According to Einstein, one sat currently "weighs" about a nanogram.

Bitcoin mining energy = 400 TWh per year

Bitcoin mined = 164,250 btc per year

Energy per bitcoin mined = 2.435 GWh per btc

(Conversion: 3.60E+12 Joules per GWh)

Energy per bitcoin mined = 8.77E+12 Joules per btc

Speed of light: 3.00E+08 m/s

(Mass/energy equivalence: E=mc^2)

Mass of one bitcoin: 9.74E-05 kg per btc

(Conversion: 1.00E+08 sats per btc)

Mass of one sat: 9.74E-13 kg per sat

(Conversion: 1.00E+12 nanograms per kg)

Mass of one sat: 9.74E-01 nanograms per sat