Tokenized trading cards solved ownership and trading. However, they left one question open. What can a collector actually do with a card after buying it? Natsuki, founder of Rosentica, built One Arena to answer that question on Solana.
Natsuki sat down with Genfinity’s Ryan Solomon to walk through the platform. He lives in Tokyo and travels to Seoul often. He describes the product as an RWA collectibles application layer, a place where graded Pokemon, One Piece, and Yu-Gi-Oh cards fight each other in one arena. Notably, the name comes from that idea.
Rosentica founder Natsuki explains how One Arena builds an RWA collectibles application layer on Solana, with Pack Royale, Seeker Cup, and a Tokyo Dome City push.From Shadowverse to onchain ownership
Natsuki has played trading card games since childhood. His father took him to a card shop, and the hobby started with Magic. Later, he worked at Shadowverse, which he describes as the Japanese answer to Hearthstone. That job shaped the thesis behind Rosentica.
Online card games gave players deep collections, but players never owned a single card. Physical collectors, in contrast, trade cards that hold real market value. Natsuki saw a gap between those two worlds. Meanwhile, RWA technology already offered the bridge, because tokenization brings cards onchain and proves ownership.
One Arena builds on that bridge. Players can battle with a graded Charizard against a Luffy or a Nami, even across franchises. Rosentica’s work earned recognition within Solana’s builder community. Solana’s June 2026 ecosystem roundup lists One Arena among its Frontier Hackathon winners. Additionally, Colosseum placed Rosentica in its fifth accelerator cohort.
Pack Royale brings the card shop online
The first screen in One Arena is the gacha page. It carries packs across Pokemon, One Piece, Dragon Ball, Riftbound, football, baseball, and sports cars. Collectors who already own cards can skip the packs and head straight to the games tab. That tab holds the core of the product.
Pack Royale is the flagship mode. Three to five friends enter a room, open a pack together, and fight with the pulled cards. The winner takes the cards home. Natsuki compares the lobby to a card shop where strangers wander over and join a table.
That comparison drives the whole design. Natsuki loves the card shop experience, but nobody can visit one around the clock. Many cities and countries have no TCG culture at all, even though fans live there. As a result, One Arena aims to deliver the social side of the hobby anywhere with an internet connection.
A second mode, Arena Shootouts, borrows from FIFA penalty kicks. One player picks a shooting direction, and the opponent picks a direction to save. However, the outcome also depends on each card’s skills and power levels. Baseball, Riftbound, J-pop, and K-pop modes sit on the roadmap.
PACK ROYALE IS LIVE! $1K PACK. 10 players. $100 each. One champion takes it. First come, first serve. JOIN NOW 🏆 https://t.co/ZT2f0DyaXz
— Rosentica: One Arena (@Rosentica) September 25, 2026
Arena Silver and the Seeker Cup
Rewards sit at the center of the economy. Players earn Arena Silver on every purchase. Every $50 spent returns one silver, and one silver equals roughly one USDC. Natsuki frames that as a 2% cashback that beats the odds of most gacha machines.
Silver then works like arcade tokens. A player can enter any game mode with free silver and chase a prize card. Natsuki says prizes currently reach about $4,000. He pictures four friends in a room with a $3,000 card on the line.
The Seeker Cup shows the same idea at tournament scale. One Arena launched on Solana Mobile’s Seeker roughly a month before the interview. Solana Mobile promoted the launch, and the cup carries a $50,000 prize pool. The grand prize is a Charizard, and Natsuki joked that he hates giving it away. One Brat fan, Triple Seven, held a commanding lead with a week left.
Why Solana fits a flexing culture
Interviewer Ryan Solomon pressed on why a TCG product belongs on Solana. Natsuki answered with collector psychology. Western collectors, he says, want to show off their best card. Today, a $50,000 Charizard in a wallet does nothing. In One Arena, that same card can win a fight, and the win feels good.
He argues that flexing drives collecting in every category, including art, comic books, and watches. Solana, in his view, hosts the most active users and the strongest culture of social openness. Furthermore, he says the builder community cheers for new projects. He came from another ecosystem and calls the difference massive.
His advice to consumer app teams is blunt. He believes no better home exists than Solana for that category. Solomon backed the point from his own interviews, noting a consistently strong consumer base across verticals. He added that culturally relevant products matter most, and fandom qualifies.
Tokyo Dome City and the super collector vision
The biggest near-term move is a partnership with Tokyo Dome City. Natsuki says the program kicked off on the Monday of the interview week. The venue includes Japan’s largest stadium and a theme park, and it hosted a Yu-Gi-Oh championship last year. Its operators want to extend in-person fan experiences into online play.
Natsuki offers a baseball example. Fans scan a QR code while waiting for a game and receive a card. Two fans then play against each other, with an Otani pitching and an Otani batting. The activation starts with baseball and expands to K-pop and J-pop events. Importantly, the users need no crypto knowledge, because they share a love of the game.
The longer vision is a “super collector” app. A user would log in and see Dragon Ball, Pokemon, and baseball cards in one place. Then they could play with friends and strangers in any category. Natsuki also eyes music photo cards and rhythm games.
His team already tested the pull of the idea. The Riftbound community, built around the League of Legends card game, responded strongly to online play. Moreover, an offline activation during Korea Blockchain Week in Seoul drew enthusiastic collectors. Natsuki believes the model reaches well beyond trading cards.
