diff --git a/backend/src/federation/client/1_0/AuthenticationClient.ts b/backend/src/federation/client/1_0/AuthenticationClient.ts
index b504c0030..5d897093e 100644
--- a/backend/src/federation/client/1_0/AuthenticationClient.ts
+++ b/backend/src/federation/client/1_0/AuthenticationClient.ts
@@ -1,11 +1,11 @@
 import { FederatedCommunity as DbFederatedCommunity } from 'database'
 import { GraphQLClient } from 'graphql-request'
 
-import { ensureUrlEndsWithSlash } from '@/util/utilities'
+import { ensureUrlEndsWithSlash } from 'core'
 
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
+import { EncryptedTransferArgs } from 'core'
 import { getLogger } from 'log4js'
-import { EncryptedTransferArgs } from 'core/src/graphql/model/EncryptedTransferArgs'
 import { openConnection } from './query/openConnection'
 
 const logger = getLogger(`${LOG4JS_BASE_CATEGORY_NAME}.federation.client.1_0.AuthenticationClient`)
diff --git a/backend/src/federation/client/1_0/DisbursementClient.ts b/backend/src/federation/client/1_0/DisbursementClient.ts
index bf466feef..abaf1818b 100644
--- a/backend/src/federation/client/1_0/DisbursementClient.ts
+++ b/backend/src/federation/client/1_0/DisbursementClient.ts
@@ -1,8 +1,7 @@
 import { FederatedCommunity as DbFederatedCommunity } from 'database'
 import { GraphQLClient } from 'graphql-request'
 
-import { LogError } from '@/server/LogError'
-import { ensureUrlEndsWithSlash } from 'core/src/util/utilities'
+import { ensureUrlEndsWithSlash } from 'core'
 import { getLogger } from 'log4js'
 
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
diff --git a/backend/src/federation/client/1_0/FederationClient.ts b/backend/src/federation/client/1_0/FederationClient.ts
index 525765803..c437ad085 100644
--- a/backend/src/federation/client/1_0/FederationClient.ts
+++ b/backend/src/federation/client/1_0/FederationClient.ts
@@ -4,7 +4,7 @@ import { GraphQLClient } from 'graphql-request'
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
 import { getPublicCommunityInfo } from '@/federation/client/1_0/query/getPublicCommunityInfo'
 import { getPublicKey } from '@/federation/client/1_0/query/getPublicKey'
-import { ensureUrlEndsWithSlash } from 'core/src/util/utilities'
+import { ensureUrlEndsWithSlash } from 'core'
 import { getLogger } from 'log4js'
 
 import { PublicCommunityInfoLoggingView } from './logging/PublicCommunityInfoLogging.view'
diff --git a/backend/src/graphql/model/Transaction.ts b/backend/src/graphql/model/Transaction.ts
index ee7250271..0560cef54 100644
--- a/backend/src/graphql/model/Transaction.ts
+++ b/backend/src/graphql/model/Transaction.ts
@@ -2,9 +2,8 @@ import { Transaction as dbTransaction } from 'database'
 import { Decimal } from 'decimal.js-light'
 import { Field, Int, ObjectType } from 'type-graphql'
 
-import { TransactionTypeId } from 'core/src/graphql/enum/TransactionTypeId'
+import { Decay, TransactionTypeId } from 'core'
 
-import { Decay } from './Decay'
 import { User } from './User'
 
 @ObjectType()
diff --git a/backend/src/graphql/resolver/BalanceResolver.ts b/backend/src/graphql/resolver/BalanceResolver.ts
index f7388c027..d49c73c39 100644
--- a/backend/src/graphql/resolver/BalanceResolver.ts
+++ b/backend/src/graphql/resolver/BalanceResolver.ts
@@ -7,14 +7,14 @@ import { Balance } from '@model/Balance'
 
 import { RIGHTS } from '@/auth/RIGHTS'
 import { BalanceLoggingView } from '@/logging/BalanceLogging.view'
-import { DecayLoggingView } from '@/logging/DecayLogging.view'
+import { DecayLoggingView } from 'core/src/graphql/logging/DecayLogging.view'
 import { Context, getUser } from '@/server/context'
 import { calculateDecay } from 'shared'
 
 import { getLogger } from 'log4js'
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
 import { GdtResolver } from './GdtResolver'
-import { getLastTransaction } from './util/getLastTransaction'
+import { getLastTransaction } from 'database'
 import { transactionLinkSummary } from './util/transactionLinkSummary'
 
 @Resolver()
diff --git a/backend/src/graphql/resolver/ContributionResolver.ts b/backend/src/graphql/resolver/ContributionResolver.ts
index 6e2a302ba..263c5c4aa 100644
--- a/backend/src/graphql/resolver/ContributionResolver.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.ts
@@ -42,7 +42,7 @@ import {
 import { UpdateUnconfirmedContributionContext } from '@/interactions/updateUnconfirmedContribution/UpdateUnconfirmedContribution.context'
 import { LogError } from '@/server/LogError'
 import { Context, getClientTimezoneOffset, getUser } from '@/server/context'
-import { TRANSACTIONS_LOCK } from '@/util/TRANSACTIONS_LOCK'
+import { TRANSACTIONS_LOCK } from 'database'
 import { fullName } from 'core'
 import { calculateDecay, Decay } from 'shared'
 
@@ -58,7 +58,7 @@ import {
 import { getOpenCreations, getUserCreation, validateContribution } from './util/creations'
 import { extractGraphQLFields } from './util/extractGraphQLFields'
 import { findContributions } from './util/findContributions'
-import { getLastTransaction } from './util/getLastTransaction'
+import { getLastTransaction } from 'database'
 import { sendTransactionsToDltConnector } from './util/sendTransactionsToDltConnector'
 
 const db = AppDatabase.getInstance()
diff --git a/backend/src/graphql/resolver/TransactionLinkResolver.test.ts b/backend/src/graphql/resolver/TransactionLinkResolver.test.ts
index 7862f71f0..658d74186 100644
--- a/backend/src/graphql/resolver/TransactionLinkResolver.test.ts
+++ b/backend/src/graphql/resolver/TransactionLinkResolver.test.ts
@@ -32,7 +32,7 @@ import { listTransactionLinksAdmin } from '@/seeds/graphql/queries'
 import { transactionLinks } from '@/seeds/transactionLink/index'
 import { bibiBloxberg } from '@/seeds/users/bibi-bloxberg'
 import { peterLustig } from '@/seeds/users/peter-lustig'
-import { TRANSACTIONS_LOCK } from '@/util/TRANSACTIONS_LOCK'
+import { TRANSACTIONS_LOCK } from 'database'
 
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
 import { getLogger } from 'config-schema/test/testSetup'
diff --git a/backend/src/graphql/resolver/TransactionLinkResolver.ts b/backend/src/graphql/resolver/TransactionLinkResolver.ts
index 546d11124..cf601a300 100644
--- a/backend/src/graphql/resolver/TransactionLinkResolver.ts
+++ b/backend/src/graphql/resolver/TransactionLinkResolver.ts
@@ -7,12 +7,11 @@ import { ContributionCycleType } from '@enum/ContributionCycleType'
 import { ContributionStatus } from '@enum/ContributionStatus'
 import { ContributionType } from '@enum/ContributionType'
 import { ContributionLink } from '@model/ContributionLink'
-import { Decay } from '@model/Decay'
 import { RedeemJwtLink } from '@model/RedeemJwtLink'
 import { TransactionLink, TransactionLinkResult } from '@model/TransactionLink'
 import { User } from '@model/User'
 import { QueryLinkResult } from '@union/QueryLinkResult'
-import { TransactionTypeId } from 'core'
+import { Decay, TransactionTypeId } from 'core'
 import {
   AppDatabase, Community as DbCommunity, Contribution as DbContribution,
   ContributionLink as DbContributionLink, FederatedCommunity as DbFederatedCommunity, Transaction as DbTransaction,
@@ -32,16 +31,16 @@ import {
 } from '@/event/Events'
 import { LogError } from '@/server/LogError'
 import { Context, getClientTimezoneOffset, getUser } from '@/server/context'
-import { TRANSACTIONS_LOCK } from '@/util/TRANSACTIONS_LOCK'
-import { TRANSACTION_LINK_LOCK } from '@/util/TRANSACTION_LINK_LOCK'
 import { calculateBalance } from '@/util/validate'
 import { fullName } from 'core'
+import { TRANSACTION_LINK_LOCK, TRANSACTIONS_LOCK } from 'database'
 import { calculateDecay, decode, DisburseJwtPayloadType, encode, encryptAndSign, RedeemJwtPayloadType, verify } from 'shared'
 
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
 import { DisbursementClient as V1_0_DisbursementClient } from '@/federation/client/1_0/DisbursementClient'
 import { DisbursementClientFactory } from '@/federation/client/DisbursementClientFactory'
 import { EncryptedTransferArgs } from 'core'
+import { getLastTransaction } from 'database'
 import { getLogger, Logger } from 'log4js'
 import { randombytes_random } from 'sodium-native'
 import { executeTransaction } from './TransactionResolver'
@@ -50,7 +49,6 @@ import {
   getCommunityByUuid,
 } from './util/communities'
 import { getUserCreation, validateContribution } from './util/creations'
-import { getLastTransaction } from './util/getLastTransaction'
 import { sendTransactionsToDltConnector } from './util/sendTransactionsToDltConnector'
 import { transactionLinkList } from './util/transactionLinkList'
 
diff --git a/backend/src/graphql/resolver/TransactionResolver.test.ts b/backend/src/graphql/resolver/TransactionResolver.test.ts
index e39fcefc4..e844ed0a5 100644
--- a/backend/src/graphql/resolver/TransactionResolver.test.ts
+++ b/backend/src/graphql/resolver/TransactionResolver.test.ts
@@ -13,12 +13,12 @@ import { v4 as uuidv4 } from 'uuid'
 
 import { cleanDB, testEnvironment } from '@test/helpers'
 
-import { CONFIG } from '@/config'
+// import { CONFIG } from '@/config'
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
 import { EventType } from '@/event/Events'
-import { SendCoinsClient } from 'core/src/federation/client/1_0/SendCoinsClient'
-import { SendCoinsArgs } from 'core/src/federation/client/1_0/model/SendCoinsArgs'
-import { SendCoinsResult } from 'core/src/federation/client/1_0/model/SendCoinsResult'
+// import { V1_0_SendCoinsClient } from 'core'
+// import { SendCoinsArgs } from 'core'
+// import { SendCoinsResult } from 'core'
 import { userFactory } from '@/seeds/factory/user'
 import {
   confirmContribution,
diff --git a/backend/src/graphql/resolver/TransactionResolver.ts b/backend/src/graphql/resolver/TransactionResolver.ts
index 5ceef0836..23e9f415f 100644
--- a/backend/src/graphql/resolver/TransactionResolver.ts
+++ b/backend/src/graphql/resolver/TransactionResolver.ts
@@ -17,7 +17,7 @@ import { Order } from '@enum/Order'
 import { Transaction } from '@model/Transaction'
 import { TransactionList } from '@model/TransactionList'
 import { User } from '@model/User'
-import { TransactionTypeId } from 'core/src/graphql/enum/TransactionTypeId'
+import { TransactionTypeId } from 'core'
 import { SendCoinsResponseJwtPayloadType } from 'shared'
 
 import { RIGHTS } from '@/auth/RIGHTS'
@@ -29,7 +29,7 @@ import {
 import { EVENT_TRANSACTION_RECEIVE, EVENT_TRANSACTION_SEND } from '@/event/Events'
 import { LogError } from '@/server/LogError'
 import { Context, getUser } from '@/server/context'
-import { TRANSACTIONS_LOCK } from '@/util/TRANSACTIONS_LOCK'
+import { TRANSACTIONS_LOCK } from 'database'
 import { communityUser } from '@/util/communityUser'
 import { calculateBalance } from '@/util/validate'
 import { virtualDecayTransaction, virtualLinkTransaction } from '@/util/virtualTransactions'
@@ -44,7 +44,7 @@ import { getLogger, Logger } from 'log4js'
 import { BalanceResolver } from './BalanceResolver'
 import { GdtResolver } from './GdtResolver'
 import { getCommunityByIdentifier, getCommunityName, isHomeCommunity } from './util/communities'
-import { getLastTransaction } from './util/getLastTransaction'
+import { getLastTransaction } from 'database'
 import { getTransactionList } from './util/getTransactionList'
 import { sendTransactionsToDltConnector } from './util/sendTransactionsToDltConnector'
 import { storeForeignUser } from './util/storeForeignUser'
diff --git a/backend/src/util/validate.ts b/backend/src/util/validate.ts
index 1dd8a4529..1190e32aa 100644
--- a/backend/src/util/validate.ts
+++ b/backend/src/util/validate.ts
@@ -2,9 +2,9 @@ import { TransactionLink as dbTransactionLink } from 'database'
 import { Decimal } from 'decimal.js-light'
 import { validate, version } from 'uuid'
 
-import { Decay } from '@model/Decay'
+import { Decay } from 'core'
 
-import { getLastTransaction } from '@/graphql/resolver/util/getLastTransaction'
+import { getLastTransaction } from 'database'
 import { transactionLinkSummary } from '@/graphql/resolver/util/transactionLinkSummary'
 
 import { calculateDecay } from 'shared'
diff --git a/core/src/federation/client/1_0/SendCoinsClient.ts b/core/src/federation/client/1_0/SendCoinsClient.ts
index f4b6d49d8..bb8d2c858 100644
--- a/core/src/federation/client/1_0/SendCoinsClient.ts
+++ b/core/src/federation/client/1_0/SendCoinsClient.ts
@@ -9,7 +9,7 @@ import { revertSendCoins as revertSendCoinsQuery } from './query/revertSendCoins
 import { revertSettledSendCoins as revertSettledSendCoinsQuery } from './query/revertSettledSendCoins'
 import { settleSendCoins as settleSendCoinsQuery } from './query/settleSendCoins'
 import { voteForSendCoins as voteForSendCoinsQuery } from './query/voteForSendCoins'
-import { EncryptedTransferArgs } from 'core'
+import { EncryptedTransferArgs } from '@graphql/model/EncryptedTransferArgs'
 
 const logger = getLogger(`${LOG4JS_BASE_CATEGORY_NAME}.federation.client.1_0.SendCoinsClient`)
 
diff --git a/core/src/federation/client/1_0/logging/SendCoinsArgsLogging.view.ts b/core/src/federation/client/1_0/logging/SendCoinsArgsLogging.view.ts
index 4057a2971..1db8c2887 100644
--- a/core/src/federation/client/1_0/logging/SendCoinsArgsLogging.view.ts
+++ b/core/src/federation/client/1_0/logging/SendCoinsArgsLogging.view.ts
@@ -1,6 +1,6 @@
 import { AbstractLoggingView } from 'database'
 
-import { SendCoinsArgs } from 'core/src/federation/client/1_0/model/SendCoinsArgs'
+import { SendCoinsArgs } from '@federation/client/1_0/model/SendCoinsArgs'
 
 export class SendCoinsArgsLoggingView extends AbstractLoggingView {
   public constructor(private self: SendCoinsArgs) {
diff --git a/core/src/federation/client/1_0/logging/SendCoinsResultLogging.view.ts b/core/src/federation/client/1_0/logging/SendCoinsResultLogging.view.ts
index a83e211e8..383f4fd37 100644
--- a/core/src/federation/client/1_0/logging/SendCoinsResultLogging.view.ts
+++ b/core/src/federation/client/1_0/logging/SendCoinsResultLogging.view.ts
@@ -1,6 +1,6 @@
 import { AbstractLoggingView } from 'database'
 
-import { SendCoinsResult } from 'core/src/federation/client/1_0/model/SendCoinsResult'
+import { SendCoinsResult } from '@federation/client/1_0/model/SendCoinsResult'
 
 export class SendCoinsResultLoggingView extends AbstractLoggingView {
   public constructor(private self: SendCoinsResult) {
diff --git a/core/src/federation/client/1_0/query/voteForSendCoins.ts b/core/src/federation/client/1_0/query/voteForSendCoins.ts
index 6fc9a11ae..9b987657c 100644
--- a/core/src/federation/client/1_0/query/voteForSendCoins.ts
+++ b/core/src/federation/client/1_0/query/voteForSendCoins.ts
@@ -5,13 +5,4 @@ export const voteForSendCoins = gql`
     voteForSendCoins(data: $args)
   }
 `
-/*
-    {
-      vote
-      recipGradidoID
-      recipFirstName
-      recipLastName
-      recipAlias
-    }
-  }
-*/
+
diff --git a/core/src/federation/client/1_1/SendCoinsClient.ts b/core/src/federation/client/1_1/SendCoinsClient.ts
index b37f08b29..8c7f9caec 100644
--- a/core/src/federation/client/1_1/SendCoinsClient.ts
+++ b/core/src/federation/client/1_1/SendCoinsClient.ts
@@ -1,3 +1,3 @@
-import { SendCoinsClient as V1_0_SendCoinsClient } from 'core/src/federation/client/1_0/SendCoinsClient'
+import { SendCoinsClient as V1_0_SendCoinsClient } from '@federation/client/1_0/SendCoinsClient'
 
 export class SendCoinsClient extends V1_0_SendCoinsClient {}
diff --git a/backend/src/logging/DecayLogging.view.ts b/core/src/graphql/logging/DecayLogging.view.ts
similarity index 92%
rename from backend/src/logging/DecayLogging.view.ts
rename to core/src/graphql/logging/DecayLogging.view.ts
index 538beecd5..f4f20ab6f 100644
--- a/backend/src/logging/DecayLogging.view.ts
+++ b/core/src/graphql/logging/DecayLogging.view.ts
@@ -1,6 +1,6 @@
 import { AbstractLoggingView } from 'database'
 
-import { Decay } from '@/graphql/model/Decay'
+import { Decay } from '@graphql/model/Decay'
 import type { Decay as DecayInterface } from 'shared'
 
 export class DecayLoggingView extends AbstractLoggingView {
diff --git a/core/src/graphql/logic/processXComSendCoins.ts b/core/src/graphql/logic/processXComSendCoins.ts
index 3b17939d5..a50fa2f8d 100644
--- a/core/src/graphql/logic/processXComSendCoins.ts
+++ b/core/src/graphql/logic/processXComSendCoins.ts
@@ -18,19 +18,105 @@ import { SendCoinsResult } from '@federation/client/1_0/model/SendCoinsResult'
 import { SendCoinsClientFactory } from '@federation/client/SendCoinsClientFactory'
 import { encryptAndSign, PendingTransactionState, SendCoinsJwtPayloadType, SendCoinsResponseJwtPayloadType, verifyAndDecrypt } from 'shared'
 import { TransactionTypeId } from '@graphql/enum/TransactionTypeId'
-import { LogError } from '@server/LogError'
+// import { LogError } from '@server/LogError'
 import { calculateSenderBalance } from '@util/calculateSenderBalance'
 import { fullName } from '@util/utilities'
 import { getLogger } from 'log4js'
 
-import { settlePendingSenderTransaction } from '@graphql/resolver/util/settlePendingSenderTransaction'
+import { settlePendingSenderTransaction } from './settlePendingSenderTransaction'
 import { SendCoinsArgsLoggingView } from '@federation/client/1_0/logging/SendCoinsArgsLogging.view'
 import { SendCoinsResultLoggingView } from '@federation/client/1_0/logging/SendCoinsResultLogging.view'
-import { EncryptedTransferArgs } from 'core'
+import { EncryptedTransferArgs } from '@graphql/model/EncryptedTransferArgs'
 import { randombytes_random } from 'sodium-native'
 
 const createLogger = (method: string) => getLogger(`${LOG4JS_BASE_CATEGORY_NAME}.graphql.resolver.util.processXComSendCoins.${method}`)
+/*
+export async function processXComTransaction(
+  receiverCom: DbCommunity,
+  senderCom: DbCommunity,
+  creationDate: Date,
+  amount: Decimal,
+  memo: string,
+  sender: dbUser,
+  recipientIdentifier: string,
+): Promise<boolean> {
+  const methodLogger = createLogger(`processXComTransaction`)
+  // processing a x-community sendCoins
+  methodLogger.info('X-Com: processing a x-community transaction...')
+  if (!CONFIG.FEDERATION_XCOM_SENDCOINS_ENABLED) {
+    throw new LogError('X-Community sendCoins disabled per configuration!')
+  }
+  const recipCom = await getCommunityByIdentifier(recipientCommunityIdentifier)
+  methodLogger.debug('recipient community: ', recipCom?.id)
+  if (recipCom === null) {
+    throw new LogError(
+      `no recipient community found for identifier: ${recipientCommunityIdentifier}`,
+    )
+  }
+  if (recipCom !== null && recipCom.authenticatedAt === null) {
+    throw new LogError('recipient community is connected, but still not authenticated yet!')
+  }
+  let pendingResult: SendCoinsResponseJwtPayloadType | null = null
+  let committingResult: SendCoinsResult
+  const creationDate = new Date()
 
+  try {
+    pendingResult = await processXComPendingSendCoins(
+      recipCom,
+      homeCom,
+      creationDate,
+      amount,
+      memo,
+      senderUser,
+      recipientIdentifier,
+    )
+    methodLogger.debug('processXComPendingSendCoins result: ', pendingResult)
+    if (pendingResult && pendingResult.vote && pendingResult.recipGradidoID) {
+      methodLogger.debug('vor processXComCommittingSendCoins... ')
+      committingResult = await processXComCommittingSendCoins(
+        recipCom,
+        homeCom,
+        creationDate,
+        amount,
+        memo,
+        senderUser,
+        pendingResult,
+      )
+      methodLogger.debug('processXComCommittingSendCoins result: ', committingResult)
+      if (!committingResult.vote) {
+        methodLogger.fatal('FATAL ERROR: on processXComCommittingSendCoins for', committingResult)
+        throw new LogError(
+          'FATAL ERROR: on processXComCommittingSendCoins with ',
+          recipientCommunityIdentifier,
+          recipientIdentifier,
+          amount.toString(),
+          memo,
+        )
+      }
+      // after successful x-com-tx store the recipient as foreign user
+      methodLogger.debug('store recipient as foreign user...')
+      if (await storeForeignUser(recipCom, committingResult)) {
+        methodLogger.info(
+          'X-Com: new foreign user inserted successfully...',
+          recipCom.communityUuid,
+          committingResult.recipGradidoID,
+        )
+      }
+    }
+  } catch (err) {
+    const errmsg = `ERROR: on processXComCommittingSendCoins with ` +
+      recipientCommunityIdentifier +
+      recipientIdentifier +
+      amount.toString() +
+      memo +
+      err
+    methodLogger.error(errmsg)
+    throw new Error(errmsg)
+  }
+  return true
+}
+*/
+/*
 export async function processXComPendingSendCoins(
   receiverCom: DbCommunity,
   senderCom: DbCommunity,
@@ -82,6 +168,149 @@ export async function processXComPendingSendCoins(
     })
     const client = SendCoinsClientFactory.getInstance(receiverFCom)
 
+    if (client instanceof V1_0_SendCoinsClient) {
+      const payload = new SendCoinsJwtPayloadType(handshakeID,
+        receiverCom.communityUuid!,
+        recipientIdentifier,
+        creationDate.toISOString(),
+        amount,
+        memo,
+        senderCom.communityUuid!,
+        sender.gradidoID,
+        fullName(sender.firstName, sender.lastName),
+        sender.alias
+      )
+      if(methodLogger.isDebugEnabled()) {
+        methodLogger.debug(`ready for voteForSendCoins with payload=${payload}`)
+      }
+      const jws = await encryptAndSign(payload, senderCom.privateJwtKey!, receiverCom.publicJwtKey!)
+      if(methodLogger.isDebugEnabled()) {
+        methodLogger.debug('jws', jws)
+      }
+      // prepare the args for the client invocation
+      const args = new EncryptedTransferArgs()
+      args.publicKey = senderCom.publicKey.toString('hex')
+      args.jwt = jws
+      args.handshakeID = handshakeID
+      if(methodLogger.isDebugEnabled()) {
+        methodLogger.debug('before client.voteForSendCoins() args:', args)
+      }
+
+      const responseJwt = await client.voteForSendCoins(args)
+      if(methodLogger.isDebugEnabled()) {
+        methodLogger.debug(`response of voteForSendCoins():`, responseJwt)
+      }
+      if (responseJwt !== null) {
+        voteResult = await verifyAndDecrypt(handshakeID, responseJwt, senderCom.privateJwtKey!, receiverCom.publicJwtKey!) as SendCoinsResponseJwtPayloadType
+        if(methodLogger.isDebugEnabled()) {
+          methodLogger.debug(`calculated voteResult = ${JSON.stringify(voteResult, null, 2)}`)
+        }
+        if (voteResult && voteResult.vote && voteResult.recipGradidoID) {
+          methodLogger.debug('vor processXComCommittingSendCoins... ')
+          const committingResult = await processXComCommittingSendCoins(
+            receiverCom,
+            senderCom,
+            creationDate,
+            amount,
+            memo,
+            sender,
+            voteResult,
+          )
+          methodLogger.debug('processXComCommittingSendCoins result: ', committingResult)
+          if (!committingResult.vote) {
+            methodLogger.fatal('FATAL ERROR: on processXComCommittingSendCoins for', committingResult)
+            throw new LogError(
+              'FATAL ERROR: on processXComCommittingSendCoins with ',
+              recipientCommunityIdentifier,
+              recipientIdentifier,
+              amount.toString(),
+              memo,
+            )
+          }
+          // after successful x-com-tx store the recipient as foreign user
+          methodLogger.debug('store recipient as foreign user...')
+          if (await storeForeignUser(receiverCom, committingResult)) {
+            methodLogger.info(
+              'X-Com: new foreign user inserted successfully...',
+              receiverCom.communityUuid,
+              committingResult.recipGradidoID,
+            )
+          }
+        }
+      }
+    } else {
+      const errmsg = `Client is not instance of V1_0_SendCoinsClient`
+      methodLogger.error(errmsg)
+      throw new LogError(errmsg)
+    }
+  } catch (err) {
+    const errmsg = `ERROR: on processXComCommittingSendCoins with ` +
+      recipientCommunityIdentifier +
+      recipientIdentifier +
+      amount.toString() +
+      memo +
+      err
+    throw new LogError(errmsg)
+  }
+}
+        memo,
+        err,
+      )
+    }
+  }
+}
+*/
+export async function processXComPendingSendCoins(
+  receiverCom: DbCommunity,
+  senderCom: DbCommunity,
+  creationDate: Date,
+  amount: Decimal,
+  memo: string,
+  sender: dbUser,
+  recipientIdentifier: string,
+): Promise<SendCoinsResponseJwtPayloadType | null> {
+  let voteResult: SendCoinsResponseJwtPayloadType
+  const methodLogger = createLogger(`processXComPendingSendCoins`)
+  try {
+    // even if debug is not enabled, attributes are processed so we skip the entire call for performance reasons
+    if(methodLogger.isDebugEnabled()) {
+      methodLogger.debug(
+        'XCom: processXComPendingSendCoins...', {
+          receiverCom: new CommunityLoggingView(receiverCom),
+          senderCom: new CommunityLoggingView(senderCom),
+          amount: amount.toString(),
+          memo: memo.substring(0, 5),
+          sender: new UserLoggingView(sender),
+          recipientIdentifier
+        }
+      )
+    }
+    if (await countOpenPendingTransactions([sender.gradidoID, recipientIdentifier]) > 0) {
+      const errmsg = `There exist still ongoing 'Pending-Transactions' for the involved users on sender-side!`
+      methodLogger.error(errmsg)
+      throw new Error(errmsg)
+    }
+    const handshakeID = randombytes_random().toString()
+    methodLogger.addContext('handshakeID', handshakeID)
+    // first calculate the sender balance and check if the transaction is allowed
+    const senderBalance = await calculateSenderBalance(sender.id, amount.mul(-1), creationDate)
+    if (!senderBalance) {
+      const errmsg = `User has not enough GDD or amount is < 0`
+      methodLogger.error(errmsg)
+      throw new Error(errmsg)
+    }
+    if(methodLogger.isDebugEnabled()) {
+      methodLogger.debug(`calculated senderBalance = ${JSON.stringify(senderBalance, null, 2)}`)
+    }
+
+    const receiverFCom = await DbFederatedCommunity.findOneOrFail({
+      where: {
+        publicKey: Buffer.from(receiverCom.publicKey),
+        apiVersion: CONFIG.FEDERATION_BACKEND_SEND_ON_API,
+      },
+    })
+    const client = SendCoinsClientFactory.getInstance(receiverFCom)
+
     if (client instanceof V1_0_SendCoinsClient) {
       const payload = new SendCoinsJwtPayloadType(handshakeID,
         receiverCom.communityUuid!,
diff --git a/backend/src/graphql/resolver/util/settlePendingSenderTransaction.ts b/core/src/graphql/logic/settlePendingSenderTransaction.ts
similarity index 85%
rename from backend/src/graphql/resolver/util/settlePendingSenderTransaction.ts
rename to core/src/graphql/logic/settlePendingSenderTransaction.ts
index c528b0ca7..8abd511c1 100644
--- a/backend/src/graphql/resolver/util/settlePendingSenderTransaction.ts
+++ b/core/src/graphql/logic/settlePendingSenderTransaction.ts
@@ -10,17 +10,16 @@ import {
 } from 'database'
 import { Decimal } from 'decimal.js-light'
 
-import { PendingTransactionState } from 'shared'
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
-import { LogError } from '@/server/LogError'
-import { TRANSACTIONS_LOCK } from '@/util/TRANSACTIONS_LOCK'
-import { calculateSenderBalance } from '@/util/calculateSenderBalance'
+import { PendingTransactionState } from 'shared'
+// import { LogError } from '@/server/LogError'
+import { calculateSenderBalance } from 'core'
+import { TRANSACTIONS_LOCK, getLastTransaction } from 'database'
 import { getLogger } from 'log4js'
-import { getLastTransaction } from './getLastTransaction'
 
 const db = AppDatabase.getInstance()
 const logger = getLogger(
-  `${LOG4JS_BASE_CATEGORY_NAME}.graphql.resolver.util.settlePendingSenderTransaction`,
+  `${LOG4JS_BASE_CATEGORY_NAME}.graphql.logic.settlePendingSenderTransaction`,
 )
 
 export async function settlePendingSenderTransaction(
@@ -53,15 +52,17 @@ export async function settlePendingSenderTransaction(
       ],
     })
     if (openSenderPendingTx > 1 || openReceiverPendingTx > 1) {
-      throw new LogError('There are more than 1 pending Transactions for Sender and/or Recipient')
+      const errmsg = `There are more than 1 pending Transactions for Sender and/or Recipient`
+      logger.error(errmsg)
+      throw new Error(errmsg)
     }
 
     const lastTransaction = await getLastTransaction(senderUser.id)
 
     if (lastTransaction?.id !== pendingTx.previous) {
-      throw new LogError(
-        `X-Com: missmatching transaction order! lastTransationId=${lastTransaction?.id} != pendingTx.previous=${pendingTx.previous}`,
-      )
+      const errmsg = `X-Com: missmatching transaction order! lastTransationId=${lastTransaction?.id} != pendingTx.previous=${pendingTx.previous}`
+      logger.error(errmsg)
+      throw new Error(errmsg)
     }
 
     // transfer the pendingTx to the transactions table
@@ -82,7 +83,9 @@ export async function settlePendingSenderTransaction(
       pendingTx.balanceDate,
     )
     if (!sendBalance) {
-      throw new LogError(`Sender has not enough GDD or amount is < 0', sendBalance`)
+      const errmsg = 'Sender has not enough GDD or amount is < 0'
+      logger.error(errmsg)
+      throw new Error(errmsg)
     }
     transactionSend.balance = sendBalance?.balance ?? new Decimal(0)
     transactionSend.balanceDate = pendingTx.balanceDate
@@ -114,7 +117,8 @@ export async function settlePendingSenderTransaction(
     // void sendTransactionsToDltConnector()
   } catch (e) {
     await queryRunner.rollbackTransaction()
-    throw new LogError('X-Com: send Transaction was not successful', e)
+    logger.error('X-Com: send Transaction was not successful', e)
+    throw new Error('X-Com: send Transaction was not successful')
   } finally {
     await queryRunner.release()
     releaseLock()
diff --git a/backend/src/graphql/model/Decay.ts b/core/src/graphql/model/Decay.ts
similarity index 100%
rename from backend/src/graphql/model/Decay.ts
rename to core/src/graphql/model/Decay.ts
diff --git a/core/src/index.ts b/core/src/index.ts
index 3aa4a63d8..9ee34cc19 100644
--- a/core/src/index.ts
+++ b/core/src/index.ts
@@ -1,3 +1,4 @@
+export {SendCoinsClient as V1_0_SendCoinsClient} from './federation/client/1_0/SendCoinsClient'
 export * from './federation/client/1_0/logging/SendCoinsArgsLogging.view'
 export * from './federation/client/1_0/logging/SendCoinsResultLogging.view'
 export * from './federation/client/1_0/model/SendCoinsArgs'
@@ -6,12 +7,16 @@ export * from './federation/client/1_0/query/revertSendCoins'
 export * from './federation/client/1_0/query/revertSettledSendCoins'
 export * from './federation/client/1_0/query/settleSendCoins'
 export * from './federation/client/1_0/query/voteForSendCoins'
+export {SendCoinsClient as V1_1_SendCoinsClient} from './federation/client/1_1/SendCoinsClient'
 export * from './federation/client/SendCoinsClientFactory'
 export * from './federation/enum/apiVersionType'
 export * from './graphql/enum/TransactionTypeId'
+export * from './graphql/logging/DecayLogging.view'
 export * from './graphql/logic/interpretEncryptedTransferArgs'
 export * from './graphql/logic/processXComSendCoins'
+export * from './graphql/model/Decay'
 export * from './graphql/model/EncryptedTransferArgs'
+export * from './util/calculateSenderBalance'
 export * from './util/utilities'
 export * from './validation/user'
 
diff --git a/backend/src/util/calculateSenderBalance.ts b/core/src/util/calculateSenderBalance.ts
similarity index 83%
rename from backend/src/util/calculateSenderBalance.ts
rename to core/src/util/calculateSenderBalance.ts
index a01b1f15e..ce7609895 100644
--- a/backend/src/util/calculateSenderBalance.ts
+++ b/core/src/util/calculateSenderBalance.ts
@@ -1,8 +1,8 @@
 import { Decimal } from 'decimal.js-light'
 
-import { Decay } from '@model/Decay'
+import { Decay } from '@graphql/model/Decay'
 
-import { getLastTransaction } from '@/graphql/resolver/util/getLastTransaction'
+import { getLastTransaction } from 'database'
 
 import { calculateDecay } from 'shared'
 
diff --git a/database/package.json b/database/package.json
index 6a6240fa1..26aa6b9e1 100644
--- a/database/package.json
+++ b/database/package.json
@@ -41,6 +41,7 @@
     "@types/geojson": "^7946.0.13",
     "@types/jest": "27.0.2",
     "@types/node": "^18.7.14",
+    "await-semaphore": "^0.1.3",
     "crypto-random-bigint": "^2.1.1",
     "jest": "27.2.4",
     "ts-jest": "27.0.5",
diff --git a/database/src/index.ts b/database/src/index.ts
index 3ff4efa17..56dec24ee 100644
--- a/database/src/index.ts
+++ b/database/src/index.ts
@@ -60,4 +60,5 @@ export const entities = [
 export { latestDbVersion }
 export * from './logging'
 export * from './queries'
+export * from './util'
 export { AppDatabase } from './AppDatabase'
diff --git a/database/src/queries/index.ts b/database/src/queries/index.ts
index 9acf80871..b8ca12b86 100644
--- a/database/src/queries/index.ts
+++ b/database/src/queries/index.ts
@@ -3,5 +3,6 @@ import { LOG4JS_BASE_CATEGORY_NAME } from '../config/const'
 export * from './user'
 export * from './communities'
 export * from './pendingTransactions'
+export * from './transactions'
 
 export const LOG4JS_QUERIES_CATEGORY_NAME = `${LOG4JS_BASE_CATEGORY_NAME}.queries`
diff --git a/backend/src/graphql/resolver/util/getLastTransaction.ts b/database/src/queries/transactions.ts
similarity index 100%
rename from backend/src/graphql/resolver/util/getLastTransaction.ts
rename to database/src/queries/transactions.ts
diff --git a/backend/src/util/TRANSACTIONS_LOCK.ts b/database/src/util/TRANSACTIONS_LOCK.ts
similarity index 100%
rename from backend/src/util/TRANSACTIONS_LOCK.ts
rename to database/src/util/TRANSACTIONS_LOCK.ts
diff --git a/backend/src/util/TRANSACTION_LINK_LOCK.ts b/database/src/util/TRANSACTION_LINK_LOCK.ts
similarity index 100%
rename from backend/src/util/TRANSACTION_LINK_LOCK.ts
rename to database/src/util/TRANSACTION_LINK_LOCK.ts
diff --git a/database/src/util/index.ts b/database/src/util/index.ts
new file mode 100644
index 000000000..b16b20d19
--- /dev/null
+++ b/database/src/util/index.ts
@@ -0,0 +1,2 @@
+export * from './TRANSACTIONS_LOCK'
+export * from './TRANSACTION_LINK_LOCK'
\ No newline at end of file
diff --git a/federation/src/client/1_0/AuthenticationClient.ts b/federation/src/client/1_0/AuthenticationClient.ts
index 60a205aa7..ac14bcb84 100644
--- a/federation/src/client/1_0/AuthenticationClient.ts
+++ b/federation/src/client/1_0/AuthenticationClient.ts
@@ -3,7 +3,7 @@ import { GraphQLClient } from 'graphql-request'
 import { getLogger, Logger } from 'log4js'
 import { LOG4JS_BASE_CATEGORY_NAME } from '@/config/const'
 
-import { EncryptedTransferArgs } from 'core/src/graphql/model/EncryptedTransferArgs'
+import { EncryptedTransferArgs } from 'core'
 import { authenticate } from './query/authenticate'
 import { openConnectionCallback } from './query/openConnectionCallback'