Some clarification about blackbytes I found in the white paper:
1. Blackbytes are a separate currency within the byteball system.
2. Blackbyte cap is 2,111,100,000,000,000
3. The number of blackbytes is 2.1111 times the number of bytes therefore each of us received 2.1111 more blackbytes than bytes.
3. To pay with blackbyte you need to first pair your device with the recipient's device and establish secure communication. Then you pay via chat message.
Very useful information, Davidoski! Thank you very much!