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Published in Coinmonks

·Oct 6, 2019

Store data in Ethereum by logging to reduce gas cost

I propose a realistic solution to using Ethereum as a public ledger — Problems are gas cost and capacity We will face two problems with using Ethereum as a public ledger. The first one is the gas cost. Storing data to storage is the most expensive operation. (see SSTORE gas cost) The other one is capacity. …

Ethereum

3 min read

Store data in Ethereum by logging to reduce gas cost
Store data in Ethereum by logging to reduce gas cost
Ethereum

3 min read


Published in Coinmonks

·Aug 9, 2019

IPFS Production Configuration

Near future, our team will use IPFS for production service so I investigated lots about the configuration of it. I’m going to share my learned knowledge. 1. Preparation At first, export “IPFS_PATH”. export IPFS_PATH=/data/ipfsrep The IPFS repository is created to this path. The default path is your $HOME. …

Ipfs

4 min read

IPFS Production Configuration
IPFS Production Configuration
Ipfs

4 min read


Apr 9, 2019

Build HTTPS Support Load Balancer on Azure

Setting ssl to Application Gateway using Ubuntu VM. I was so tired to achieve this, so I left my knowledge here. In Azure, there are 2 types of load balancer. One is Load Balancer and the other is Application Gateway. If you want to support https, only Application Gateway is…

Ssl

3 min read

Build HTTPS Support Load Balancer on Azure
Build HTTPS Support Load Balancer on Azure
Ssl

3 min read


Published in LayerX

·Mar 22, 2019

Standard Sharing Economy Protocol for Smart Contract

Blockchain is a good target to establish sharing economy, because the lessor and lessee can connected each other without any intermediates, like Uber or Aribnb. So, the lessor no longer be bothered by high margin cost. Origin Protocol is the pioneer of sharing economy on top of the Ethereum. …

Ethereum

4 min read

Standard Sharing Economy Protocol for Smart Contract
Standard Sharing Economy Protocol for Smart Contract
Ethereum

4 min read


Published in LayerX

·Feb 18, 2019

How to reduce gas cost in Solidity

Gas efficiency tend to be low prioritized in most of the case. Since many projects pay attentions on security or cording readability. This time, I focus on gas cost saving. Then, I introduce 13 tips to reduce gas cost. Pre conditions The gas cost is calculated by Remix as compiler version is…

Ethereum

6 min read

How to reduce gas cost in Solidity
How to reduce gas cost in Solidity
Ethereum

6 min read


Published in Coinmonks

·Nov 23, 2018

Express Quantstamp contracts as javascript — Audit completed

Quantstamp is a smart contract security audit system by scalable and cost-effective way. I express Quantstamp contracts as Javascript for better understanding. Please refer to white paper or official blog for more information. GitHub: quantstamp-contracts-js Brief overview of Quantstamp The smart contract security is essential to prevent security incident like the DAO. Unfortunately, Current…

Ethereum

4 min read

Express Quantstamp contracts as javascript — Audit completed
Express Quantstamp contracts as javascript — Audit completed
Ethereum

4 min read


Published in Coinmonks

·Nov 2, 2018

Express Plasma MVP as Javascript — Simple Withdrawal

I express Plasma MVP as Javascript for a better understanding of my study. MVP is minimal viable plasma which is originally proposed by Vbuterin aiming to provide the basic security properties of Plasma in a very simplified way. Based on this proposal, OmiseGo implemented MVP for research aiming to use…

Plasma

7 min read

Express Plasma MVP as Javascript — Simple Withdrawal
Express Plasma MVP as Javascript — Simple Withdrawal
Plasma

7 min read


Published in Coinmonks

·Oct 14, 2018

Express uPort as javascript — Relay transaction to 3rd party Dapp.

uPort is famous Ethereum project. In my opinion, uPort is the most successful self sovereign identity platform around blockchain. So I think understanding its strategy is helpful for our career. I express uPort contracts and IPFS or other objects as javascript. Then I simulate how work uPort is. Honestly, I…

Blockchain

4 min read

Express uPort as javascript — Relay transaction to 3rd party Dapp.
Express uPort as javascript — Relay transaction to 3rd party Dapp.
Blockchain

4 min read


Published in Coinmonks

·Oct 12, 2018

Express uPort as javascript — Set IPFS hash to Registry Contract

uPort is famous Ethereum project. In my opinion, uPort is the most successful self sovereign identity platform around blockchain. So I think understanding its strategy is helpful for our career. I express uPort contracts and IPFS or other objects as javascript. Then I simulate how work uPort is. Honestly, I…

Java Script

5 min read

Express uPort as javascript — Set IPFS hash to Registry Contract
Express uPort as javascript — Set IPFS hash to Registry Contract
Java Script

5 min read


Published in Coinmonks

·Oct 11, 2018

Use ‘secp256r1’ to create JWT. Can not use 'secp256k1' which is famous for Bitcoin

When I studied about uPort which is famous for self sovereign identity platform on Ethereum, I struggled to create JWT(uPort achieve off-chain identification by JWT). So, I note my experience for future learner. Working sample code on Gist: jwt-secp256k1-secp256r1.js Error happen We can use ECDSA public/private key pair to sign JWT as…

Java Script

2 min read

Can not use 'secp256k1' which is common on Crypto Currency to create JWT
Can not use 'secp256k1' which is common on Crypto Currency to create JWT
Java Script

2 min read

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79 Followers

Japanese software engineer. Like blockchain, sauna and manga. re795h@gmail.com

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    Gaurav Agrawal

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    Takahiko Kawasaki

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    Shin'ichiro Matsuo

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    Shun Takagiwa / 高際 隼

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