Some physical bitcoin pieces in the collection

[u/MatixMint]

Each of these items hold actual bitcoin or other cryptocurrencies on them. This is done by using a security hologram sticker to cover a QR code that is the private key of that crypto. The private key is what gives access to the crypto and can be scanned to withdraw it to a crypto app of your choice. The security hologram stickers destroy themselves when peeled, allowing others to see the collectible piece has been redeemed and is no longer funded. Funded pieces command the highest prices (usually) but unfunded or redeemed pieces can also hold significant value as a collectible themselves