Proof of Integrity
We publicly introduced the concept of Proof of Integrity along with our first release of PSA Graded Pokémon cards as Connected Collectibles. In short, a Proof of Integrity acts like a tamper-proof seal and establishes that every Courtyard NFT is provably linked to a unique matching physical item stored in our vaults. If someone tries to alter the NFT's fingerprint (i.e. its identity), the Proof of Integrity will show that the token is corrupted.