I'm trying to figure out the check of existence and the immutability of the transaction in the Ethereum block, but I do not know how to get mercle branch. With the help of web3j I can get the block number by the hash of the transaction, and then get the full list of transactions by the block number. But there must be a way to get only those transactions that are needed for verification - merkle proof. How can I get only needed hashes? I will be glad to any help!
The Patricia trie used in Ethereum is different from a Merkle tree, so the Merkle proof is different as well.
In a Patricia trie Merkle proof, you need to know the key being accessed and a full list of nodes accessed to get to the value.
