Where is the merkle tree of certificate hashes stored?

Technical
1

Hi,
In cert-issuer intro https://github.com/blockchain-certificates/cert-issuer, there is a description The root of the Merkle tree, which is a 256-bit hash, is issued on the Bitcoin blockchain.

My questions are:
1 how to get the entire info of Merkle tree during verification? Will the entire Merkel tree be stored in each final certerficate?
2 what the difference between bitcoin and etherum on the storage of merkle tree for a batch of certificate hashes?

Thanks for your help!

2

Afaik:

  1. the entire tree isn’t stored anywhere. Each cert keeps the needed parts to build its own “proof” of this tree.
  2. None