diff --git a/contracts/SNT.sol b/contracts/SNT.sol
index 134e260..e6cbecc 100644
--- a/contracts/SNT.sol
+++ b/contracts/SNT.sol
@@ -1,8 +1,8 @@
 pragma solidity ^0.5.0;
 
-import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
-import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
-import "openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20Mintable.sol";
 
 contract SNT is ERC20, ERC20Detailed, ERC20Mintable {
   uint private INITIAL_SUPPLY = 10000000000000000000000;
diff --git a/contracts/StakingPool.sol b/contracts/StakingPool.sol
index e81103f..6912cd0 100644
--- a/contracts/StakingPool.sol
+++ b/contracts/StakingPool.sol
@@ -1,10 +1,10 @@
 /* solium-disable security/no-block-members */
 /* solium-disable security/no-inline-assembly */
 pragma solidity >=0.5.0 <0.6.0;
-import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";
-import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
-import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
-import "openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
 import "./math.sol";
 import "./token/ApproveAndCallFallBack.sol";
 import "./token/MiniMeTokenInterface.sol";
diff --git a/contracts/StakingPoolDAO.sol b/contracts/StakingPoolDAO.sol
index b81d049..09af3e6 100644
--- a/contracts/StakingPoolDAO.sol
+++ b/contracts/StakingPoolDAO.sol
@@ -5,9 +5,10 @@ pragma solidity >=0.5.0 <0.6.0;
 
 import "./StakingPool.sol";
 import "./common/Controlled.sol";
-import "openzeppelin-solidity/contracts/drafts/ERC20Snapshot.sol";
+import "@openzeppelin/contracts/drafts/ERC20Snapshot.sol";
+import "@openzeppelin/contracts/GSN/GSNRecipient.sol";
 
-contract StakingPoolDAO is StakingPool, ERC20Snapshot, Controlled {
+contract StakingPoolDAO is StakingPool, GSNRecipient, ERC20Snapshot, Controlled {
 
   enum VoteStatus {NONE, YES, NO}
 
@@ -86,10 +87,12 @@ contract StakingPoolDAO is StakingPool, ERC20Snapshot, Controlled {
 
     require(proposal.voteEndingBlock > block.number, "Proposal has already ended");
 
-    uint voterBalance = balanceOfAt(msg.sender, proposal.snapshotId);
+    address sender = _msgSender();
+
+    uint voterBalance = balanceOfAt(sender, proposal.snapshotId);
     require(voterBalance > 0, "Not enough tokens at the moment of proposal creation");
 
-    VoteStatus oldVote = proposal.voters[msg.sender];
+    VoteStatus oldVote = proposal.voters[sender];
 
     if(oldVote != VoteStatus.NONE){ // Reset
       bool oldChoice = oldVote == VoteStatus.YES ? true : false;
@@ -99,9 +102,11 @@ contract StakingPoolDAO is StakingPool, ERC20Snapshot, Controlled {
     VoteStatus enumVote = choice ? VoteStatus.YES : VoteStatus.NO;
 
     proposal.votes[choice] += voterBalance;
-    proposal.voters[msg.sender] = enumVote;
+    proposal.voters[sender] = enumVote;
 
-    emit Vote(proposalId, msg.sender, enumVote);
+    lastActivity[sender] = block.timestamp;
+
+    emit Vote(proposalId, sender, enumVote);
   }
 
   // call has been separated into its own function in order to take advantage
@@ -164,4 +169,72 @@ contract StakingPoolDAO is StakingPool, ERC20Snapshot, Controlled {
   function() external payable {
     //
   }
+
+  enum GSNErrorCodes {
+    FUNCTION_NOT_AVAILABLE,
+    HAS_ETH_BALANCE,
+    GAS_PRICE,
+    TRX_TOO_SOON,
+    ALREADY_VOTED,
+    NO_TOKEN_BALANCE
+  }
+
+  bytes4 constant VOTE_SIGNATURE = bytes4(keccak256("vote(uint256,bool)"));
+
+  function acceptRelayedCall(
+      address relay,
+      address from,
+      bytes calldata encodedFunction,
+      uint256 transactionFee,
+      uint256 gasPrice,
+      uint256 gasLimit,
+      uint256 nonce,
+      bytes calldata approvalData,
+      uint256 maxPossibleCharge
+  ) external view returns (uint256, bytes memory) {
+
+    bytes memory abiEncodedFunc = encodedFunction; // Call data elements cannot be accessed directly
+    bytes4 functionSignature;
+    uint proposalId;
+
+    assembly {
+      functionSignature := mload(add(abiEncodedFunc, add(0x20, 0)))
+      proposalId := mload(add(abiEncodedFunc, 36))
+    }
+
+    return _evaluateConditions(from, functionSignature, proposalId, gasPrice);
+  }
+
+  function _evaluateConditions(
+    address _from,
+    bytes4 _functionSignature,
+    uint _proposalId,
+    uint _gasPrice
+  ) internal view returns (uint256, bytes memory) {
+    if(_functionSignature != VOTE_SIGNATURE) return _rejectRelayedCall(uint256(GSNErrorCodes.FUNCTION_NOT_AVAILABLE));
+
+    Proposal storage proposal = proposals[_proposalId];
+
+    if(balanceOfAt(_from, proposal.snapshotId) == 0) return _rejectRelayedCall(uint256(GSNErrorCodes.NO_TOKEN_BALANCE));
+
+    /* ?
+    if(from.balance > 600000 * gasPrice) return _rejectRelayedCall(uint256(GSNErrorCodes.HAS_ETH_BALANCE));
+    */
+
+    if(_gasPrice > 20000000000) return _rejectRelayedCall(uint256(GSNErrorCodes.GAS_PRICE)); // 20 gwei
+
+    if((lastActivity[_from] + 15 minutes) > block.timestamp) return _rejectRelayedCall(uint256(GSNErrorCodes.TRX_TOO_SOON));
+
+    if(proposal.voters[_from] != VoteStatus.NONE) return _rejectRelayedCall(uint256(GSNErrorCodes.ALREADY_VOTED));
+
+    return _approveRelayedCall();
+  }
+
+  mapping(address => uint) public lastActivity;
+
+  function _preRelayedCall(bytes memory context) internal returns (bytes32) {
+  }
+
+  function _postRelayedCall(bytes memory context, bool, uint256 actualCharge, bytes32) internal {
+  }
 }
diff --git a/package.json b/package.json
index ea63558..2e1e94a 100644
--- a/package.json
+++ b/package.json
@@ -22,12 +22,13 @@
     }
   ],
   "dependencies": {
+    "@openzeppelin/contracts": "^2.5.0",
+    "@openzeppelin/gsn-helpers": "^0.2.3",
     "embark": "5.2.3",
     "embark-geth": "5.2.3",
     "embark-solc": "5.2.3",
     "embark-solium": "0.1.0",
     "embarkjs": "5.2.3",
-    "embarkjs-web3": "5.2.3",
-    "openzeppelin-solidity": "^2.5.0"
+    "embarkjs-web3": "5.2.3"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 63dc582..85ef144 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -890,6 +890,26 @@
     number-to-bn "^1.7.0"
     rlp "^2.2.2"
 
+"@openzeppelin/contracts@^2.5.0":
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-2.5.0.tgz#e327a98ba1d26b7756ff62885a0aa0967a375449"
+  integrity sha512-t3jm8FrhL9tkkJTofkznTqo/XXdHi21w5yXwalEnaMOp22ZwZ0f/mmKdlgMMLPFa6bSVHbY88mKESwJT/7m5Lg==
+
+"@openzeppelin/gsn-helpers@^0.2.3":
+  version "0.2.3"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/gsn-helpers/-/gsn-helpers-0.2.3.tgz#b3f0295e29371ae4ed238501a958efd45d9f9d17"
+  integrity sha512-NRPFy6rbMfQWgvHW6jlJ0zg5L3wHrCZ9wKO2CmjszUZBwR3K1n8OfKNAXWEYiUArz0c7tP3qZuI7ifGb6dZvJg==
+  dependencies:
+    axios "^0.19.0"
+    chai "^4.2.0"
+    commander "^2.20.0"
+    env-paths "^2.2.0"
+    fs-extra "^8.1.0"
+    lodash "^4.17.15"
+    sleep-promise "^8.0.1"
+    tmp "^0.1.0"
+    web3 "^1.2.1"
+
 "@sindresorhus/is@^0.14.0":
   version "0.14.0"
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.14.0.tgz#9fb3a3cf3132328151f353de4632e01e52102bea"
@@ -1713,6 +1733,11 @@ assert@^1.1.1:
     object-assign "^4.1.1"
     util "0.10.3"
 
+assertion-error@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
+  integrity sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==
+
 assign-symbols@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
@@ -1814,6 +1839,13 @@ aws4@^1.8.0:
   resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.9.1.tgz#7e33d8f7d449b3f673cd72deb9abdc552dbe528e"
   integrity sha512-wMHVg2EOHaMRxbzgFJ9gtjOOCrI80OHLG14rxi28XwOW8ux6IiEbRCGGGqCtdAIg4FQCbW20k9RsT4y3gJlFug==
 
+axios@^0.19.0:
+  version "0.19.2"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.19.2.tgz#3ea36c5d8818d0d5f8a8a97a6d36b86cdc00cb27"
+  integrity sha512-fjgm5MvRHLhx+osE2xoekY70AhARk3a6hkN+3Io1jc00jtquGvxYlKlsFUhmUET0V5te6CcZI7lcv2Ym61mjHA==
+  dependencies:
+    follow-redirects "1.5.10"
+
 babel-code-frame@^6.16.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"
@@ -2352,6 +2384,18 @@ caseless@~0.12.0:
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
   integrity sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
 
+chai@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.2.0.tgz#760aa72cf20e3795e84b12877ce0e83737aa29e5"
+  integrity sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==
+  dependencies:
+    assertion-error "^1.1.0"
+    check-error "^1.0.2"
+    deep-eql "^3.0.1"
+    get-func-name "^2.0.0"
+    pathval "^1.1.0"
+    type-detect "^4.0.5"
+
 chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.3.2, chalk@^2.4.1, chalk@^2.4.2:
   version "2.4.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
@@ -2404,6 +2448,11 @@ change-case@^3.0.1:
     upper-case "^1.1.1"
     upper-case-first "^1.1.0"
 
+check-error@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.2.tgz#574d312edd88bb5dd8912e9286dd6c0aed4aac82"
+  integrity sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=
+
 checkpoint-store@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/checkpoint-store/-/checkpoint-store-1.1.0.tgz#04e4cb516b91433893581e6d4601a78e9552ea06"
@@ -3078,14 +3127,14 @@ debug@2.6.9, debug@^2.1.1, debug@^2.2.0, debug@^2.3.3, debug@^2.6.9:
   dependencies:
     ms "2.0.0"
 
-debug@3.1.0:
+debug@3.1.0, debug@=3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
   integrity sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==
   dependencies:
     ms "2.0.0"
 
-debug@3.2.6, debug@^3.0.0, debug@^3.1.0, debug@^3.2.6:
+debug@3.2.6, debug@^3.0.0, debug@^3.1.0:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
   integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
@@ -3162,16 +3211,18 @@ decompress@4.2.0, decompress@^4.0.0:
     pify "^2.3.0"
     strip-dirs "^2.0.0"
 
+deep-eql@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-3.0.1.tgz#dfc9404400ad1c8fe023e7da1df1c147c4b444df"
+  integrity sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==
+  dependencies:
+    type-detect "^4.0.0"
+
 deep-equal@1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/deep-equal/-/deep-equal-1.0.1.tgz#f5d260292b660e084eff4cdbc9f08ad3247448b5"
   integrity sha1-9dJgKStmDghO/0zbyfCK0yR0SLU=
 
-deep-extend@^0.6.0:
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
-  integrity sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==
-
 deep-is@~0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
@@ -3283,11 +3334,6 @@ detect-indent@^5.0.0:
   resolved "https://registry.yarnpkg.com/detect-indent/-/detect-indent-5.0.0.tgz#3871cc0a6a002e8c3e5b3cf7f336264675f06b9d"
   integrity sha1-OHHMCmoALow+Wzz38zYmRnXwa50=
 
-detect-libc@^1.0.2:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
-  integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
-
 diagnostics@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/diagnostics/-/diagnostics-1.1.1.tgz#cab6ac33df70c9d9a727490ae43ac995a769b22a"
@@ -4547,6 +4593,11 @@ enhanced-resolve@^4.1.0:
     memory-fs "^0.5.0"
     tapable "^1.0.0"
 
+env-paths@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/env-paths/-/env-paths-2.2.0.tgz#cdca557dc009152917d6166e2febe1f039685e43"
+  integrity sha512-6u0VYSCo/OW6IoD5WCLLy9JUGARbamfSavcNXry/eu8aHVFei6CD3Sw+VGX5alea1i9pgPHW0mbu6Xj0uBh7gA==
+
 env-variable@0.0.x:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/env-variable/-/env-variable-0.0.6.tgz#74ab20b3786c545b62b4a4813ab8cf22726c9808"
@@ -5628,6 +5679,13 @@ flush-write-stream@^1.0.0:
     inherits "^2.0.3"
     readable-stream "^2.3.6"
 
+follow-redirects@1.5.10:
+  version "1.5.10"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.5.10.tgz#7b7a9f9aea2fdff36786a94ff643ed07f4ff5e2a"
+  integrity sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==
+  dependencies:
+    debug "=3.1.0"
+
 follow-redirects@1.9.0:
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.9.0.tgz#8d5bcdc65b7108fe1508649c79c12d732dcedb4f"
@@ -5850,6 +5908,11 @@ get-caller-file@^2.0.1:
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-2.0.5.tgz#4f94412a82db32f36e3b0b9741f8a97feb031f7e"
   integrity sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==
 
+get-func-name@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.0.tgz#ead774abee72e20409433a066366023dd6887a41"
+  integrity sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=
+
 get-iterator@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/get-iterator/-/get-iterator-1.0.2.tgz#cd747c02b4c084461fac14f48f6b45a80ed25c82"
@@ -6462,7 +6525,7 @@ i18n@0.8.3:
     mustache "*"
     sprintf-js ">=1.0.3"
 
-iconv-lite@0.4.24, iconv-lite@^0.4.4:
+iconv-lite@0.4.24:
   version "0.4.24"
   resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.24.tgz#2022b4b25fbddc21d2f524974a474aafe733908b"
   integrity sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==
@@ -6498,13 +6561,6 @@ iferr@^0.1.5:
   resolved "https://registry.yarnpkg.com/iferr/-/iferr-0.1.5.tgz#c60eed69e6d8fdb6b3104a1fcbca1c192dc5b501"
   integrity sha1-xg7taebY/bazEEofy8ocGS3FtQE=
 
-ignore-walk@^3.0.1:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/ignore-walk/-/ignore-walk-3.0.3.tgz#017e2447184bfeade7c238e4aefdd1e8f95b1e37"
-  integrity sha512-m7o6xuOaT1aqheYHKf8W6J5pYH85ZI9w077erOzLje3JsB1gkafkAhHHY19dqjulgIZHFm32Cp5uNZgcQqdJKw==
-  dependencies:
-    minimatch "^3.0.4"
-
 ignore@^3.0.11, ignore@^3.0.9, ignore@^3.2.0:
   version "3.3.10"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.3.10.tgz#0a97fb876986e8081c631160f8f9f389157f0043"
@@ -6588,11 +6644,6 @@ inherits@2.0.3:
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
   integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
 
-ini@~1.3.0:
-  version "1.3.5"
-  resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
-  integrity sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
-
 inquirer@^0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/inquirer/-/inquirer-0.12.0.tgz#1ef2bfd63504df0bc75785fff8c2c41df12f077e"
@@ -8592,15 +8643,6 @@ natural-compare@^1.4.0:
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
   integrity sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=
 
-needle@^2.2.1:
-  version "2.3.3"
-  resolved "https://registry.yarnpkg.com/needle/-/needle-2.3.3.tgz#a041ad1d04a871b0ebb666f40baaf1fb47867117"
-  integrity sha512-EkY0GeSq87rWp1hoq/sH/wnTWgFVhYlnIkbJ0YJFfRgEFlz2RraCjBpFQ+vrEgEdp0ThfyHADmkChEhcb7PKyw==
-  dependencies:
-    debug "^3.2.6"
-    iconv-lite "^0.4.4"
-    sax "^1.2.4"
-
 negotiator@0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
@@ -8740,22 +8782,6 @@ node-object-hash@^1.2.0:
   resolved "https://registry.yarnpkg.com/node-object-hash/-/node-object-hash-1.4.2.tgz#385833d85b229902b75826224f6077be969a9e94"
   integrity sha512-UdS4swXs85fCGWWf6t6DMGgpN/vnlKeSGEQ7hJcrs7PBFoxoKLmibc3QRb7fwiYsjdL7PX8iI/TMSlZ90dgHhQ==
 
-node-pre-gyp@*:
-  version "0.14.0"
-  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.14.0.tgz#9a0596533b877289bcad4e143982ca3d904ddc83"
-  integrity sha512-+CvDC7ZttU/sSt9rFjix/P05iS43qHCOOGzcr3Ry99bXG7VX953+vFyEuph/tfqoYu8dttBkE86JSKBO2OzcxA==
-  dependencies:
-    detect-libc "^1.0.2"
-    mkdirp "^0.5.1"
-    needle "^2.2.1"
-    nopt "^4.0.1"
-    npm-packlist "^1.1.6"
-    npmlog "^4.0.2"
-    rc "^1.2.7"
-    rimraf "^2.6.1"
-    semver "^5.3.0"
-    tar "^4.4.2"
-
 node-releases@^1.1.50:
   version "1.1.52"
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.52.tgz#bcffee3e0a758e92e44ecfaecd0a47554b0bcba9"
@@ -8801,14 +8827,6 @@ nodeify@^1.0.1:
   dependencies:
     abbrev "1"
 
-nopt@^4.0.1:
-  version "4.0.3"
-  resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.3.tgz#a375cad9d02fd921278d954c2254d5aa57e15e48"
-  integrity sha512-CvaGwVMztSMJLOeXPrez7fyfObdZqNUK1cPAEzLHrTybIua9pMdmmPR5YwtfNftIOMv3DPUhFaxsZMNTQO20Kg==
-  dependencies:
-    abbrev "1"
-    osenv "^0.1.4"
-
 normalize-package-data@^2.3.2, normalize-package-data@^2.3.4:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
@@ -8836,27 +8854,6 @@ normalize-url@^4.1.0:
   resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-4.5.0.tgz#453354087e6ca96957bd8f5baf753f5982142129"
   integrity sha512-2s47yzUxdexf1OhyRi4Em83iQk0aPvwTddtFz4hnSSw9dCEsLEGf6SwIO8ss/19S9iBb5sJaOuTvTGDeZI00BQ==
 
-npm-bundled@^1.0.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/npm-bundled/-/npm-bundled-1.1.1.tgz#1edd570865a94cdb1bc8220775e29466c9fb234b"
-  integrity sha512-gqkfgGePhTpAEgUsGEgcq1rqPXA+tv/aVBlgEzfXwA1yiUJF7xtEt3CtVwOjNYQOVknDk0F20w58Fnm3EtG0fA==
-  dependencies:
-    npm-normalize-package-bin "^1.0.1"
-
-npm-normalize-package-bin@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/npm-normalize-package-bin/-/npm-normalize-package-bin-1.0.1.tgz#6e79a41f23fd235c0623218228da7d9c23b8f6e2"
-  integrity sha512-EPfafl6JL5/rU+ot6P3gRSCpPDW5VmIzX959Ob1+ySFUuuYHWHekXpwdUZcKP5C+DS4GEtdJluwBjnsNDl+fSA==
-
-npm-packlist@^1.1.6:
-  version "1.4.8"
-  resolved "https://registry.yarnpkg.com/npm-packlist/-/npm-packlist-1.4.8.tgz#56ee6cc135b9f98ad3d51c1c95da22bbb9b2ef3e"
-  integrity sha512-5+AZgwru5IevF5ZdnFglB5wNlHG1AOOuw28WhUq8/8emhBmLv6jX5by4WJCh7lW0uSYZYS6DXqIsyZVIXRZU9A==
-  dependencies:
-    ignore-walk "^3.0.1"
-    npm-bundled "^1.0.1"
-    npm-normalize-package-bin "^1.0.1"
-
 npm-run-path@^2.0.0:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
@@ -8864,7 +8861,7 @@ npm-run-path@^2.0.0:
   dependencies:
     path-key "^2.0.0"
 
-"npmlog@0 || 1 || 2 || 3 || 4", npmlog@4.1.2, npmlog@^4.0.0, npmlog@^4.0.2:
+"npmlog@0 || 1 || 2 || 3 || 4", npmlog@4.1.2, npmlog@^4.0.0:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   integrity sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==
@@ -9019,11 +9016,6 @@ open@6.4.0:
   dependencies:
     is-wsl "^1.1.0"
 
-openzeppelin-solidity@^2.5.0:
-  version "2.5.0"
-  resolved "https://registry.yarnpkg.com/openzeppelin-solidity/-/openzeppelin-solidity-2.5.0.tgz#829a9bcfc928619dd96c44bd893b180044ff51aa"
-  integrity sha512-I0yRC3nff9Kn2LDWuz02fuw0EuomVQ9Z8lHzdqh8P9BiOUzIk8frQRxn/a1Kva3StF6hwPP+Dh3/SQ2ily1Pow==
-
 optimist@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/optimist/-/optimist-0.6.1.tgz#da3ea74686fa21a19a111c326e90eb15a0196686"
@@ -9114,7 +9106,7 @@ os-tmpdir@^1.0.0, os-tmpdir@~1.0.2:
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
   integrity sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=
 
-osenv@0, osenv@^0.1.4:
+osenv@0:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.5.tgz#85cdfafaeb28e8677f416e287592b5f3f49ea410"
   integrity sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==
@@ -9405,6 +9397,11 @@ path-type@^4.0.0:
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
   integrity sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==
 
+pathval@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
+  integrity sha1-uULm1L3mUwBe9rcTYd74cn0GReA=
+
 pbkdf2@^3.0.3, pbkdf2@^3.0.9:
   version "3.0.17"
   resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.0.17.tgz#976c206530617b14ebb32114239f7b09336e93a6"
@@ -9907,16 +9904,6 @@ raw-body@2.4.0:
     iconv-lite "0.4.24"
     unpipe "1.0.0"
 
-rc@^1.2.7:
-  version "1.2.8"
-  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.8.tgz#cd924bf5200a075b83c188cd6b9e211b7fc0d3ed"
-  integrity sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==
-  dependencies:
-    deep-extend "^0.6.0"
-    ini "~1.3.0"
-    minimist "^1.2.0"
-    strip-json-comments "~2.0.1"
-
 read-pkg-up@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-1.0.1.tgz#9d63c13276c065918d57f002a57f40a1b643fb02"
@@ -10354,7 +10341,7 @@ ret@~0.1.10:
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
   integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
 
-rimraf@2, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@^2.6.3:
+rimraf@2, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.2, rimraf@^2.6.3:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
   integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
@@ -10491,11 +10478,6 @@ sass-loader@8.0.0:
     schema-utils "^2.1.0"
     semver "^6.3.0"
 
-sax@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
-  integrity sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==
-
 scandirectory@^2.5.0:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/scandirectory/-/scandirectory-2.5.0.tgz#6ce03f54a090b668e3cbedbf20edf9e310593e72"
@@ -10571,7 +10553,7 @@ semaphore@>=1.0.1, semaphore@^1.1.0:
   resolved "https://registry.yarnpkg.com/semaphore/-/semaphore-1.1.0.tgz#aaad8b86b20fe8e9b32b16dc2ee682a8cd26a8aa"
   integrity sha512-O4OZEaNtkMd/K0i6js9SL+gqy0ZCBMgUvlSqHKi4IBdjhe7wB8pwztUk1BbZ1fmrvpwFrPbHzqd2w5pTcJH6LA==
 
-"semver@2 || 3 || 4 || 5", semver@^5.3.0, semver@^5.4.1, semver@^5.5.0, semver@^5.5.1, semver@^5.6.0, semver@^5.7.0:
+"semver@2 || 3 || 4 || 5", semver@^5.4.1, semver@^5.5.0, semver@^5.5.1, semver@^5.6.0, semver@^5.7.0:
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
   integrity sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==
@@ -10833,6 +10815,11 @@ sinon@7.4.2:
     nise "^1.5.2"
     supports-color "^5.5.0"
 
+sleep-promise@^8.0.1:
+  version "8.0.1"
+  resolved "https://registry.yarnpkg.com/sleep-promise/-/sleep-promise-8.0.1.tgz#8d795a27ea23953df6b52b91081e5e22665993c5"
+  integrity sha1-jXlaJ+ojlT32tSuRCB5eImZZk8U=
+
 slice-ansi@0.0.4:
   version "0.0.4"
   resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-0.0.4.tgz#edbf8903f66f7ce2f8eafd6ceed65e264c831b35"
@@ -11479,7 +11466,7 @@ tar@^2.0.0:
     fstream "^1.0.12"
     inherits "2"
 
-tar@^4.0.2, tar@^4.4.2:
+tar@^4.0.2:
   version "4.4.13"
   resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.13.tgz#43b364bc52888d555298637b10d60790254ab525"
   integrity sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==
@@ -11584,6 +11571,13 @@ tmp@0.0.33:
   dependencies:
     os-tmpdir "~1.0.2"
 
+tmp@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/tmp/-/tmp-0.1.0.tgz#ee434a4e22543082e294ba6201dcc6eafefa2877"
+  integrity sha512-J7Z2K08jbGcdA1kkQpJSqLF6T0tdQqpR2pnSUXsIchbPdTI9v3e85cLW0d6WDhwuAleOV71j2xWs8qMPfK7nKw==
+  dependencies:
+    rimraf "^2.6.3"
+
 to-arraybuffer@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz#7d229b1fcc637e466ca081180836a7aabff83f43"
@@ -11719,7 +11713,7 @@ type-check@~0.3.2:
   dependencies:
     prelude-ls "~1.1.2"
 
-type-detect@4.0.8:
+type-detect@4.0.8, type-detect@^4.0.0, type-detect@^4.0.5:
   version "4.0.8"
   resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"
   integrity sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==
@@ -12317,7 +12311,7 @@ web3-utils@1.2.6:
     underscore "1.9.1"
     utf8 "3.0.0"
 
-web3@1.2.6, web3@^1.2.4:
+web3@1.2.6, web3@^1.2.1, web3@^1.2.4:
   version "1.2.6"
   resolved "https://registry.yarnpkg.com/web3/-/web3-1.2.6.tgz#c497dcb14cdd8d6d9fb6b445b3b68ff83f8ccf68"
   integrity sha512-tpu9fLIComgxGrFsD8LUtA4s4aCZk7px8UfcdEy6kS2uDi/ZfR07KJqpXZMij7Jvlq+cQrTAhsPSiBVvoMaivA==