That was copied from a different site,
I wish not to promote the competitors.
The open source app BitNFC makes it possible to save Bitcoin addresses in such a way that they can be called up again using the app. You can store mBTC (Micro-Bitcoin), fractions of a bitcoin, on the implant and manage it as a wallet as usual. The great thing about this app is, on the one hand, that it is available OpenSource and, on the other hand, it can be downloaded from the website completely free of charge. If you want to make something yourself, you can download and edit the source from Github.
The most convincing thing about the app is that using the blockchain, the bitcoins on the X2 chip implant are “neutralized” after use. The address does not change, but the value of addresses, i.e. bitcoins, is adjusted by the blockchain. In concrete terms, this means that if you load 0.02 BTC onto the implant and use this address for a payment of 0.02 BTC, this address, i.e. wallet, has a value of 0.00 BTC without synchronizing with the smartphone got to.
From first reading (Only), it sounds as it should be.