I would like to take a look at the source code of wallet contracts (wallet v3 and v4). As far as I understand, both these contracts are open source, but where exactly is their code located? TON ecosystem is so vast it it not always obvious what's where.
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Here you can see the source code of the wallet v4: https://github.com/ton-blockchain/wallet-contract, wallet v3: https://github.com/ton-blockchain/ton/blob/master/crypto/smartcont/wallet-v3-code.fif
P.S. great article with explanations of each version of wallet contract: https://ton.org/docs/participate/wallets/contracts
