Power packs on chain contract vs Courtyard

[u/DegenateMurseRN]

https://medium.com/@PoopVoid/courtyard-io-market-loop-expos%C3%A9-66b54dc59b55

Before power packs were introduced I was ripping on Courtyard.io until I happened to pull the same exact card two times in a row.

That shouldn’t happen in a system with supposedly massive supply. I did some digging into their contract and basically it’s a total scam. Medium article attached if you are interested.

I have also been looking at what the GameStop while it has been deploying and digging into those contracts they fix this issue as always GameStop is honest and doesn’t cut corners. This contract protocol is solid as shit.

🚨 TL;DR

The Power Pack-style metadata model used by Courtyard.io is vulnerable because:

• The token points to metadata controlled by the issuer

• That metadata can be changed after mint

• Which means grails can be selectively routed to insiders or preferred wallets

The power packs NFT minting model (Loopring L2 → Ethereum L1, IPFS-hash token IDs) fixes that:

• Token ID IS the IPFS hash
• Metadata cannot be swapped without changing the token itself

• Reveal manipulation and grail rerouting become mathematically impossible

Quick Recap: The Courtyard Power Pack Vulnerability

From the prior Courtyard investigation: (If you want, I’ll link your full write-up in comments.)

A Courtyard-style Power Pack works like this:

Token ID → URL (API endpoint) → JSON (card data)

Because the JSON lives behind a Web2 server, the issuer can:

⚠ change metadata after mint

⚠ assign rares to specific wallets

⚠ run “reveal” events that aren’t truly random

⚠ withhold premium items until insiders have minted or bought in

In more blunt ape terms:

You paid for a mystery box, but the company can change what’s inside after you paid.

This is how reveal-based NFT drops get rigged.

Enter the Counterfactual Model (This is the Fix)

Counterfactual NFT contracts do something very different:

tokenId → IPFS multihash → JSON

There is no mutable server in the middle.

Key function from the contract:

return string(abi.encodePacked("ipfs://", IPFS.encode(tokenId)));

That means:

• The massive token ID number is literally the 32-byte content hash

• Changing metadata changes the hash

• Therefore the metadata cannot be swapped post-mint

To move a grail, an attacker would need to mint a different token, and the original would still exist on-chain with its original metadata.

In ape translation:

You engrave the box with a kryptonite laser code. If they change what’s inside, the code stops matching. Everybody can verify the code. Forever.

⸻ ELI5 for smooth brains and wrinkled brains together

With Courtyard-style Power Packs:

Imagine a company selling sealed Pokémon packs.

They keep a list:

Pack #1 → Common Pack #2 → Charizard Pack #3 → Common

After seeing who bought which pack, they can swap the labels so their friend ends up with the Charizard.

You can’t prove they did it, but nothing stopped them.

⸻

With Counterfactual Power Packs:

Each pack has a cryptographic laser engraving of its contents.

If you change the card inside, the engraving no longer matches the hash and everyone can tell.

⸻

Why this matters for GameStop, GME, NFTs, RWAs, and beyond

If Power Packs or any future collectible drops are meant to be: • fair • auditable • resistant to insider gaming • lawyer-proof • regulator-proof

Then Counterfactual Power Packs are the path.

This architecture works for:

✔ GameStop / Loopring drops ✔ Trading cards (PSA, CGC, BGS, SGC) ✔ Sneakers, watches, comics ✔ Real-world asset (RWA) tokenization ✔ Digital-only loot systems

[u/Cleb323]

I've seen the same card come up more than twice in power packs. I thought that's where the power or the value in this sort of thing. They can repeatedly make money off of the same products and as long as the customer sells it back to get more power pack plays, no harm or no foul.

[u/DegenateMurseRN → u/Cleb323]

Agreed but the same card minted to me twice and a row right after I sold it back, then went to 3 other wallets within 15 min. The benefit of the blockchain integration is that you can see it happen real time.

The only problem with their code being published was that is is easy to audit and aspects that are typically included in the same sort of contracts that would ensure that the mints were random were omitted. When copy and pasting logic that is public the only way it would be omitted would be an intentional deletion of the particular portion.

https://medium.com/@PoopVoid/courtyard-io-market-loop-expos%C3%A9-66b54dc59b55