2026年5月、日本古銭の真贋証明にブロックチェーン技術を活用したデジタル証明書の標準化が本格的に始動した。古銭一枚一枚に固有のデジタル識別子を紐付ける「古銭デジタルパスポート」構想が、業界団体・鑑定機関・テクノロジー企業の共同作業として進められている。
Japanese Old Coins Digital Certificates: Toward Standardization of Blockchain-Based Authenticity Verification

ITTENDO tracks auction records and market charts so you always know the current value of Japanese antique coins. Add coins to your Vault to stay on top of price changes.
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Dealers Handling This Category
A reference when considering a sale or appraisal. All are dealers and auction houses with a proven track record.
Ginza Coins
Ginza, Chuo-ku, Tokyo
One of Japan's most established numismatic dealers. The scale and variety of their regular auctions is among the largest in the country. Their catalogs are considered a benchmark for market pricing.
Japan Coin Auction (JCA)
Tokyo
Holds regular auctions with reliable hammer price data, making it a useful resource for tracking market values. Caters to a wide range of collectors from beginners to advanced buyers.
Taisei Coins
Tokyo
A dealer with an international network. Offers advanced services such as consignment to overseas auctions and NGC/PCGS grading submission. Recommended for high-value or internationally recognized coins.