Bitcoin uses a curious accounting structure called a UTXO — an Unspent Transaction Output. All UTXOs are timestamped by the transaction/block in which they were created. Since all bitcoin in existence is contained in some UTXO, this means that all bitcoins have an age: not the age/time when that bitcoin was first mined, but when it was last used in a transaction. Since … Continue reading Bitcoin Data Science (Pt. 1): HODL Waves