diff --git a/config/seeds.js b/config/seeds.js
index a2c54a0..751b8da 100644
--- a/config/seeds.js
+++ b/config/seeds.js
@@ -31,18 +31,55 @@ const contractCalls = [
     wiki_username: 'Manuel',
   }, { gasLimit: 200000 }]],
 
-  ['Contribution', 'add', [{ contributorId: 1, contributorIpfsHash: 'QmWKCYGr2rSf6abUPaTYqf98urvoZxGrb7dbspFZA6oyVF', date: '2019-04-11', amount: 500, kind: 'dev', description: '[67P/kredits-contracts] Test this thing', url: '' }, { gasLimit: 350000 }]],
-  ['Contribution', 'add', [{ contributorId: 2, contributorIpfsHash: 'QmcHzEeAM26HV2zHTf5HnZrCtCtGdEccL5kUtDakAB7ozB', date: '2019-04-11', amount: 1500, kind: 'dev', description: '[67P/kredits-web] Reviewed stuff', url: '' }, { gasLimit: 350000 }]],
-  ['Contribution', 'add', [{ contributorId: 1, contributorIpfsHash: 'QmWKCYGr2rSf6abUPaTYqf98urvoZxGrb7dbspFZA6oyVF', date: '2019-04-11', amount: 5000, kind: 'dev', description: '[67P/kredits-contracts] Add tests', url: '' }, { gasLimit: 350000 }]],
-  ['Contribution', 'add', [{ contributorId: 1, contributorIpfsHash: 'QmWKCYGr2rSf6abUPaTYqf98urvoZxGrb7dbspFZA6oyVF', date: '2019-04-11', amount: 1500, kind: 'dev', description: '[67P/kredits-contracts] Introduce contribution token', url: '' }, { gasLimit: 350000 }]],
-  ['Contribution', 'add', [{ contributorId: 2, contributorIpfsHash: 'QmcHzEeAM26HV2zHTf5HnZrCtCtGdEccL5kUtDakAB7ozB', date: '2019-04-11', amount: 5000, kind: 'dev', description: '[67P/kredits-web] Expense UI, first draft', url: '' }, { gasLimit: 350000 }]],
+  ['Contribution', 'add', [{
+    contributorId: 1, contributorIpfsHash: 'QmWKCYGr2rSf6abUPaTYqf98urvoZxGrb7dbspFZA6oyVF',
+    date: '2019-04-11', amount: 500, kind: 'dev',
+    description: '[67P/kredits-contracts] Test this thing',
+    url: '',
+    confirmedAtBlock: 1,
+  }, { gasLimit: 350000 }]],
 
-  ['Reimbursement', 'add', [{amount: 1116000, recipientId: 1, token: '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599', expenses: [
+  ['Contribution', 'add', [{
+    contributorId: 2, contributorIpfsHash: 'QmcHzEeAM26HV2zHTf5HnZrCtCtGdEccL5kUtDakAB7ozB',
+    date: '2019-04-11', amount: 1500, kind: 'dev',
+    description: '[67P/kredits-web] Reviewed stuff',
+    url: '',
+    confirmedAtBlock: 1,
+  }, { gasLimit: 350000 }]],
+
+  ['Contribution', 'add', [{
+    contributorId: 1, contributorIpfsHash: 'QmWKCYGr2rSf6abUPaTYqf98urvoZxGrb7dbspFZA6oyVF',
+    date: '2019-04-11', amount: 5000, kind: 'dev',
+    description: '[67P/kredits-contracts] Add tests',
+    url: '',
+    confirmedAtBlock: 1,
+  }, { gasLimit: 350000 }]],
+
+  ['Contribution', 'add', [{
+    contributorId: 1, contributorIpfsHash: 'QmWKCYGr2rSf6abUPaTYqf98urvoZxGrb7dbspFZA6oyVF',
+    date: '2019-04-11', amount: 1500, kind: 'dev',
+    description: '[67P/kredits-contracts] Introduce contribution token',
+    url: '',
+  }, { gasLimit: 350000 }]],
+
+  ['Contribution', 'add', [{
+    contributorId: 2, contributorIpfsHash: 'QmcHzEeAM26HV2zHTf5HnZrCtCtGdEccL5kUtDakAB7ozB',
+    date: '2019-04-11', amount: 1500, kind: 'design',
+    description: '[67P/kredits-web] Expense UI, first draft',
+    url: '',
+  }, { gasLimit: 350000 }]],
+
+  ['Reimbursement', 'add', [{ amount: 346800, recipientId: 2, token: '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599', expenses: [
+    { title: 'Domain kosmos.social', description: 'Yearly registration fee for domain kosmos.social', amount: 69.00, currency: 'EUR', date: '2020-04-30' },
+  ], confirmedAtBlock: 1 }, { gasLimit: 300000 }]],
+
+  ['Reimbursement', 'add', [{ amount: 1116000, recipientId: 1, token: '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599', expenses: [
     { title: 'Server rent', description: 'Dedicated server: andromeda.kosmos.org, April 2020', amount: 61, currency: 'EUR', date: '2020-05-28' },
-    { title: 'Server rent', description: 'Dedicated server: centaurus.kosmos.org, April 2020', amount: 32, currency: 'EUR', date: '2020-05-28' }
-  ]}, { gasLimit: 300000 }]],
-  ['Reimbursement', 'add', [{amount: 166800, recipientId: 2, token: '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599', expenses: [
-    { title: 'Domain kosmos.chat', description: 'Yearly registration fee for domain kosmos.chat', amount: 13.90, currency: 'EUR', date: '2020-05-30' }
+    { title: 'Server rent', description: 'Dedicated server: centaurus.kosmos.org, April 2020', amount: 32, currency: 'EUR', date: '2020-05-28' },
+  ], confirmedAtBlock: 1 }, { gasLimit: 300000 }]],
+
+  ['Reimbursement', 'add', [{ amount: 166800, recipientId: 2, token: '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599', expenses: [
+    { title: 'Domain kosmos.chat', description: 'Yearly registration fee for domain kosmos.chat', amount: 13.90, currency: 'EUR', date: '2020-05-30' },
   ]}, { gasLimit: 300000 }]],
 ];
 
diff --git a/lib/contracts/contribution.js b/lib/contracts/contribution.js
index f6648d9..4de447a 100644
--- a/lib/contracts/contribution.js
+++ b/lib/contracts/contribution.js
@@ -41,6 +41,8 @@ class Contribution extends Record {
 
   async add (contributionAttr, callOptions = {}) {
     const contribution = new ContributionSerializer(contributionAttr);
+    const confirmedAtBlock = contributionAttr.confirmedAtBlock || 0;
+    const vetoed = contributionAttr.vetoed || false;
 
     try { await contribution.validate(); }
     catch (error) { return Promise.reject(error); }
@@ -56,9 +58,11 @@ class Contribution extends Record {
           ipfsHashAttr.hashDigest,
           ipfsHashAttr.hashFunction,
           ipfsHashAttr.hashSize,
+          confirmedAtBlock,
+          vetoed,
         ];
 
-        return this.contract.add(...contribution, 0, false, callOptions);
+        return this.contract.add(...contribution, callOptions);
       });
   }
 
diff --git a/lib/contracts/reimbursement.js b/lib/contracts/reimbursement.js
index 391ae3e..f8e1618 100644
--- a/lib/contracts/reimbursement.js
+++ b/lib/contracts/reimbursement.js
@@ -23,6 +23,8 @@ class Reimbursement extends Record {
     const amount = parseInt(attrs.amount);
     const token = attrs.token;
     const recipientId = attrs.recipientId;
+    const confirmedAtBlock = attrs.confirmedAtBlock || 0;
+    const vetoed = attrs.vetoed || false;
     const expenses = attrs.expenses.map((e) => new ExpenseSerializer(e));
     let errorMessage;
 
@@ -56,6 +58,8 @@ class Reimbursement extends Record {
           ipfsHashAttr.hashDigest,
           ipfsHashAttr.hashFunction,
           ipfsHashAttr.hashSize,
+          confirmedAtBlock,
+          vetoed,
         ];
 
         return this.contract.add(...reimbursement, callOptions);