wallet – Segwit Bitcoin Transaction Signing

As I could understand, we can retrieve the R and S values ​​of any transaction that follows the ScriptSig where we have DER serialization.

  1. The segwit transactions, where the signature will be in the witness section, recovering R and S follow the same steps?
  2. If I use the compressed public key (starting with 0x02 or 0x03), how can I verify the signature, since I don't have the Y coordinate of the public key?
  3. For transactions of multiple signatures that use P2SH, as I understand it, we must sign with the first key, then obtain the exit transaction with the first signature and sign it with the other key, but using the signature math we use the hash of the message that is the txId, but in segwit the txid will not change after signing since the witness does not count as part of the hash for txid?

Anything else you should look at when signing a transaction?

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Authentication: I am signing outgoing webhooks (HMAC) to allow users to verify their source, should I also sign outgoing responses?

To allow API users to verify the authenticity of outgoing webhooks, I am using a model similar to Slack:

  • Concatenate timestamp and body, HMAC with pre-shared key, add timestamp and HMAC summary to headers.

  • The recipient does the same and compares to the summary in the header.

I can implement this exclusively on outgoing webhooks, or I can implement it as middleware that performs this process on both outgoing webhooks and in response to requests.

Is this last good practice? A good idea?

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signature: what is included in the tx hash preimage when signing with 0x83 (SINGLE | ANYONECANPAY)?

I have a script to create a P2WPKH transaction to P2WPKH (1 entry, 1 exit) and sign it with the sighash type 0x01 SIGHASH_ALL.

What fields would you need to change in the tx summary preimage to convert the signature to one with a sighash type of 0x83 (SINGLE | ANYONECANPAY)? I'm having trouble understanding the documentation in bip_143.

As a reference, the preimage of tx digest:

SHA256 serialization double of:
1. nVersion version (4 small bytes endian)
2. hashPrevouts (32 byte hash)
3. hash sequence (32 byte hash)
4. outpoint (32 byte hash + 4 byte little endian)
5. input scriptCode (serialized as scripts within CTxOuts)
6. value of the output spent by this input (little endian of 8 bytes)
7. nSequence of the input (little endian of 4 bytes)
8. hashOutputs (32 byte hash)
9. nLocktime of the transaction (4-byte little-endian)
10. signature sighash type (little endian 4 bytes)

How to get rid of "Analytics Education" when signing in to Google Analytics?

Every time I open the Google Analytics reports view, the "Analytics Education" pop-up window appears in:

http://i.imgur.com/AeqeHqf.png

How to close this default popup?

gmail: problems signing in to Google products or loading pages

In the last 3 months or so, I have noticed that I have problems logging into any Google product, especially Gmail and YouTube. I am using the latest version of Chrome, uninstalled and installed again yesterday, I deleted the cache, cookies and browsing history (all the time).

Note:
1. I have 4 free Gmail accounts + 1 G Suite business account among which I change. Only change after logging out of each one.
2. I am on Macbook Air. The software update is updated.
3. I tried to access YouTube and Gmail through Safari, but it takes years to load it.
4. I have an ADSL connection

The most common mistakes I see after logging in are:
1. a white blank screen
2. the error page attached
3. It takes about 5 minutes to load a page sometimes
4. The page loads but all images are blank

I hope I have detailed my problem well and I hope someone can helpenter the description of the image here

What guarantees does GPG offer by signing a git commit?

It is quite clear that the GPG signature and the ssh keys of GitHub have different purposes

But what good are GPG signature confirmations? Is it just that you know that commitment? abcd1234 Was it signed by Alice's key? Is there anything else for which GPG signing a confirmation is useful?

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* 5TB TRANSFER
* 1 DEDICATED IP (additional IP available)
* ARBOR ANTI-DDOS (100+ GBIT / S) LAYER 3/4 and 7 INCLUDED

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=================================================== ========

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WooServers SSD VPS includes:

Redundant Power Backup
Automated Generator System
99.9% uptime guarantee.
1 month minimum contract
Full root access
Free dedicated server warranty
Free managed support
24x7x365 technical support and network monitoring
Hardware replacement failed

Contact Us:
Skype: WooSales or WooServers
Email: sales@wooservers.com
Website: WooServers.com