Angel \”Java\” Lopez on Blog

September 29, 2017

Blockchain: Links And Resources (88)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts — ajlopez @ 10:44 am

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How one hacker stole thousands of dollars worth of cryptocurrency with a classic code injection hack on EtherDelta and what you can learn from it
https://hackernoon.com/how-one-hacker-stole-thousands-of-dollars-worth-of-cryptocurrency-with-a-classic-code-injection-a3aba5d2bff0

Cardano mainnet is live
https://cardanolaunch.com/

Cardano project
https://iohk.io/projects/cardano/

China’s Crypto Crackdown Won’t Slow Down Asia, Says Ethereum Creator Vitalik Buterin
https://www.forbes.com/sites/elaineramirez/2017/09/27/vitalik-buterin-ethereum-korea-interview/#34263b516357

Viper, new contract language
https://github.com/ethereum/viper

Indian Blockchain Revolution Backed by John McAfee
https://cointelegraph.com/news/indian-blockchain-revolution-backed-by-john-mcafee

Governments in race for blockchain
https://www.raconteur.net/finance/governments-in-race-for-blockchain

Litecoin Creator Charlie Lee Publicly Opposes SegWit2x
https://cointelegraph.com/news/litecoin-creator-charlie-lee-publicly-opposes-segwit2x

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

 

September 28, 2017

Blockchain: Links And Resources (87)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 2:40 pm

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BREAKING: Amazon Will Accept Bitcoin By October
https://squawker.org/technology/breaking-amazon-will-accept-bitcoin-by-october/

Bitcoin Was Just Used to Pay for a New Home in Texas
https://futurism.com/bitcoin-was-just-used-to-pay-for-a-new-home-in-texas/

Ripio Credit Network Announces ICO Pre-Sale, Crowd Sale Starts on October 17
https://www.crowdfundinsider.com/2017/09/122033-ripio-credit-network-announces-ico-pre-sale-crowd-sale-starts-october-17/

Welcome to Bitcoin Country: Silk Road and the Lost Threads of Agorism
https://www.coindesk.com/welcome-bitcoin-country-silk-road-lost-threads-agorism/

Ethereum Solidity Contract Tutorial
https://github.com/ethereum/go-ethereum/wiki/Contract-Tutorial

Untangling Bitcoin: Why Russell Yanofsky Is Taking Apart Crypto’s Oldest Code
https://www.coindesk.com/untangling-bitcoin-russell-yanofsky-taking-apart-cryptos-oldest-code/

One in five central banks say they will be using blockchain tech by 2019
https://qz.com/1083712/one-in-five-central-banks-say-they-will-be-using-blockchain-tech-by-2019/

CoinDash Weekly update — September 19th
https://blog.coindash.io/coindash-weekly-update-september-19th-f4a848bc6dbd

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

September 27, 2017

Blockchain: Links And Resources (86)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 4:17 pm

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A Smart Contract Creator
https://etherparty.io/

Todo sobre Ethereum en Español
http://ethereumdapps.net/

How to implement Cryptographic algorithms in smart contracts
https://ethereum.stackexchange.com/questions/12128/how-to-implement-cryptographic-algorithms-in-smart-contracts

Is there a (theoretical) limit for amount of data that a contract can store?
https://ethereum.stackexchange.com/questions/1038/is-there-a-theoretical-limit-for-amount-of-data-that-a-contract-can-store

Strategist predicts bitcoin, digital currency trading volume will ‘soon surpass’ Apple’s
https://www.cnbc.com/2017/09/22/strategist-predicts-bitcoin-digital-currency-trading-volume-will-soon-surpass-apples.html

Barclays Joins CLS Blockchain Consortium in Search of Swift Alternative
https://www.coindesk.com/barclays-joins-cls-blockchain-consortium-search-swift-alternative/

RANDAO: A DAO working as Random Number Generator of Ethereum
https://github.com/randao/randao

How can I deploy a contract with reference to a library contract without using a graphical user interface like Browser Solidity?
https://ethereum.stackexchange.com/questions/11030/how-can-i-deploy-a-contract-with-reference-to-a-library-contract-without-using-a

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

September 26, 2017

Blockchain: Links And Resources (85)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 10:59 am

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What is Ethereum Metropolis: The Ultimate Guide
https://blockgeeks.com/guides/ethereum-metropolis/

Ropsten testnet chain state
http://status.ropsten.ethereum.org/
Testnet fork activation for the Byzantium (Metropolis part 1) hard fork! Activation block is 1700000 (1.7 million)

‘Crazy’ ICOs are driven by Bitcoin millionaires who need to diversify but don’t want to pay tax
http://uk.businessinsider.com/crazy-ico-bitcoin-millionaires-tax-2017-9

Announcing the winners of the first Underhanded Solidity Coding Contest
https://medium.com/@weka/announcing-the-winners-of-the-first-underhanded-solidity-coding-contest-282563a87079

Lessons Learnt from the Underhanded Solidity Contest
https://medium.com/@chriseth/lessons-learnt-from-the-underhanded-solidity-contest-8388960e09b1

Writing upgradable contracts in Solidity
https://blog.colony.io/writing-upgradeable-contracts-in-solidity-6743f0eecc88

Library Driven Development in Solidity
https://blog.aragon.one/library-driven-development-in-solidity-2bebcaf88736

Toyota pushes into blockchain tech to enable the next generation of cars
https://techcrunch.com/2017/05/22/toyota-pushes-into-blockchain-tech-to-enable-the-next-generation-of-cars/

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

 

September 24, 2017

Building A Blockchain (16)

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In recent months I have been busy working on the RSK project. It’s time to write about my personal blockchain projects:

https://github.com/ajlopez/BlockchainSharp
https://github.com/ajlopez/SimpleBlockchain
https://github.com/ajlopez/RskSharp

Currently, the most active one is the C# project. I added one project:

https://github.com/ajlopez/BlockchainJ

in Java. The experience I gained written all this code (using test-driven design, as usual) gaves me a clear idea of what is involved when building a blockchain. Writing my own implementations gave me better understanding of the parts related to the creation of a blockchain. And now the RSK project (Java core implementation) is public, I’m free to relate this work with an existing full implementation.

The key points to be written are:

  • Entities
  • States
  • Virtual machine to run smart contracts
  • Encoders
  • Consensus
  • Validation logic
  • Inter-node communication
  • Expose node state to external applications

The base entities are:

  • Block
  • Transaction
  • Account

The states to be kept are:

  • Blockchain
  • Account state
  • Contract state

My projects are oriented to have smart contracts, a la Ethereum. One reason to have a virtual machine is be agnostic of host programming language. I think that having a way of run smart contract that is independent of the programming language used in each project, is an interesting feature. So, I should define:

  • Virtual machine opcodes
  • Transient (memory) storage
  • Persistent storage

I need encoders for blocks, transactions and account states. The encoded entities are used in the network communication, local storage, and in the hash calculation. For example, when I have to transmit a block I encoded it. And if I want to send the block to another node, I should encoded the block before transmission. And the encoded data is the basis for hash calculation.

The inter-node communication includes:

  • Message definitions
  • Message and handshake protocol
  • Peer-discovery protocol

Validation logic refers to:

  • Validation of blocks
  • Sign of transaction and its validation

Consensus logic has:

  • Selection of the next block
  • Run of the transactions, updating the accounts/contracts states

The exposure of a node state is implemented in Bitcoin and Ethereum using JSON RPC (Remote procudure call), usually exposed via http. In this way, the node can be accessed by external technologies implemented in different technologies (JavaScript blockchain ecosystems are the more popular).

Followin Ethereum ideas, one entity I implemented many times is a trie. I think my implementations are very simple and effective. I hope to be able to write in the next posts about those implementations.

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

 

 

 

September 23, 2017

Blockchain: Links And Resources (84)

Filed under: Bitcoin, Blockchain, Ethereum, Links — ajlopez @ 4:11 pm

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Scaling Lightning? How Revive Could Boost Bitcoin’s Boldest Scaling Plan
https://www.coindesk.com/scaling-lightning-revive-boost-bitcoins-boldest-scaling-plan

Ethereum’s ERC-20 Token Standard Has Been Formalized
https://www.coindesk.com/ethereums-erc-20-token-standard-formalized/

Steak Is the New Salad: Why These Techies Are Embracing an All-Meat Diet
https://www.inc.com/sonya-mann/bitcoin-carnivores.html

Estonia “Could Raise Billions” in an ICO Says e-Residency’s Director
http://www.trustnodes.com/2017/09/22/estonia-raise-billions-ico-says-e-residencys-director

World Governments Have Declared War on Bitcoin: John McAfee
https://www.thestreet.com/story/14315079/1/bitcoin.html

Principales actores del ecosistem Blokchain en Argentina
https://criptonoticias.com/educacion/principales-actores-ecosistema-blockchain-argentina-organizaron-catedra-bitcoin-buenos-aires/#axzz4tRU6CwLa

Dubai Aims to Be a City Built on Blockchain
https://www.wsj.com/articles/dubai-aims-to-be-a-city-built-on-blockchain-1493086080

John McAfee: China Bitcoin Ban Will Not Extend to Mining
https://www.cryptocoinsnews.com/john-mcafee-china-bitcoin-ban-will-not-extend-mining/

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

September 22, 2017

Artificial Intelligence: Links And Resources (42)

Filed under: Artificial Intelligence, Links — ajlopez @ 4:57 pm

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The Future of Go Summit: AlphaGo & Ke Jie match 1 moves analysis
https://www.youtube.com/watch?v=cupxZ2Mz6VI

Time For A Paradigm Shift Has Come
https://www.reddit.com/r/Iota/comments/70ya29/time_for_a_paradigm_shift_has_come/

IBM Watson: Getting Started with Watson Content Hub APIs (JavaScript)
https://developer.ibm.com/customer-engagement/tutorials/getting-started-api-javascript/

DIY Object Recognition with Raspberry Pi, Node.js, & Watson
https://boneskull.com/diy-object-recognition/

This Is Why All Companies Need An AI Strategy Today
https://www.cbinsights.com/research/artificial-intelligence-strategy/

AlchemyLanguage
https://www.ibm.com/watson/developercloud/alchemy-language.html

Natural Language Understanding
https://www.ibm.com/watson/services/natural-language-understanding/

Plexus: An Interactive Visualization Tool for Analyzing Public Emotions from Twitter Data
https://arxiv.org/ftp/arxiv/papers/1701/1701.06270.pdf

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

September 21, 2017

Blockchain: Links And Resources (83)

Filed under: Bitcoin, Blockchain, Ethereum, Links — ajlopez @ 11:55 am

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Ethereum Founder on ICOs: “We Are in a Bubble, A Lot of Projects Will Fail”
http://www.investopedia.com/news/ethereum-founder-cautions-ico-bubble-vitalek-buterin/

Hong Kong regulator ‘concerned’ by ICO funding boom
https://techcrunch.com/2017/09/05/hong-kong-ico-concern/amp/

Ethereum testnet just verified a zcash transaction
https://www.reddit.com/r/ethereum/comments/712idt/ethereum_testnet_just_verified_a_zcash_transaction/

El ABC del bitcoin: Lo que hay que saber de la moneda digital
http://www.lanacion.com.ar/2064465-el-abc-del-bitcoin-lo-que-hay-que-saber-de-la-moneda-digital

zkSNARKs in a nutshell
https://blog.ethereum.org/2016/12/05/zksnarks-in-a-nutshell/

What are zk-SNARKs?
https://z.cash/technology/zksnarks.html

Atomic Swaps: How the Lightning Network Extends to Altcoins
https://bitcoinmagazine.com/articles/atomic-swaps-how-the-lightning-network-extends-to-altcoins-1484157052/

Atomic cross-chain trading
https://en.bitcoin.it/wiki/Atomic_cross-chain_trading

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

September 20, 2017

Blockchain: Links And Resources (82)

Filed under: Bitcoin, Blockchain, Ethereum, Links, RSK — ajlopez @ 11:53 am

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Key Findings From Cambridge Cryptocurrency Study
https://cointelegraph.com/news/key-findings-from-cambridge-cryptocurrency-study

Global Cryptocurrency Benchmarking Study
https://cointelegraph.com/storage/uploads/view/2017-global-cryptocurrency-benchmarking-study.pdf

At A Major Crypto Conference, Blockchain Projects Tighten Security With Math
https://www.forbes.com/sites/amycastor/2017/08/23/at-crypto-2017-blockchain-presentations-focus-on-proofs-not-concepts/#665417657b70

Blockchain: Qué es y y por qué te cambiará la vida (con ejemplos)
https://www.internautas.org/html/9767.html

Barbarian Investor Show Episode 4 – Coinsilium, RSK and The Internet of Value
https://www.youtube.com/watch?time_continue=3&v=h6v2w4reg_E

Cracking the Ethereum White Paper
https://medium.com/@FolusoOgunlana/cracking-the-ethereum-white-paper-e0e60c44126

How Blockchain Is Kickstarting the Financial Lives of Refugees
https://www.technologyreview.com/s/608764/how-blockchain-is-kickstarting-the-financial-lives-of-refugees/

China’s ICO ban makes more sense in light of its history with fintech
https://techcrunch.com/2017/09/12/chinas-ico-ban-makes-more-sense-in-light-of-its-history-with-fintech/

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

September 19, 2017

Blockchain: Links And Resources (81)

Filed under: Bitcoin, Blockchain, Ethereum, RSK, Smart Contracts — ajlopez @ 11:36 am

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A New Blockchain App Is Poised to Radically Change How People Vote
https://futurism.com/a-new-blockchain-app-is-poised-to-radically-change-how-people-vote/

$4,000: Bitcoin’s Price Shrugs Off China Exchange News
https://www.coindesk.com/bitcoin-price-recovers-from-china-news-to-hit-4000/

RSK, Allowing Technology To Reach The Masses.
http://media.rsk.co/rsk-allowing-technology-to-reach-the-masses/

Major Chinese bitcoin conference flees to Hong Kong as government cracks down on cryptocurrencies
https://www.cnbc.com/2017/09/18/cryptocurrencies-major-bitcoin-conference-flees-as-china-cracks-down.html

The Economic Case for Conservative Bitcoin Development
https://www.coindesk.com/economic-case-conservative-bitcoin-development/

Decentralizing Everything with Ethereum’s Vitalik Buterin
https://techcrunch.com/video/decentralizing-everything-with-ethereums-vitalik-buterin/59c01b739e451049f87f8c18/

The best explainer on how blockchains will upend banking comes from an unexpected source
https://qz.com/1080044/bis-says-central-bank-cryptocurrencies-could-be-a-good-idea/

Ethereum will match Visa in scale in a ‘couple of years’ says founder
https://techcrunch.com/2017/09/18/ethereum-will-replace-visa-in-a-couple-of-years-says-founder/

Stay tuned!

Angel “Java” Lopez
https://github.com/ajlopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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