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 18, 2017

Blockchain: Links And Resources (96)

Filed under: Bitcoin, Blockchain, Ethereum, Links — ajlopez @ 3:51 pm

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Architecture of the Hyperledger Blockchain Fabric∗
https://www.zurich.ibm.com/dccl/papers/cachin_dccl.pdf

Zk-Starks? New Take on Zcash Tech Could Power Truly Private Blockchains
https://www.coindesk.com/zk-starks-new-take-on-zcash-tech-could-power-truly-private-blockchains

Why Blockchain Technology is Perfect for Fighting DDoS Attacks
https://cointelegraph.com/news/why-blockchain-technology-is-perfect-for-fighting-ddos-attacks

European Innovation Council Will Award 5 Million Euros To ‘Blockchain For Social Good’
https://www.ethnews.com/european-innovation-council-will-award-5-million-euros-to-blockchain-for-social-good?platform=hootsuite

Collaboration FTW: How Blockchain Came So Far, So Fast
https://www.coindesk.com/collaboration-ftw-blockchain-came-far-fast

Another Statistic from ETHWaterloo: 63% of Central Banks are working with Ethereum
https://amp.reddit.com/r/ethtrader/comments/76f20d/another_statistic_from_ethwaterloo_63_of_central/

Swiss City of Zug Backs Blockchain Asset Trade Group
https://www.coindesk.com/swiss-city-zug-backs-blockchain-asset-trade-group/

Bitcoin Rich List
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html

Stay tuned!

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

October 17, 2017

Blockchain: Links And Resources (95)

Filed under: Bitcoin, Blockchain, Ethereum, Links, RSK — ajlopez @ 12:06 pm

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Blockchain Project Ecosysteml
https://medium.com/@josh_nussbaum/blockchain-project-ecosystem-8940ababaf27

Bitcoin, Ethereum, Segwit 2X, Atomic Swaps, Lightning Network, and Blockchain Technology w/ Charlie Lee and Tuur Demeester
https://overcast.fm/+I6zHxIJu8

How blockchain might change payments for small businesses
https://www.applancer.co/blog/how-blockchain-might-change-payments-for-small-businesses

India’s interest in Bitcoin and other cryptos could shake the market
https://www.applancer.co/blog/india-interest-in-bitcoin-and-other-cryptos-could-shake-the-market

Simple scheme for VISA-scale micro transactions with zk-snarks
https://www.reddit.com/r/ethereum/comments/767o9p/simple_scheme_for_visascale_micro_transactions/

Ethereum Developers Find Geth Bug as Hard Fork Nears
https://www.coindesk.com/ethereums-geth-client-finds-vulnerability-less-two-days-before-fork/

Ethereum Price Is on Target to Hit $400 in the Near Future
https://themerkle.com/ethereum-price-is-on-target-to-hit-400-in-the-near-future/

Ethereum Foundation Expects No Shady Business in Upcoming Fork
https://hacked.com/ethereum-foundation-expects-no-shady-business-upcoming-fork/

Stay tuned!

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

October 16, 2017

Blockchain: Links And Resources (94)

Filed under: Bitcoin, Blockchain, Ethereum, Links — ajlopez @ 3:58 pm

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Like Internet, Blockchain is Encroaching into Every Part of Human Existence
https://cointelegraph.com/news/like-internet-blockchain-is-encroaching-into-every-part-of-human-existence

Bitcoin’s market value is now larger than Goldman Sachs and Morgan Stanley
https://www.cnbc.com/2017/10/13/bitcoin-market-cap-bigger-than-goldman-sachs-and-morgan-stanley.html

Coinbase Launches ‘Instant’ Purchases of Bitcoin, Litecoin and Ethereum
https://www.coinspeaker.com/2017/10/13/coinbase-launches-instant-purchases-bitcoin-litecoin-ethereum/amp/

Blockchain Dev Jobs
https://blockchaindevjobs.com/

Ethereum Byzantium Hard Fork Announcement
https://blog.ethereum.org/2017/10/12/byzantium-hf-announcement/

Ethereum Virtual Machine: Where are the opcode 0xfe and 0xfd documented?
https://ethereum.stackexchange.com/questions/19152/where-are-the-opcode-0xfe-and-0xfd-documented

Woo’s Law: Bitcoin Users Double Every 12 Months; Major Factor For Long-Term Price Surge?
https://www.cryptocoinsnews.com/woos-law-bitcoin-users-double-every-12-months-major-factor-for-long-term-price-surge/

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

 

October 1, 2017

Blockchain: Links And Resources (89)

Filed under: Bitcoin, Blockchain, Ethereum, Hyperledger — ajlopez @ 2:41 pm

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Metropolis Today: The Shifting Plans for Ethereum’s Next Big Upgrade
https://www.coindesk.com/metropolis-today-shifting-plans-ethereums-next-big-upgrade/

Ethereum’s Next Hard Fork Is Now Officially Being Tested
https://www.coindesk.com/ethereums-next-hard-fork-now-officially-tested/

Patientory’s Journey to Change Healthcare
https://bitcoinmagazine.com/articles/patientorys-journey-change-healthcare/#1506354729

Another Bitcoin New York Agreement Partner Cancels SegWit2x Support
https://cointelegraph.com/news/another-bitcoin-new-york-agreement-partner-cancels-segwit2x-support

A Giant-Sized History of Bitcoin
https://briandcolwell.com/2017/06/a-giant-sized-history-of-bitcoin/.html

Hyperledger Gains 10 New Members
https://www.hyperledger.org/announcements/2017/09/26/hyperledger-gains-10-new-members

ETHNews: Hyperledger Announces Sawtooth Ethereum, A Proof Of Concept Integration
https://www.hyperledger.org/news/2017/08/22/8-22-10-ethnews-hyperledger-announces-sawtooth-ethereum-a-proof-of-concept-integration

Blockchain for good hackathon
http://events.linuxfoundation.org/events/blockchain-for-good-hackathon

Stay tuned!

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

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