Hashop Bitcoin and Altcoin Mining Coin Pursuit

08-09 16:33 - 'Banned from r/btc .. I thought they were anti censorship ?' (i.redd.it) by /u/hashop removed from /r/Bitcoin within 157-167min

Banned from btc .. I thought they were anti censorship ?
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Author: hashop
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BIP 199 HTLC initial stack state

Hey fellow bitcoiners and redditors

I'm trying to understand how HTLCs (Hashed Time-Locked Contracts) can be implemented in Bitcoin and BIP-199 turned out to be the best resource for that purpose.

TL;DR
Question answered!
  1. Does the stack need to feature the secret/image twice in the OP_IF case? => call the script with [pubKey, signature, 1]
  2. How can the OP_ELSE flow ever be executed successfully (since this requires the stack to be empty, but [pubKey, signature] are required for OP_CHECKSIG at the very end of the script )? => call the script with [pubKey, signature, 0]

Full story
This is the example HTLC script I copied from BIP-199:
OP_IF
[HASHOP] OP_EQUALVERIFY OP_DUP OP_HASH160
OP_ELSE
[TIMEOUTOP] OP_DROP OP_DUP OP_HASH160
OP_ENDIF
OP_EQUALVERIFY
OP_CHECKSIG

IF-Case (seller can claim the buyers deposited BTCs)
TL;DR: detailed debug log of this path. Question: Can I avoid providing the preimage twice?

Before running this script, the preimage should be known and the stack should looks:
preimage
preimage
pubKey
signature

  • So since the stack is not empty, it will jump into the OP_IF clause.
    • the OP_IF will pop the top value => stack is now: [preimage, pubKey, signature]
  • [HASHOP] will hash the preimage
    • the preimage on the stack will, be replaced by the image => stack: [image, pubKey, signature]
  • digest (a synonym for image) will be pushed
    • => stack: [image, image pubKey, signature]
  • OP_EQUALVERIFY checks the two top items for equality: image == image => true
    • ...and removes them, if they are equal => stack: [pubKey, signature]
  • OP_DUP will duplicate the pubKey, => stack: [pubKey, pubKey, signature]
  • OP_HASH160 will double-hash the pubKey => stack: [p2pkhAddress, pubKey, signature]
  • represents the p2pkhAddress => stack: [p2pkhAddress, p2pkhAddress, pubKey, signature]
  • OP_EQUALVERIFY checks the two top items for equality: p2pkhAddress == p2pkhAddress => true
    • ...and removes them, if they are equal => stack: [pubKey, signature]
  • OP_CHECKSIG checks the signature
  • Done, all fine!
  • Question: This flow requires the secret to be on the stack twice before starting the script; Can I avoid that somehow?

ELSE-Case (buyer claims refund of his/her deposited BTCs)
Since the script runs an OP_CHECKSIG at the very end. This means the stack has to contain at least [pubKey, signature] before the execution pointer moves to OP_IF. However, OP_IF returns true "If the top stack value is not False". So how can the script possibly ever execute the OP_ELSE flow?

Disclaimer
  • My mother tongue is not English, please forgive me any mistakes. :)
  • I'm just getting started with BTC scripting, please forgive me any noob mistakes.
  • I also searched the whole stackexchange/search engine/reddit/github universum for this issue, obivously without success.
PS - buy Bitcoin :)
submitted by redditeraya to Bitcoin [link] [comments]

Detailed crypto background check on u/hashop

Of u/hashop's last 619 posts (3 submissions + 616 comments), I found 536 in cryptocurrency-related subreddits. This all the data I found:
Subreddit No. of comments Avg. comment sentiment Total comment karma No. of posts Avg. post sentiment Total post karma
BitcoinAUS 12 0.2 28 0 0.0 0
litecoin 19 0.06 84 0 0.0 0
eos 5 0.14 5 0 0.0 0
nanocurrency 3 0.0 0 0 0.0 0
Bitcoin 39 0.07 154 0 0.0 0
Stellar 3 0.16 6 0 0.0 0
ethereum 6 -0.04 6 0 0.0 0
ethtrader 11 -0.01 19 0 0.0 0
btc 421 0.05 -281 2 0.0 14
CryptoCurrency 15 -0.02 15 0 0.0 0
submitted by cryptochecker to cryptochecker [link] [comments]

BIP draft: HTLC transactions | Sean Bowe | Jul 20 2016

Sean Bowe on Jul 20 2016:
I'm requesting feedback for Hash Time-Locked Contract (HTLC) transactions
in Bitcoin.
HTLC transactions allow you to pay for the preimage of a hash. CSV/CLTV can
be used to recover your funds if the other party is not cooperative. These
scripts take the following general form:
[HASHOP] OP_EQUAL OP_IF OP_ELSE [TIMEOUTOP] OP_DROP OP_ENDIF OP_CHECKSIG 
These transactions are useful for both the Lightning network and in
zero-knowledge contingent payments. This very script (using CLTV and
SHA256) was used as part of our "pay-to-sudoku" ZKCP demo earlier this
year: https://github.com/zcash/pay-to-sudoku
Members of the community have expressed the desire for a BIP to submitted
in coordination with changes to Bitcoin Core that support these
transactions in the wallet.
Please review my draft BIP here:
https://gist.github.com/ebfull/8306903041d46e4119a39442f72a3741
An implementation is being worked on here:
https://github.com/bitcoin/bitcoin/pull/7601
Thanks!
Sean Bowe
Zcash
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Looking forward to seeing what you brilliant designers will come up with.
Thanks for looking.
submitted by lonsirus to Jobs4Bitcoins [link] [comments]

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