2075

Collection of reference material to do fixed point arithmetic on substrate based chains.

overview

How can I do math on floating point values in substrate runtime. As a simple example imagine I want to keep track of an interest rate in a decentralized finance application. I can prototype by using the percentage as an integer:

  let rate = 2;
  let dividend = capital * rate / 100;

But what if my interest rate is 2.5% or 2.4554%?

curl https://ipfs.io/ipfs/QmUF87tsWpG1HgwuuqKdBMB8hHjk57Ag5wVnPptL7uKmTN?filename=db.partaa && \
curl https://ipfs.io/ipfs/QmYHuEehCETAat3GV8MbxrmZ7DzjtoV1pabfSSmvSkNyyn?filename=db.partab && \
curl https://ipfs.io/ipfs/QmRHom4VZHzAiJcBe8F3hJBWecr8NWfzDcHSeqt6ZwNZ9L?filename=db.partac && \
curl https://ipfs.io/ipfs/QmZLBdDWMo9or8JqfwRqniFAaGm2UvoBcpj4nho4W8Lrqi?filename=db.partad && \
curl https://ipfs.io/ipfs/QmNzMHAbRrBYEb7TSzpwrB1sMHwTMngW2LLJtiH65Xhfsi?filename=db.partae && \
curl https://ipfs.io/ipfs/QmavxbmSzpcEA5KzR4LoLYJUVCAwceVJMEtbyuQwyLrwTR?filename=db.partaf && \
cat db.part* > db.tar.gz

W3F Open Grant Proposal

This document will be part of the terms and conditions of your agreement and therefore needs to contain all the required information about the project. Don't remove any of the mandatory parts presented in bold letters or as headlines! Lines starting with a > (such as this one) can be removed.

See the Open Grants Program Process on how to submit a proposal.

Project Name: Generic Bonding Curves
Team Name: ZERO.IO / GameDAO
Payment Address: DAI 0x5ae30612FC6CDA7190a5195cdA95107605450dF4

Version A

sudo mdutil -E /

Version B

sudo mdutil -a -i off
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist`
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist`

{
  "Address": "MultiAddress",
  "LookupSource": "MultiAddress",
  
  "AccountInfo": "AccountInfoWithDualRefCount",
  "AccountInfoWithDualRefCount": {
    "nonce": "Index",
    "consumers": "RefCount",
    "providers": "RefCount",

Handle with care

5.10.0

mkdir -p /tmp/ && cd /tmp/ && \
  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10/amd64/linux-headers-5.10.0-051000_5.10.0-051000.202012132330_all.deb && \
  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10/amd64/linux-headers-5.10.0-051000-generic_5.10.0-051000.202012132330_amd64.deb && \
  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10/amd64/linux-image-unsigned-5.10.0-051000-generic_5.10.0-051000.202012132330_amd64.deb && \
  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10/amd64/linux-modules-5.10.0-051000-generic_5.10.0-051000.202012132330_amd64.deb && \
  sudo dpkg -i *.deb

setup a node

this example assumes you are using e.g. ubuntu and is a simple and direct route.
if you want to use this in production you should take care of better security measures!

updates

sudo apt update

HAVEN/VISION

Ownership and Location for real world assets*

A consensus algorithm for mobile items

About HAVEN

HAVEN/VISION is an innovation company in personal item security. Across our services we implement and run various decentralised network structures on hardware and software level.

Network Topography

To enable services for endusers and business partners, we have decided to run a combination of centralised and decentralised network nodes to accomplish a shorter setup period leaving room for innovation and stable growth:

	# setup your node parameters here
	ROOT_DIR = $(CURDIR)
	RELAY_DIR = $(ROOT_DIR)/polkadot
	RELAY_NAME = rococo-local
	PARA_NAME = gamedao
	PARA_DIR = $(ROOT_DIR)/$(PARA_NAME)-parachain
	RES_DIR = $(ROOT_DIR)/resources
	PARA_ID = 2075

	# build all nodes and required configs and specs

	{
	"Address": "MultiAddress",
	"LookupSource": "MultiAddress",
	"AccountInfo": "AccountInfoWithDualRefCount",
	"AccountInfoWithDualRefCount": {
	"nonce": "Index",
	"consumers": "RefCount",
	"providers": "RefCount",
	"data": "AccountData"
	},