NFTs = ~2,000 SOL

For a tokenization platform expecting millions of assets, this was a dealbreaker.

State Compression to the Rescue

Metaplex Compressed NFTs (cNFTs) use concurrent Merkle trees to store NFT data off-chain while keeping a cryptographic proof on-chain:

• 1 million cNFTs cost roughly 5 SOL total
• That’s a 400x cost reduction over traditional NFTs

The tradeoff is that reads require an indexer (like Digital Asset Standard API), but writes remain on-chain and verifiable.

Architecture Decisions

We chose a tree depth of 20 with a canopy of 14, giving us:

• Max capacity of ~1 million leaves
• Reasonable proof size for transactions
• Enough canopy to keep transaction sizes manageable

const merkleTree = await createTree(umi, {
  maxDepth: 20,
  maxBufferSize: 64,
  canopyDepth: 14,
});

Verification

Every “Digital Cork” can be verified against the Merkle root stored on-chain. This gives us the same authenticity guarantees as regular NFTs at a fraction of the cost.

The key insight: for asset tokenization, you don’t need every NFT to live on-chain — you just need the proof to be on-chain.

Lessons Learned

1. Batch your mints — transaction batching with retry mechanisms is essential at scale
2. Index early — set up your DAS indexer before you start minting
3. Canopy matters — too small and your transactions won’t fit; too large and tree creation is expensive