https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-what-is-it 2025-07-25T19:43:38.944107582Z Bitcoin: What is it? Bitcoin is an electronic payment system for online transactions. It's private, open, and decentralized. No central authority controls it, and anyone with internet can use it. Its value comes from people's faith in what they can buy with it. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/4hKCVdhOCCQv8tpk_q6YSgCEgPyM9rd8nyl4E11kDyz9cjvZVqn91BR0fc5CarQYmVPCqu7JwE3LRA4nBTXIPbkawQ Bitcoin: What is it? Bitcoin is an electronic payment system for online transactions. It's private, open, and decentralized. No central authority controls it, and anyone with internet can use it. Its value comes from people's faith in what they can buy with it. https://cdn.kastatic.org/ka-youtube-converted/EA0LkCkvUeU.mp4/EA0LkCkvUeU.mp4 548 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-overview 2020-06-23T07:22:42Z Bitcoin: Overview An introduction to the mechanics of bitcoins and an overview of how transactions take place. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/srxlibpnt8q1XlOwJ5no38K1IR94QjvWHKGz_ohK0p9GFRtI_QpWfr3Z6dDxh6hXZ4b4PYS5oiFQcwJ9xMR52lVu Bitcoin: Overview An introduction to the mechanics of bitcoins and an overview of how transactions take place. https://cdn.kastatic.org/ka-youtube-converted/Y-w7SnQWwVA.mp4/Y-w7SnQWwVA.mp4 662 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-cryptographic-hash-function 2020-06-23T07:22:41Z Bitcoin: Cryptographic hash functions What cryptographic hash functions are and what properties are desired of them. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/FRL2JPdMkOIVriB1xviIDNCXenPTnZbmOiDBnFTwMtKFczikXwD2OGB4Hra7e-lWOHg2NpAJosRsZlypJNQ-250WOQ Bitcoin: Cryptographic hash functions What cryptographic hash functions are and what properties are desired of them. https://cdn.kastatic.org/ka-youtube-converted/0WiTaBI82Mc.mp4/0WiTaBI82Mc.mp4 614 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-digital-signatures 2020-06-23T07:22:40Z Bitcoin: Digital signatures A high-level explanation of digital signature schemes, which are a fundamental building block in many cryptographic protocols. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/d_9fto_RPJDxFpFy_lwB_Rqhsar9-5g6Yy1eF_i5Jk9mkeVVJ8eAYZqdYWi0jHkILCRa7KMiO_16kwyX6HLoz6q6Fw Bitcoin: Digital signatures A high-level explanation of digital signature schemes, which are a fundamental building block in many cryptographic protocols. https://cdn.kastatic.org/ka-youtube-converted/Aq3a-_O2NcI.mp4/Aq3a-_O2NcI.mp4 588 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-transaction-records 2020-06-23T07:22:42Z Bitcoin: Transaction records The basic mechanics of a bitcoin transaction between two parties and what is included within a given bitcoin transaction record. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/XyrvPEe3zAqKCTtggrbJTFqZAnOCQ-jU1IoKDSKejyDCEoQB2LT0lPVseE23KdGP-opN6ne97XnqiJJUOcFNh92j Bitcoin: Transaction records The basic mechanics of a bitcoin transaction between two parties and what is included within a given bitcoin transaction record. https://cdn.kastatic.org/ka-youtube-converted/9-9_v1wSPBQ.mp4/9-9_v1wSPBQ.mp4 692 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-proof-of-work 2020-06-23T07:22:42Z Bitcoin: Proof of work An explanation of cryptographic proof-of-work protocols, which are used in various cryptographic applications and in bitcoin mining. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/4Ea4FhKb5vy-BbqsYtb0ctKeIS42DWlvduJTYyuMMOHRzl6fIF_lcRWlCvh_xfw3R756cQ43F7bdFlOeLXXatKE Bitcoin: Proof of work An explanation of cryptographic proof-of-work protocols, which are used in various cryptographic applications and in bitcoin mining. https://cdn.kastatic.org/ka-youtube-converted/9V1bipPkCTU.mp4/9V1bipPkCTU.mp4 632 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-transaction-block-chains 2020-06-23T07:22:42Z Bitcoin: Transaction block chains The mechanics of a bitcoin transaction block chain, which is a construct that is generated by bitcoin miners and functions as a global ledger for recording and validating bitcoins. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/YjxwqemR1uhVQE0zAnzwn-Qf27zf0KjZHKsB3E2um2ZSL-z0WBE5FiDAiPP1_0_tiXyWxQ6hqerkWkGMAArlL-XNng Bitcoin: Transaction block chains The mechanics of a bitcoin transaction block chain, which is a construct that is generated by bitcoin miners and functions as a global ledger for recording and validating bitcoins. https://cdn.kastatic.org/ka-youtube-converted/QzDO44oZWtE.mp4/QzDO44oZWtE.mp4 685 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-the-money-supply 2020-06-23T07:22:43Z Bitcoin: The money supply The mechanisms by which the supply of bitcoins is controlled. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/xC4bgJ02tM8nI8Mad4O427ZcyP6dUmqlwrOzxp-MGFBQR2vt7HeSJl98lX0n_0Wf_s8h-0Ovh7cygxe6AI1EADQ Bitcoin: The money supply The mechanisms by which the supply of bitcoins is controlled. https://cdn.kastatic.org/ka-youtube-converted/JuWYLAtz3Y4.mp4/JuWYLAtz3Y4.mp4 734 Bitcoin blockchain technology https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-security-of-transaction-block-chains 2020-06-23T07:22:40Z Bitcoin: The security of transaction block chains A detailed explanation of what makes bitcoin transaction block chains secure. Zulfikar Ramzan video https://cdn.kastatic.org/googleusercontent/a4CMynlS4gJpIwHEX7y_aCvEWYYVQo7qD6THh9MgZbCdP4KaRIhjixn5FiVH_GmUrtS1a-jDHcb3RkcGztf31CQiVg Bitcoin: The security of transaction block chains A detailed explanation of what makes bitcoin transaction block chains secure. https://cdn.kastatic.org/ka-youtube-converted/8zgvzmKZ5vo.mp4/8zgvzmKZ5vo.mp4 916 Bitcoin blockchain technology