TechFlow reports, on June 30, Galaxy Research stated in a post on platform X that Casascius is a physical Bitcoin commemorative coin containing a Bitcoin private key inside and sealed with a holographic sticker; if the holographic sticker is torn off, the private key will be exposed, allowing the holder to transfer the corresponding BTC on-chain.
Between 2011 and 2013, approximately 28,000 Casascius coins were minted, cumulatively holding approximately 91,469 BTC; as of now, only about 35,300 BTC among these physical coins remain in an "unspent" state. Among them, founder Mike Caldwell produced 22 premium versions of Casascius with a face value of 1000 BTC between 2011 and 2013, including 16 gold-plated bars and 6 pure gold coins; by 2014, 16 of them had been redeemed.
It is worth noting that the remaining 6 pure gold coins of 1000 BTC remained unopened for about 11 years, until December 5, 2025, when two of them were transferred on the same day, releasing a total of 2000 BTC; currently, 4 gold Casascius coins of 1000 BTC remain sealed.
