it's been confirmed vs it has been confirmed

Some examples from the web:

• It's been confirmed by our embassy in Moscow.
• 'It's been confirmed that Susannah, Duchess of Beaumont
• It's been confirmed that Dale is safe and uninjured.
• It's been confirmed that US forces are being sent to the area.
• It's been confirmed that the disease is accelerating in Pretty Lake as the death toll mounts to over 300.
• In the last two minutes 'It's been confirmed that Susannah, Duchess of Beaumont 'has been kidnapped.
• Apparently so, Mr. President. It's been confirmed by JPL. But to be honest... you're looking at the two brightest people in the field.
• It's been confirmed that it's the unintentional side effect of the Russians striking one of their own satellites.
• It's been confirmed that during what had been a negotiated cease-fire during the new year holiday of Tet, the Viet Cong have attacked the American Embassy in Vietnam, along with reports of attacks in five provincial South Vietnamese capitals.
• I mean, it's been confirmed.
• Yes, sir, it's been confirmed.
• So, it's been confirmed?
• Boss, it's been confirmed.
• It's been confirmed by JPL.
• It's been confirmed that two gang member assassins were arrested while staking out judges' homes, while a third was killed in a shootout with authorities.
• Like we didn't know it's been confirmed.
• But it's been confirmed - Mr Roberts died of acute peritonitis as a result of undiagnosed typhoid infection.
• It's been confirmed that Wonil Jang voluntarily went to the North...
• He was Jesper's best man. It's been confirmed that they're close friends.
• It's been confirmed to us that a U. S. Combat aircraft...

Some examples from the web:

• Contrary to this claim, it has been confirmed that the Community industry supplies barium carbonate to at least one importer producing slurry out of it.
• Also recently it has been confirmed that this plasticity tends to reduce to nearly zero after 15 years of age.
• Yes. You may modify your booking once it has been confirmed.
• Cancellation and amendment charges are payable if a booking or other purchase is cancelled or amended after it has been confirmed.
• Finally, it has been confirmed that, although mandatory by law, the involvement of chartered accountants in the verification process is, in practice, not guaranteed.
• In this respect, it has been confirmed that according to statistical data the vast majority of imports from the PRC were those of the sole cooperating exporting producer.
• During investigations it has been confirmed that the legal basis for the fraud charge was EU Regulation (EC) No 2064/97, which was introduced after the grant was drawn down but backdated to 1994.
• Concerning the events of 3 February 2011 in Ramallah, it has been confirmed through meetings between EUPOL COPPS and the PCP that several security agencies were present during the demonstration and that some level of violence was used.
• The meeting lasted approximately two hours, and during the session it has been confirmed that the ne Prime Minister will be leader of the Socialist party Ivica Dacic, while other personnel solutions have not been discussed.
• In particular, it has been confirmed that the influence of the State-owned shareholder on the decision making process of the company was disproportionately high and that the State agreed to reduce the established value of the land use rights by 50 % without any compensation.
• For the upcoming 2010 season the Interwetten will go further into another motorsport and it has been confirmed that Interwetten will start sponsoring the Honda Team in the MotoGP series as well as keep the Formula team.
• However once once more, this kind of a relationship is based on shallow and hole premises. And, as it has been confirmed time and again, the very thing the girl was drawn to will quickly turn out to be the thing she despises the most.
• While it has been confirmed that the number of employees of battery producers is much larger than that of the Community industry, no evidence has been submitted that the imposition of duties would result in loss of employment.
• As for the incentive effect of the aid, it has been confirmed that the beneficiary applied for the licence entitling it to the aid and the licence was granted before the start of work on the project.
• It has been confirmed that Jake Mendez is a military criminal.
• It has been confirmed that the earlier strict anti-epidemic measures of the European Union had been correct.
• It has been confirmed, it is the H5N1 virus.
• 'It has been confirmed that a non-aggression pact 'between Germany and the Soviet Union 'will be finalised before midnight tonight.
• It has been confirmed that the body thrown from the entrance was indeed Harlem's own, Damon Boone.
• It has been confirmed at different levels that until this has happened, there will be no business as usual.