Angel \”Java\” Lopez on Blog

October 20, 2017

Blockchain: Links And Resources (97)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 3:45 pm

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A highly optimised, light-weight JS utility for Ethereum
https://github.com/ethjs/ethjs

Ethereum, tokens & smart contracts
https://medium.com/@k3no/ethereum-tokens-smart-contracts-f04cb9bb9431

SegWit: First Steps To Ecosystem
https://cointelegraph.com/news/segwit-first-steps-to-ecosystem

The Token Effect
https://blog.ycombinator.com/the-token-effect/

Zeppelin Token Contracts
https://github.com/OpenZeppelin/zeppelin-solidity/tree/master/contracts/token

In a nutshell: Ian Grigg’s Ricardian contracts and digital assets prehistory
https://bitsonblocks.net/2016/11/22/in-a-nutshell-ian-griggs-ricardian-contracts-and-digital-assets-prehistory/

EOS
https://eos.io/

The Ricardian Contract
http://iang.org/papers/ricardian_contract.html

Stay tuned!

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

October 14, 2017

Blockchain: Links And Resources (93)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 3:48 pm

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Coin Metrics: Useful resources for investors
https://coinmetrics.io/resources/

A platform for open organisations
https://colony.io/

Basic string utilities for Solidity
https://github.com/Arachnid/solidity-stringutils

Remote voting technology based on the Blockchain
https://www.boule.one/

Welcome to the blockchain nation
https://medium.com/e-residency-blog/welcome-to-the-blockchain-nation-5d9b46c06fd4

ERC725: A Self-Sovereign Identity Standard For Ethereum
https://www.ethnews.com/erc725-a-self-sovereign-identity-standard-for-ethereum

Bitcoin, Ether, Litecoin: Coinbase Enables ‘Instant’ Purchases for US Buyers
https://www.coindesk.com/bitcoin-ether-litecoin-coinbase-enables-instant-purchases-for-us-buyers/

As of October 9 2017, why is Bitcoin rising while Litecoin and Ethereum prices are rapidly falling?
https://www.quora.com/As-of-October-9-2017-why-is-Bitcoin-rising-while-Litecoin-and-Ethereum-prices-are-rapidly-falling

Stay tuned!

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

 

October 12, 2017

Blockchain: Links And Resources (92)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 11:47 am

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Bitcoin.org to denounce “Segwit2x”
https://bitcoin.org/en/posts/denounce-segwit2x

BitPay Is Growing? How Startup Suspicions Are Fueling Bitcoin’s Fork Debate
https://www.coindesk.com/bitpay-growing-startup-suspicions-fueling-bitcoins-fork-debate/

Rolling your Own Blockchain in Haskell
https://functional.works-hub.com/blog/Rolling-your-Own-Blockchain-in-Haskell

Central Banks On Cryptocurrency
https://www.ethnews.com/central-banks-on-cryptocurrency

Introducing Mythril: A framework for bug hunting on the Ethereum blockchain
https://medium.com/@muellerberndt/introducing-mythril-a-framework-for-bug-hunting-on-the-ethereum-blockchain-9dc5588f82f6

How I Snatched 153,037 ETH After A Bad Tinder Date
https://medium.com/@rtaylor30/how-i-snatched-your-153-037-eth-after-a-bad-tinder-date-d1d84422a50b

Ethereum: Account Redesign
https://github.com/ethereum/sharding/blob/develop/docs/account_redesign_eip.md

Ethereum: Snappy compression for DEVp2p
https://github.com/ethereum/EIPs/pull/706

Stay tuned!

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

October 10, 2017

Blockchain: Links And Resources (91)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts — ajlopez @ 12:05 pm

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Bitcoin Frightens Governments: John McAfee
https://cointelegraph.com/news/bitcoin-frightens-governments-john-mcafee

Ethereum: Roundup 6
https://blog.ethereum.org/2017/10/09/roundup-6/

Ethereum:transformed bloom bitmap based log search
https://github.com/ethereum/go-ethereum/pull/14631

Ethereum: Easy parallelizability #648
https://github.com/ethereum/EIPs/issues/648

Quantum-secured blockchain
https://arxiv.org/pdf/1705.09258.pdf

Understanding ERC-20 token contracts
https://medium.com/@jgm.orinoco/understanding-erc-20-token-contracts-a809a7310aa5

Who Supports Segwit2x, the New York Agreement and the Upcoming Bitcoin Fork Explained
http://ontimefeed.com/who-supports-segwit2x-the-new-york-agreement-and-the-upcoming-bitcoin-fork-explained/

Bernanke, Berners-Lee to Headline Ripple’s ‘Sibos-Killer’ Conference
https://www.coindesk.com/bernanke-berners-lee-headline-ripple-sibos-killer-conference/

Stay tuned!

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

October 5, 2017

Blockchain: Links And Resources (90)

Filed under: Bitcoin, Blockchain, Ethereum, Links, Smart Contracts, Solidity — ajlopez @ 12:06 pm

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IOHK | Ouroboros Praos Scalability
https://www.youtube.com/watch?v=FUKfB9VkcLc&feature=youtu.be

Blockstream Supporters Mock Those Who Study Economics
https://forum.bitcoin.com/economics/blockstream-supporters-mock-those-who-study-economics-t49159.html

WSJ: Goldman Sachs Planning Direct Bitcoin Trading
https://cointelegraph.com/news/wsj-goldman-sachs-planning-direct-bitcoin-trading

John McAfee unveils new details about long-awaited anti-hacking system ‘Sentinel’
http://www.ibtimes.co.uk/john-mcafee-unveils-new-details-about-long-awaited-anti-hacking-system-sentinel-1641581

Taking Financial Advice From a Lottery Winner
http://awealthofcommonsense.com/2017/10/taking-financial-advice-from-a-lottery-winner/

Hyperledger Crypto Library Ideas
https://docs.google.com/document/d/176v7g6rT1FFb_JCnkUC8eXYL8tzMPgxGi1sFdqUDx_k

What is the zero value for an Enum?
https://ethereum.stackexchange.com/questions/21775/what-is-the-zero-value-for-an-enum

A simple explanation of Bitcoin sidechains
https://gendal.me/2014/10/26/a-simple-explanation-of-bitcoin-sidechains/

Stay tuned!

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

 

October 3, 2017

New Storage In Ethereum/RSK (2)

Filed under: Blockchain, Ethereum, RSK, Smart Contracts, Solidity — ajlopez @ 8:52 am

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Having the feature of storing arbitrary data into an storage cell, we could save dynamic length values in a different way. Actually, saving an string into contract storage in the Etherem Virtual Machine is very convoluted: the string is saved in may cells, with addresses calculated via a hash (see… ).

Now, in RSK contract storage, the string could be saved in a single cell:

A single string should be saved in a single cell of variable length. This feature is not implemented, yet. This post is a proposal. I think it is possible to implement this new feature without changing the normal storage. Two things are needed: some new opcodes and a solidity (or other contract programming language) compiler that uses those new opcodes.

Even the arrays could be saved in a SINGLE cell. The cell address points to a value that describes the array (the length in the below image) and additional storage trie keys had the array values:

The internal storage trie is not limited to 32-bytes keys. It could have keys of arbitrary length.  In the above figure, the index of the array elements are appended to the array address.

Even a map of addresses to balances could be storage in that way:

To discuss in next posts: the new opcodes to implement, storage costs, new compiler output.

Stay tuned!

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

 

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

 

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