What is Segregated Witness (SegWit)? How do you know you’re using SegWit? SegWit fixes transaction malleability and enables further upgrades towards Bitcoin smart contracts. Can transaction malleability lead to denial-of-service (DoS) attacks? Does SegWit put witness data in a different block? Did SegWit change transaction validation? versus? Are there any security risks of invalid blocks?

CORRECTION: At ~2:07, I stated the incorrect BIP number for the Bech32 address format, which should be BIP173. BIP176 is about “bits” denomination. https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki

More on SegWit: https://bitcoincore.org/en/2016/01/26/segwit-benefits/

These questions are from the MOOC 9.3 and 9.5 sessions which took place on March 2nd and March 16th, 2018 respectively. Andreas is a teaching fellow with the University of Nicosia. The first course in their Master of Science in Digital Currency degree, DFIN-511: Introduction to Digital Currencies, is offered for free as an open enrollment MOOC course to anyone interested in learning about the fundamental principles.

If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop

The Lightning Network – https://www.youtube.com/playlist?list=PLPQwGV1aLnTurL4wU_y3jOhBi9rrpsYyi
SegWit adoption – https://youtu.be/KCsTVTRk6I4
Advanced Bitcoin Scripting Part 1: Transactions and Multi-sig – https://youtu.be/8FeAXjkmDcQ
Advanced Bitcoin Scripting Part 2: SegWit, Consensus, and Trustware – https://youtu.be/pQbeBduVQ4I
How do I choose a wallet? – https://youtu.be/tN6b62sEpsY
Hot vs. cold wallets – https://youtu.be/Aji_E9sw0AE
SegWit adoption – https://youtu.be/KCsTVTRk6I4
Secure, tiered storage system – https://youtu.be/uYIVuZgN95M
Decentralised exchanges and counterparty risk – https://youtu.be/hi_jaw0dT9M
Decentralised exchanges with fiat – https://youtu.be/3Url8tbQEkA
How do I secure my bitcoin? – https://youtu.be/vt-zXEsJ61U
How do mnemonic seeds work? – https://youtu.be/wWCIQFNf_8g
HODLing and the “get free” scheme – https://youtu.be/MhOwmsW1YNI
How to get people to care about security – https://youtu.be/Ji1lS9NMz1E
Bitcoin as everyday currency – https://youtu.be/xYvvSV4mjH0
Irreversibility and consumer protection – https://youtu.be/R107YWu5XzU
Hyperbitcoinization – https://youtu.be/AB5MU5fXKfo
Job opportunities with cryptocurrencies – https://youtu.be/89_p4pDlQtI
How long until mainstream adoption? – https://youtu.be/y3cKBDBabtA
What is the biggest adoption hurdle? – https://youtu.be/jHgyHF3F2TI

Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin.

Follow on Twitter: @aantonop https://twitter.com/aantonop
Website: https://antonopoulos.com/

He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters.

THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8

[NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8

MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042

[NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388

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