NFC was one possible solution for the "Out-of-Band" pairing defined in the Bluetooth spec. The spec. allowed to exchange encryption keys with a different metho

NFC was one possible solution for the "Out-of-Band" pairing defined in the Bluetooth spec. The spec. allowed to exchange encryption keys with a different method than Bluetooth, Sony is using it on the Playstation to perform BT-pairing via USB. Commercially, NFC was mostly used to initiate pairing, by having a NFC Tag on the accessory which stored the Bluetooth address, and a device scanning the tag would initiate pairing with the device directly. The pairing itself is technically still done over Bluetooth, which is nowadays mostly a matter of confirming the operation...