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Cryptocurrency Ethereum Mastering Development

How to get ethereumjs-abi’s soliditySHA3 and web3 sign equivalents in ethersjs?

Hello I’d like to create a hash using ethersjs that encodes a number of arguments. I previously used ethereumjs-abi’s soliditySHA3 function but not sure which of ethersjs crypto utilities is the correct one. It currently looks like this: const hash = “0x” + abi.soliditySHA3(“address”, “uint256”, “uint256”, “address”],[recipient, amount, nonce, contractAddress]).toString(“hex”); signature = await web3.eth.personal.sign(hash, from, […]

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Ask Health Medical

I am confused, what STI could this be? [closed]

I saw this around my pubic days after unprotected-sex. Please help me identify

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CMS Magento Mastering Development

Enabling zoom when on gallery fullscreen

How can I get the zoom effect on a gallery product page to show when I am in full screen mode? I am using Magento 2.3.4 enterprise. This is what I have in myTheme/etc/view.xml file. <vars module=”Magento_Catalog”> <!– Gallery and magnifier theme settings. Start –> <var name=”gallery”> <var name=”nav”>dots</var> <!– Gallery navigation style (false/thumbs/dots) –> […]

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Ask Biology

Is it possible for a mammal to evolve iridescent horns that appear metallic like chrysina resplendens’ chitinous exoskeletons?

Would it be possible for humans or other mammals, if we developed horns, to have said horns be iridescent and possibly even highly reflective like a metal, even appearing pure solid gold? For instance, say we redid evolution and mammals ended up with endoskeletons made of chitin rather than keratin? For instance, the chrysina resplendens […]

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CMS Mastering Development Wordpress

Transferred WordPress site to new server msyql isn’t spiking cpu anymore, can I discard theme and plugins as the problem

I recently had dealing with high cpu usage on a WordPress site installed on a virtual private server with 2 vCore, 80GB SSD, 4GB of memory, Ubuntu 18.04, Apache 2.4.29, and mysql community version 8.0.20. After a lot of troubleshooting steps, including logging slow queries and tuning the my.cnf file, and disabling theme and plugins, […]

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Linux Mastering Development

Bootloader vs boot manager

It seems that “bootloader” and “boot manager” are commonly interchanged. I know that rEFInd is a boot manager and not a bootloader. I know that grub2 is a bootloader and I think that it’s a boot manager as well. Are there any crucial differences between the two terms, and precisely which categories do common names […]

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Linux Mastering Development

gpg error installing docker on debian stretch

I followed these instructions for installing docker on debian 9.11 “stretch” https://docs.docker.com/engine/install/debian/ My file /etc/apt/sources.list looks like this deb http://repo.myloc.de/debian stretch main non-free contrib deb-src http://repo.myloc.de/debian stretch main non-free contrib deb http://repo.myloc.de/debian-security stretch/updates main deb-src http://repo.myloc.de/debian-security stretch/updates main deb http://repo.myloc.de/debian stretch-updates main deb-src http://repo.myloc.de/debian stretch-updates main deb https://download.docker.com/linux/debian stretch stable #deb-src [arch=amd64] https://download.docker.com/linux/debian stretch stable […]

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Linux Mastering Development

How To Back Up Filesystem as a Zip to External Hard Drive?

Hi there trying to back up my filesystem to an external hard drive saved as a zip. Most of the help on the net so far shows how to backup certain directories but I didn’t see anywhere showing when someone wants to back up / everything. Less /proc with the -x switch. I am trying […]

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Ask Engineering

How to use two antennas with a single Bluetooth module? (BLE repeater)

I am working on a project that uses small Bluetooth low energy (BLE) beacons to track important items. However, we have run into a situation where one location will store these items underground in a metal storage container, causing the system to be unable to “see” the beacons inside, and thus thinking they have been […]

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Ask Engineering

MOSFET with load on source alternative

I’m pretty new to EE and I’m trying to use a sensor and saving battery as much as possible. I’ve already looked into similar topics (like this), but they are not satisfying me. So, I want to power up sensor from time to time and get its output. Its regular capacitive soil moisture sensor, that’s […]