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• A method for transferring value over the internet
• Each transaction transfers bitcoins from inputs to outputs
• Transactions stored publicly on blockchain
Tx
Tx
Bitcoins
• How to track stolen bitcoins?
• Coinbase needs to know the history of the bitcoins they process
• This can be done with data on the blockchain, but it’s hard.
Tracking Bitcoins
• Height - number of tracked coins at an output
• Shade - fraction of coins in an output which are tracked
Tx
Tx
A Graphical Tool