Hash 32 or 33 bytes?

1

I am trying decode the ipfs file hash (base58 of sha256) to UTF8 binary. I need transform back into 32 bytes.

I am using this js Code


https://incoherency.co.uk/base58/

I remove the first 2 bytes from hash (Qm) and try to decode the rest. But it returns me 33 bytes!!!
You can check also as hex

2

You need to decode the base58 first. The decoded bytes don’t map one-to-one to the characters in encoded string.

Note: Don’t rely on the “hash” having this format. CIDv1 (the next-gen CID format):

  1. Allows arbitrary (safe) hash functions).
  2. Has a slightly different format.
3

Solved.
I decoded the base58 to hex first. So I ignored the first 2 bytes (Qm) in hex .

If ignore the 2 bytes before and decode to hex after, will not works when encode to base58 again.