In security design, a tamper-evident hologram or holographic seal makes an unauthorized access to the protected object easily detectable.
The package of Trezor One is protected by a tamper-evident hologram seal. If the sticker is torn or damaged in any way when delivered, please contact our Support Team immediately.
Trezor Model T
Anybody trying to tamper with the device needs to detach the hologram first. This will completely destroy the hologram and leave a residue. A device with a missing or destroyed hologram, or a glue residue should be deemed as tampered. In such case, please contact our Support Team.
If the device USB-C port is covered with a Trezor hologram and the device does not show any warnings when starting, it can be safely assumed that nobody modified the device during the transport.
Apart from the physical tamper-evident hologram, the Model T also uses software safeguards against tampering. The device firmware and bootloader are signed by SatoshiLabs, and these signatures are checked whenever you start the device. The Trezor will warn you if the signatures are invalid.