Looks like a scamp to me.
I got the same txt msg and my wife got one at 1:00 AM
I did a quick domain name look up and it is a protected name
(hiden ownership) that was just registered last week. I would be very suprised if Chase would roll out something that quickly with out a lot testing on the web....just cause they have too much corporate red tape!
Found this on the web site the text listed:
For SMS text messages, you may remove your information by replying "STOP", "END", or "QUIT" to the SMS text message you have received and we will remove your personal information within 10 days of receiving such request.
Received a text message from this number saying this - Your entry last month has WON! Go to http://bestbuywinners.mobi/ and enter code 4757 to claim your FREE $1000 Best Buy Gift Card now! - It is obviously a hoax. Just sounds like one and I never entered in anything like that. Be careful!