In addition to the scratch-off hologram (pictured above in action), these coins contain another unique security feature. Each has a gold-tone security sticker around the hologram, which serves several purposes from preventing the removal and replacement of the hologram to preventing the coin from being accidentally scratched in the process of scratching off the hologram. It of course also serves as a visual feature, bearing images of the logo. This is the only physical Bitcoin made in the denomination of three.
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