diff --git a/src/models/ValuePair.ts b/src/models/ValuePair.ts
new file mode 100644
index 0000000..6a5e358
--- /dev/null
+++ b/src/models/ValuePair.ts
@@ -0,0 +1,4 @@
+export default class ValuePair {
+    public type: string
+    public value: any
+}
diff --git a/src/ocean/Ocean.ts b/src/ocean/Ocean.ts
index eb40cd9..d9e65b1 100644
--- a/src/ocean/Ocean.ts
+++ b/src/ocean/Ocean.ts
@@ -95,7 +95,6 @@ export default class Ocean {
             ],
         })
 
-
         await AquariusProvider.getAquarius().storeDDO(ddo)
         asset.setId(assetId)
 
diff --git a/src/ocean/ServiceAgreement.ts b/src/ocean/ServiceAgreement.ts
index f621cec..06d7721 100644
--- a/src/ocean/ServiceAgreement.ts
+++ b/src/ocean/ServiceAgreement.ts
@@ -2,6 +2,7 @@ import DDO from "../ddo/DDO"
 import AccessConditions from "../keeper/contracts/conditions/AccessConditions"
 import ServiceAgreementContract from "../keeper/contracts/ServiceAgreement"
 import Web3Provider from "../keeper/Web3Provider"
+import ValuePair from "../models/ValuePair"
 import Account from "./Account"
 import OceanBase from "./OceanBase"
 
@@ -11,23 +12,13 @@ export default class ServiceAgreement extends OceanBase {
                                                publisher: Account):
         Promise<ServiceAgreement> {
 
-        const timeoutValues: number[] = ddo.service[0].conditions.map((condition) => {
-            return condition.timeout
-        })
-
-        // todo: this should come from ddo
-        const values = [
-            {type: "bool", value: true},
-            {type: "bool", value: false},
-            {type: "uint", value: 120},
-            {type: "string", value: serviceAgreementId},
-        ]
+        const timeoutValues: number[] = ServiceAgreement.getTimeoutValuesFromDDO(ddo)
 
         const serviceAgreementHashSignature = await ServiceAgreement.createSAHashSignature(ddo, serviceAgreementId,
             consumer)
 
         const serviceAgreement: ServiceAgreement = await ServiceAgreement.signServiceAgreement(ddo,
-            serviceAgreementId, values, timeoutValues, serviceAgreementHashSignature, consumer, publisher)
+            serviceAgreementId, timeoutValues, serviceAgreementHashSignature, consumer, publisher)
 
         return serviceAgreement
     }
@@ -35,23 +26,14 @@ export default class ServiceAgreement extends OceanBase {
     public static async createSAHashSignature(ddo: DDO, serviceAgreementId: string, consumer: Account):
         Promise<string> {
 
-        // todo get from ddo
-        const values = [
-            {type: "bool", value: true},
-            {type: "bool", value: false},
-            {type: "uint", value: 120},
-            {type: "string", value: serviceAgreementId},
-        ]
-
+        const values: ValuePair[] = ServiceAgreement.getValuesFromDDO(ddo, serviceAgreementId)
         const valueHashes = ServiceAgreement.createValueHashes(values)
 
         const conditionKeys: string[] = ddo.service[0].conditions.map((condition) => {
             return condition.conditionKey
         })
 
-        const timeoutValues: number[] = ddo.service[0].conditions.map((condition) => {
-            return condition.timeout
-        })
+        const timeoutValues: number[] = ServiceAgreement.getTimeoutValuesFromDDO(ddo)
 
         const serviceAgreementHash = ServiceAgreement.hashServiceAgreement(ddo.service[0].templateId,
             serviceAgreementId, conditionKeys, valueHashes, timeoutValues)
@@ -62,11 +44,11 @@ export default class ServiceAgreement extends OceanBase {
         return serviceAgreementHashSignature
     }
 
-    private static async signServiceAgreement(ddo: DDO, serviceAgreementId: string, values: any[],
-                                              timeoutValues: number[], serviceAgreementHashSignature: string,
-                                              consumer: Account, publisher: Account):
-        Promise<ServiceAgreement> {
+    private static async signServiceAgreement(ddo: DDO, serviceAgreementId: string, timeoutValues: number[],
+                                              serviceAgreementHashSignature: string, consumer: Account,
+                                              publisher: Account): Promise<ServiceAgreement> {
 
+        const values: ValuePair[] = ServiceAgreement.getValuesFromDDO(ddo, serviceAgreementId)
         const valueHashes = ServiceAgreement.createValueHashes(values)
         const serviceAgreement: ServiceAgreementContract = await ServiceAgreementContract.getInstance()
         const executeAgreementReceipt = await serviceAgreement.executeAgreement(
@@ -87,30 +69,48 @@ export default class ServiceAgreement extends OceanBase {
         )
     }
 
-    private static createValueHashes(values: any[]): any[] {
-        return values.map((value) => {
-            return ServiceAgreement.hashSingleValue(value.type, value.value)
+    private static createValueHashes(valuePairs: ValuePair[]): any[] {
+        return valuePairs.map((valuePair) => {
+            return ServiceAgreement.hashSingleValue(valuePair)
         })
     }
 
-    private static hashSingleValue(type: string, value: any): string {
-        const args = {type, value}
-        return Web3Provider.getWeb3().utils.soliditySha3(args).toString("hex")
+    private static hashSingleValue(data: ValuePair): string {
+        return Web3Provider.getWeb3().utils.soliditySha3(data).toString("hex")
     }
 
     private static hashServiceAgreement(serviceAgreementTemplateId: string, serviceAgreementId: string,
                                         conditionKeys: string[], valueHashes: string[], timeouts: number[]) {
         const args = [
-            {type: "bytes32", value: serviceAgreementTemplateId},
-            {type: "bytes32[]", value: conditionKeys},
-            {type: "bytes32[]", value: valueHashes},
-            {type: "uint256[]", value: timeouts},
-            {type: "bytes32", value: serviceAgreementId},
+            {type: "bytes32", value: serviceAgreementTemplateId} as ValuePair,
+            {type: "bytes32[]", value: conditionKeys} as ValuePair,
+            {type: "bytes32[]", value: valueHashes} as ValuePair,
+            {type: "uint256[]", value: timeouts} as ValuePair,
+            {type: "bytes32", value: serviceAgreementId} as ValuePair,
         ]
 
         return Web3Provider.getWeb3().utils.soliditySha3(...args).toString("hex")
     }
 
+    private static getTimeoutValuesFromDDO(ddo: DDO): number[] {
+        const timeoutValues: number[] = ddo.service[0].conditions.map((condition) => {
+            return condition.timeout
+        })
+
+        return timeoutValues
+    }
+
+    private static getValuesFromDDO(ddo: DDO, serviceAgreementId: string): ValuePair[] {
+        const values: ValuePair[] = [
+            {type: "bool", value: true} as ValuePair,
+            {type: "bool", value: false} as ValuePair,
+            {type: "uint", value: 120} as ValuePair,
+            {type: "string", value: serviceAgreementId} as ValuePair,
+        ]
+
+        return values
+    }
+
     private constructor(serviceAgreementId: string, ddo: DDO, private publisher: Account, consumer: Account,
                         state: boolean, status: boolean) {
         super(serviceAgreementId)