diff --git a/app/modules/prover/lib/powCluster.ts b/app/modules/prover/lib/powCluster.ts
index 4994cfc17e300058056a21d012bb0c8fcdfa1bf2..bfc7537d584c6c09991449efb9b646da5b04be6a 100644
--- a/app/modules/prover/lib/powCluster.ts
+++ b/app/modules/prover/lib/powCluster.ts
@@ -54,7 +54,7 @@ export class Master {
       // Stop the slaves' current work
       this.cancelWork()
     }
-    this.logger.warn(`ENGINE c#${this.clusterId}#${this.slavesMap[worker.id].index}:`, message)
+    // this.logger.debug(`ENGINE c#${this.clusterId}#${this.slavesMap[worker.id].index}:`, message)
   }
 
   initCluster() {
@@ -175,9 +175,7 @@ export class Master {
     this.currentPromise = this.newPromise(uuid)
 
     return (async () => {
-      this.logger.info(`Waiting workers to be all online...`)
       await Promise.all(this.workersOnline)
-      this.logger.info(`All online!`)
 
       if (!this.currentPromise) {
         this.logger.info(`Proof canceled during workers' initialization`)
@@ -185,9 +183,7 @@ export class Master {
       }
 
       // Start the salves' job
-      this.logger.info(`Sending newPow signal for each of %s workers...`, this.slaves.length)
       this.slaves.forEach((s:any, index) => {
-        this.logger.info(`Sending signal for worker #%s`, index)
         s.worker.send({
           uuid,
           command: 'newPoW',
diff --git a/app/modules/prover/lib/proof.ts b/app/modules/prover/lib/proof.ts
index 2f43297a0a5173932f3bbd12fc37fa00c4f89886..e569f5a362c205887a964541ff9016e749aa14b7 100644
--- a/app/modules/prover/lib/proof.ts
+++ b/app/modules/prover/lib/proof.ts
@@ -34,7 +34,6 @@ process.on('uncaughtException', (err:any) => {
 
 process.on('message', async (message) => {
 
-  console.log('proof => command:', message.command)
   switch (message.command) {
 
     case 'newPoW':
@@ -42,15 +41,11 @@ process.on('message', async (message) => {
         askedStop = true
 
         // Very important: do not await if the computation is already done, to keep the lock on JS engine
-        console.log('computing.isFulfilled ?', computing.isFulfilled())
         if (!computing.isFulfilled()) {
           await computing;
         }
 
-        console.log('beginNewProofOfWork()...')
-
         const res = await beginNewProofOfWork(message.value);
-        console.log('proof.res!')
         answer(message, res);
       })()
       break;
diff --git a/test/integration/membership_chainability.ts b/test/integration/membership_chainability.ts
index b49ed7ddb4d0106c3ca719329d63f5489f43ce9e..e6eb0d7b49433119caa90433e68d1b111c2dcb93 100644
--- a/test/integration/membership_chainability.ts
+++ b/test/integration/membership_chainability.ts
@@ -1,5 +1,4 @@
 const toolbox = require('./tools/toolbox')
-const logger = require('../../app/lib/logger').NewLogger()
 
 describe("Membership chainability", function() {
 
@@ -19,20 +18,14 @@ describe("Membership chainability", function() {
     }
 
     before(async () => {
-      require('../../app/lib/logger').NewLogger().unmute()
-      logger.warn('Before() ...')
       const res1 = await toolbox.simpleNodeWith2Users(conf)
-      logger.warn('res1 = OK')
       s1 = res1.s1
       cat = res1.cat
       await s1.commit({ time: now })
-      logger.warn('commit1 = OK')
       await s1.commit({ time: now })
-      logger.warn('commit2 = OK')
       await s1.commit({ time: now, actives: [
         'HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd:rppB5NEwmdMUCxw3N/QPMk+V1h2Jpn0yxTzdO2xxcNN3MACv6x8vNTChWwM6DOq+kXiQHTczFzoux+82WkMfDQ==:1-12D7B9BEBE941F6929A4A61CDC06DEEEFCB00FD1DA72E42FFF7B19A338D421E1:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:cat'
       ]})
-      logger.warn('commit3 = OK')
     })
 
     it('current should be the 2nd', () => s1.expect('/blockchain/current', (res:any) => {
@@ -61,18 +54,11 @@ describe("Membership chainability", function() {
     }
 
     before(async () => {
-      require('../../app/lib/logger').NewLogger().unmute()
-      logger.warn('before2')
       const res1 = await toolbox.simpleNodeWith2Users(conf)
-      logger.warn('res2 = OK')
       s1 = res1.s1
-      logger.warn('res2 = OK1')
       cat = res1.cat
-      logger.warn('res2 = OK2')
       await s1.commit({ time: now })
-      logger.warn('commit2.0 = OK')
       await s1.commit({ time: now + 20 })
-      logger.warn('commit2.1 = OK')
     })
 
     it('should refuse a block with a too early membership in it', async () => {