diff --git a/apps/contributor/contracts/Contributor.sol b/apps/contributor/contracts/Contributor.sol
index 16f0f66..8a092fe 100644
--- a/apps/contributor/contracts/Contributor.sol
+++ b/apps/contributor/contracts/Contributor.sol
@@ -16,7 +16,6 @@ contract Contributor is AragonApp {
     bytes32 ipfsHash;
     uint8 hashFunction;
     uint8 hashSize;
-    bool isCore;
     bool exists;
   }
 
@@ -33,14 +32,6 @@ contract Contributor is AragonApp {
   event ContributorAdded(uint32 id, address account);
 
   function initialize(address root,bytes32[4] _appIds) public onlyInit {
-    uint32 _id = contributorsCount + 1;
-    Contributor storage c = contributors[_id];
-    c.exists = true;
-    c.isCore = true;
-    c.account = root;
-    contributorIds[root] = _id;
-    contributorsCount += 1;
-
     appIds = _appIds;
 
     initialized();
@@ -55,7 +46,7 @@ contract Contributor is AragonApp {
   function coreContributorsCount() view public returns (uint32) {
     uint32 count = 0;
     for (uint32 i = 1; i <= contributorsCount; i++) {
-      if (contributors[i].isCore) {
+      if (isCoreTeam(i)) {
         count += 1;
       }
     }
@@ -79,13 +70,12 @@ contract Contributor is AragonApp {
     ContributorProfileUpdated(id, oldIpfsHash, c.ipfsHash);
   }
 
-  function addContributor(address account, bytes32 ipfsHash, uint8 hashFunction, uint8 hashSize, bool isCore) public isInitialized auth(MANAGE_CONTRIBUTORS_ROLE) {
+  function addContributor(address account, bytes32 ipfsHash, uint8 hashFunction, uint8 hashSize) public isInitialized auth(MANAGE_CONTRIBUTORS_ROLE) {
     require(!addressExists(account));
     uint32 _id = contributorsCount + 1;
     assert(!contributors[_id].exists); // this can not be acually
     Contributor storage c = contributors[_id];
     c.exists = true;
-    c.isCore = isCore;
     c.ipfsHash = ipfsHash;
     c.hashFunction = hashFunction;
     c.hashSize = hashSize;
@@ -96,8 +86,10 @@ contract Contributor is AragonApp {
     emit ContributorAdded(_id, account);
   }
 
-  function isCore(uint32 id) view public returns (bool) {
-    return contributors[id].isCore;
+  function isCoreTeam(uint32 id) view public returns (bool) {
+    // TODO: for simplicity we simply define the first contributors as core
+    // later this needs to be changed to something more dynamic
+    return id < 7;
   }
 
   function exists(uint32 id) view public returns (bool) {
@@ -105,7 +97,8 @@ contract Contributor is AragonApp {
   }
 
   function addressIsCore(address account) view public returns (bool) {
-    return getContributorByAddress(account).isCore;
+    uint32 id = getContributorIdByAddress(account);
+    return isCoreTeam(id);
   }
 
   function addressExists(address account) view public returns (bool) {
@@ -132,7 +125,7 @@ contract Contributor is AragonApp {
     ipfsHash = c.ipfsHash;
     hashFunction = c.hashFunction;
     hashSize = c.hashSize;
-    isCore = c.isCore;
+    isCore = isCoreTeam(id);
     address token = getTokenContract();
     balance = ITokenBalance(token).balanceOf(c.account);
     exists = c.exists;
diff --git a/lib/abis/Contributor.json b/lib/abis/Contributor.json
index 82542e8..3ef9f38 100644
--- a/lib/abis/Contributor.json
+++ b/lib/abis/Contributor.json
@@ -1 +1 @@
-[{"constant":true,"inputs":[],"name":"hasInitialized","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_script","type":"bytes"}],"name":"getEVMScriptExecutor","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getRecoveryVault","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"contributorsCount","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"token","type":"address"}],"name":"allowRecoverability","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"appId","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getInitializationBlock","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"contributorIds","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"KERNEL_APP_ADDR_NAMESPACE","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_token","type":"address"}],"name":"transferToVault","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"MANAGE_CONTRIBUTORS_ROLE","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint32"}],"name":"contributors","outputs":[{"name":"account","type":"address"},{"name":"ipfsHash","type":"bytes32"},{"name":"hashFunction","type":"uint8"},{"name":"hashSize","type":"uint8"},{"name":"isCore","type":"bool"},{"name":"exists","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getEVMScriptRegistry","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"kernel","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isPetrified","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"appIds","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"id","type":"uint32"},{"indexed":false,"name":"oldIpfsHash","type":"bytes32"},{"indexed":false,"name":"newIpfsHash","type":"bytes32"}],"name":"ContributorProfileUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"id","type":"uint32"},{"indexed":false,"name":"oldAccount","type":"address"},{"indexed":false,"name":"newAccount","type":"address"}],"name":"ContributorAccountUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"id","type":"uint32"},{"indexed":false,"name":"account","type":"address"}],"name":"ContributorAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"executor","type":"address"},{"indexed":false,"name":"script","type":"bytes"},{"indexed":false,"name":"input","type":"bytes"},{"indexed":false,"name":"returnData","type":"bytes"}],"name":"ScriptResult","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"vault","type":"address"},{"indexed":true,"name":"token","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"RecoverToVault","type":"event"},{"constant":false,"inputs":[{"name":"root","type":"address"},{"name":"_appIds","type":"bytes32[4]"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getTokenContract","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"coreContributorsCount","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint32"},{"name":"oldAccount","type":"address"},{"name":"newAccount","type":"address"}],"name":"updateContributorAccount","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint32"},{"name":"ipfsHash","type":"bytes32"},{"name":"hashFunction","type":"uint8"},{"name":"hashSize","type":"uint8"}],"name":"updateContributorIpfsHash","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"funct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\ No newline at end of file
+[{"constant":true,"inputs":[],"name":"hasInitialized","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_script","type":"bytes"}],"name":"getEVMScriptExecutor","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getRecoveryVault","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"contributorsCount","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"token","type":"address"}],"name":"allowRecoverability","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"appId","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getInitializationBlock","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"contributorIds","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"KERNEL_APP_ADDR_NAMESPACE","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_token","type":"address"}],"name":"transferToVault","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"MANAGE_CONTRIBUTORS_ROLE","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint32"}],"name":"contributors","outputs":[{"name":"account","type":"address"},{"name":"ipfsHash","type":"bytes32"},{"name":"hashFunction","type":"uint8"},{"name":"hashSize","type":"uint8"},{"name":"exists","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getEVMScriptRegistry","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"kernel","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isPetrified","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"appIds","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"id","type":"uint32"},{"indexed":false,"name":"oldIpfsHash","type":"bytes32"},{"indexed":false,"name":"newIpfsHash","type":"bytes32"}],"name":"ContributorProfileUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"id","type":"uint32"},{"indexed":false,"name":"oldAccount","type":"address"},{"indexed":false,"name":"newAccount","type":"address"}],"name":"ContributorAccountUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"id","type":"uint32"},{"indexed":false,"name":"account","type":"address"}],"name":"ContributorAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"executor","type":"address"},{"indexed":false,"name":"script","type":"bytes"},{"indexed":false,"name":"input","type":"bytes"},{"indexed":false,"name":"returnData","type":"bytes"}],"name":"ScriptResult","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"vault","type":"address"},{"indexed":true,"name":"token","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"RecoverToVault","type":"event"},{"constant":false,"inputs":[{"name":"root","type":"address"},{"name":"_appIds","type":"bytes32[4]"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getTokenContract","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"coreContributorsCount","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint32"},{"name":"oldAccount","type":"address"},{"name":"newAccount","type":"address"}],"name":"updateContributorAccount","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"id","type":"uint32"},{"name":"ipfsHash","type":"bytes32"},{"name":"hashFunction","type":"uint8"},{"name":"hashSize","type":"uint8"}],"name":"updateContributorIpfsHash","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"account","type":"address"},{"name":"ipfsHash","type":"bytes32"},{"name":"hashFunction","type":"uint8"},{"name":"hashSize","type":"uint8"}],"name":"addContributor","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"id","type":"uint32"}],"name":"isCoreTeam","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"id","type":"uint32"}],"name":"exists","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"addressIsCore","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"addressExists","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"getContributorIdByAddress","outputs":[{"name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"id","type":"uint32"}],"name":"getContributorAddressById","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_id","type":"uint32"}],"name":"getContributorById","outputs":[{"name":"id","type":"uint32"},{"name":"account","type":"address"},{"name":"ipfsHash","type":"bytes32"},{"name":"hashFunction","type":"uint8"},{"name":"hashSize","type":"uint8"},{"name":"isCore","type":"bool"},{"name":"balance","type":"uint256"},{"name":"exists","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_who","type":"address"},{"name":"_where","type":"address"},{"name":"_what","type":"bytes32"}],"name":"canPerform","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_sender","type":"address"},{"name":"_role","type":"bytes32"},{"name":"_params","type":"uint256[]"}],"name":"canPerform","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"}]
\ No newline at end of file
diff --git a/lib/contracts/contributor.js b/lib/contracts/contributor.js
index 029f7ef..a3dec37 100644
--- a/lib/contracts/contributor.js
+++ b/lib/contracts/contributor.js
@@ -67,7 +67,6 @@ class Contributor extends Base {
           ipfsHashAttr.hashDigest,
           ipfsHashAttr.hashFunction,
           ipfsHashAttr.hashSize,
-          contributorAttr.isCore,
         ];
 
         return this.functions.addContributor(...contributor, callOptions);
diff --git a/scripts/add-contributor.js b/scripts/add-contributor.js
index ced62af..a3f632f 100644
--- a/scripts/add-contributor.js
+++ b/scripts/add-contributor.js
@@ -23,7 +23,6 @@ module.exports = async function(callback) {
   let contributorAttributes = {
     account: await prompt('Contributor address: ', {}),
     name: await prompt('Name: '),
-    isCore: await prompt('core? y/n') === 'y',
     kind: await prompt('Kind (default person): ', {default: 'person'}),
     url: await prompt('URL: '),
     github_username: await prompt('GitHub username: '),
@@ -34,7 +33,7 @@ module.exports = async function(callback) {
   console.log("\nAdding contributor:");
   console.log(contributorAttributes);
 
-  kredits.Contributor.add(contributorAttributes, { gasLimit: 250000 }).then((result) => {
+  kredits.Contributor.add(contributorAttributes, { gasLimit: 350000 }).then((result) => {
     console.log("\n\nResult:");
     console.log(result);
     callback();