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SegWit signing algorithm and its improvement

I was reading about Segregated Witness upgrade from the book Mastering Bitcoin by Andreas and there were some questions I have not figured out. I am appreciated to get some of your help!

A) There was a passage of the book talking about SegWit helps reduce the complexity of the signing algorithm.

Segregated Witness upgrades the signature functions (CHECKSIG, CHECKMULTISIG, etc.) to reduce the algorithm’s computational complexity. Before segwit, the algorithm used to produce a signature required a number of hash operations that was proportional to the size of the transaction. Data-hashing computations increased in O(n^2) with respect to the number of signature operations, introducing a substantial computational burden on all nodes verifying the signature. With segwit, the algorithm is changed to reduce the complexity to O(n).

What is the original algorithm here whose complexity is O(n^2) (is it ECDSA or something else)? And also what is the new SegWit signing algorithm, and how it got the complexity of O(n)?

B) There was also a passage talking about SegWit improvement.

Segregated Witness signatures incorporate the value (amount) referenced by each input in the hash that is signed. Previously, an offline signing device, such as a hardware wallet, would have to verify the amount of each input before signing a transaction. This was usually accomplished by streaming a large amount of data about the previous transactions referenced as inputs. Since the amount is now part of the commitment hash that is signed, an offline device does not need the previous transactions. If the amounts do not match (are misrepresented by a compromised online system), the signature will be invalid

What does it mean by saying Segregated Witness signatures incorporate the value (amount) referenced by each input in the hash that is signed. and Since the amount is now part of the commitment hash that is signed, an offline device does not need the previous transactions.? Does it mean that in Legacy block, the variable transfer value is not included in the hash, and now SegWit includes it?
And I cant understand how this make offline device not to need previous transactions’ info (although I do understand that every offline devices need previous utxo to sign a transaction)

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Dogecoin could rally by at least 40% this week

Dogecoin has reported a strong rally over the past 7 days. The coin is up by around 20%. It is also the best performing coin among the top 10 most valuable cryptocurrencies. Despite this, DOGE has reached an important transition point. How the coin performs from here on will determine how far the recent uptrend::Listen

Dogecoin has reported a strong rally over the past 7 days. The coin is up by around 20%. It is also the best performing coin among the top 10 most valuable cryptocurrencies. Despite this, DOGE has reached an important transition point. How the coin performs from here on will determine how far the recent uptrend will go. More on this below but first, here are some highlights:

  • DOGE is testing its 35-day EMA resistance of around $0.0735.

  • The coin is aiming to reclaim the $0.082 support in the coming days.

  • If that happens, DOGE could swing further by at least 33%.

Data Source: TradingView 

Dogecoin Price analysis and prediction

The past week has been quite good for DOGE. After a 20% surge, the coin has managed to cruise past several resistance zones. For now, DOGE is testing the crucial 35-day EMA of $0.0735. The meme coin is currently consolidating above $0.07 despite tumbling by 65 over the last 24 hours.

Once this consolidation phase is over, DOGE will try to test the $0.082 resistance zone. In fact, the token needs only a 10% surge from its current price to flip $0.082 from resistance to support. When this happens, DOGE will likely generate lots of demand. This will push it further up to $0.1 before it pulls back. It will be an upswing of around 40% from the current price.

So far, it seems DOGE has enough momentum to play out this setup. However, if somehow the meme coin falls below $0.68 today, this thesis becomes invalid. We don’t think this will happen.

How to profit from DOGE in the short-term

The most crucial price point to watch is obviously $0.082. Once this mark is flipped from resistance to support, buy in and ride the wave towards $0.1. 

Also, as broader sentiment in the market improves, we don’t think there is a significant downside risk for DOGE unless it falls below $0.068.

The post Dogecoin could rally by at least 40% this week appeared first on CoinJournal.

SegWit signing algorithm and its improvement

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