private key – Can I recover btc sent to an incorrect address? (electrum)

Can I recover btc sent to an incorrect address?

Confirmed Bitcoin transactions cannot be cancelled, reversed, undone or recovered.

The only person who can give you your money back is the recipient, by creating a new transaction to send the same amount back to you.

I realize now that I had a malware copy of electrum

If the initial mishap was due to a malware copy of Electrum, there is no chance the criminals, who created that, would choose to give back money they stole from you.

architecture – Architecting multiple codebases calling our public API + private API for first-party applications

Currently, we have the issue where we have two codebases (API & Website) calling the same database (along with some duplicate business logic) and we want to streamline this so all requests are routed via our API. We have a public REST API, and we have a website. Some functionality of the website is achievable through the public API, but some will need to come from a private API that only our secure backend can access.

Our website will be re-created as an embedded web app that can be put anywhere and calls our public API’s (think a lightweight react/vue project). However, for the official web app running under our domain we will need extra special privileges, such as doing specific admin-related tasks that only we should be able to do (thus requiring a private API). This has led me to create the architecture below:

enter image description here

This architecture achieves the following:

  • Single source of truth (our API) that talks to the database.
  • Only the Web App under our domain has any concept of the private API, and even if the code was inspected requests would be opaque as they are just be routed to a secure backend.
  • Allows us to roll out future first-party projects that can use the same secure backend.

Is this a good approach? Are there some big pitfalls I’m missing? Also I plan on making the Official Web App & the Secure Backend two separate code bases as ideally we would like to swap out the official web app (frontend) with some other arbitrary first-class project and expect it to operate in a similar fashion. It should also be noted the private API will be part of the same codebase as the public API, just with private endpoints exposed so it can access a lot of the business rules it needs to.

Thanks.
(Also please excuse my incorrect use of GCP icons).

openssl: How to configure private key size for secp256k1

I am trying to understand if it’s possible to configure a private key size for the given curve.

openssl ecparam -name secp256k1 -genkey

-----BEGIN EC PARAMETERS-----
BgUrgQQACg==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIMda3jdFuTnGd2Y9s9lZiQJXKSpxBp6WQWcurn4FnYogoAcGBSuBBAAK
oUQDQgAEI272v3lIoVkLZEbsJ/1l6Wfqbk8ZeybzzhtUN60EOhCRsR8rOLAIbbDl
ncOT1vtzEj5NZxQEYdopFMb10CfccQ

Was trying to read openssl documentation to see how to configure the length of the private key but failed to find anything regarding it. Could you advise?

neural networks – In a machine learning system, why use differentially private SGD if our input data is already perturbed by a DP mechanism?

I’m trying to implement my own version of a deep neural network with differential privacy to preserve the privacy of the parties involved in the training dataset.

I’m using the method by Abadi et al. proposed in their seminal paper Deep Learning with Differential Privacy as the basis of my implementation. Now I have trouble understanding one thing in this paper. In their method, they propose a differentially private SGD optimisation function and they use an accountant to keep their privacy budget expenditure during each iteration. All of this makes sense: every time you query the data, you need to add controlled noise to it to mitigate the risk of leakage. But before they begin the training process, they add a differentially private PCA layer and filter their data through it.

My confusion is about why we do need to have DP-SGD after this (or the other way around, why DP-PCA when we’re already ensuring DP with our DP-SDG method). I mean, based on post-processing principle, if a mechanism is say (epsilon)-DP, any function performed on the output of that mechanism is also (epsilon)-DP. Now since we’re already applying an (epsilon)-differentially private PCA mechanism on our data, why do we need to have the whole DP-SGD process after that? I understand the problem with local DP and why it’s much more efficient to do global DP on the model instead of the training data, but I’m wondering if we’re already applying DP during the training phase, is it really necessary for the PCA to be DP as well or could we have just used normal DP or another dimensionality reduction method?

api – library for validating bitcoin private and public keys

No sane application should EVER attempt to validate a private key by attempting to pass it to an external API. That’s a ridiculously easy way to lose all your funds if the API operator is malicious, compromised, or someone is eavesdropping on your communication with said API.

You should do this yourself, preferably using a well tested, community supported, open source library for your choice of language – most major languages have such libraries.

If this is too much work, you should reconsider building something like this. Do not compromise on safety, especially if you intend for other people to trust this code with their funds.

Bitcoin’s Cryptographic protocol allows for leakage of information about one’s Private Key, making recalculation of the private key possible?

Is this true, the cryptography which is used in bitcoin allows for leakage of information which could be used to recalculate the private key – IF you are continously reusing the same public address for transactions?

I think there were Faulty client implementations in the past which have and mishandled the protocol and leaked the keys when reusing same address.

If that is correct, is it possible to make any kind of mathematical assumption, how many times of reusing the same address could practically enable the reengineering of the private key?

After how many times of reusage would you strictly advice a user to
migrate to another wallet with a new private key? Two times reusage is enough to break the key?

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linux – Firefox Private Browsing: how to set search bar to use google.com/ncr by default?

Is there a place to change the Firefox installation so it uses google.com/ncr by default instead of the local google.com ? Other than having to set cookies each time the browser is opened, or install third party extensions?

Previously posted solutions appear to be obsolete. In particular, searchplugins/google.xml and open-search-providers/google.xml do not exist.

linux – Can access port on public IP but not private

I have a PC running a web server on port 8080, and SSHd running on port 22. In my router settings, I have forwarded port 8080 to 80, and set up an ANAME record on my domain pointing to the public IP. I am able to access my site on both my public IP port 80 and on my domain. However, I am not able to access the port using the private IP, or SSH into the PC. The PC has a static IP configured. How can I fix this?

API for validating bitcoin private and public keys

I am building a python script that gets a string and determines if it is a valid bitcoin private key or public key, and if so it returns its type/format (base58, BIP32, HexaDecimal etc.) and its derivations (public key from private key and address from public key).

Is there any free API that I can use to get those details?

I have tried to do so myself but there are a lot of formats of keys and mathematical computations for validation and derivation the keys.
Thank you.