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      "body": "Congratulations @aleixmorgadas! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@aleixmorgadas/birthday3.png</td><td>Happy Birthday! - You are on the Steem blockchain for 3 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@aleixmorgadas) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=aleixmorgadas)_</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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      "permlink": "why-nem-authenticator-is-important-to-give-security-and-keep-the-power-in-the-user-hands",
      "title": "NEM Authenticator vs common \"Authenticator\" applications. Why NEM Auth keeps the power and responsibility on NEM users hands.",
      "body": "![logo-extended-1200x335-white-bg-roboto.png](https://steemitimages.com/DQmUZyHqJKc6KhNAvCuDv9fnJKFrs14Uh2o7XX3TD4mz77k/logo-extended-1200x335-white-bg-roboto.png)\n\n«NEM Authenticator is a 100% decentralized 2 Factor Confirmation system to use NEM Blockchain and secure your account assets from being stolen using the NEM Blockchain native features.»\n\nThe _Authenticator_ name is because it behaves similar to other similar apps like Google Authenticator, but it should be named _NEM Confirmator_ to be exact.\n\nI would like to analyse the differences between Google Authenticator (and similar apps) with NEM Authenticator. \n\n### What does Google Authenticator? \n\nLet's check what [Wikipedia](https://en.wikipedia.org/wiki/Google_Authenticator) says:\n\n> Google Authenticator is a software token that implements two-step verification services using the Time-based One-time Password Algorithm (TOTP) and HMAC-based One-time Password Algorithm (HOTP), for authenticating users of mobile applications by Google.\n> \n> Authenticator provides a six- to eight-digit one-time password which users must provide in addition to their username and password to log into Google services or other sites.\n\nSo, using Google Authenticator, we can enable a two-step verification to authenticate ourselves in third party software, usually web pages, and keep our accounts securer since it requires our login credentials (email and password) and a one-time password given by Google Authenticator.\n\nOnce you are logged into the web page, you can navigate and do whatever you want as a logged user. But, when we are in a Blockchain environment, you just need the private key to initialize transactions, how could you protect yourself validating the transaction you want to send twice using different devices?\n\n### What does NEM Authenticator?\n\nNEM Authenticator is a mobile application that fetches the unconfirmed transactions from a Multisig Account that needs its approval in order to included in a block.\n\nAuthenticator provides a list and detailed transaction details so the owner can check it it is the transaction he/she has initialized is legit. \n\nIn case the NanoWallet account is compromised, the stealer still needs the NEM Authenticator confirmation in order to steal the assets.\n\nObviously, **do not confirm a transaction that you have not initialized**. \n\n### Why combining Google Authenticator and NEM Authenticator is not possible?\n\nSince Google Authenticator allows you to login in some web page, it means that the private key is managed by a third party. It implies the control of the assets are delegated to someone else rather than the nem multisig account owner. \n\nThe goal of NEM Authenticator is keep the responsibility and the power to the owner as much as possible, in this case, the owner has the 100% of the responsibility and the power over its assets since NEM Authenticator does not use any third party software, just NEM Blockchain.\n\n**Be careful using NEM Authenticator in mobile devices that could be compromised with Malware**, since they could steal your wallet credentials and wallet file, giving the attacker the power of the confirmer account. The attacker still needs to control another account, but better to keep all devices clean of Malware.\n\n### Why is this possible?\n\nNEM Blockchain has the [Multisig Account feature](https://docs.nem.io/en/other-wallets/iphone-wallet/multisig), In summary, in order to send a transaction from one multisig account to another account, the multisig cosigners  had to agree.\n\nUsing this native feature from NEM Blockchain, we can create NEM Authenticator. NEM Authenticator can be seen as a easy to use mobile application to make the process to send assets easier and less tedious, keeping the security that NEM Blockchain offers. Why? **Because you keep the full control over the private keys**.\n\n![](https://steemitimages.com/DQmcE16UV3FArm5tZcABJYNM6cEysAqFLeXbhyMQcya1gJu/image.png)\n\nIf you want to know more about Multisig, [check this page](https://blog.nem.io/how-to-use-multi-signature-contracts-with-nanowallet/).\n\n- [NEM Authenticator general article](https://medium.com/@aleixmorgadas/nem-authenticator-2fc-ab607513c62d): For all users\n- [How to Setup NEM Authenticator Tutorial](https://medium.com/@aleixmorgadas/nem-authenticator-tutorial-c9755beda3a0): For all users\n- [How NEM Authenticator is made](https://medium.com/@aleixmorgadas/how-nem-authenticator-is-made-6b0b4b1da7c7): For developers\n- [Source Code at Github under MIT License](https://github.com/aleixmorgadas/NEM-Authenticator): For developers",
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      "author": "aleixmorgadas",
      "permlink": "why-nem-authenticator-is-important-to-give-security-and-keep-the-power-in-the-user-hands",
      "title": "NEM Authenticator vs common \"Authenticator\" applications. Why NEM Auth keeps the power and responsibility on users hands.",
      "body": "![logo-extended-1200x335-white-bg-roboto.png](https://steemitimages.com/DQmUZyHqJKc6KhNAvCuDv9fnJKFrs14Uh2o7XX3TD4mz77k/logo-extended-1200x335-white-bg-roboto.png)\n\n«NEM Authenticator is a 100% decentralized 2 Factor Confirmation system to use NEM Blockchain and secure your account assets from being stolen using the NEM Blockchain native features.»\n\nThe _Authenticator_ name is because it behaves similar to other similar apps like Google Authenticator, but it should be named _NEM Confirmator_ to be exact.\n\nI would like to analyse the differences between Google Authenticator (and similar apps) with NEM Authenticator. \n\n### What does Google Authenticator? \n\nLet's check what [Wikipedia](https://en.wikipedia.org/wiki/Google_Authenticator) says:\n\n> Google Authenticator is a software token that implements two-step verification services using the Time-based One-time Password Algorithm (TOTP) and HMAC-based One-time Password Algorithm (HOTP), for authenticating users of mobile applications by Google.\n> \n> Authenticator provides a six- to eight-digit one-time password which users must provide in addition to their username and password to log into Google services or other sites.\n\nSo, using Google Authenticator, we can enable a two-step verification to authenticate ourselves in third party software, usually web pages, and keep our accounts securer since it requires our login credentials (email and password) and a one-time password given by Google Authenticator.\n\nOnce you are logged into the web page, you can navigate and do whatever you want as a logged user. But, when we are in a Blockchain environment, you just need the private key to initialize transactions, how could you protect yourself validating the transaction you want to send twice using different devices?\n\n### What does NEM Authenticator?\n\nNEM Authenticator is a mobile application that fetches the unconfirmed transactions from a Multisig Account that needs its approval in order to included in a block.\n\nAuthenticator provides a list and detailed transaction details so the owner can check it it is the transaction he/she has initialized is legit. \n\nIn case the NanoWallet account is compromised, the stealer still needs the NEM Authenticator confirmation in order to steal the assets.\n\nObviously, **do not confirm a transaction that you have not initialized**. \n\n### Why combining Google Authenticator and NEM Authenticator is not possible?\n\nSince Google Authenticator allows you to login in some web page, it means that the private key is managed by a third party. It implies the control of the assets are delegated to someone else rather than the nem multisig account owner. \n\nThe goal of NEM Authenticator is keep the responsibility and the power to the owner as much as possible, in this case, the owner has the 100% of the responsibility and the power over its assets since NEM Authenticator does not use any third party software, just NEM Blockchain.\n\n**Be careful using NEM Authenticator in mobile devices that could be compromised with Malware**, since they could steal your wallet credentials and wallet file, giving the attacker the power of the confirmer account. The attacker still needs to control another account, but better to keep all devices clean of Malware.\n\n### Why is this possible?\n\nNEM Blockchain has the [Multisig Account feature](https://docs.nem.io/en/other-wallets/iphone-wallet/multisig), In summary, in order to send a transaction from one multisig account to another account, the multisig cosigners  had to agree.\n\nUsing this native feature from NEM Blockchain, we can create NEM Authenticator. NEM Authenticator can be seen as a easy to use mobile application to make the process to send assets easier and less tedious, keeping the security that NEM Blockchain offers. Why? **Because you keep the full control over the private keys**.\n\n![](https://steemitimages.com/DQmcE16UV3FArm5tZcABJYNM6cEysAqFLeXbhyMQcya1gJu/image.png)\n\nIf you want to know more about Multisig, [check this page](https://blog.nem.io/how-to-use-multi-signature-contracts-with-nanowallet/).\n\n- [NEM Authenticator general article](https://medium.com/@aleixmorgadas/nem-authenticator-2fc-ab607513c62d): For all users\n- [How to Setup NEM Authenticator Tutorial](https://medium.com/@aleixmorgadas/nem-authenticator-tutorial-c9755beda3a0): For all users\n- [How NEM Authenticator is made](https://medium.com/@aleixmorgadas/how-nem-authenticator-is-made-6b0b4b1da7c7): For developers\n- [Source Code at Github under MIT License](https://github.com/aleixmorgadas/NEM-Authenticator): For developers",
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      "title": "NEM Authenticator vs common \"Authenticator\" applications. Why NEM Auth keeps the power and reponsibility on users hands.",
      "body": "![logo-extended-1200x335-white-bg-roboto.png](https://steemitimages.com/DQmUZyHqJKc6KhNAvCuDv9fnJKFrs14Uh2o7XX3TD4mz77k/logo-extended-1200x335-white-bg-roboto.png)\n\n«NEM Authenticator is a 100% decentralized 2 Factor Confirmation system to use NEM Blockchain and secure your account assets from being stolen using the NEM Blockchain native features.»\n\nThe _Authenticator_ name is because it behaves similar to other similar apps like Google Authenticator, but it should be named _NEM Confirmator_ to be exact.\n\nI would like to analyse the differences between Google Authenticator (and similar apps) with NEM Authenticator. \n\n### What does Google Authenticator? \n\nLet's check what [Wikipedia](https://en.wikipedia.org/wiki/Google_Authenticator) says:\n\n> Google Authenticator is a software token that implements two-step verification services using the Time-based One-time Password Algorithm (TOTP) and HMAC-based One-time Password Algorithm (HOTP), for authenticating users of mobile applications by Google.\n> \n> Authenticator provides a six- to eight-digit one-time password which users must provide in addition to their username and password to log into Google services or other sites.\n\nSo, using Google Authenticator, we can enable a two-step verification to authenticate ourselves in third party software, usually web pages, and keep our accounts securer since it requires our login credentials (email and password) and a one-time password given by Google Authenticator.\n\nOnce you are logged into the web page, you can navigate and do whatever you want as a logged user. But, when we are in a Blockchain environment, you just need the private key to initialize transactions, how could you protect yourself validating the transaction you want to send twice using different devices?\n\n### What does NEM Authenticator?\n\nNEM Authenticator is a mobile application that fetches the unconfirmed transactions from a Multisig Account that needs its approval in order to included in a block.\n\nAuthenticator provides a list and detailed transaction details so the owner can check it it is the transaction he/she has initialized is legit. \n\nIn case the NanoWallet account is compromised, the stealer still needs the NEM Authenticator confirmation in order to steal the assets.\n\nObviously, **do not confirm a transaction that you have not initialized**. \n\n### Why combining Google Authenticator and NEM Authenticator is not possible?\n\nSince Google Authenticator allows you to login in some web page, it means that the private key is managed by a third party. It implies the control of the assets are delegated to someone else rather than the nem multisig account owner. \n\nThe goal of NEM Authenticator is keep the responsibility and the power to the owner as much as possible, in this case, the owner has the 100% of the responsibility and the power over its assets since NEM Authenticator does not use any third party software, just NEM Blockchain.\n\n**Be careful using NEM Authenticator in mobile devices that could be compromised with Malware**, since they could steal your wallet credentials and wallet file, giving the attacker the power of the confirmer account. The attacker still needs to control another account, but better to keep all devices clean of Malware.\n\n### Why is this possible?\n\nNEM Blockchain has the [Multisig Account feature](https://docs.nem.io/en/other-wallets/iphone-wallet/multisig), In summary, in order to send a transaction from one multisig account to another account, the multisig cosigners  had to agree.\n\nUsing this native feature from NEM Blockchain, we can create NEM Authenticator. NEM Authenticator can be seen as a easy to use mobile application to make the process to send assets easier and less tedious, keeping the security that NEM Blockchain offers. Why? **Because you keep the full control over the private keys**.\n\n![](https://steemitimages.com/DQmcE16UV3FArm5tZcABJYNM6cEysAqFLeXbhyMQcya1gJu/image.png)\n\nIf you want to know more about Multisig, [check this page](https://blog.nem.io/how-to-use-multi-signature-contracts-with-nanowallet/).\n\n- [NEM Authenticator general article](https://medium.com/@aleixmorgadas/nem-authenticator-2fc-ab607513c62d): For all users\n- [How to Setup NEM Authenticator Tutorial](https://medium.com/@aleixmorgadas/nem-authenticator-tutorial-c9755beda3a0): For all users\n- [How NEM Authenticator is made](https://medium.com/@aleixmorgadas/how-nem-authenticator-is-made-6b0b4b1da7c7): For developers\n- [Source Code at Github under MIT License](https://github.com/aleixmorgadas/NEM-Authenticator): For developers",
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      "author": "aleixmorgadas",
      "permlink": "why-nem-authenticator-is-important-to-give-security-and-keep-the-power-in-the-user-hands",
      "title": "Why NEM Authenticator is important to give security and keep the power in the user hands",
      "body": "![logo-extended-1200x335-white-bg-roboto.png](https://steemitimages.com/DQmUZyHqJKc6KhNAvCuDv9fnJKFrs14Uh2o7XX3TD4mz77k/logo-extended-1200x335-white-bg-roboto.png)\n\n«NEM Authenticator is a 100% decentralized 2 Factor Confirmation system to use NEM Blockchain and secure your account assets from being stolen using the NEM Blockchain native features.»\n\nThe _Authenticator_ name is because it behaves similar to other similar apps like Google Authenticator, but it should be named _NEM Confirmator_ to be exact.\n\nI would like to analyse the differences between Google Authenticator (and similar apps) with NEM Authenticator. \n\n### What does Google Authenticator? \n\nLet's check what [Wikipedia](https://en.wikipedia.org/wiki/Google_Authenticator) says:\n\n> Google Authenticator is a software token that implements two-step verification services using the Time-based One-time Password Algorithm (TOTP) and HMAC-based One-time Password Algorithm (HOTP), for authenticating users of mobile applications by Google.\n> \n> Authenticator provides a six- to eight-digit one-time password which users must provide in addition to their username and password to log into Google services or other sites.\n\nSo, using Google Authenticator, we can enable a two-step verification to authenticate ourselves in third party software, usually web pages, and keep our accounts securer since it requires our login credentials (email and password) and a one-time password given by Google Authenticator.\n\nOnce you are logged into the web page, you can navigate and do whatever you want as a logged user. But, when we are in a Blockchain environment, you just need the private key to initialize transactions, how could you protect yourself validating the transaction you want to send twice using different devices?\n\n### What does NEM Authenticator?\n\nNEM Authenticator is a mobile application that fetches the unconfirmed transactions from a Multisig Account that needs its approval in order to included in a block.\n\nAuthenticator provides a list and detailed transaction details so the owner can check it it is the transaction he/she has initialized is legit. \n\nIn case the NanoWallet account is compromised, the stealer still needs the NEM Authenticator confirmation in order to steal the assets.\n\nObviously, **do not confirm a transaction that you have not initialized**. \n\n### Why combining Google Authenticator and NEM Authenticator is not possible?\n\nSince Google Authenticator allows you to login in some web page, it means that the private key is managed by a third party. It implies the control of the assets are delegated to someone else rather than the nem multisig account owner. \n\nThe goal of NEM Authenticator is keep the responsibility and the power to the owner as much as possible, in this case, the owner has the 100% of the responsibility and the power over its assets since NEM Authenticator does not use any third party software, just NEM Blockchain.\n\n**Be careful using NEM Authenticator in mobile devices that could be compromised with Malware**, since they could steal your wallet credentials and wallet file, giving the attacker the power of the confirmer account. The attacker still needs to control another account, but better to keep all devices clean of Malware.\n\n### Why is this possible?\n\nNEM Blockchain has the [Multisig Account feature](https://docs.nem.io/en/other-wallets/iphone-wallet/multisig), In summary, in order to send a transaction from one multisig account to another account, the multisig cosigners  had to agree.\n\nUsing this native feature from NEM Blockchain, we can create NEM Authenticator. NEM Authenticator can be seen as a easy to use mobile application to make the process to send assets easier and less tedious, keeping the security that NEM Blockchain offers. Why? **Because you keep the full control over the private keys**.\n\n![](https://steemitimages.com/DQmcE16UV3FArm5tZcABJYNM6cEysAqFLeXbhyMQcya1gJu/image.png)\n\nIf you want to know more about Multisig, [check this page](https://blog.nem.io/how-to-use-multi-signature-contracts-with-nanowallet/).\n\n- [NEM Authenticator general article](https://medium.com/@aleixmorgadas/nem-authenticator-2fc-ab607513c62d): For all users\n- [How to Setup NEM Authenticator Tutorial](https://medium.com/@aleixmorgadas/nem-authenticator-tutorial-c9755beda3a0): For all users\n- [How NEM Authenticator is made](https://medium.com/@aleixmorgadas/how-nem-authenticator-is-made-6b0b4b1da7c7): For developers\n- [Source Code at Github under MIT License](https://github.com/aleixmorgadas/NEM-Authenticator): For developers",
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      "permlink": "re-marc0o-re-aleixmorgadas-nem-authenticator-a-2-factor-confirmation-mobile-application-20180108t094837781z",
      "title": "",
      "body": "Thank you Marco :-)",
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      "body": "resteemed! ... keep up the good work aleix!",
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      "title": "NEM Authenticator, a 2 Factor Confirmation mobile application",
      "body": "@@ -1163,25 +1163,8 @@\n ets \n-at the same time \n in o\n@@ -2004,16 +2004,97 @@\n or.app%0A%0A\n+Check %5Bthis video in vimeo%5D(https://vimeo.com/249962867) to know how it works !%0A%0A\n - Check \n",
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      "parent_permlink": "nem",
      "author": "aleixmorgadas",
      "permlink": "nem-authenticator-a-2-factor-confirmation-mobile-application",
      "title": "NEM Authenticator, a 2 Factor Confirmation mobile application",
      "body": "# Fast Introduction to NEM (and incomplete)\n\nAs you may already know, [NEM](https://nem.io) is a peer-to-peer cryptocurrency and blockchain platform. Check more info [here](https://nem.io).\n\nOne of the most characteristics things of NEM is its REST API, enabling an easy integration with. Also, one of the most important features is _Multisig Accounts_. Multisig Accounts adds a security to the user, allowing to lock the assets inside a Multisig Accounts, and just let the cosigners send transactions from that locked account. So, in case some account gets compromised, the attacker still needs to get access to the other cosignatories.  Check the details [here](https://docs.nem.io/en/nanowallet/multisignature-multiuser).\n\n# NEM Authenticator\n\n![logo-extended-1200x335-white-bg.png](https://steemitimages.com/DQmdzEuMfCztmccs4Qa9Pwt9B5nbU9ogsnGjVPWLAX2Qzyx/logo-extended-1200x335-white-bg.png)\n\nWe wanted to create an easy to use mobile application to add a security layer and keep NEM Wallets usable, without need to do a lot of steps in order to use Multisig Accounts.\n\nUsually, when a NEM user works with a multisig account, it needs to load different wallets at the same time in order to send a transaction from the multisig account. It may be less securer since you need to load different wallets in the same machine that could be compromised. So, usually you open different devices (maybe two computers) and perform the agreement to send that transaction in two devices. It isn't comfortable. NEM Authenticator solves it.\n\nNEM Authenticator is a free 100% decentralized mobile application that allows you start a transaction from your Main Wallet account in your computer device, and confirm the transaction in your mobile device. It adds a good security layer, since the attacker needs to compromise two devices in order to steal your founds.\n\nNEM Authenticator is currently just available in Google Play, but it will be published for iOS soon.\n\nhttps://play.google.com/store/apps/details?id=com.nemauthenticator.app\n\n- Check the main description article in medium: https://medium.com/@aleixmorgadas/nem-authenticator-2fc-ab607513c62d\n- Check the setup tutorial extended for non-experted users in medium: https://medium.com/@aleixmorgadas/nem-authenticator-tutorial-c9755beda3a0\n- If you are a developer and have curiosity of how is it done, check this article: https://medium.com/@aleixmorgadas/how-nem-authenticator-is-made-6b0b4b1da7c7\n- Here the tool used to create the application [nemlibrary.com](https://nemlibrary.com/) in combination with Ionic Framework v3",
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      "title": "",
      "body": "thx aleix, really appreciate your comment! :-)",
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      "author": "aleixmorgadas",
      "permlink": "kotlin-coroutines-sample",
      "title": "Kotlin Coroutines Sample",
      "body": "[Kotlin 1.1](https://blog.jetbrains.com/kotlin/2017/01/kotlin-1-1-beta-is-here/) comes with a new feature called [Coroutines](https://github.com/Kotlin/kotlin-coroutines).\n\nQuoting the official Kotlin blog:\n> Honestly, it’s hard to over-emphasize coroutines. The future has come, and we are stuck with it: we need non-blocking asynchronous APIs to keep up with the loads of data we are processing. We’ve been through callback hell and conquered it, but we deserve better. We want to simply write the code following its natural sequential logic, and let the compiler figure the asynchrony out for us. This is what coroutines are about: async/await, generate/yield, non-blocking IO, Rx and much more brought under the single unified paradigm of a suspending function. Such a function (or lambda) represents a computation that can be suspended (without blocking any threads) and resumed later.\n\nFor a better blocking, asynchronous and non-blocking APIs understanding I have created a github repository ( [github.com/aleixmorgadas/kotlin-coroutines-sample](https://github.com/aleixmorgadas/kotlin-coroutines-sample) ) with sample code.  The project aims to show you how each type of API call is executed.\n\nHave a nice coding day!",
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