The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "bitcoin" appeared
2019-05-29 : Back to stable2018-05-14 : Virtual currencies ante portas
2018-03-14 : Interview with Luxemburger Wort
2018-02-15 : Rencontres du Club SEPA
2018-02-08 : Virtual or virtueless? The evolution of money in the digital age
2017-12-29 : Interview with Börsen-Zeitung
2014-05-19 : Euro banknotes - a means of payment recognised worldwide