Topic: Post your SegWit questions here - open discussion - big week for Bitcoin! - page 6. (Read 84845 times)

If there is any type of drop, it'll come right down to support and retest highs accordingly. As it has done many times in the past... The news that floats around just gives reasons for inexperienced people to be fearful and speculate that BTC is going to zero.

I just saw that in new transactions there is an option "Fee per weight unit", what this mean?

example : https://blockchain.info/tx/0f65c4bf90414693575266bd8d6521396f8caaed26d0fab3f730a5837dda0900

It says "Fee per weight unit 78.598 sat/WU" and "Weight 900"

with all the drama again. do you tink the btc price might take a 30% dump like last time again? would be a chance to buy back btc . before it moons

is every wallet provider will support this week Segwit? i dont have any update on my wallet.... i use Blockchain and paxful

You can't tell by looking at the transaction output.  Segwit has a specific script format which hashes to match the P2SH value.  So only the owner of the transaction output knows that it is a segwit output (unless you can guess the owner's public key hash and generate the matching P2SH value).  Of course, once the output is spent, you can tell it is a segwith output by looking at the spending input.

There is a BIP for a native segwit address but it hasn't been implemented yet.

My question: How can I know if one transaction is Segwit transaction or not. As far as I know, not all P2SH addresses are segwit addresses.

Most wallets are ready for Segwit, but due to security reason they didn't let you create Segwit wallets until it is activated. Electrum dev said that new version will be released soon letting you do so:
https://github.com/spesmilo/electrum/issues/2791#issuecomment-324340931

With the current version creating segwit addresses is done via command line and that may be only for test net as of 2.6.  So, it is a question of an update.  ( https://github.com/spesmilo/electrum/blob/master/RELEASE-NOTES )

So how do i send a segwit transaction on electrum? 

Replay attacks don't require any hash power, or even any person. Replay can happen accidentally. Replay is that a transaction made on one chain is valid on the other, and becomes confirmed on both chains. The only way to have replay protection is to include it as part of the hard fork.

So I'm reading that this Segwit2X forking could expose BTC users to replay attacks (and maybe to other threats via segwit), but it is not clear at what conditions. To effect replay attacks would take a majority of mining power? Or what exactly?

Thanks cr1776, that's it

I think BIP173 is what you are thinking of:
https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki

As far as when, that is still up in the air.

I think T-Rex means the extra blocksize space

Actual Segwit activation happens at block 481824, according to achow101 above. From there on, people can start using 4MB of blocksize, but only if they're sending to a Segwit address. That will happen before the end of this week, I think around Wednsday or Thursday.

So, you can expect Bitcoin service providing companies (exchanges and larger retailers) to roll out the ability to send to Segwit addresses pretty quick, both to use business2-business and customer-2-business. But regular users need to start using Segwit addresses too, and that takes as long as it takes, no one can force people to do it (the old addresses still work just fine). Miners may begin to incentivise this by prioritising Segwit transactions more, but they already prioritise on the basis of transaction size, so any Segwit incentive would have to be over and above the existing fee per kB logic. All that will take between weeks and months to play out, possibly longer for the last P2PKH addresses to finally move to P2WPKH (the Segwit address/script type).

In addition, there's another BIP out there (171 i think?) that adds a new Segwit specific address format (current practice will be to use Segwit via P2SH addresses). This will be a whole extra new Segwit rollout of sorts. Hopefully, it will be tested and finalised for 0.15.1 (but I'm not at all sure on the specifics, that's just my ideal scenario). This will only add weeks and months to the overall switchover period, but bech32 (the name for the tech behind this new format) has alot of advantages.


Lightning? I expect we can see some test channels running quickly after activation of Segwit, but I think the software clients are still in development even now. Anyone know some more?

You mean to lower fees even more than they already are? 


In recent days I sent about 50 transactions low and high value and I was using between $.10 and $.30 per transaction - and some were quite high transaction amounts...  Some transactions took a bit longer to go through, but they all went through in less than 24 hours.   Really amazing!!!   Sure the higher ones went through in less than an hour, but still.. pretty decent.

As far as getting advantages from segwit activation (for example lighting network) could take several months to see actual advantages, so that will be a curious development to watch, as you mentioned, and surely there are better technical folks that could speculate on these matters.

How long do you guys think it will take before segwit starts having a major effect on the fees?

So when is Lightning Network and all the SegWit upgrades going to be implemented? Will we see atomic swaps with Litecoin or any other cryptocurrencies?

Why is there such a drama about the 2x what was mentioned many year ago, agreed in some tables and seen on roadmaps for long time now?

Why is there people out there risking so much for 'no big deal' thingy?

Is it still the HF fear?

Could we get some 'math' based explanation despite fishy undefined fears?

What is spam
What is enough decentralization
What is security from decentralization
What dynamics we are in and how can we model the future
What is consensus
Why not HF if enough nodes signal upgrade
How is best way to have most on board in future
How is best way getting things done risk free for business with big skin in the game
How get the reputation up for growth

.??

Sure forums looks not the best place but....

I've been in bitcoin for years andI cannot wait for segwit, it allows for so many things.Some miners could explot a potential vulnerability though, could steal money held in segwit format addresses creating a DAO event, could be abused.

For a lot of people they need to back off on the questions it's just going to confuse them a lot. Suffice it to say that a series of security and helper code Snippets were added to the original code. If you want to go beyond that and of course post your questions, but just understand that you might be confusing yourself more than it's worth.