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tinyvanityeth's Issues

Pow overflowed error

I had this running for about 3 hours

tinyvanityeth -s 000000000 -i 3600

then this occured

Status (24 threads)
  Difficulty:  68719476736
  Generated:   3794821063 addresses
  Speed:       341675 addr/s
  Probability: 5.372%
thread '<unnamed>' panicked at 'Pow overflowed', 
C:\Users\unknown\.cargo\registry\src\github.com-1ecc6299db9ec823\rust_decimal-1.29.0\src\maths.rs:283:21
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

and this

$ tinyvanityeth -s 000000000 -t 8 -i 300
Status (8 threads)
  Difficulty:  68719476736
  Generated:   60583819 addresses
  Speed:       201946 addr/s
  Probability: 0.088%
...
...
Status (8 threads)
  Difficulty:  68719476736
  Generated:   4224656512 addresses
  Speed:       167274 addr/s
  Probability: 5.963%
thread '<unnamed>' panicked at 'Pow overflowed', 
C:\Users\unknown\.cargo\registry\src\github.com-1ecc6299db9ec823\rust_decimal-1.29.0\src\maths.rs:283:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I'm using

$ rustc --version
rustc 1.68.1 (8460ca823 2023-03-20)

Specs:

Windows 10 Pro
21H2
19044.2728
AMD Ryzen 9 3900X 12-Core Processor 3.80 GHz

P.S.
seems like
// 1 - (1 - 1 /difficulty)^generated
if generated > u32 it causes Pow overflowed problem

tinyvanityeth/src/main.rs

Lines 204 to 209 in 450f52e

/// Calculates the probability of finding an address by specifying the `difficulty` of finding
/// an address with the given prefix and the total number of addresses `generated` so far.
fn calc_probability(difficulty: u128, generated: u128) -> Decimal {
Decimal::ONE
- (Decimal::ONE - Decimal::ONE / Decimal::from(difficulty)).powd(Decimal::from(generated))
}

How is probability calculated?

Please share more details on "Probability". Is the script calculating this based on how many addresses it already checked?

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