#bitcoin

As a bald, hairy man, I should probably shampoo my body and use body wash soap on my head. -BrandonThe, Dec 2015

Been here two years, most clients haven’t even mastered the first part yet.

{"id":"d056cbaf6f7421ed261bc5eb1bd0437e103a9713b53787789f6dada555190161","pubkey":"cbc5ef6b01cbd1ffa2cb95a954f04c385a936c1a86e1bb9ccdf2cf0f4ebeaccb","created_at":1728285973,"kind":1,"tags":[["p","66c292bee0a69c221aebd2f288ffe1efaa3163217161c9539337e2b0dd55136a"],["r","https://delvingbitcoin.org/t/draft-bip-for-op-txhash-and-op-checktxhashverify/121"],["r","https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-May/020450.html"],["r","https://github.com/bitcoin/bips/blob/master/bip-0119.mediawiki"]],"content":"in the last post we talked about how we need introspection to make more restrictive statements about where bitcoin is allowed to be spent. for example, to only let the bitcoin be spent in a transaction that pays nifty 500k of the sats.\n\nhow do we make introspection happen in bitcoin scripts? there’s a couple of proposals, each one a bit more involved than the last. we’ll start with the simplest proposal, and work our way to the most complex.\n\nthe simplest is probably the least well known: op-tx. this opcode will take a flagset as its input. the flagset “flags” which parts of the tx should be added onto the stack. the interpreter will look at the flags, find that data in the tx, and then pull it in by putting it on the stack.\n\nonce the data is pushed onto the stack, you can make assertions about that data. for example, you could flag to op-tx to push the first output amount and script onto the stack. this would then let you check that the tx is sending at least 500k sats to nifty’s address.\n\nop-tx is very simple, but powerful. there’s open questions about how to design the flags that refer to different parts of a transaction, as well as how expensive it can be to do operations on the data. could you maybe make a script that has too long of a run time because of having access to so much transaction data? there’s also issues with limited amounts of data being allowed onto the stack, which you might run into if the tx info is too big.\n\nto try to alleviate concerns about access to too much data, op-txhash has been proposed.\n\ntxhash works similarly, in that it lets you define a flagset which points to different parts of the transaction. instead of pushing the data directly onto the stack, however, it instead hashes the data and pushes the resulting *hash* onto the stack.\n\nso if i wanted to check that the first output of the transaction paid me 500k sats, i’d have to figure out the hash of that when writing the locking script. i’d then use op-txhash to push the hash of the first output onto the stack, and them compare that to the one i calculated when i first locked the coins up. instead of looking at data directly, we’re looking at hashes of data.\n\nthere are some downsides to using hashes. for example, this makes it impossible to do comparisons like “at least” 500k sats sent to nifty. you’d have to only accept txs that send exactly 500k sats.\n\nusing hashes has definite upsides though. you can verify a lot more information in a single check. for example instead of checking the amount and address separately, you’d check a single hash value that compares them both. this also saves space, and reduces the number of checks that need to be done.\n\nwhich brings us to op-ctv. op-ctv is an opinionated version of op-txhash. instead of allowing you to choose what set of fields from a tx you want to hash and check against, it picks a fixed set of data from the tx that goes into the hash. this means you need a better understanding of exactly what the tx your bitcoin will be spent in to use ctv. you can’t just compare the first output’s hash, for example.\n\nop-ctv stands for “check template verify”; the “template” in this case is the fixed set of fields in a tx that will be hashed together.\n\none downside to using op-ctv is that you can’t change the amounts or outputs in the spending tx, which makes it more difficult to add fees later to ensure the tx can be mined.\n\nok that’s a good stopping point for the “simple” hash and direct access proposals for introspection opcodes in bitcoin scripting.\n\nin the next post we’ll look at the craziest way that introspection can be added to bitcoin: op-cat 🐱 \n\nenjoying this series about covenant proposals? learn more about how txs work with nostr:npub1vmpf90hq56wzyxht6teg3llpa74rzcepw9suj5unxl3tph24zd4qgtxhm7 online classes 👌 \n\n\nRead more about TXHASH and how it relates to CTV/TX here: https://delvingbitcoin.org/t/draft-bip-for-op-txhash-and-op-checktxhashverify/121\n\nOriginal proposal for op-tx is here: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-May/020450.html\n\nOp-ctv you can find out more about on the Bip119: https://github.com/bitcoin/bips/blob/master/bip-0119.mediawiki","sig":"4cbdb719a23445eb2637f42f70b6710c7136eb3082bdd9d9356013dabd15ebbc6d2872ba426394e3ae4a63228c3516c5447981e42147c265827f7a7399db4208"}

Listening to episode again and zapping via WhatsApp Wallet is nostr:npub1nv4j840c5ugjjq7ym3sqkz5jcschjx8ulnaa90645av0rwdylm9qv9x0gr by the amazing nostr:npub1773r2y5zl3sa7xufmye96un3hf02rse8j82hkd45ps0wvk2hrkasslesjt #bitcoin https://fountain.fm/episode/3RZfos1Qh6BW4tyQust8 https://video.nostr.build/4ae0c0271436e83da81a27518a56f645068c0f2d9e4b397633778ab2afacdee8.mp4

Listening to episode again and zapping via WhatsApp Wallet is nostr:npub1nv4j840c5ugjjq7ym3sqkz5jcschjx8ulnaa90645av0rwdylm9qv9x0gr by the amazing nostr:npub1773r2y5zl3sa7xufmye96un3hf02rse8j82hkd45ps0wvk2hrkasslesjt #bitcoin https://fountain.fm/episode/3RZfos1Qh6BW4tyQust8 https://video.nostr.build/4ae0c0271436e83da81a27518a56f645068c0f2d9e4b397633778ab2afacdee8.mp4

🔥

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nostr:npub1fnn2h0tgm2mwnl0kar5ez25wztum2w0q0rrrf326n0ljn999znwsqf4xnx your music has impact. I have to share this story. I met nostr:npub1y7lu0h04p2ls4qjfc4auurdukg2fsrxppspamd53lv0efjmuhrgsklqs2u at our local Meetup here in Geneva, Switzerland 🇨🇭 He listened to your episode of the podcast and subsequently messaged nostr:npub1awyzkzaktxlhyg6syzst3pxy5lvp0c908yphz4ekk9rp3zcapp5qxn79n4 saying he should play DCA2BTC on his show. I didn’t know. I listened to (& boosted) the episode (called ‘Buy the invasion’), and was pleasantly surprised at the end when your song played. I thought it was a coincidence. This morning when I opened Telegram, I saw Jinformatique’s message and was floored. DCA2BTC is transcending borders, cultures, and language 🔥 https://image.nostr.build/bfa4939552ec4f111bd199f4994c250b6875d14c3547cdb34b23e31fa5401132.jpg

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This nostr:nevent1qqsxc8lnt0znz403leara5xs9ktfgt05k0ac2mqc6n2qemkh6p0wr9qp3rt9p

That might be possible, how would you envision this be show on the site? Some mark on each post?

The Many Colors Of #Cypriot #Sunsets This is #Cyprus 🇨🇾 #sunset #photography #photostr

Could you please clean the site cache on mobile? Does the problem go away?

its weird to me how many people dont know how to use a forward slash to search for a specific topic in man pages.

its weird to me how many people dont know how to use a forward slash to search for a specific topic in man pages.

Wow, so many prominent people on Nostr are leftists hating on Elon. I thought you guys were supposed to be smart with all your protocols and censorship resistance. But everyone seems to be Jack Dorseys lovers!! I mean Jack Dorsey!! The poster boy for censorship!!! And you’re hating on Elon?? Give me a fucking break 🤣🤣 #Nostr #grownostr #GM #freedom #bitcoin

Hi this is possible on theme level but will require significant customizations, unfortunately we can't prioritise that atm

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Women are the original 3D printers. -Kandiu09, Sep 2014

nostr:npub1v5ufyh4lkeslgxxcclg8f0hzazhaw7rsrhvfquxzm2fk64c72hps45n0v5 my first bitcoin themed track… 🫂🇹🇿🤙🏾 #DCA2BTC https://fountain.fm/track/TR6ZQj36qSLB3oe2TDWW

Nostr needs better leadership. #Nostr #grownostr #GM #freedom #bitcoin

gm ☕🔆💜🌹🤙 #bitcoin #btc #satoshi #stacksats #pv #nostr #nostriches #plebs #plebchain

I use magic wormhole to move files and text strings between computers. https://fountain.fm/episode/xmBMa3xSFDm588xdhhFG nostr:nevent1qvzqqqpxquqzqa8rhxh8ueff3stmnhzv64awsvjead7n9lxpe2jwj6eu0yffc6dkppj0dt

😂