How Is a Merkle Proof Generated from the Tree?

A Merkle Proof is generated by collecting the necessary "sibling" hashes at each level of the tree, from the transaction leaf up to the Merkle Root. These sibling hashes are the ones needed to be concatenated and re-hashed with the transaction's path hash to eventually match the Merkle Root.

The proof is a small list of hashes that validates the path.

How Is the Merkle Tree Structure Used to Verify Transactions Efficiently?
Why Is the Merkle Root Essential for Simplified Payment Verification (SPV)?
What Is a ‘Light Client’ and How Does It Utilize the Merkle Root?
What Is the Difference between the Merkle Root and the Block Hash?
What Is a Merkle Tree and How Does It Use Hashing to Verify Transactions?
How Does a Merkle Proof Verify a Transaction without Revealing All Data?
How Is a Merkle Proof Used to Verify a Transaction without Downloading the Entire Blockchain?
How Does a Merkle Tree Enable Simplified Payment Verification (SPV)?

Glossar