Yes indeed, our first 200 BTC bet.  That's over $20,000 on a single dice roll, on a site that's been up for 3 days.

More generally, I was keeping a list of milestone bets:

https://just-dice.com/milestones.txt

First bet over 10 BTC:
  https://just-dice.com/roll/10544

First bet over 30 BTC:
  https://just-dice.com/roll/13364

First bet to lose 10 BTC:
  https://just-dice.com/roll/13561

First bet over 50 BTC:
  https://just-dice.com/roll/14297

First 990,000x winner (hit 00.0000%):
  https://just-dice.com/roll/708311

First crazy 50% martingale sequence:
  https://just-dice.com/roll/1188508:  1 BTC at 50% hi: lucky:348585 profit: -1
  https://just-dice.com/roll/1188539:  2 BTC at 50% hi: lucky:390462 profit: -2
  https://just-dice.com/roll/1188563:  4 BTC at 50% hi: lucky:437957 profit: -4
  https://just-dice.com/roll/1188586:  8 BTC at 50% hi: lucky:254866 profit: -8
  https://just-dice.com/roll/1188610: 16 BTC at 50% hi: lucky: 71538 profit:-16
  https://just-dice.com/roll/1188664: 25 BTC at 50% hi: lucky:503020 profit: 24.5

Second 990,000x winner (hit 99.9999%):
  https://just-dice.com/roll/1565360

First bet of 200 BTC!
  https://just-dice.com/roll/1612582