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      "permlink": "steemitboard-notify-daveappleton-20190425t172609000z",
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      "body": "Congratulations @daveappleton! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@daveappleton/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@daveappleton) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=daveappleton)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "Congratulations @daveappleton! You have received a personal award!\n\n[![](https://steemitimages.com/70x70/http://steemitboard.com/@daveappleton/birthday1.png)](http://steemitboard.com/@daveappleton)  1 Year on Steemit\nClick on the badge to view your own Board of Honor on SteemitBoard.\n\n> Upvote this notificationto to help all Steemit users. Learn why [here](https://steemit.com/steemitboard/@steemitboard/http-i-cubeupload-com-7ciqeo-png)!",
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      "permlink": "re-daveappleton-staying-safe-with-myetherwallet-and-metamask-20180119t001035663z",
      "title": "",
      "body": "hi Guys! Today it doesn't seem to be my day: the ICO I had participated at just unfroze the tokens and I don't see them in my Jaxx Wallet. Plus, the tokens I had in my MetaMask are not there anymore. I added the contract address and they still don't show up. I mean, it appears the name of the coin but with 0 balance. There was 0.01 ETH but it's also not there. I had recently changed my gmail password. I received an email from Google saying there was a device that connected to my account from Los Angeles, but I live in San Francisco and bought the Chromebook here. I had just installed Linux in my Chromebook (the cheapest one). The browser in Linux doesn't enter the Internet, so I'm still using Chrome as browser (MetaMask extension). Any piece of advice, please? ;(",
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      "parent_author": "",
      "parent_permlink": "ethereum",
      "author": "daveappleton",
      "permlink": "ethereum-from-the-ground-up-part-ii-where-ethereum-is-different",
      "title": "Ethereum from the ground up - part II - where ethereum is different",
      "body": "In the previous episode....\n---\nWe left of at that part of the story that told the structure of a blockchain but let's return to the transaction itself.\n\nignoring the actual key values\n\n```\n{\n   From : Dave\n   To : Alice\n   Value : 100\n   Data : \"Happy Birthday Alice. Buy yourself something nice\"\n  Signature : xyzzy\n}\n```\n\nI had added data into the transaction to let Alice know that I remember her - but this data could be almost anything that could be interpreted by the receiving party. In this case it is a greeting plus a set of instructions to Alice. This data will stay on the blockchain in its block forever.\n\nA computer program is also, in its most basic form, data. The instructions are simply bytes of code. \n\nThe innovation in ethereum was to \n* define a `virtual machine` to interpret the data as a program\n* allow you to share the data with an address as a `smart contract`\n* give the smart contract persistent space for its own data.\n\nLaunching a smart contract is simply sending the program as data to address zero.\n\n```\n{\n   From : Dave\n   To : <this space intentionally left blank>\n   Value : 100\n   Data : \"aProgramExpressedAsLoadsOfHexadecimalDigitsSpatOutFromACompiler\"\n  Signature : plugh\n}\n```\n\nOnce this transaction is sent, a contract is deployed. The Transaction Hash returned will yield the contract address.\n\n![contract in storage.png](https://steemitimages.com/DQmYtFR5D7JXw6PRR6pz2NVvB7bhXDXVNNxQVB8FwjovqAM/contract%20in%20storage.png)\n\n\nStructure of a smart contract\n---\n\nAt first glance, smart contracts can be thought of as being something like the object that we have used in various other programming languages. A mixture of algorithms and data. The algorithms are expressed as functions. \n\nData can be \n* State Variables\n* Local variables\n\nState variables are visible inside the contract and are persistent. These form the data in the image above.\nLocal variables are only visible inside a particular function and are either declared as parameters or inside that function.\n\nInteracting with a contract\n----\n\nWhen you interact with a smart contract you call its various functions and provide the necessary data. There are two distinct types of call.\n* Calls that modify state variables\n* Calls that simply request information\n\nAs mentioned before, every time you post a transaction, the transaction is put into a block and disseminated among the nodes. This means that\n* Every node has exactly the same view of your contract's state\n* A transaction takes time to be mined and disseminated through the network\n\n* A call that modifies state variables needs to be mined and disseminated (slow)\n* A call that simply requests information can be handled by a request to your local node (fast) because your node must agree with all other nodes.\n\nTransactions are executed in the sequence that they are ordered in a block. The only way one transaction interacts with another is by the state they leave contracts in.\n\nNow you have some basic ideas, in the next episode we will move on to creating our first contract.",
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      "memo": "Hello daveappleton. I Followed you.If you follow me, I'll be happy.Thanks :)"
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      "parent_permlink": "blockchain",
      "author": "daveappleton",
      "permlink": "ethereum-from-the-ground-up-part-i-blockchain-basics",
      "title": "Ethereum from the ground up - Part I : Blockchain Basics",
      "body": "Introduction\n--\n\nSince joining HelloGold I have been promising to develop some course material to train new ethereum developers.\n\nWe have, of course, been so insanely busy delivering a product then running a token sale that the teaching has had to be put on hold with the exception of running a couple of conferences but with 2018 looming it is time to get ready to deliver.\n\nMy teaching style\n---\nI teach at a number of levels but I believe that if you understand what is going on under the hood, you will understand the rest a lot better. That being said, I only cover enough of the details to de-mystify and make things understandable. And I never teach it if I do not understand it. So let's start with the basics.\n\nDon't worry. We will be writing smart contracts soon enough.\n\nWhat is a transaction in a blockchain context?\n---\n\nA blockchain should be an open, immutable, repeatable record of the interactions that led us from a previous genesis state to a current state. Each interaction is a transaction.\n\nTransactions\n---\nA transactions is the fundamental record of a blockchain.  In early blockchains which represented a store of values, a transactions depicted a transfer of that value. In later blockchains the data carried in a transaction may be more  important than any value.\n\nexample :\n```\n{\n   From : Dave\n   To : Alice\n   Value : 100\n   Data : \"Happy Birthday Alice. Buy yourself something nice\"\n}\n```\n\nThis theoretical instruction would send 100 coins from me to my dear friend Alice - but there is not a lot of proof that I read it. And what is to stop Alice, at a later date from changing the 100 to 1000?\n\nWe need a two part solution\n\nEnter the Hash Function (part 1)\n---\n\nThe hash function is well known way to guarantee the integrity of data. Most programmers will know of them as a way to prove that a password is valid without actually storing the password. \n\nA hash function reduces a piece of data to a number, but a number that changes dramatically for a small change in the data.\n\nUsing the Keccak 256 function we reduce any number to a 256 bit number. \n\nThe transaction above converts to : \n`7487306b743291719ee02a6ee15330a1f5a9fcd4a1702da1f8d51aa3f2003bc3` \nbut if Alice were to change the 100 to 1000 we get `8b43bdfb7ece3f543c5435089150c07f75471d3f9aac1b1c59f2772963ee8f2f`\n\nEncrypting it (part 2)\n---\nAll this means is that Alice would need to generate a new hash value if she wants to change the data but public key encryption provides the second part of the solution. We are not going to touch the transaction itself - we need that to be public. We encrypt the hash value so that only I can create it but anybody can verify it.\n\nWe generate a `private key` using a random number function. From this we drive a `public key` such that data encrypted with the private key can only be read using the public key.  \n\nData encrypted with the private key can be read using the public key - but the only the specific private key can do the encryption.\n\nSo I have to communicate my public key. How?\n\nBoth the private and public keys are unique. This means that I can use my public key as my ID so that the transaction would now read\n\n```\n{\n   From : 0x97202b21c749b1cbf2b7bbbf23a6c60205b29e1f\n   To : 0x31EFd75bc0b5fbafc6015Bd50590f4fDab6a3F22\n   Value : 100\n   Data : \"Happy Birthday Alice. Buy yourself something nice\"\n   Signature : 3ccbef9b961398f44b3cc3d3539105a9f988361ed7e0b050007ff49cb930acc2\n}\n```\n\nI am going to admit that I faked the signature - (just used the hash) but in a real system a user would decrypt the signature and compare it to the hash that they get themselves with the data that they see.\n\nThe combination of public key encryption and hashes creates a digital signature that proves that a piece of electronic data is genuine so we have an un-fakeable transaction record. Alice gets 100 coins. Lucky Alice.\n\n![Signatures.png](https://steemitimages.com/DQmckBfK2BqgnizjvgQZSor3DovMmX5VQxmodgPoKyorh4y/Signatures.png)\n\nA load of transactions grouped together is a block\n---\n\nThe record of me giving Alice 100 coins would not be very credible if Alice just printed it and stuck it on her fridge.\nI submit that transaction to the blockchain network so everybody knows about it.\n\nWithout going into the whole mining thing, people all over the network are assembling available transactions into `blocks` that link to previous blocks. To ensure that these blocks do not get altered, each block (including a link to the preceding block) is also signed by the person who assembles it. They then distribute that block to the rest of the network. The network votes on whether to accept it. The first valid block usually wins.\n\nSo each person on the network end up with a linked list of signed blocks made up of signed transactions. Each person's list is identical.\n![Blockchain.png](https://steemitimages.com/DQmQGKVpr2bDrNaUZzBJ4S6iYDL6ryQv6Pp3R5HhbmSKXZv/Blockchain.png)\nWhich is pretty much a distributed, audited, set of accounts - also known as a distributed ledger.\n\nTo find out your balance, you can simply apply each interaction in turn and watch your changing fortunes over time until you finally see your current net worth.\n\nComing up next : What makes ethereum so special ?",
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      "title": "Staying safe with MyEtherWallet & Metamask",
      "body": "There are soooo many scams on slack channels - and way too many are aimed at getting you to go to fake MyEtherWallet web sites.\n\nThis is probably because of the fanatical effort put in by Kevin and Taylor to build an amazing online wallet that\n\n* Works in your browser (your keys stay on YOUR computer)\n* Has incredible community support (because it is so damn good)\n* Develops really fast to satisfy your every need (crypto related of course)\n* Doesn't cost anything to use\n* Is used by a huge percentage of the ethereum community\n\nAnd, if you have ever inhabited a slack community you are bound to have received a message like this :\n\n![](https://steemitimages.com/DQmNwXmswJkKHszwVKPSuH1rgPWWEeq8RgnPH7ddrRLHPy4/image.png)\n\nYou may also get messages advising you to set up 2FA (which, were it not a scam, would be a joke because you never have to log into MyEtherWallet) or all kinds of other tricks to get you to go to a fake MyEtherWallet.\n\nSome are really well disguised. Like this one :\n\n![](https://steemitimages.com/DQmez3AvzDT26G7MyfmioMYK7fiKfrLqEVMpK9d8Ej8sdFj/image.png)\n\nI thought that there was a smudge on my screen - but I know not to click on links except to check that they are already reported in either Metamask or EtherAddressLookup.\n\n----\n\nAll of these scams are trying to get access to the keys of your ethereum account. The same key that MyEtherWallet carefully ensures do not leave your own computer.\n\nThe best way to stay REALLY safe is to never even give your keys to MyEtherWallet (not even the real one).\n\nThere are two ways to do this - the cheap way and the not so cheap way.\n\nThe cheap way is to install Metamask. A cool in browser wallet with limited features.\n\n* Send ether\n* Call contracts IF YOU ARE AN ETHEREUM WIZARD\n* Inject Web3js into webpages\n\nThe second one is not easy. And while they show you your tokens, you can't send them from Metamask without satisfying the second condition (you need to be able to create ABI code)\n\nBut the third item allows you to use MyEtherWallet to send from your Metamask account - but you sign the transaction inside Metamask. Even a fake MEW cannot access your keys as long as you do not export them from Metamask.\n\n![](https://steemitimages.com/DQmPEnGpBsAEE3AtGgEX92x8jUJwC1kdbRqJBgTcp67QwRc/image.png)\n\nAssuming you have tokens in Metamask\n\n![](https://steemitimages.com/DQmPFSStp7TFgXUYDEjQnQVR97EXd7aLAX2MgojmjZGK1Sq/image.png)\n\nYou can send the balance using MEW\n\n![](https://steemitimages.com/DQmXrxwWETyLHahSqzu1wNXGcHwWpJuCVNEJs3wuSCd2F2C/image.png)\n\nGenerate the transaction\n\n![](https://steemitimages.com/DQmaJwYvWkMfiGVr15TDCJp41UvwoxmmNWKKjTj73EuaUAJ/image.png)\n\nClick send\n\n![](https://steemitimages.com/DQmS9FJKtZD1Ag3Tf1rwHuLXDDmtCejY4nqHZN4PgUfyazk/image.png)\n\nAnd now, to sign, Metamask takes over...\n\n![](https://steemitimages.com/DQmdiZ97pnuoTzv7bJd1iC6M8S3c92CZP6cMDDYad2yxJSx/image.png)\n\nOnce you have done that MEW gives you the usual link to the transaction on Etherscan.\n\n-----\n\nAbout Me : Dave Appleton \nI develop smart contracts and Go Code for HelloGold",
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      "title": "Wanna lose your Ether and Tokens?",
      "body": "Didn't think so. Pay attention.\n\nUntil we manage to move away from Slack to a new platform (and even after that probably) there will be people trying to separate you from the contents of your ethereum wallet.\n\nThere are three common scams going on at the moment\n\n1. scaring you to go to a fake myEtherWallet address.\n2. asking you to send ether to an accelerator program\n3. a fake ICO site for 'early access' or 'airdrop' etc.\n\nFor all of them you must first be careful and not click on links but #1 and #3 are really nasty because they usually try to get your private keys (or wallet file and password) and then drain all your ether AND TOKENS.\n\nThe first line of defence is to advise you to install Metamask and EtherAddressLookup because they seem to catch 99% of all bad sites.\n\nTake this site : https://tenxpay[.]io/airdrop (fake site - don't visit)\n\nWith Metamask :\n\n![](https://steemitimages.com/DQmZrUx7tynipWRK4xkm1TY1XMJTF7XMh9Mdif9zAGEC841/image.png)\n\nwithout :\n\n![](https://steemitimages.com/DQmaXXhccxkCnXZ8db3eaZUCoLHJmrMP8diTyTHNYMcrX6E/image.png)\n\nwhich when you submit it - asks you for your private key !!!\n\n![](https://steemitimages.com/DQmNwnA3grmf3Bn1kbZD1BDYssdsof3AFSPMFG5LmXd6ztY/image.png)\n\nIf you give your private key - you will wake up to find all your ether gone.\n\nInstall Metamask and EtherAddressLookup - both Chrome Extensions and both free.\n\nNext Up - protecting yourself from fake MyEtherWallet sites",
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      "title": "Hung up on missing parentheses...",
      "body": "Back in 1980 when I had just graduated, while I was waiting to start work, I took a small (!) project from the owner of the local computer store - who also happened to own the car accessories store next door.\n\nWhat he wanted (and I was dumb enough to offer to implement) was a database of parts running on a first generation TRS 80, powered only by cassette tapes. The only available language was a Z80 assembler, but heck, I was a whiz with 8080 and Z80 coding so how hard could it be?\n\nArmed with a bottle of the best Bells Whisky I started coding in my living room, working into the night, and, to my best recollection the code was pretty good considering the constraints. I built, from first principles a rudimentary database that could be loaded from cassette and changes saved. Nothing fancy like indexing, trees or anything but it worked.\n\nThe one night that I was almost defeated was by a quirk in the assembler.\n\nIn Z80 code, general purpose registers are known by letters, A, B, C, D, E, H and L.\n\nThe D & E registers can be combined to form a pair used for indexing memory as can the H & L registers.\n\nSo I had a loop that used the DE register pair to index the memory and I was looking for the end of line character.\n```\nloop:\tld a,de\n\t\tcp 0d\n\t\tjr z,found\n\t\tinc de\nfound:\t...\n```\nHaving only the most primitive of debuggers it took me about half the bottle to realise that the first line was not (as I had intended) using the DE register pair as an index, but rather was loading the hexadecimal value DE into the A register, hence the next line - comparing the A register to the value 0d (end of line) could never be satisfied and an eternal loop had been created.\n\nFour hours later I finally had the corrected code\n\n```\nloop:\tld a,(de)\n\t\tcp 0d\n\t\tjr z,found\n\t\tinc de\nfound:\t...\n```\nBut oh how much easier it would have been if modern coding conventions had dictated that hex numbers should start with 0x.\n```\nloop:\tld a,0xde\n```\nOr used the convention then in use, following hex numbers with the letter H\n```\nloop:\tld a,deh\n```",
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