Created
December 21, 2020 20:40
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USDC v2: Upgrading a $1.4B Token - Testing Storage Slot 9
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| // Storage slot 9 contains "balances" (mapping(address => uint256)) | |
| // Derive slot position for the key k | |
| const k = holderAddr.slice(2).toLowerCase().padStart(64, "0"); | |
| const p = "9".padStart(64, "0"); | |
| const valueSlotPos = web3.utils.keccak256("0x" + k + p); | |
| const data = await web3.eth.getStorageAt(contract.address, valueSlotPos); | |
| expect(new BN(data.slice(2), 16).eq(expectedBalance)).to.be.true; |
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