On December 31, 2012, Bitcoin (BTC) had a market capitalization of $142.8M, based on 10.61M coins issued at a price of $13.45.

bitcoin market capitalization 2012
DATE CLOSE BTC MINED MARKET CAP
December 31 2012 $13.45 10,614,050 $142,758,972.50
December 30 2012 $13.40 10,610,100 $142,175,340.00
December 29 2012 $13.42 10,605,950 $142,331,849.00
December 28 2012 $13.42 10,602,350 $142,283,537.00
December 27 2012 $13.47 10,598,125 $142,756,743.75
December 26 2012 $13.35 10,594,225 $141,432,903.75
December 25 2012 $13.38 10,590,375 $141,699,217.50
December 24 2012 $13.31 10,587,275 $140,916,630.25
December 23 2012 $13.37 10,583,975 $141,507,745.75
December 22 2012 $13.50 10,580,925 $142,842,487.50
December 21 2012 $13.52 10,577,100 $143,002,392.00
December 20 2012 $13.60 10,573,950 $143,805,720.00
December 19 2012 $13.30 10,571,300 $140,598,290.00
December 18 2012 $13.25 10,567,750 $140,022,687.50
December 17 2012 $13.30 10,564,625 $140,509,512.50
December 16 2012 $13.49 10,561,275 $142,471,599.75
December 15 2012 $13.60 10,558,500 $143,595,600.00
December 14 2012 $13.70 10,555,600 $144,611,720.00
December 13 2012 $13.70 10,552,950 $144,575,415.00
December 12 2012 $13.56 10,549,675 $143,053,593.00
December 11 2012 $13.43 10,546,425 $141,638,487.75
December 10 2012 $13.39 10,542,825 $141,168,426.75
December 09 2012 $13.42 10,539,250 $141,436,735.00
December 08 2012 $13.50 10,536,100 $142,237,350.00
December 07 2012 $13.30 10,532,650 $140,084,245.00

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