The Bitcoin banknote is an offline cold storage solution. All of our banknotes are handmade with quality and security in mind. Your private key is kept under a light-blocking seal, to prevent "candle-lighting". We use high-quality cotton paper for security and durability, giving it a real banknote feel. Our notes make great gifts for crypto lovers. Made with a classic design and a similar look and size to US currency, there isn't an easier way to add a cold storage solution to your crypto portfolio. Features: - High-quality cotton paper. - Serialized bills. - Holographic scratch-off seal. - Light-blocking material covering your private key. - 64 x 144 mm dimensions. (2.52 x 5.67 in) - Functional QR codes.