The Blockchain and Cryptocurrency

A blockchain is a distributed database that is used to maintain a continuously growing list of records, called blocks. Each block contains a timestamp and a link to a previous block. A blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks. By design, blockchains are inherently resistant to modification of the data. Once recorded, the data in any given block cannot be altered retroactively without the alteration of all subsequent blocks and a collusion of the network majority. Functionally, a blockchain can serve as "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. The ledger itself can also be programmed to trigger transactions automatically.

History.com: America's War On Drugs

America’s War on Drugs
http://www.history.com/shows/americas-war-on-drugs/about:

“America’s War on Drugs” is an immersive trip through the last five decades, uncovering how the CIA, obsessed with keeping America safe in the fight against communism, allied itself with the mafia and foreign drug traffickers. In exchange for support against foreign enemies, the groups were allowed to grow their drug trade in the United States. The series explores the unintended consequences of when gangsters, war lords, spies, outlaw entrepreneurs, street gangs and politicians vie for power and control of the global black market for narcotics – all told through the firsthand accounts of former CIA and DEA officers, major drug traffickers, gang members, noted experts and insiders.

Episode 1: Acid, Spies & Secret Experiments
Episode 2: Cocaine, Cartels, & Crack Downs
Episode 3: Gangs Prisons, and Meth Queens
Episode 4: Heroin, Terrorists, and Kings of Pain