# Citations
The following list is composed of the sources we used to build this
chapter. We deem these sources credible. Reference style is APA.
* Antonopoulos, A. M. (2014). Mastering Bitcoin: Unlocking Digital Cryptocurrencies (1st ed.). O’Reilly Media.
* 손. (2021, December 9). Bitcoin#6: Target and Difficulty - 손동하. Medium. Retrieved January 9, 2022, from https://medium.com/@dongha.sohn/bitcoin-6-target-and-difficulty-ee3bc9cc5962
* Curran, B. (2018, July 23). Comparing Bitcoin & Ethereum: Utxo vs account based transaction models. Blockonomi. Retrieved January 16, 2022, from https://blockonomi.com/utxo-vs-account-based-transaction-models/ 
* Alberto. (2022, January 7). What is bitcoin script? Bit2Me Academy. Retrieved January 16, 2022, from https://academy.bit2me.com/en/what-is-bitcoin-script/#:~:text=Bitcoin%20Script%20is%20the%20language,that%20we%20will%20know%20next. 
* Gr0ckchain, G. K. (2020, July 22). Bitcoin script 101. Bitcoin Developer Network. Retrieved January 16, 2022, from https://bitcoindev.network/bitcoin-script-101/
* Nakamoto, S. (2008, October). Bitcoin: A Peer-to-Peer Electronic Cash System. Satoshi Nakamoto. https://bitcoin.org/bitcoin.pdf
* Crypto Wallets: Custodial vs. Non-Custodial Wallets. (2021, May 6). Gemini. Retrieved January 16, 2022, from https://www.gemini.com/cryptopedia/crypto-wallets-custodial-vs-noncustodial
* Bitcoin Block Reward Halving Countdown. (n.d.). Bitcoin Block Half. Retrieved January 16, 2022, from https://www.bitcoinblockhalf.com/
* Wiesflecker, L. (2021, December 24). How many bitcoin are lost forever? - The Capital. Medium. Retrieved January 16, 2022, from https://medium.com/the-capital/how-many-bitcoin-are-lost-forever-34f2b48a6dba
* Ross, M. C. (2018, August 11). Why increasing bitcoin dominance is no good thing. - M.C. Ross. Medium. Retrieved January 16, 2022, from https://medium.com/@MC_Ross1001/why-increasing-bitcoin-dominance-is-no-good-thing-7a21a6f9110e
* L., K. (2021, December 7). The Blockchain Scalability Problem & the Race for Visa-Like Transaction Speed. Medium. Retrieved January 16, 2022, from https://towardsdatascience.com/the-blockchain-scalability-problem-the-race-for-visa-like-transaction-speed-5cce48f9d44#:%7E:text=Bitcoin%20processes%204.6%20transactions%20per,150%20million%20transactions%20per%20day
* Champagne, P. (2014). The Book of Satoshi: The Collected Writings of Bitcoin Creator Satoshi Nakamoto. e53 Publishing LLC.
* Bit2Me Academy, B. M. (2022, January 7). History of bitcoin exchanges and trading. Bit2Me Academy. Retrieved January 16, 2022, from https://academy.bit2me.com/en/history-exchanges-bitcoin-trading/
* Maitra, R. (2021, December 14). What The Heck is UTXO - BitHyve. Medium. Retrieved January 18, 2022, from https://medium.com/bitbees/what-the-heck-is-utxo-ca68f2651819#:%7E:text=The%20collection%20of%20all%20the,is%20accepted%20in%20the%20blockchain.