Transaction

56cb5e2ad7a2c4e6e8276d15b219723b2218d32051db10375f1de5b7e8d7700a
Timestamp (utc)
2024-03-24 12:24:34
Fee Paid
0.00000020 BSV
(
0.01362025 BSV
-
0.01362005 BSV
)
Fee Rate
10.07 sat/KB
Version
1
Confirmations
101,344
Size Stats
1,986 B

2 Outputs

Total Output:
0.01362005 BSV
  • j"1LAnZuoQdcKCkpDBKQMCgziGMoPC4VQUckMÅ<div class="post"><div class="quoteheader">Quote</div><div class="quote">Here is a paper that claims to find SHA-1 collisions in 2^52 crypto operations. And optimally secure hash would take 2^80 operations. 2^52 time is still large, but it is getting into cluster and botnet range.<br/></div>2^80 is if you can use a birthday attack. &nbsp;You can't use a birthday attack for this, so the difficulty is the full 2^160 bits.&nbsp; Although, if you were trying to crack any one of 1 million (2^20) transactions, you could do a partial birthday attack 2^160/2^20 = 2^140.<br/><br/>Bitcoin Addresses are the only place where 160-bit hash is used. &nbsp;Everything else is SHA-256. &nbsp;They're calculated as:<br/><br/>bitcoinaddress = RIPEMD-160(SHA-256(publickey))<br/><br/>Correct me if I'm wrong (please, and I'll gladly eat crow) but I think it would be hard to use an analytical attack on RIPEMD-160 in this case. &nbsp;An analytical attack prescribes a certain range or pattern of inputs to try that will greatly increase your chance of finding a collision. &nbsp;Here, you don't have that kind of control over RIPEMD-160's input, because the input is the output of SHA-256. &nbsp;If an analytical attack helps you find an input to RIPEMD-160 that produces a collision, what are you going to do with it? &nbsp;You still have to get SHA-256 to output that value, so you would still have to break SHA-256 too.<br/><br/>For brute force, RIPEMD-160(SHA-256(x)) is no stronger than RIPEMD-160 alone. &nbsp;But for analytical attack, it seems like you must analytical attack both RIPEMD-160 and SHA-256. &nbsp;If I'm wrong, then the strength is the same as RIPEMD-160 and the SHA-256 only serves as one round of key strengthening.</div> text/html
    https://whatsonchain.com/tx/56cb5e2ad7a2c4e6e8276d15b219723b2218d32051db10375f1de5b7e8d7700a