Bitcoin Q&A: Block Capacity and Embedded Data

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Original video published date: 2018-08-01
Original video description: How many transactions can fit in a block, with or without SegWit? What other types of data can you put in a block? What is metadata? What is OP_RETURN? What is OpenTimestamps and what are the use cases?

More on OP_RETURN - https://en.bitcoin.it/wiki/OP_RETURN
Check out OpenTimestamps here: https://opentimestamps.org/

Chapters
0:00 What can you put on the Bitcoin blockchain? How many transactions can fit in a block, with and without SegWit?
1:47 What kind of other data can you include in a block?
3:38 What exactly is meant with 'metadata'? Are metadata visible and useful?
4:10 How could I upload a hash of a document in an OP_RETURN field myself? Is there a special command on Bitcoin Core which allows me to do so?
5:15 Could I upload any text I want on the Bitcoin blockchain, as long as it's less than 80 bytes? Could Ethereum be used more efficiently for storing hashes of documents instead of Bitcoin? Why?
6:53 Can a block with hashed data stored in OP_RETURN, such as an academic certificate, also have regular mine-able transactions and therefore be treated just like any other block?


These questions are from MOOC 9.6 and the June monthly Patreon sessions, which took place on March 23rd and June 24th 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

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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 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-co...

[NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andr...

MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin...

[NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-P...

Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-m...

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Original video link:    • Bitcoin Q&A: Block Capacity and Embedded Data