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Self describing hashes - for future proofing

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[Your homepage](https://multiformats.io/multihash/#sha2-512-256-bits) implies in its examples that "SHA-512 (256 bit)" is the truncated version of SHA-512, and that's pretty clear in the `0x1320` header, but since there are a few...

Scrypt and Qubit are most common in cryptocurrency. I suggest we should support these.

enhancement

I just noticed that the [java](https://github.com/multiformats/java-multihash/blob/master/src/main/java/io/ipfs/multihash/Multihash.java#L1) implementation has the namespace `io.ipfs.multihash` and the [kotlin](https://github.com/changjiashuai/kotlin-multihash/blob/master/src/main/kotlin/io/ipfs/multiformats/multihash/Multihash.kt#L1) implementation has `io.ipfs.multiformats.multihash`. Ideally, all jvm multiformats implementations would live in peace and harmony and fall...

https://github.com/multiformats/multihash/blob/master/hashtable.csv says: blake2s-256 0xb260 blake2b-256 0xb220 blake2s-256 and blake2b-256 for the same input generate different hashcodes of the same size but have the same fncode 0xb2 and different digsize than...

**bcrypt** is currently one of the best options for storing passwords. [Coda Hale](https://codahale.com/how-to-safely-store-a-password/) explains it better than I could.

The current SwiftMultihash implementation looks to be out of date (e.g. no varint encoding). It also doesn't seem to use the Swift Package Manager. I actually had started writing my...

Just wondering if the devs here have seen the work at the IETF: https://tools.ietf.org/html/rfc6920 Could the two efforts be compatible?