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      "author": "runkod",
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      "title": "",
      "body": "For now, it works only with users who has blockstack id to be able to map/route to correct files. Maybe in future, there will be options 🙂",
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      "body": "Yes, we have some plans on this area too, once we have done detailed analysis of potential solutions. We will let community know 😉",
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      "author": "friedger",
      "permlink": "q0uunf",
      "title": "",
      "body": "> Is it working on a blockchain?\nRelatively. Blockstack keeps some records of Gaia storage on a blockchain.\n\n@runkod I would say that there is no record of gaia storage on a blockchain. Currently there is only the blockstack id / owner address association stored on chain. I don't even see a lookup of a blockstack id in the code. Would runkod work also for anonymous users (i.e. without a public blockstack id, just an address)?",
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      "body": "Currently, runkod does not use any domain service, does it? It just uses the storage that the hosting user provides.",
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      "author": "runkod",
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      "title": "",
      "body": "Thank you @friedger for feedback and support! Please do let us know if you have some feature requests. 🙇",
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      "author": "friedger",
      "permlink": "pzcxv5",
      "title": "",
      "body": "@@ -152,8 +152,83 @@\n and use.\n+%0A%0AI am looking forward to a more detailed description about how this works.\n",
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      "author": "friedger",
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      "title": "",
      "body": "@@ -10,16 +10,17 @@\n blished \n+%5B\n oitimesh\n@@ -37,16 +37,53 @@\n apps.com\n+%5D(https://oitimesheet.runkodapps.com)\n  for hos\n",
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      "body": "I have published oitimesheet.runkodapps.com for hosting of my development branch. It was quick and easy to setup and use.",
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      "body": "Congratulations @friedger! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@friedger/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/@friedger) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=friedger)_</sub>\n\n\n> You can upvote this notification to help all Steem users. Learn how [here](https://steemit.com/steemitboard/@steemitboard/http-i-cubeupload-com-7ciqeo-png)!",
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      "body": "Thanks for the info @friedger. The 24+ DIDs are provisional, which means they are not available yet.",
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      "parent_permlink": "re-bunnychum-unstoppable-domains-another-step-towards-decentralized-internet-or-booking-open-20190421t153437780z",
      "author": "friedger",
      "permlink": "re-devann-re-bunnychum-unstoppable-domains-another-step-towards-decentralized-internet-or-booking-open-20190421t220529212z",
      "title": "",
      "body": "There is much more to these decentralized names. There is a W3C community group working on decentralized identifiers (DIDs), the DID foundation, the reboot web of trust events,..\n\nYou can find 24+ different decentralized identity providers already. See the w3c registry: https://w3c-ccg.github.io/did-method-registry/#the-registry\n\nI would say blockstack.org is one of the leading players in the decentralized domain name system.",
      "json_metadata": "{\"tags\":[\"blockchain\"],\"links\":[\"https://w3c-ccg.github.io/did-method-registry/#the-registry\"],\"app\":\"steemit/0.1\"}"
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  "timestamp": "2018-11-29T05:31:06",
  "op": [
    "delegate_vesting_shares",
    {
      "delegator": "steem",
      "delegatee": "friedger",
      "vesting_shares": "2013.698284 VESTS"
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    {
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      "delegatee": "friedger",
      "vesting_shares": "13978.794212 VESTS"
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  "timestamp": "2018-10-07T04:32:18",
  "op": [
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    {
      "voter": "gaboesquivel",
      "author": "friedger",
      "permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "weight": 10000
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{
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  "timestamp": "2018-08-30T05:29:09",
  "op": [
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    {
      "parent_author": "friedger",
      "parent_permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "author": "friedger",
      "permlink": "re-friedger-auto-feed-monsters-or-the-value-of-nfts-20180830t052908986z",
      "title": "",
      "body": "If you setup buddy.works, make sure that you set the version of eos-dev image to 1.1.0 (not 1.2.+). Version 1.2.+ would be used if you leave `latestet` in the version field.\n\nThe version is set in the environment section of the action ![Bildschirmfoto vom 2018-08-30 07-28-24.png](https://cdn.steemitimages.com/DQmdcSRL2jRZjf9pUnnhdpzLrUM1hBNQaoTS8HPwUx6vpBF/Bildschirmfoto%20vom%202018-08-30%2007-28-24.png)",
      "json_metadata": "{\"tags\":[\"eos\"],\"image\":[\"https://cdn.steemitimages.com/DQmdcSRL2jRZjf9pUnnhdpzLrUM1hBNQaoTS8HPwUx6vpBF/Bildschirmfoto%20vom%202018-08-30%2007-28-24.png\"],\"app\":\"steemit/0.1\"}"
    }
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{
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  "block": 25184430,
  "trx_in_block": 2,
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  "virtual_op": 0,
  "timestamp": "2018-08-18T19:57:42",
  "op": [
    "vote",
    {
      "voter": "cryptolions",
      "author": "friedger",
      "permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "weight": 10000
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{
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  "trx_in_block": 5,
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  "timestamp": "2018-08-18T15:09:18",
  "op": [
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    {
      "parent_author": "friedger",
      "parent_permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "author": "leordev",
      "permlink": "re-friedger-auto-feed-monsters-or-the-value-of-nfts-20180818t150915871z",
      "title": "",
      "body": "I loved it, my challenge to you or the community is to create a bot that auto battle lol!",
      "json_metadata": "{\"community\":\"busy\",\"app\":\"busy/2.5.6\",\"format\":\"markdown\",\"tags\":[\"eos\"],\"users\":[],\"links\":[],\"image\":[]}"
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  "op": [
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      "author": "friedger",
      "permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "weight": 10000
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  "op": [
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{
  "trx_id": "d60aea2f548245c96fdb14d3474c113091fe2b0e",
  "block": 24755085,
  "trx_in_block": 8,
  "op_in_trx": 0,
  "virtual_op": 0,
  "timestamp": "2018-08-03T22:02:42",
  "op": [
    "comment",
    {
      "parent_author": "",
      "parent_permlink": "eos",
      "author": "friedger",
      "permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "title": "Auto-feed Monsters or The Value of NFTs",
      "body": "In the previous two posts about monsters ([Collect monsters](https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos) and [Exchange monsters](https://steemit.com/eos/@friedger/exchange-monsters-or-how-to-implement-transfers-of-nfts-between-contract)) I talked about how monsters can be non-fungible tokens(NFTs). This post is more directed to the users of the monsters game or NFTs in general.\n\n![monster-105-pixeled.png](https://cdn.steemitimages.com/DQmfS1VaQXrqFkRDLH3UJCUmTjcKGuuW1PpkDfomKRsqLjx/monster-105-pixeled.png)\n\n## Auto-feed\nThere are a few requests in the monstereos channel, how to feed monsters while on vacation or away from the internet. Ideas mentioned were monster caring services or handing over private keys. Both is not recommended - you never know who is on the other side. \n\nWhen [buddy.works](https://buddy.works), a continuous  integration service announced support for EOS it was clear that this could be the solution to the feeding problem. So, I created a new EOS account [noctambulist](https://eosweb.net/account/noctambulist) and transferred around 1 EOS, enough to run the monster actions. \n\nIn the online service https://apps.buddy.works do the following:\n1. Create a new project\n1. Add a new pipeline, choose a name, select `recurrent`, choose every 12h\n1. Add a new action from `Blockchain`, choose `Build EOS`\n1. In the `Run commands` text area past the following lines, replacing the pet_id `3673`with your monster id and the account `noctambulist` with your account name.\n\n````\ncleos wallet create\ncleos wallet import --private-key ${PRIVAT_KEY}\ncleos -u https://eu.eosdac.io push action monstereosio feedpet '{\"pet_id\": 3673}' -p noctambulist \n````\n\nFinally, go back to the pipeline page and add a new variable `PRIVAT_KEY` with the private key of the account (use the active key, not owner key). Make sure that encryption is enabled! Note that during the execution the private key is never shown. However, while pasting the private key into the text field I felt reassured that only 1 EOS is held in the account.\n\nNow, you just have to wait for 12h or hit `Run pipeline` button to see it work.\n\n## Warning\nMany things can go wrong! There is no guarantee that the monster is fed. The buddy.works service could break down, the transaction could be lost due to network problems, etc. As a user you are not notified. Furthermore, the warnings that are usually given about the monster already being fed, or not awake or so are not shown.\n\nHaving said that, the monster #3673, named `Sleepy1` is still alive and happy at the time of writing.\n\n![sleepy1.png](https://cdn.steemitimages.com/DQmYrWcJVGrtzVGmTqb8xUUFatppp5dNTUzQTpVAB7VuRCy/sleepy1.png)\n\n## Value of NFTs\nThis leads to the question how to determine the value of NFTs. In some games it is **scarcity**, in others it is **time based** or **money** invested, or all it. For collectables like NFTs, in most cases the value is not rationally justified. \n\nIn monstereos, there is only a time-based aspect of it as creation is free and no shops are available yet. With the introduction of auto-feeding it becomes even more unclear, how to determine the value of monsters.  If auto-feeding is against the rules is still to be discussed, and if so, how this can be detected as the chain does not distinguishes between actions from humans or bots.\n\n## Conclusion\nIt is easy to setup a feeding service, if you are prepared to enter your private key into a web site.",
      "json_metadata": "{\"tags\":[\"eos\",\"monstereos\",\"nft\"],\"image\":[\"https://cdn.steemitimages.com/DQmfS1VaQXrqFkRDLH3UJCUmTjcKGuuW1PpkDfomKRsqLjx/monster-105-pixeled.png\",\"https://cdn.steemitimages.com/DQmYrWcJVGrtzVGmTqb8xUUFatppp5dNTUzQTpVAB7VuRCy/sleepy1.png\"],\"links\":[\"https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos\",\"https://steemit.com/eos/@friedger/exchange-monsters-or-how-to-implement-transfers-of-nfts-between-contract\",\"https://buddy.works\",\"https://eosweb.net/account/noctambulist\",\"https://apps.buddy.works\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
    }
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}

{
  "trx_id": "721479a00e8672834c8f90721474bf8080a902c2",
  "block": 24754934,
  "trx_in_block": 19,
  "op_in_trx": 0,
  "virtual_op": 0,
  "timestamp": "2018-08-03T21:55:09",
  "op": [
    "comment",
    {
      "parent_author": "",
      "parent_permlink": "eos",
      "author": "friedger",
      "permlink": "auto-feed-monsters-or-the-value-of-nfts",
      "title": "Auto-feed Monsters or The value of NFTs",
      "body": "In the previous two posts about monsters ([Collect monsters](https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos) and [Exchange monsters](https://steemit.com/eos/@friedger/exchange-monsters-or-how-to-implement-transfers-of-nfts-between-contract)) I talked about how monsters can be non-fungible tokens(NFTs). This post is more directed to the users of the monsters game or NFTs in general.\n\n![monster-105-pixeled.png](https://cdn.steemitimages.com/DQmfS1VaQXrqFkRDLH3UJCUmTjcKGuuW1PpkDfomKRsqLjx/monster-105-pixeled.png)\n\n## Auto-feed\nThere are a few requests in the monstereos channel, how to feed monsters while on vacation or away from the internet. Ideas mentioned were monster caring services or handing over private keys. Both is not recommended - you never know who is on the other side. \n\nWhen [buddy.works](https://buddy.works), a continuous  integration service announced support for EOS it was clear that this could be the solution to the feeding problem. So, I created a new EOS account [noctambulist](https://eosweb.net/account/noctambulist) and transferred around 1 EOS, enough to run the monster actions. \n\nIn the online service https://apps.buddy.works do the following:\n1. Create a new project\n1. Add a new pipeline, choose a name, select `recurrent`, choose every 12h\n1. Add a new action from `Blockchain`, choose `Build EOS`\n1. In the `Run commands` text area past the following lines, replacing the pet_id `3673`with your monster id and the account `noctambulist` with your account name.\n\n````\ncleos wallet create\ncleos wallet import --private-key ${PRIVAT_KEY}\ncleos -u https://eu.eosdac.io push action monstereosio feedpet '{\"pet_id\": 3673}' -p noctambulist \n````\n\nFinally, go back to the pipeline page and add a new variable `PRIVAT_KEY` with the private key of the account (use the active key, not owner key). Make sure that encryption is enabled! Note that during the execution the private key is never shown. However, while pasting the private key into the text field I felt reassured that only 1 EOS is held in the account.\n\nNow, you just have to wait for 12h or hit `Run pipeline` button to see it work.\n\n## Warning\nMany things can go wrong! There is no guarantee that the monster is fed. The buddy.works service could break down, the transaction could be lost due to network problems, etc. As a user you are not notified. Furthermore, the warnings that are usually given about the monster already being fed, or not awake or so are not shown.\n\nHaving said that, the monster #3673, named `Sleepy1` is still alive and happy at the time of writing.\n\n![sleepy1.png](https://cdn.steemitimages.com/DQmYrWcJVGrtzVGmTqb8xUUFatppp5dNTUzQTpVAB7VuRCy/sleepy1.png)\n\n## Value of NFTs\nThis leads to the question how to determine the value of NFTs. In some games it is **scarcity**, in others it is **time based** or **money** invested, or all it. For collectables like NFTs, in most cases the value is not rationally justified. \n\nIn monstereos, there is only a time-based aspect of it as creation is free and no shops are available yet. With the introduction of auto-feeding it becomes even more unclear, how to determine the value of monsters.  If auto-feeding is against the rules is still to be discussed, and if so, how this can be detected as the chain does not distinguishes between actions from humans or bots.\n\n## Conclusion\nIt is easy to setup a feeding service, if you are prepared to enter your private key into a web site.",
      "json_metadata": "{\"tags\":[\"eos\",\"monstereos\",\"nft\"],\"image\":[\"https://cdn.steemitimages.com/DQmfS1VaQXrqFkRDLH3UJCUmTjcKGuuW1PpkDfomKRsqLjx/monster-105-pixeled.png\",\"https://cdn.steemitimages.com/DQmYrWcJVGrtzVGmTqb8xUUFatppp5dNTUzQTpVAB7VuRCy/sleepy1.png\"],\"links\":[\"https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos\",\"https://steemit.com/eos/@friedger/exchange-monsters-or-how-to-implement-transfers-of-nfts-between-contract\",\"https://buddy.works\",\"https://eosweb.net/account/noctambulist\",\"https://apps.buddy.works\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
    }
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{
  "trx_id": "2aef929fc7cb6a7a81982361b21ae5b8b98c0eb3",
  "block": 24723891,
  "trx_in_block": 6,
  "op_in_trx": 0,
  "virtual_op": 0,
  "timestamp": "2018-08-02T20:02:30",
  "op": [
    "comment",
    {
      "parent_author": "",
      "parent_permlink": "eos",
      "author": "friedger",
      "permlink": "exchange-monsters-or-how-to-implement-transfers-of-nfts-between-contract",
      "title": "Exchange monsters or How to implement transfers of NFTs between contracts",
      "body": "## Market for Monsters\nIn the last [monstereos post](https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos), I wrote about making monsters of the tamagochi game [monstereos.io](http://monstereos.io) non-fungible tokens (NFTs) that can be exchanged between users with a simple method call. Now, let's bring in some value. The NFT should only be transferred if a certain amount of tokens were transferred to the owner and thereby create a market for monsters.\n\n![imageedit_23_3254665918.gif](https://cdn.steemitimages.com/DQmdtiVBRZsCY8c4BLmcGfDD4qMAGbFVPaN5QBfLk3N9jj1/imageedit_23_3254665918.gif)\n\nTo setup the monster market a new contract was created (monstereosmt). It contains the actions for asking and bidding for monsters. Without going into the aspects of finding matching offers and bids let's assume that an offer (created by the monster owner with the [offerpet action](https://github.com/friedger/monstereos/blob/market_value/contracts/market/market.offerpet_rc.md)) was accepted by a bidder and the owner updated the offer to include the name of the new owner, i.e. the bidder.\n\n## Simple Transfer\nFor the simple transfer discussed in the previous post (without value), the market contract needs to ask the game contract to update the ownership of the monster. This is because tables are world-readable, but only writable by the owning contract. So, an action needs to be added to the game contract that the market contract can call. For monstereos, the `claimpet` action of the market can be called by the new owner. That action should then call the `transferpet` action in the game contract. This is the code:\n\n    action(permission_level{_self, N(active)}, N(monstereosio), N(transferpet), std::make_tuple(pet.id, newowner)).send();\n\nThe action is send in the name of the contract, hence the permission level with self. The action to perform is `transferpet` of contract `monstereosio`. Finally, the parameters are added. Sending an action from a contract needs the `eosio.code` permission for the market account. This is done once with cleos like this:\n\n    cleos set account permission monstereosmt active \\\n    '{\"threshold\": 1,\n      \"keys\": [{\n        \"key\": \"'${EOS_KEY}'\",\n        \"weight\": 1\n      }],\n      \"accounts\": [{\n        \"permission\": {\"actor\": \"monstereosmt\",\n                       \"permission\": \"eosio.code\"},\n                       \"weight\": 1\n      }]}' owner -p monstereosmt\n\nOn the other side, in the game contract the `transferpet` method was added. However, it is important that the method is not added to the ABI, otherwise every contract could call this method. And then in the method, the authorization of the market contract needs to be verified:\n\n        require_auth(N(monstereosmt));\n\n## Transfer with Value\nMonsters that have been well fed and have played many battles are valuable and the new owner might be prepared to send some tokens in exchange for the monster. In order, to add value to a transfer the following steps are needed:\n\n1. **Transfer to escrow**: The bidder uses the token contract to transfer the agreed amount to the game escrow account (monstereosio in this case)\n2. **Verify offer and transfer**: The game contract validates the transferred amount, token symbol, and the identities of the owner and bidder with the offer.\n3. **Change ownership**: The game contract changes ownership.\n4. **Transfer funds from escrow**: The game contract transfers the tokens to the previous owner of the owner.\n5. **Tidy up**: The offer is deleted by the market contract which finalizes the transfer\n\nFor 1., it is just a call to the transfer action of the `eosio.token` contract, sending from the new owner to the game account. However, now it becomes interesting. What is needed to react on the transfer?\n\nAs described in EOS stackexchange, the market contract needs to adjust the `apply` method in the `EOSIO_ABI` macro. Currently, it is only possible to define your own `EOSIO_ABI_EX` accepting actions from the token contract by adding an other if-condition: \n\n    code == N(eosio.token)\n\nThis means all actions of the token contract that are implemented in the market contract are called in the market contract as well. In this case, it is only the `transfer` method.\n\n[*Protip*: Use a base file like `pet.cpp` and two main files like `petcode.cpp` and `petabi.cpp` to compile the wasm code using the `EOSIO_ABI_EX` and to generate the abi file using `EOS_ABI` (see [github for details](https://github.com/friedger/monstereos/tree/market_value/contracts/pet))]\n\nIn monstereosio, the transfer method was also used to update the account balance of the user, keeping up to date the amount the user transferred to the game. Now, the transfer method is extended with the handling of transferring ownership, bundled in method `_handletransf`.\n\nIn this method the memo of the transfer is inspected and the contained offer id extracted. With the offer id the details are retrieved from the table of the market contract using the type `_tb_offers` defined in the headers file (and abi) of the market contract.\n\n    _tb_offers offers(N(monstereosmt), N(monstereosmt))\n\nThe second parameter is `N(monstereosmt)` as there is only one global table. Some contracts us one table for each user. The call should then be like this:\n\n    _tb_offers offers(N(monstereosmt), N(pet.owner))\n\nAfter the offer was retrieved from the table, the amount, symbol, owner and offer type is validated. Once, the transfer can go ahead the token is transferred to the old owner of the monster, the ownership of the monster table is updated. For transferring the asset the game contract needs to have the permission to send actions. As described above, this is done with a single cleos call but this time for account `monstereosio`:\n\n    cleos set account permission monstereosio active \\\n    '{\"threshold\": 1,\n      \"keys\": [{\n        \"key\": \"'${EOS_KEY}'\",\n        \"weight\": 1\n      }],\n      \"accounts\": [{\n        \"permission\": {\"actor\": \"monstereosio\",\n                       \"permission\": \"eosio.code\"},\n                       \"weight\": 1\n      }]}' owner -p monstereosio\n\nFinally, the balance of the new owner account is decreased as it was increased at the beginning of the transfer of ownership. However, this is not necessarily needed for other use cases of NFTs.\n\n## Conclusion\nSending an action from one contract to another can be done with `action(...).send()` if the contract account has permission `eosio.code`. This works even if the action is not included in the ABI. The action is executed with the authority of the sending account.",
      "json_metadata": "{\"tags\":[\"eos\",\"monstereos\",\"nft\"],\"image\":[\"https://cdn.steemitimages.com/DQmdtiVBRZsCY8c4BLmcGfDD4qMAGbFVPaN5QBfLk3N9jj1/imageedit_23_3254665918.gif\"],\"links\":[\"https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos\",\"http://monstereos.io\",\"https://github.com/friedger/monstereos/blob/market_value/contracts/market/market.offerpet_rc.md\",\"https://github.com/friedger/monstereos/tree/market_value/contracts/pet\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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  "timestamp": "2018-08-02T07:59:42",
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      "parent_permlink": "eos",
      "author": "friedger",
      "permlink": "exchange-monsters-or-how-to-implement-transfers-of-nfts-between-contract",
      "title": "Exchange monsters or How to implement transfers of NFTs between contract",
      "body": "## Market for Monsters\nIn the last [monstereos post](https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos), I wrote about making monsters of the tamagochi game [monstereos.io](http://monstereos.io) non-fungible tokens (NFTs) that can be exchanged between users with a simple method call. Now, let's bring in some value. The NFT should only be transferred if a certain amount of tokens were transferred to the owner and thereby create a market for monsters.\n\n![imageedit_23_3254665918.gif](https://cdn.steemitimages.com/DQmdtiVBRZsCY8c4BLmcGfDD4qMAGbFVPaN5QBfLk3N9jj1/imageedit_23_3254665918.gif)\n\nTo setup the monster market a new contract was created (monstereosmt). It contains the actions for asking and bidding for monsters. Without going into the aspects of finding matching offers and bids let's assume that an offer (created by the monster owner with the [offerpet action](https://github.com/friedger/monstereos/blob/market_value/contracts/market/market.offerpet_rc.md)) was accepted by a bidder and the owner updated the offer to include the name of the new owner, i.e. the bidder.\n\n## Simple Transfer\nFor the simple transfer discussed in the previous post (without value), the market contract needs to ask the game contract to update the ownership of the monster. This is because tables are world-readable, but only writable by the owning contract. So, an action needs to be added to the game contract that the market contract can call. For monstereos, the `claimpet` action of the market can be called by the new owner. That action should then call the `transferpet` action in the game contract. This is the code:\n\n    action(permission_level{_self, N(active)}, N(monstereosio), N(transferpet), std::make_tuple(pet.id, newowner)).send();\n\nThe action is send in the name of the contract, hence the permission level with self. The action to perform is `transferpet` of contract `monstereosio`. Finally, the parameters are added. Sending an action from a contract needs the `eosio.code` permission for the market account. This is done once with cleos like this:\n\n    cleos set account permission monstereosmt active \\\n    '{\"threshold\": 1,\n      \"keys\": [{\n        \"key\": \"'${EOS_KEY}'\",\n        \"weight\": 1\n      }],\n      \"accounts\": [{\n        \"permission\": {\"actor\": \"monstereosmt\",\n                       \"permission\": \"eosio.code\"},\n                       \"weight\": 1\n      }]}' owner -p monstereosmt\n\nOn the other side, in the game contract the `transferpet` method was added. However, it is important that the method is not added to the ABI, otherwise every contract could call this method. And then in the method, the authorization of the market contract needs to be verified:\n\n        require_auth(N(monstereosmt));\n\n## Transfer with Value\nMonsters that have been well fed and have played many battles are valuable and the new owner might be prepared to send some tokens in exchange for the monster. In order, to add value to a transfer the following steps are needed:\n\n1. **Transfer to escrow**: The bidder uses the token contract to transfer the agreed amount to the game escrow account (monstereosio in this case)\n2. **Verify offer and transfer**: The game contract validates the transferred amount, token symbol, and the identities of the owner and bidder with the offer.\n3. **Change ownership**: The game contract changes ownership.\n4. **Transfer funds from escrow**: The game contract transfers the tokens to the previous owner of the owner.\n5. **Tidy up**: The offer is deleted by the market contract which finalizes the transfer\n\nFor 1., it is just a call to the transfer action of the `eosio.token` contract, sending from the new owner to the game account. However, now it becomes interesting. What is needed to react on the transfer?\n\nAs described in EOS stackexchange, the market contract needs to adjust the `apply` method in the `EOSIO_ABI` macro. Currently, it is only possible to define your own `EOSIO_ABI_EX` accepting actions from the token contract by adding an other if-condition: \n\n    code == N(eosio.token)\n\nThis means all actions of the token contract that are implemented in the market contract are called in the market contract as well. In this case, it is only the `transfer` method.\n\n[*Protip*: Use a base file like `pet.cpp` and two main files like `petcode.cpp` and `petabi.cpp` to compile the wasm code using the `EOSIO_ABI_EX` and to generate the abi file using `EOS_ABI` (see [github for details](https://github.com/friedger/monstereos/tree/market_value/contracts/pet))]\n\nIn monstereosio, the transfer method was also used to update the account balance of the user, keeping up to date the amount the user transferred to the game. Now, the transfer method is extended with the handling of transferring ownership, bundled in method `_handletransf`.\n\nIn this method the memo of the transfer is inspected and the contained offer id extracted. With the offer id the details are retrieved from the table of the market contract using the type `_tb_offers` defined in the headers file (and abi) of the market contract.\n\n    _tb_offers offers(N(monstereosmt), N(monstereosmt))\n\nThe second parameter is `N(monstereosmt)` as there is only one global table. Some contracts us one table for each user. The call should then be like this:\n\n    _tb_offers offers(N(monstereosmt), N(pet.owner))\n\nAfter the offer was retrieved from the table, the amount, symbol, owner and offer type is validated. Once, the transfer can go ahead the token is transferred to the old owner of the monster, the ownership of the monster table is updated. For transferring the asset the game contract needs to have the permission to send actions. As described above, this is done with a single cleos call but this time for account `monstereosio`:\n\n    cleos set account permission monstereosio active \\\n    '{\"threshold\": 1,\n      \"keys\": [{\n        \"key\": \"'${EOS_KEY}'\",\n        \"weight\": 1\n      }],\n      \"accounts\": [{\n        \"permission\": {\"actor\": \"monstereosio\",\n                       \"permission\": \"eosio.code\"},\n                       \"weight\": 1\n      }]}' owner -p monstereosio\n\nFinally, the balance of the new owner account is decreased as it was increased at the beginning of the transfer of ownership. However, this is not necessarily needed for other use cases of NFTs.\n\n## Conclusion\nSending an action from one contract to another can be done with `action(...).send()` if the contract account has permission `eosio.code`. This works even if the action is not included in the ABI. The action is executed with the authority of the sending account.",
      "json_metadata": "{\"tags\":[\"eos\",\"monstereos\",\"nft\"],\"image\":[\"https://cdn.steemitimages.com/DQmdtiVBRZsCY8c4BLmcGfDD4qMAGbFVPaN5QBfLk3N9jj1/imageedit_23_3254665918.gif\"],\"links\":[\"https://steemit.com/eos/@friedger/collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos\",\"http://monstereos.io\",\"https://github.com/friedger/monstereos/blob/market_value/contracts/market/market.offerpet_rc.md\",\"https://github.com/friedger/monstereos/tree/market_value/contracts/pet\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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      "author": "friedger",
      "permlink": "collect-monsters-or-how-to-implement-non-fungible-tokens-on-eos",
      "title": "Collect Monsters or How to implement non-fungible tokens on EOS",
      "body": "# The Game\n[Monstereos](http://monstereos.io) is named the first game implemented on the EOS blockchain. It is a [Tamagotchi](https://en.wikipedia.org/wiki/Tamagotchi) alike game where the user has to care for their monsters. There are no creation fees for new monsters. The user has just to pay for the storage (< 400 bytes). Have a go, and try it out! Note that your monsters need to rest for 4 hours after birth and they can live for 20 hours without feeding. (This is also explained in the ricardian contract of the create action.)\n\n![monster-105.png](https://cdn.steemitimages.com/DQmNMKRLb3QVgiJ5FdAXWkrQAsZ75or29yZLQu9R81Vty9V/monster-105.png)\n\nWith your monsters, you can now also play in a battle  arena. You meet with another user,  everyone chooses one of the monsters to play and then you start attacking each other. Depending on the properties of the monster you have a different choice of attack methods. If you know the properties of the other monsters you have higher chances to win the game. There are 109 different types of monsters and each monster becomes unique by its name and its id. The monster can there be identified globally as `monstereosio:pets:2558` (first the contract account, then the place of storage/table name, then the id).\n\n# Non-fungible tokens\n\nWith the global identifier,  monsters become [non-fungible tokens](https://en.wikipedia.org/wiki/Non-fungible_token). On the Ethereum blockchain, the properties of NFTs are defined in [EIP-721](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md) and the standard requires the following methods:\n* balanceOf(owner)\n* ownerOf(tokenId)\n* \\*transferFrom(from, to, tokenId)\n* .. and more methods about approved addresses\n\n## ownerOf\nNon-fungible tokens (NFTs) have only one owner and you can find the owner by using e.g. \n \n    cleos get table monstereosio monstereosio  pets -L 2558 -l 1\n\nThis means one row (`-l 1`) starting from primary key with id 2558 (`-L 2558`) is queried.\n\nHence, the owner can be found by querying the table and looking for property `owner` in the result of `get table`. \n\n## tokenOfOwner\nOn the other hand, the NFTs of a owner can be found with\n\n    cleos get table monstereosio monstereosio  pets -L owner  -U ownerX --key-type i64 --index  2\n\nThis call assumes that the second index of the table `pets` is the index by owner. For the upper limit (`-U)` a name should be used  that follows `owner` and preceeds the next user. As names are limited to 12 characters appending one letter to `owner` like `ownerX` is a good choice to just receive the NFTs of the owner.\n\n\n## transfer\nWhen transferring a monster between users **without** payment it does not need more than an update of the table row in the `transfernft(owner, newowner, tokenId)` action. \n\n    pets.modify(itr_pet, 0, [&](auto &r) {\n        r.owner = newowner;\n    });\nThe code is taken from [github.com/leordev/monstereos](https://github.com/leordev/monstereos/blob/master/contracts/pet/pet.cpp)\n\nThe ricardian contract for that action could contain a part like the following:\n\n    ### Intent\n    The intent of the `{{ transfernft }}` action is to transfer ownership of the given digital asset to {{ newowner }}. Consequently move the cost for RAM of storing to the asset  to {{ newowner }}. {{actor}} confirms that {{newowner}} has agreed to pay for these costs and adhere to the contracts associated with the digital asset.\n        \n    ### Term\n    This Contract expires after the code was executed.\n\nThe text was adapted from [github.com/friedger/monstereos](https://github.com/friedger/monstereos/blob/market_value/contracts/market/market.offerpet_rc.md)\n\n# Conclusion\nNon-fungible tokens can be implemented using multi_index tables with the following conventions:\n* Tokens are identified by `contract:table_name:id`\n* The token table has a column `owner`\n* The second index of the token table is by column `owner`\n* The contract has a method `transfernft`\n\nFor Monstereos, the ricardian contract of the `createpet` action defines the rights and obligations of a monster owner. If and how this is applicable to the general concept of NFTs needs to be discussed. \n\nFuthermore, NFTs should be transferable with a value associated to the token. This becomes more tricky on the EOS blockchain. The contract has to listen for a certain `eosio.token::transfer` action and then react on that. I will explain the solution for monstereos in the next article.",
      "json_metadata": "{\"tags\":[\"eos\",\"monstereos\",\"nft\"],\"image\":[\"https://cdn.steemitimages.com/DQmNMKRLb3QVgiJ5FdAXWkrQAsZ75or29yZLQu9R81Vty9V/monster-105.png\"],\"links\":[\"http://monstereos.io\",\"https://en.wikipedia.org/wiki/Tamagotchi\",\"https://en.wikipedia.org/wiki/Non-fungible_token\",\"https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md\",\"https://github.com/leordev/monstereos/blob/master/contracts/pet/pet.cpp\",\"https://github.com/friedger/monstereos/blob/market_value/contracts/market/market.offerpet_rc.md\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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      "body": "Congratulations @friedger! You have received a personal award!\n\n[![](https://steemitimages.com/70x70/http://steemitboard.com/@friedger/birthday1.png)](http://steemitboard.com/@friedger)  1 Year on Steemit\n<sub>_Click on the badge to view your Board of Honor._</sub>\n\n\n> You can upvote this notification to help all Steemit users. Learn why [here](https://steemit.com/steemitboard/@steemitboard/http-i-cubeupload-com-7ciqeo-png)!",
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      "body": "✅  @friedger, I gave you an upvote on your post!<br><br>If you are interested in claiming free Byteballs ($10+), just for having a Steem account, please visit this post for instructions: https://steemit.com/steem/@berniesanders/do-you-want-some-free-byteballs",
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      "title": "Google behaves seriously illegally since 2011 in the Android ecosystem",
      "body": "Today, the EU competition commissioner Margrethe Vestager announced that Google behaves seriously illegally since 2011 with regards to the Android ecosystem. The fine of 5b$ is in the usual range maybe at the upper end.\n\n![pawel-czerwinski-710838-unsplash.jpg](https://cdn.steemitimages.com/DQmVmw3wyrkaEGiyGNGqFyM1drFfpLS976dKEPqc69nr9eU/pawel-czerwinski-710838-unsplash.jpg)\n\nThe commission found that Google is in a dominating market position in the mobile operating system market and the mobile internet search market. With that it has special responsibility towards the market as defined by the anti-competitive laws. However, Google did not lived up to that responsibility and hence behaves seriously illegally. \n\nIn particular, the commission found proofs that Google did require bundling their apps with Google Play Store. Google did pay device manufacturer a share of their ads revenue only if they did not preinstall any other search app next to Google Search app. Google did prevent device manufacturer to build devices with other operating systems. This behavior is not acceptable for a market dominating company.\n\nThe amount was determined by the usual rules of the commission taking into account the duration of the illegal behavior, the seriousness of the illegal behavior and the turnover of the company doing the illegal behavior. The fact that the amount is 5b$ shows that Google is one of the biggest companies behaving illegally ever.\n\nNow it is up to Google to change the situation effectively. We have to see what Google is doing, maybe they will send a push message to all user in the EU telling them that they can install a different browser or search app as requested by the Russian competition body, maybe Google Play will provide a page with all available browsers in Google Play.\n\nObviously, this will only happen after there the appeals process has finished.\n\nStill, I hope to see a Firefox phone with Google Play soon!",
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      "body": "Looks like an interesting project, but from what I understand it doesn't tie EOS accounts to profiles, so it's not quite covering the same ground. We'll hopefully move storage to IPFS before long, but for now all data can be freely downloaded by the community, and resurrected in the event of a significant server failure.",
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      "body": "Blockstack.org has defined a nice decentralized profile system. It defines a zone file to look up the profile data.  It is defined in their white paper and on some articles. Look for Blockchain Naming System (BNS)\n\nThe user can choose where the data is stored, i.e. it is decentralized, better protected against single point of failure.  What happens if the eostitan servers fail? The zone file is small and is store on chain.",
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      "body": "As usual in February, the open source community from Europe and all over the world unites at FOSDEM in Brussels, Belgium to discuss the latest developments in the open source world. The conference with around 8000 participants is a source of great inspiration and spirit. Topics range from linux, real-time communication, and hardware to decentralized services and human right protection.  \n\nMy highlight was to attend the unveiling of the first linux capable computer that has an open instruction set, i.e. runs on **RISC-V** architecture. I was following the development of RISC-V for a while and it felt good to see such a progress.\n\n![sifive.jpg](https://steemitimages.com/DQmRcbmAxXV1a3dene78jhqopeJBa2HiM1BTxSrDZMpdvDm/sifive.jpg)\n\nFurther on, I had the chance to talk to Matthew from **matrix.org** about the (hopefully) bright future. I also saw the probably first 3d video conferencing call using matrix and the depth camera of a smartphone. I learnt about how Android helped to improve the graphics stack in linux. In general, the event is great to learn about new open projects. \n\nI found out about **gitmate.io** that helps to organize issues using machine learning and about **bugmark.net** that takes a refreshing approach to bug bounties. bugmark.net is a market for future on the date when a bug is fixed. An investor bets that the bug is not fixed by a certain date and the developer bets that it will be fixed by then. It is based on smart contracts and it really brings market forces to the peer productivity of the open source world. And there is more to it like like triage, analytics, as I learn from Don Marti, the founder of the project, in the hallway after the blockchain Bird-Of-Feather (BOF) session. With the hype of blockchain and the support of Mozilla, the project can really become a game changer of the bounty schemes.\n\nAt a certain point I got confused about blockchain. In the Decentralised Internet devroom, the speaker talked about how bad it is that the EU commission wants blockchain everywhere, while I thought that this is quite good. But apparently, there are more opinions about blockchain applications from governments outside of my bubble. This is why FOSDEM is such a great event.\n\n![ebee6d87afce239a.jpg](https://steemitimages.com/DQmZuAKMxZqiYBVNmXDTefxdqe83PPvfjRTGJqY8pWp5w4E/ebee6d87afce239a.jpg)\n\nGoogle was also present. For one, as sponsor, then on posters from activists of laquadrature.net, but more importantly in the heads of all of us. In the above mentioned blockchain BOF session, a Google sheet was used to collaborate without thinking. No decentralized sheet, no open source app! Something that really bothers me.\n\nAs a volunteer, it was great to get in touch with random people and I can only encourage everybody interested in open source to do the same. Give something back! Yes, there were full rooms and long queues. But that is expected with so many sessions and attendees. The great organization team makes this possible for free, and by the way, the videos of many sessions already available online. See you next year!",
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