Proof

Proof of Connection
"Proof of winning the battle in the portal at Disney Castle. Perhaps it has changed Sora."
Japanese	つながりの証
Rōmaji	Tsunagari no Akashi
Translation	Connection Proof
Item	Rank	Buy	Sell
Proof of Connection	—	—	—

Proof of Nonexistence
"Proof of defeating all the Organization XIII's replica data in the Garden of Assemblage. Perhaps it has changed Sora."
Japanese	存在しない証
Rōmaji	Sonzaishinai Akashi
Translation	Non-existent Proof
Item	Rank	Buy	Sell
Proof of Nonexistence	—	—	—

Proof of Peace
"Proof of appeasing the Mushroom XIII. Perhaps it has changed Sora."
Japanese	安らかなる証
Rōmaji	Yasurakanaru Akashi
Translation	Tranquil Proof
Item	Rank	Buy	Sell
Proof of Peace	—	—	—

Proof of Promises
"A certificate awarded to those who have collected all the luck from worlds over."
Japanese	約束の証
Rōmaji	Yakusoku no Akashi
Item	Rank	Buy	Sell
Proof of Promises	—	—	—

Proof of Times Past
"A certificate awarded to those who have endured the most difficult trial of them all."
Japanese	過ぎ去りし証
Rōmaji	Sugisarishi Akashi
Item	Rank	Buy	Sell
Proof of Times Past	—	—	—

The Proofs are sets of key items which appear in Kingdom Hearts II Final Mix and Kingdom Hearts III, which are obtained after completing specific side-missions.

List of Proofs

Kingdom Hearts II Final Mix

The Proof of Connection is obtained by defeating the Lingering Will, the Proof of Nonexistence is rewarded after defeating all of Organization XIII's Replica Data, and the Proof of Peace is given after appeasing the entire Mushroom XIII. Possessing a Proof grants Sora a crown costume modification.

Kingdom Hearts III

Added in update 1.04 on April 23, 2019, the Proof of Promises is obtained by photographing all 90 Lucky Emblems and clearing the game, while the Proof of Times Past is obtained by clearing the game in Critical Mode. Proofs carry over through New Game+.

As of version 1.07, released on January 22, 2020, the Proof of Promises and Proof of Times Past can be exchanged at the Moogle Shop for the Oathkeeper and Oblivion, respectively.