recursive signature signing

gistfile1.txt

SELLER_INFO_TYPE_HASH: constant(bytes32) = keccak256("SellerERC721Addresses(address addr)SellerInfo(address addr,address erc20_address,seller_erc721_addresses SellerERC721Addresses)")
# SELLER_INFO_TYPE_HASH: constant(bytes32) = keccak256("SellerInfo(address addr,address erc20_address)")
SELLER_ERC721_ADDRESSES_TYPE_HASH: constant(bytes32) = keccak256("SellerERC721Addresses(address addr)")

@external
def checkSellerSignature(_sellers_signing_account:address, _signature: Bytes[65], _seller_address: address, _seller_ERC20_address: address, _seller_info: Seller_Info) -> bytes32:
    assert _seller_address != ZERO_ADDRESS, "invalid _seller_address"
    assert _seller_ERC20_address != ZERO_ADDRESS, "invalid _seller_ERC20_address"
    assert _seller_info.erc721_addresses[0].nft_address == 0x0FD4C4Ef9Bbe66217Eb790E5D42A5cC103eeFC90
    assert _seller_info.erc721_addresses[0].price == 5
    assert _seller_info.erc721_addresses[0].weight == 1
    assert _seller_address == 0x0063046686E46Dc6F15918b61AE2B121458534a5
    # assert _seller_ERC20_address ==

    digest: bytes32 = keccak256(
        concat(
            b'\x19\x01',
            self.DOMAIN_SEPARATOR,
            keccak256(
                concat(
                    SELLER_INFO_TYPE_HASH,
                    convert(_seller_address, bytes32),
                    convert(_seller_ERC20_address, bytes32),
                    keccak256(
                        concat(
                            SELLER_ERC721_ADDRESSES_TYPE_HASH,
                            convert(_seller_info.erc721_addresses[0].nft_address, bytes32),
                            # convert(_seller_info.erc721_addresses[0].price, bytes32),
                            # convert(_seller_info.erc721_addresses[0].weight,bytes32),
                        )
                    ),
                )
            )
        )
    )