Quote from: seoincorporation on Today at 06:26:47 PM

Quote from: a8832021 on Today at 01:27:52 PM

If the pubkey is revealed,may someone use BSGS algorithm to crack the privkey and double spend the coins? Huh

YES, there is a bunch of tools to do that some people running crazy crazy machines
the pubkey is not revealed yet and because of the small range 2^66..

you can try this buy yourself pick a random prvtkey 0x2AAA5555000FFFFFF run kangaroo and see!

The public key is already known information, but that is not enough to crack the private key, and if someone get's access to the private key first they need to spend the coins before be able to double spend it. But looks like you are lost in the topic, what op means is.

Let's say someone finds the private key from puzzles 66 and 67, if they spend the coins and make public the private key, som users could use that private key to make a double spend from the same coins and if they use bigger fees then they could steal those coins. But the way to avoid that is to not make public the private key until it has more than 1 confirmation.

you got me wrong, the address has no Outputs tx yet

#66 — Unsolved
×
Key range
(265)...(266)
Reward
6.6005673 BTC
Decimal start point
36893488147419103232 = (265)
Decimal end point
73786976294838206463 = (266)
HEX start point
20000000000000000
HEX end point
3ffffffffffffffff
Total keys
36893488147419103232
Target
13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so