Larry larry0x

LVM Setup on DO for striped block devices:

This example is specifically for my Osmosis seed node, that I run in the cloud, all my other nodes are on hardware, and I use a very different setup on those.

These instructions should work on just about any cloud provider, by striping block devices it's possible to get much higher IOPS and throughput. On Omosis in particular this is important. It doesn't cost any more to use striped volumes, so for example 3 40GB volumes cost the same as a single 120GB, but give (almost) 3x the performance.

After provisioning new block devices (do not format automatically) in the DO console and attaching them, ssh into the droplet and as root follow the directions below. I try to shoot for < 50% usage, so right now with about 120GiB needed, three 90GB volumes will do nicely.

_Note that extending the volume group in the future will require adding exactly the same number and size of volumes. Alternatively you can just use the same procedure here to move the files into a new vol

set -e, -u, -o, -x pipefail

The set lines

These lines deliberately cause your script to fail. Wait, what? Believe me, this is a good thing.
With these settings, certain common errors will cause the script to immediately fail, explicitly and loudly. Otherwise, you can get hidden bugs that are discovered only when they blow up in production.

set -euxo pipefail is short for:

set -e
set -u

Note: PBSS in Geth >=1.13.0 removes the need to prune manually.

Old content for reference

Overview

Geth (Go-Ethereum) as of July 2022 takes about 650 GiB of space on a fast/snap sync, and then grows by ~ 14 GiB/week with default cache, ~ 8 GiB/week with more cache.

ICS: Cinderella Tokens: An Async/IBC friendly alternative to flash loans

Flashloans are a fascinating economic coordination mechanism that has emerged out the Ethereum architecture as a result of a synchronous, sequential, atomic transaction system. It allows anonymous coordination between capital providers and arbitrageurs because the capital providers can condition providing any capital on protocol enforced guarantee that the entire arbitrage is profitable denominated in the token being lent.

One of the effects of this process has been the it ensures an efficient and healthy liquidation market for the collateral in long term debt instruments. It also enables low cost scaling of economic exploits.

Why don’t flash loans exist in IBC world?

Flash loans are impossible in an IBC world because IBC semantics require finalizing a block on the origin chain rather than on the receiving chain. This makes atomicity for the lender difficult and moves us into the domain of over collateralized lending.

Support for Cosmos SDK Stargate in CosmJS has been ongoing work for several months now. Stargate is released and CosmJS is here to connect to it.

Starting points

Let's explore what is new for Stargate support:

@cosmjs/proto-signing, which implements the new SIGN_MODE_DIRECT based on protobuf serializations
@cosmjs/stargate, which provides a high level client for querying, signing and broadcasting
@cosmjs/cosmwasm-stargate for interacting with CosmWasm smart contracts on Stargate chains

Probably one of the easiest things you'll ever do with gpg

Install Keybase: https://keybase.io/download and Ensure the keybase cli is in your PATH

First get the public key

keybase pgp export | gpg --import

Next get the private key

	#!/bin/bash

	ROCKSDB_VERSION=5.11.3

	#Run as a root user
	if [ "$EUID" -ne 0 ]
	then echo "Please run as root (with sudo command)"
	exit
	fi

	git rebase --exec 'git commit --amend --no-edit -n -S' -i <previous-commit>

	make a branch from your branch with unsigned commits (git checkout -b ...)
	use git log --show-signature to see which are not signed
	use the commit BEFORE the first one you want to fix in the above command (as <previous-commit>)
	accept the generated file (don't change it)
	save the file
	use git log --show-signature to show the commits are now signed
	push up

	import numpy as np
	from math import sqrt

	scaling = False

	# Implements Kabsch algorithm - best fit.
	# Supports scaling (umeyama)
	# Compares well to SA results for the same data.
	# Input:
	# Nominal A Nx3 matrix of points

	/*

	This module creates an HTTPS web server and serves static content
	from a specified directory on a specified port.

	To generate a new cert:

	openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365

	To remove the passphrase requirement: