RIPEMD was used because it produces the shortest hashes whose uniqueness is still sufficiently assured. This allows Bitcoin addresses to be shorter. SHA256 is used as well because Bitcoin's use of a hash of a public key might create unique weaknesses due to unexpected interactions between RIPEMD and ECDSA (the public key signature algorithm).

RIPEMD-160 has a 160-bit or 20-byte hash value while SHA-256 has a 256-bit or 32-byte. So RIPEMD-160 is used for it's shorter hash. However, SHA-1 also produces a 160-bit hash. RIPEMD-160 is a less popular algorithm but in fact achieves exactly the same as SHA-1 does.

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Aug 20, 2021 · Why was the RIPEMD-160 hash algorithms chosen before SHA-1? 1 Can a brainwallet passphrase be derived if an attacker has obtained the private keys of an empty wallet.dat file?

Apr 26, 2018 · But an additional RIPEMD does protect against possible weakness in SHA256 since addresses are hashed with SHA256 and RIPEMD160. – Jonas Schnelli Commented Apr 27, 2018 at 20:10

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Feb 10, 2019 · This is in form hash160, which is RIPEMD-160 (SHA-256 (Public Key)). Step 1: Break RIPEMD-160 to get the SHA-256 hash. Step 2: Break SHA-256 to get the public key. (You could also get this public key once it's published when that key is used to spend. Of course, at that point it may not help you.)

My understanding is that Base58Checked is always 34 bytes long, and isn't going to be less than 34 bytes even if the first or last bytes of the RipeMD are zero. If this statement isn't true, then none of the following question matters. Short question. What should the Base58Checked address be for the following public key?

Jun 19, 2020 · What you'd be converting to a large integer is the HASH160 of the Public Key; aka, the result of taking the public key in compressed format (33 bytes) and running it through SHA256 then running that hash through RIPEMD-160. More …

Jul 27, 2018 · run RIPEMD-160 on the key This compresses address size to 160bits and is knows as "double hashing" (HASH160). This gives us the public key hash. add a version byte in front of RIPEMD-160 hash and specify our network; Run a Base58check encode to obtain cheksum. Run SHA-256 on RIPEMD-160 twice