@abcoathup I’m trying to use verify() from MerkleProof.sol but it’s not working. :computer: Environment Truffle v5.1.26 (core: 5.1.26) Solidity - 0.6.8 (solc-js) Node v13.13.0 Web3.js v1.2.1 Ubuntu 18.04 :memo:Details When trying to test the following function (claim()) via truffle test i…

@abcoathup Buffer error with keccak256 related to abi.encodePacked opened 04:43PM - 26 May 20 UTC (UTC) closed 09:10PM - 26 May 20 UTC (UTC) [naszam] naszam …

The issue is probably related to render abi.encodePacked on the front-end via ethers.utils.solidityPack or similar. Any Idea on how to fix merkleTree.js or front-end to include abi.encodePacked for proof and root?

Hi @naszam , I haven’t used MerkleProof.sol before, so I will need to get up to speed first and then come back to you. A good place to start is the OpenZeppelin Contracts tests and mock implementation (which I assume you have looked at already) https://github.com/OpenZeppelin/openzeppelin-contrac…

Hi @naszam , I managed to get an example working of verifying msg.sender as a leaf to a Merkle Tree. I used abi.encodePacked: bytes32 leaf = keccak256(abi.encodePacked(msg.sender)); Ideally the code would use abi.encode but I assume this would require changes to merkleTree.js but I didn’t…

Hi @naszam , Hopefully you can get up and running. Let me know how you get on and if you have any questions.

Thanks! I’ll test today! Probably we’d need to open an issue on ethereumjs-util to fix that.

@abcoathup Just tested on my repo (oz-merkle-support), it worked! It seemed for a moment that with ethereumjs-util v7.0.1 was working, then I couldn’t reproduce. I’ve just opened an issue on ethereumjs-util ( https://github.com/ethereumjs/ethereumjs-util/issues/254 ) Also changed the License to MIT…

MerkleProof.sol claim() Error: VM Exception while processing transaction

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MerkleProof.sol claim() Error: VM Exception while processing transaction

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