{
  "block": 36596776,
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    {
      "amount": "0.001 HIVE",
      "from": "dtube",
      "memo": "DTube Coin Round #1 is live! Visit https://token.d.tube for more information",
      "to": "sparkster"
    }
  ],
  "op_in_trx": 43,
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      "amount": "0.001 HIVE",
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      "memo": "Final call to claim your DTube account! It takes only 5 minutes. Go now to https://d.tube",
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      "author": "sparkster",
      "body": "We are pleased to announce that SPRK will soon be listed on **LAToken**. Please wait for the official announcement from LAToken for deposits commencement before attempting any transfers. http://bit.ly/2PoK2Cq\n\n**Tokens will unlock on Monday September 2nd 2019 at 10am UTC.**\n\n![](https://cdn.steemitimages.com/DQmVYpwCyDqKA3joMyEVDetkPhtk4rUv4NP7mzvE7ySHnkc/image.png)\n\n**Further information from LAToken:**\nLATOKEN is a Top-20 crypto exchange focusing on providing liquidity for new tokens: \n\n●   $1 bn+ daily turnover \n●   400 k+ registered traders \n●   450+ crypto pairs available for trading Besides crypto trading, \n\nLATOKEN users can participate in selected IEOs at pre-sale and crowd sale stages. http://bit.ly/2PoK2Cq",
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      "parent_author": "",
      "parent_permlink": "sprk",
      "permlink": "sprk-is-coming-to-latoken",
      "title": "SPRK is coming to LATOKEN"
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{
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      "author": "sparkster",
      "body": "Team tokens have been locked in the smart contract until June 6th 2021 10pm. We have no ability to change this date, unlock them prior to this date, or use these tokens in any capacity any sooner than this date. \n\nThe contract is also a multi signature contract and each signature is protected by hardware keys, so no single party can unilaterally execute any function on the contract.\n\n<center>![](https://cdn.steemitimages.com/DQmTAciExJwCD9QW1iwARs3wHuBTYTWptCHzQrJU3E5XLhk/image.png)</center>\n\nYou can verify the teams locked tokens with the following procedure:\n\n**Step 1:** Navigate to: https://etherscan.io/token/0x80a740c8ffa28c8c2c3f1fc8b6c1a0a442212e71#readContract\n\nScroll Down to section *’31: getGroup’*\nIn the *’groupNumber (uint256)’* field, enter 1 and press *‘Query’*\n\n\n![](https://cdn.steemitimages.com/DQmWvd3yWgML8HFuNVFBLsoAjDZRcAj3ksZnSBTvqN1gYXk/image.png)\n\nNotice this group is called **Locked Tokens** \n\n**Step 2:** Next, we will determine the unlock date of Group 1\n\nOn the same page, scroll up to section *’7: getGroupUnlockTime’*\n\nIn the *’groupNumber (uint256)’* field, enter 1 and press *‘Query’*\n\nThe function will return a value of 1623016800\n\n![](https://cdn.steemitimages.com/DQmNTQta7umWZfVPfwU6sWcKh5d61eakJJmegKR4B3UT4yW/image.png)\n\nNext, navigate to: https://www.unixtimestamp.com\n\nCopy and paste this value into the *’Enter a Timestamp’* field on this page, and click *’Convert’*.\n\n![](https://cdn.steemitimages.com/DQmPGuyQr4fQxmYnJpe6ioPUfCc29RjcHRUz1DbEouK38VY/image.png)\n\nNotice that this Unix Time Stamp corresponds to June 6th 2021 at 10pm.\n\n![](https://cdn.steemitimages.com/DQmfG9VEnVKWgtCiKDBsK734GUEaCE4Axja4MUgm7jfDgbs/image.png)\n\n**Step 3:** Finally, we will see how many tokens have been locked, and which wallet address has been locked. \n\nScroll to section *’15: getLockedTokens’*\n\nIn the *’walletAddress (address)’* field enter: 0x8a26B989880CB06d18411C0Cd9C3fa960FDACA51 and click *’Query’*\n\nThe quantity returned corresponds to the entire allocation of the team and initial investor tokens, as per our whitepaper. \n\n![](https://cdn.steemitimages.com/DQmWTo4ZVrvko19Z5dkoJXpzaEghKTHXD554TAN8Fy4Rrf1/image.png)",
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      "title": "Team tokens are locked by Smart Contract until June 2021"
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{
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  "op": [
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    {
      "author": "sparkster",
      "body": "@@ -529,16 +529,109 @@\n okens.%0A%0A\n+!%5B%5D(https://cdn.steemitimages.com/DQmY5YYDJqPoMnwjHzB7Hk6N4E39G54Vmqtas8gmx7XoBUp/image.png)%0A\n %0A%3Cb%3EStep\n",
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      "parent_author": "",
      "parent_permlink": "sparkster",
      "permlink": "sprk-token-swap-procedure-for-myetherwallet",
      "title": "SPRK Token Swap Procedure for MyEtherWallet"
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{
  "block": 35857519,
  "op": [
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    {
      "author": "sparkster",
      "body": "It has come to our attention that some people are receiving the following error after calling the swapTokens function:  Warning! Error encountered during contract execution [Bad instruction]\n\nThis error occurs if you have approved more tokens in the *'increaseApproval'* function than you actually hold in your wallet. Even If the approved quantity is slightly more than the number of tokens you own, the function will throw an error, by design, to prevent you from receiving more tokens than you own. \n\n**You can easily correct the problem, by transferring your tokens to a new wallet, and following the previous token swap guidelines very carefully.** \n\nAlternatively, if you do not wish to transfer the tokens, please follow the steps below. The steps below will also help you understand why the error occurred.\n\n![](https://cdn.steemitimages.com/DQmUq7jLhN4PdQD96zyE2BaC1UMKTKEuk8zQqM7x7knTx6s/image.png)\n\n**Step 1: Validate the number of tokens you have authorized to transfer.**\n\nVisit: https://etherscan.io/token/0x971d048e737619884f2df75e31c7eb6412392328#readContract\n\nScroll down to very bottom, to item number *‘20: allowance.’*\n\nIn the *‘_owner (address)’* field, enter **your** wallet address where **you hold SPRK.**\n\nIn the *‘_spender (address)’* field, enter the address of the new contract: 0x80a740c8ffa28c8c2c3f1fc8b6c1a0a442212e71\n\nThen click *‘Query’*\n\n<center>![](https://cdn.steemitimages.com/DQmZ1tcByfC1rcZQDcuEzPrJ9MnsAErMxEuseU2mW9XUeWo/image.png)</center>\n(The example wallet used in this guide was provided to our support team and belongs to a token holder, this wallet is only being used for demonstration purposes).\n\n**Step 2: Validate the quantity from Step 1 is less than or equal to the number of tokens in your wallet.**\n\nCopy the quantity from above.\n\nGo to: https://etherconverter.online/\n\nPaste the value into the *‘Wei’* field, and note down the quantity in the *‘Ether’* field.\n\n<center>![](https://cdn.steemitimages.com/DQme4PAg3d4xi9Y6urgHKAEDtQ6uCZqjrFdL5vMy5t54exR/image.png)</center>\n\nNow go to your wallet, and validate the quantity of tokens you hold is either equal to, or less than the quantity in the *‘Ether’* field. \n\nThe example wallet holds 4077.78 SPRK tokens. Because the quantity that has been approved to transfer via the *’increaseAllowance’* function (4078 in the example above) is greater than the quantity of tokens held in the wallet (4077.78 in this example), the function has retuned an error, by design, even if it is only slightly more.\n\nIf the authorized quantity from step 1 is greater than the quantity of tokens you hold, continue to step 3 to correct this. \n\n**Step 3: Set the approved quantity to zero.**\n\n**Instructions for MyEtherWallet are below,** for MetaMask scroll down.\n\nAfter you have accessed your wallet via MEW, click on *’Contract’*, then *‘Interact with Contract’* from the left hand menu. \n\nIn the *‘Contract Address’* field, enter: 0x971d048e737619884f2df75e31c7eb6412392328\n\nIn the *‘ABI/JSON Interface’* box, enter:\n\n    [{\"constant\":false,\"inputs\":[{\"name\":\"_spender\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]\n<br>\nThen click *‘Continue’*\n\n![](https://cdn.steemitimages.com/DQmRdcQ6WVzHRAU1gQ9bDDi9oFZnR4rux5x7cgvHGLbnyxz/image.png)\n\nOn the next screen, select *‘approve’* from the dropdown menu.\n\nIn the *‘_spender (address)’* field, enter: 0x80a740c8ffa28c8c2c3f1fc8b6c1a0a442212e71\n\nIn the *‘_value (uint 256)’* field, enter: 0\n\nLeave the *‘Value in ETH’* set to 0  \n\nThen click *‘Write’* and complete the transaction as you have in the past.\n\n![](https://cdn.steemitimages.com/DQmYDdqk7TAY3hh4h3JJpYT7R9dCjAWAJGMYV4Qmh5nCFVV/image.png)\n\nOnce the transaction has been confirmed, your approved number of tokens to transfer will have been reset to zero. Go back to the previous set of instructions, and carefully enter the correct amount in Step 1, ensuring the quantity being provided to the *’increaseApproval’* function is less than or equal to the exact number of tokens you hold in your wallet. \n\nThe instructions for MEW can be found here: https://steemit.com/sparkster/@sparkster/sprk-token-swap-procedure-for-myetherwallet\n\n**Instructions for MetaMask:**\n\ni.\tNavigate to: https://etherscan.io/token/0x971d048e737619884f2df75e31c7eb6412392328#writeContract\n\nii.\tClick *‘Connect to Web3’* next to the red dot, and authorize MetaMask to interact with our contract via etherscan. The red dot will turn green once approved.\n\niii.\tScroll down to section *'2. approve'*.\n\nNext, \n\nIn the *‘_spender (address)’* field, enter: 0x80a740c8ffa28c8c2c3f1fc8b6c1a0a442212e71\n\nIn the *‘_value (uint 256)’* field, enter: 0\n\nThen click the *‘Write’* button\n\n![](https://cdn.steemitimages.com/DQmXQvMX6Eomsyi52LFj3iRxrjiAm6iLS7SVrLmLUxPfpYj/image.png)\n\nIn the MetaMask window that appears, click *‘Confirm’*\n\n<center>![](https://cdn.steemitimages.com/DQmX3VfCFfEwDQkyGWphkpP7TpsbT9sTY59irbFcQ6TXBWv/image.png)</center>\n\nOnce the transaction has been confirmed, your approved number of tokens to transfer will have been reset to zero. Go back to the previous set of instructions, and carefully enter the correct amount in Step 1, ensuring the quantity being provided to the *’increaseApproval’* function is less than or equal the exact number of tokens you hold in your wallet. \n\nThe instructions for MetaMask can be found here: \nhttps://steemit.com/sparkster/@sparkster/sprk-token-swap-procedure-for-metamask",
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      "permlink": "how-to-fix-warning-error-encountered-during-contract-execution-bad-instruction",
      "title": "How to fix: Warning! Error encountered during contract execution [Bad instruction]"
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{
  "block": 35847135,
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    {
      "author": "cryptoboymano",
      "body": "Guys.. I found a solution for the error you getting. Its bcz you did 2 token contract transaction (i.e) you did the Step 3 twice. To solve this problem, transfer your Spark tokens to a new Ethereum wallet. And do the process 1 time properly. It will work. Its quite annoying till i found this. But finally, someone is doing the team's work here.",
      "json_metadata": "{\"tags\":[\"sparkster\"],\"app\":\"steemit/0.1\"}",
      "parent_author": "sparkster",
      "parent_permlink": "sprk-token-swap-procedure-for-myetherwallet",
      "permlink": "pwrol5",
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      "author": "hta79",
      "body": "I went to step 8, I need to send a transaction, but failed, I tried many times.\n![sprk2.png](https://cdn.steemitimages.com/DQmS638FdwTPxPqJHLAvv2X7fo3Kud8PEueXT8R1tV6XUFK/sprk2.png)\n\nplease help me",
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      "author": "kuilef",
      "body": "On Step 7 I have an error:\nError: Error: Error: [ethjs-rpc] rpc error with payload {\"id\":2457492671024,\"jsonrpc\":\"2.0\",\"params\":[\"0xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\"],\"method\":\"eth_sendRawTransaction\"} {\"code\":-32000,\"message\":\"transaction underpriced\"}\nwhat should I do now?",
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      "body": "Have the same error on step 5 - The execution failed due to an exception. Do you have any support guys? I wrote to @Shekhar_Saurabh thru Telegram and Telegram group as well - no any answer.",
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      "body": "Is it possible that there is any mistake with the contract or something? I've tried to run the instructions and at step 7, at 300,000 Gas limit, it says that there is some error during execution.\nAny advice for it?\n\nThank you in advance!\n\nPS: At 21,000 Gas limit, the transaction runs out of gas... \nPPS: I've used the old MyEtherWallet.",
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{
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      "author": "steemitboard",
      "body": "Congratulations @sparkster! You have completed the following achievement on the Steem blockchain and have been rewarded with new badge(s) :\n\n<table><tr><td><img src=\"https://steemitimages.com/60x70/http://steemitboard.com/@sparkster/posts.png?201908201359\"></td><td>You published more than 30 posts. Your next target is to reach 40 posts.</td></tr>\n</table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@sparkster) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=sparkster)_</sub>\n<sub>_If you no longer want to receive notifications, reply to this comment with the word_ `STOP`</sub>\n\n\nTo support your work, I also upvoted your post!\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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      "author": "cebuladeals",
      "body": "Hi [sparkster](https://steemie.pw/@sparkster), did you know you can also view this post on [Steemie](https://steemie.pw/post/@sparkster/sprk-token-swap-procedure-for-myetherwallet)?\n\nI'm a bot, if you do not want these messages under your posts - just reply STOP :)\n\n\n*Ads (powered by Steemie)*\n\n<a href=\"https://brave.com/ste259\"><img src=\"https://static.bombsite.be/brave-eng.png\"></img></a>",
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      "title": "RE: SPRK Token Swap Procedure for MyEtherWallet - sparkster view your post on Steemie.pw"
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      "body": "The token swap procedure is simple to execute in just a few steps, and will only take a few minutes. To get started, you will need to be able to access the wallet that holds your SPRK tokens via MyEtherWallet, and a small amount of ETH in that wallet.\n\nIf you have a MetaMask wallet, we recommend our simpler token swap instructions for [MetaMask](https://steemit.com/sparkster/@sparkster/sprk-token-swap-procedure-for-metamask). The new tokens will be locked until September 2nd 2019 to allow everyone sufficient time to swap tokens.\n\n\n<b>Step 1:</b> First calculate the <i>‘Wei’</i> quantity of the number of tokens you wish to swap. To do this, navigate to https://etherconverter.online. In the <i>‘Ether’</i> field, type in the number of tokens you wish to swap.\n\nFor example, if you wish to swap 100 SPRK tokens, you would type in 100 in the <i>‘Ether’</i> field. Copy and paste the <i>‘Wei’</i> value that is generated into a document. You will need this quantity in a Step 4.\n\n![](https://cdn.steemitimages.com/DQmTCzHvTXtSEeD2htcQEN6UHbxRUMcC1vRnFsS3JAnZ7W6/image.png)\n\n<b>Step 2:</b> Once you’re logged into MyEtherWallet, click on <i>‘Contract’</i> in the left hand menu, then click on <i>‘Interact with Contract’.</i>\n\nIn the <i>‘Contract Address’</i> field, paste: 0x971d048e737619884f2df75e31c7eb6412392328\n\nIn the ‘ABI/JSON Interface’ box paste:\n\n    [{\"constant\":false,\"inputs\":[{\"name\":\"_spender\",\"type\":\"address\"},{\"name\":\"_addedValue\",\"type\":\"uint256\"}],\"name\":\"increaseApproval\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]\n<br>\nThen click <i>‘Continue.’</i>\n\n![](https://cdn.steemitimages.com/DQmUDzNVFWHnXRUL1bth783RRSUzbqdNecsXVxBMaj1c4xv/image.png)\n\n<b>Step 3:</b> From the <i>‘Select an item’</i> dropdown, select <i>‘increaseApproval.’</i>\n\nIn the <i>‘_spender (address)’</i> field insert the new contract address: ‘ 0x80a740C8FFa28C8C2c3f1fc8b6c1A0A442212E71’.\n\nIn the <i>‘_addedValue (uint256)’</i> field insert the Wei quantity of tokens from Step 1. In this example, 100 SPRK tokens, that is 100000000000000000000.\n\nLeave <i>‘Value in ETH’</i> at 0 as you are not transferring any value.\n\nThen click <i>‘Write’</i>\n\n![](https://cdn.steemitimages.com/DQmYKX2K2xS3FBpaZU5iiWALdoi18SWoc22aXoYeeKmZVuJ/image.png)\n\n<b>Step 4:</b> Follow the steps you would typically follow for a payment transaction to complete the transaction. We have not provided the specific steps as they vary by the type of wallet you have. For example, the steps for a hardware wallet are different to the steps for a software wallet. You should be familiar with these steps if you have used MEW to transfer funds between wallets.\n\n<b>Step 5:</b> Once your transaction has been confirmed on the Ethereum network, go back to MyEtherWallet, in the menu click on <i>‘Contract’</i> and <i>‘Interact with Contract’</i> again.\n\nIn the <i>‘Contract Address’</i> field, paste: 0x80a740C8FFa28C8C2c3f1fc8b6c1A0A442212E71\n\nIn the ‘ABI / JSON Interface’ box paste:\n\n    [{\"constant\":false,\"inputs\":[],\"name\":\"swapTokens\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]\n<br>\n\nThen click ‘Continue.’\n\n<b>Step 6:</b> From the <i>‘Select an item’</i> dropdown, select <i>‘swapTokens.’</i>\n\nLeave <i>‘Value in ETH’</i> at 0 as you are not transferring any value.\n\nThen click <i>‘Write’</i>\n\n![](https://cdn.steemitimages.com/DQmeYnpS1gHrDbhpXBYWrUZYGMx7WwZ9XU2Ew9f9vkGM3Pn/image.png)\n\n<b>Step 7:</b> Follow the steps to complete the transaction, in the same way you would complete a payment transaction.\n\nThat’s it! Your tokens have been successfully swapped.",
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      "author": "sparkster",
      "body": "The token swap procedure is simple to execute in just a few steps, and will only take a few minutes. To get started, you will need have MetaMask setup with the wallet that holds your SPRK tokens, and a small amount of ETH. The new tokens will be locked until September 2nd 2019 to allow everyone sufficient time to swap tokens.\n\n![](https://cdn.steemitimages.com/DQme4k2Ufpbijf1U1RVoft77M7VBeTURDR4CEzVtCYSoXn3/image.png)\n\n<b>Step 1:</b> First calculate the <i>‘Wei’</i> quantity of the number of tokens you wish to swap. To do this, navigate to https://etherconverter.online. In the <i>‘Ether’</i> field, type in the number of tokens you wish to swap.\n\nFor example, if you wish to swap 100 SPRK tokens, you would type in 100 in the <i>‘Ether’</i> field. Copy and paste the <i>‘Wei’</i> value that is generated into a document. You will need this quantity in a Step 4.\n\n![](https://cdn.steemitimages.com/DQmbSceVjqXR6Kds2bcSpmf4X7JNHQfmehQZhHKL4fPf8pF/image.png)\n\n<b>Step 2:</b> Navigate to the existing contract at https://etherscan.io/address/0x971d048e737619884f2df75e31c7eb6412392328#writeContract\n\n<b>Step 3:</b> Next, click on the <i>‘Connect to Web 3’</i> next to the red dot. MetaMask will appear and ask to confirm that you wish to connect your wallet to the contract. Click <i>‘Connect.’</i> You will be then be prompted with a notification message, click <i>‘OK’.</i>\n\nIf you are not logged into MetaMask, it will ask you log in, then the red dot will turn green.\n\n![](https://cdn.steemitimages.com/DQmSrBthLi43VLySRmpSvJqHqHak2eLxZrgoKfVEiRWT7t5/image.png)\n\n<b>Step 4:</b> Now, scroll down to to section 30, <i>‘increaseApproval’.</i>\n\nIn the <i>‘_spender (address)’</i> field insert the new contract address: ‘ 0x80a740C8FFa28C8C2c3f1fc8b6c1A0A442212E71’.\n\nIn the <i>‘_addedValue (uint256)’</i> field insert the Wei quantity of tokens from Step 1. In this example, 100 SPRK tokens, that is 100000000000000000000.\n\nThen click <i>‘Write’</i>\n\n![](https://cdn.steemitimages.com/DQmUeTMmuJvQJaP5S4iBAjFbx6X5JCKhyCL3iGUtjc1qL5k/image.png)\n\n<b>Step 5:</b> You will now see a transaction window appear in MetaMask. The transaction will be of zero value. Click <i>‘Confirm’</i> in the MetaMask window.\n\nIn Etherscan, a button will appear called <i>‘View your transaction.’</i> Click on this to view the status of your transaction. You will need to wait till your transaction is confirmed, before continuing to the next step.\n\n<center>![](https://cdn.steemitimages.com/DQmWaHMF4d6CawBHvTXJnRm4waeBgbepk2bwkowzP1j8eUW/image.png)</center>\n\n<b>Step 6:</b> Once your transaction has been confirmed, navigate to the new contract in etherscan by clicking here: https://etherscan.io/address/0x80a740C8FFa28C8C2c3f1fc8b6c1A0A442212E71#writeContract\n\n<b>Step 7:</b> Click on the <i>‘Connect to Web 3’</i> next to the red dot, just as you did in step 3, and click the <i>‘OK’</i> button again when the notification appears. The red dot will turn green.\n\n<b>Step 8:</b> Scroll down to section 20 titled <i>‘swapTokens’</i> and click the <i>‘Write’</i> button. This will bring up another zero value transaction in MetaMask. Click <i>‘Confirm’</i> in the MetaMask window, just as you did in step 7.\n\nThat’s it! Your tokens have been successfully swapped.",
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      "author": "steemitboard",
      "body": "Congratulations @sparkster! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/https://steemitboard.com/@sparkster/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@sparkster) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=sparkster)_</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": "ICO Investors Threaten Legal Action Against Sparkster | #VentureCanvas\nhttps://www.venturecanvas.com/2019/03/21/ico-investors-threaten-legal-action-against-sparkster-venturecanvas/",
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      "author": "partiko",
      "body": "Thank you so much for sharing this amazing post with us!\n\nHave you heard about Partiko? It’s a really convenient mobile app for Steem! With Partiko, you can easily see what’s going on in the Steem community, make posts and comments (no beneficiary cut forever!), and always stayed connected with your followers via push notification!\n\nPartiko also rewards you with Partiko Points (3000 Partiko Point bonus when you first use it!), and Partiko Points can be converted into Steem tokens. You can earn Partiko Points easily by making posts and comments using Partiko.\n\nWe also noticed that your Steem Power is low. We will be very happy to delegate 15 Steem Power to you once you have made a post using Partiko! With more Steem Power, you can make more posts and comments, and earn more rewards!\n\nIf that all sounds interesting, you can: \n\n- Download Partiko Android at [Google Play](http://bit.ly/2SRFIta)\n- Or Download Partiko iOS on the [App Store](https://apple.co/2PcXkSd)\n\nThank you so much for reading this message!",
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      "body": "On December 31st, 2018, we launched our Alpha Main Net. Since then, we have been optimizing and resolving some issues that we have discovered since it’s deployment, some of which we will detail here. The introduction of these enhancements will bring us closer to a stable product.\n\n![nodes.jpg](https://cdn.steemitimages.com/DQmZXux8gDEG1y7UYa5UxZDUFHe8R7TCm1j73VZxHi8uZBw/nodes.jpg)\n\n As mentioned on our GitHub and in various communication media, we use an automated voting process to determine, every hour, the list of active Master Nodes (commonly called M21.) In order to accomplish the automated voting, a node would send its vote to all other Master Nodes, and would simultaneously accept votes from all other Master Nodes, provided open voting was in session. The challenge with distributed computing always is network latency and we saw this manifest among our Master nodes because nodes would only accept votes if they were in the open voting interval. This meant that if a node received a vote just before open voting started for that node, the node would drop the vote.\n\nWe have made the voting process resilient to network latency by allowing the nodes to accept ballots at any time between the close of the last open voting interval and the start of the next voting interval. Ballots remain in memory until the receiving node considers them at the close of the next open voting interval. This solution works because ballots are produced using the timestamp of the left edge of the next voting interval; therefore, no matter at what time a node sends its vote, as long as it signs it using the proper timestamp, that vote will be valid.\n\nAnother challenge in distributed computing is parallelism. We saw this situation when blocks were not being consistently produced. We were getting both duplicate and missing block numbers; in other words, some nodes were ahead of other nodes. So, a single Master Node would only produce blocks where the width between block numbers was equal to the number of master nodes producing blocks. For example, if there were four Master Nodes in existence, each node would produce blocks according to the sequence: {1,5,9,…}.\n\nThese issues were caused by a data race when a new node joined the network. If we relied on every node to publish the current block number to the DHT, there was no way to be sure if the currently published information was current or stale. We chose not to apply a global lock while the new block number was being written to the DHT because of performance penalties, and even global locks are not reliable over a distributed network due to latency.\n\nInstead of recording the current block number, our solution was to record a genesis timestamp in the DHT. This timestamp represents the time at which the first Master Node starts up, thus creating the network. We know that blocks are produced every second, so all a node has to do to find out the current block number is calculate the number of seconds between the genesis timestamp and the current timestamp. The solution also prevented us from having to constantly fetch and push to the DHT every second, reducing load on the network. Once a node fetches the genesis timestamp, there is no need for it to query the DHT again during its lifetime since it can keep track of the block numbers internally.\n\nThe final optimization we have been working on is that of memory. Since the Master Nodes are pushing to the DHT every second and also generating new blocks, over time their memory footprints become large if not managed. Typically, if a program’s memory footprint grows rapidly and in an uncontrolled manner over time, this is known as a memory leak. The program loses access to memory it has allocated and is therefore unable to relinquish that memory back to the operating system.\n\nIn our case, what we were seeing was not a memory leak, although at first glance it definitely looked like one. Throughout our design, we were careful to avoid using pointers as much as possible and to delete them when we were done with them. However, the use of a lot of pointers in a program is discouraged even if memory is managed properly, because heap allocations are expensive; indeed, even with the introduction of smart pointers like std::unique_ptr to prevent us from having to explicitly call delete on a pointer, we still chose to use stack-allocated objects over heap-allocated ones simply because of the performance.\n\nThe Master Node’s large memory consumption was caused by two things: firstly, the data structure we used to store blocks was growing infinitely large; and secondly, memory used by OpenDHT was also growing infinitely large.\n\nWe made our first enhancement to the memory footprint by “force-deallocating” the data structure where we store blocks, and changing its datatype. Previously, it was using the std::unordered map type, a hash map implementation in C++. The problem with unordered map is that its allocations are sparse to allow for constant-time operations. This means that the std::unordered map type is, by nature, very large. So, we switched the data structure to use std::map instead of std::unordered map. The map structure allocates a contiguous block of memory and in some cases outperforms the hash map because of its smaller size. However, we determine that for block storage we simply did not need a hash map because block fetches (done by the client) were not time-critical, so using a hash map here was an unnecessary waste of resources for little to no realized performance benefits.\n\nOnce we switched the data structure to std::map, we cleared the memory of the map not only by calling clear after a sufficiently large amount of blocks has been written, but also by swapping the memory of the map for that of an empty map. While we were doing this for the unordered map as well, we saw no benefits since unordered map has such a large start-up memory footprint. It was necessary to swap with an empty region of memory because calling clear doesn’t necessarily de-allocate the memory held by the data structure; it only de-allocates  individual items from the map. However, if we swap the memory held by the map with that of an empty map, we can be sure we’re starting with a truly empty map.\n\nThe second thing that was contributing to the large memory footprint of the Master Node was OpenDHT. Every node writes the block hash to the DHT so that a new node that has just joined the network can know where to start from. Since every node was writing to the DHT every second, all the collective values were beginning to occupy a large amount of memory which was only growing as more and more values were written to the DHT. Considering this, we set the expiration time of messages to be no more than thirty seconds (as opposed to the default ten minutes.) This configuration allows stale values to be dropped and to not be unnecessarily retained in memory, since most of the time we only care about the latest value. Our analysis on OpenDHT showed that, as expected, the library modified the size of its data structure appropriately and handled deallocation itself as values fell off of the expiration interval, keeping the size of the overall memory footprint small and tightly managed.\n\nAlong with these performance enhancements, we have also made adjustments (mostly to the Master Node) to make sure it performs quickly to keep up with the block production rate. Some of these changes include removing areas where we were unnecessarily acquiring locks and performing expensive operations that didn’t need to be performed in every block production, such as calculating the base-64 encoded string of the node’s public key. 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