Bitcoin Q&A: What is Segregated Witness?
30.2 هزار بار بازدید -
7 سال پیش
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What is Segregated Witness (SegWit)?
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/...
More on SegWit: https://bitcoincore.org/en/2016/01/26...
Chapters
0:00 What is Segregated Witness (SegWit)?
3:06 How would you know that you are using Segregated Witness?
5:20 What type of malleability and scalability issues can Bitcoin present without using Segregated Witness?
7:17 Why is nobody exploiting the malleability bug in Bitcoin or Bitcoin Cash, if you can interject a change with the signatures, pay a higher fee, and broadcast it again?
8:22 If we are making two different blocks, a transaction and witness block, are they still the same size?
9:28 How is the witness part included in add-on blocks and verified in the coinbase transaction?
10:53 SegWit security. Are there any concerns about the potential increase in the number of invalid blocks propagated, if not enough people are storing the unhashed signature data on their nodes?
11:59 If I don't store signature data on my node, could I not verify previous transactions? If that is the case, should large transactions remain off SegWit or the Lightning Network, insofar as you not personally storing signature data?
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: Patreon: aantonop
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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 Twitter: 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-Mon...
[NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money...
MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bi...
[NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitc...
Subscribe to the channel to learn more about Bitcoin & open blockchains!
Music: "Unbounded" by Orfan (Facebook: Orfan)
Outro Graphics: Phneep (http://www.phneep.com/)
Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Join the aantonop Channel: https://aantonop.io/joinaantonopyt
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/...
More on SegWit: https://bitcoincore.org/en/2016/01/26...
Chapters
0:00 What is Segregated Witness (SegWit)?
3:06 How would you know that you are using Segregated Witness?
5:20 What type of malleability and scalability issues can Bitcoin present without using Segregated Witness?
7:17 Why is nobody exploiting the malleability bug in Bitcoin or Bitcoin Cash, if you can interject a change with the signatures, pay a higher fee, and broadcast it again?
8:22 If we are making two different blocks, a transaction and witness block, are they still the same size?
9:28 How is the witness part included in add-on blocks and verified in the coinbase transaction?
10:53 SegWit security. Are there any concerns about the potential increase in the number of invalid blocks propagated, if not enough people are storing the unhashed signature data on their nodes?
11:59 If I don't store signature data on my node, could I not verify previous transactions? If that is the case, should large transactions remain off SegWit or the Lightning Network, insofar as you not personally storing signature data?
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: Patreon: aantonop
RELATED:
The Lightning Network - The Lightning Network
SegWit adoption - Bitcoin Q&A: SegWit Adoption
Advanced Bitcoin Scripting Part 1: Transactions and Multi-sig - Advanced Bitcoin Scripting -- Part 1:...
Advanced Bitcoin Scripting Part 2: SegWit, Consensus, and Trustware - Advanced Bitcoin Scripting -- Part 2:...
How do I choose a wallet? - Bitcoin Q&A: How Do I Choose a Wallet?
Hot vs. cold wallets - Bitcoin Q&A: Hot vs. Cold Wallets
SegWit adoption - Bitcoin Q&A: SegWit Adoption
Secure, tiered storage system - Bitcoin Q&A: Secure, Tiered Storage S...
Decentralised exchanges and counterparty risk - Bitcoin Q&A: Decentralised Exchanges ...
Decentralised exchanges with fiat - Bitcoin Q&A: Decentralised Exchanges ...
How do I secure my bitcoin? - Bitcoin Q&A: How Do I Secure My Bitcoin?
How do mnemonic seeds work? - Bitcoin Q&A: How Do Mnemonic Seeds Work?
HODLing and the "get free" scheme - Bitcoin Q&A: HODLing and the "Get Fre...
How to get people to care about security - Bitcoin Q&A: How to Get People to Car...
Bitcoin as everyday currency - Bitcoin Q&A: Bitcoin as Everyday Curr...
Irreversibility and consumer protection - Bitcoin Q&A: Irreversibility and Cons...
Hyperbitcoinization - Bitcoin Q&A: Hyperbitcoinization
Job opportunities with cryptocurrencies - Bitcoin Q&A: Job Opportunities with C...
How long until mainstream adoption? - Bitcoin Q&A: How Long Until Mainstrea...
What is the biggest adoption hurdle? - Bitcoin Q&A: What is the Biggest Adop...
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 Twitter: 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-Mon...
[NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money...
MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bi...
[NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitc...
Subscribe to the channel to learn more about Bitcoin & open blockchains!
Music: "Unbounded" by Orfan (Facebook: Orfan)
Outro Graphics: Phneep (http://www.phneep.com/)
Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Join the aantonop Channel: https://aantonop.io/joinaantonopyt
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