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Error: Callback was already called – Ganache

July 9, 2020
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OpenZeppelin has some neat docs to show how to create, deploy and interact with smart contracts centered around installing node, using the OpenZeppelin libraries, compiling via CLI, and deploying via Ganache which is a local blockchain environment for development and testing. Some of you may remember TestRPC. Ganache is the new name of TestRPC.  The TestRPC quickly became more powerful than simply a blockchain environment used for testing. To stay with the sweet Truffle brand, we decided to rename it Ganache, as Ganache is (often) the core of your favorite chocolate truffle. It’s a much catchier name (and a much tastier one too). https://www.trufflesuite.com/blog/testrpc-is-now-ganache The problem though is when you follow the docs at https://docs.openzeppelin.com/learn/deploying-and-interacting and run: npx ganache-cli --deterministic to get a list of all the available accounts, you might encounter this error: Ganache CLI v6.9.1 (ganache-core: 2.10.2)Error: Callback was already called. The problem is because you probably have node v14 installed. Run: node -v to check. For me, I installed node initially with the brew command brew install node which downloaded the latest version which was v14.5.0 The reason is an issue related to ganache-core’s internals not yet being Node v14 compatible. https://github.com/trufflesuite/ganache-cli/issues/732 Workaround Install Node v12 for […]
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Understanding The ICO Landscape Podcast with Jose Mota from OST

October 10, 2018
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I had the opportunity to share my knowledge on Tokenomics talking about tokens, ICOs and blockchains with podcaster Jose Mota. Check it out below. https://medium.com/ostdotcom/recap-from-ost-live-with-tokenomics-author-sean-au-understanding-the-ico-landscape-ed498d4700a0 https://itunes.apple.com/us/podcast/ost-live-blockchain-branded-tokens-and-token-economies/id1432951800?mt=2#episodeGuid=http%3A%2F%2Fwww.blubrry.com%2Fostlive%2F38114241%2F  
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Cryptocurrencies and Tax in NZ

April 3, 2018
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This is how to official handle cryptocurrencies and tax in New Zealand. https://media.ird.govt.nz/articles/cryptocurrency-investors-reminded-of-their-tax-obligations/
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Accounting on the blockchain for SME

July 24, 2017
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I had an idea to give the accounting industry a little tickle up so did a bunch of some research and found out there wasn’t much on accounting on the blockchain. There’s a lot of fluff from the “big four” that uses big words like “hash” and “consensus algorithms” along with mentions of single, double and even triple entry accounting but nothing of real substance. What do accounting applications such as Xero, MYOB, Sage and Intuit actually do? Fundamentally they take transaction data as an input (manually entered, scanned receipts with optical character recognition or bank feeds) and produce nice pretty reports and the ability to create invoices and perform reconciliations as well. Many of them have wonderful extra features such as payroll and inventory management but let’s just keep things simple and ignore this for now. Accountants use these applications to perform tasks such as submitting tax returns and understanding the financial health of a company. Again, a simplistic view and we’re talking SMEs here. (Small to Medium Enterprise). Now imagine the day when your local supermarket accepts bitcoins or any other form of cryptocurrency. Imagine getting paid in bitcoins and paying your suppliers in bitcoins. Current thinking and […]
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Bitcoin Exchanges in NZ

June 27, 2017
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Here is a neat site that list some, if not all of the bitcoin exchanges in New Zealand. https://www.bitcoinexchange.co.nz There are a handful of proper exchanges. The others are either shut down or use Localbitcoins under the hood.
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Blockchain vs. Bullshit: Thoughts on the Future of Money

April 24, 2017
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Another great talk by Andreas Antonopoulos. Some key points. There is a lot of BS going around. BAU disguised as innovation Blockchain is bitcoin with a haircut and a suit that you parade in front of your board Define blockchain in such a way that you can’t replace it with database and still make the sentence work Open, borderless, transnational, no 3rd parties, neutral, decentralised Consortium = Cartel This isn’t about banking the unbanked. It’s about debanking all of us  
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Protected: Understanding how permissioned blockchains can work for you?

April 9, 2017
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There is no excerpt because this is a protected post.
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Protected: STEM

May 4, 2016
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There is no excerpt because this is a protected post.
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Protected: Innovation Challenge

January 7, 2016
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There is no excerpt because this is a protected post.
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