This doesn't prove Coinbase gets their Bitcoin from Bitstamp, but the plot makes a compelling inference worthy of further research: "Coinbase buy price is pegg

This doesn't prove Coinbase gets their Bitcoin from Bitstamp, but the plot makes a compelling inference worthy of further research: "Coinbase buy price is pegged to Bitstamp" (Dec 2013): https://bitcointalk.org/index.php?topic=392422.0 https://bitcointalk.org/index.php?topic=392422.0