The digits you can see are the public key, the private key remains hidden under the bottom half of the hologram.

Once removed the holograms leave a 'VOID' mark on the coin and are damaged/ would be very hard to replace.

Hoping to get a few on display in London/ Amsterdam soon... (currently only on display in the Isle of Man - first coin was donated to local museum and samples are on display in a local craft shop/ believe there is also one in a display cabinet in a reception to government department)