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0 sats \ 0 replies \ @cryptocoin 7 Jun 2022 \ parent \ on: Offline Cash - Physical Bitcoin Notes with NFC and Beautiful Designs bitcoin
Close. The Casascius coins had a private key underneath a tamper-evident hologram sticker.
This seems more like the OpenDime. Where to redeem it you physically alter it (by cutting the "wire" (trace) so that it then changes state to reveal the private key.