A Solana Students Africa campus tour across five Nigerian universities minted 214 on-chain credentials for 520 attendees. Using compressed NFTs, organizers created two tiers: a Participation POAP for all attendees and a Builder POAP for those who deployed a program on-chain. The goal was to provide permanent, verifiable credentials instead of disposable PDF certificates.

The cost difference is stark. Traditional NFTs on Solana cost about $2 each to mint, making large-scale events prohibitively expensive. Compressed NFTs, using Metaplex's Bubblegum protocol and Arweave storage, slashed the per-mint cost to roughly $0.0001. The entire batch of 214 POAPs cost only 0.05 SOL (about $7) and took six hours to build.

Execution revealed practical challenges. Only 122 of 520 attendees submitted a wallet address, highlighting the friction of manual entry. Data from Luma and Google Sheets required fuzzy matching to align names. The builder verification originally planned for on-chain checks pivoted to using self-reported Program IDs from the registration form when public RPC rate limits hit.

The project demonstrates a viable model for affordable, scalable on-chain credentials. For educational programs and hackathons, compressed NFTs make issuing permanent, portable proof-of-achievement economically feasible. The open-source pipeline provides a blueprint, though future iterations would benefit from wallet-connect integration to eliminate copy-paste errors.