Address io192tqzqe44x34eg5u537ntmv8xrxg8xee7j3acg

Contract Overview

Balance:
0 IOTX

IOTX Value:
$ 0

Token:
Txn Hash
Block
From
To
Value [Txn Fee]
3dab80c0ee72ed16fc7038ecc869b9418b8de6c08cf2699128f9a199354cc10c 24945724 2024-03-01 08:09:05 +0000 UTC 2 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.767716
0566a76bfe6eca730095e2b865045b63be07e55bf162edd193b6900ffcc3fb06 24780135 2024-02-20 09:27:55 +0000 UTC 3 months ago io1chdsk82xqyna2t3jv8eaxcvvjgq9etnhmdrrdl  IN    Contract: DepinRC20Factory 0 IOTX 1.767712
6c284ef5880f78e05f1fa7d72f32179cbc5ebcd4aae4402ec362ecba1f32d499 24408598 2024-01-23 03:28:40 +0000 UTC 4 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
10bab3e96e6255a242b353fd9d169eae499ee9d0f243fdc94e1091df4124a584 24330371 2024-01-18 10:47:15 +0000 UTC 4 months ago io1vc0h87cyh35xhqn3y8ap6prc5n2xshrt6qj2tu  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
17ed66b750a7a11ca4971f2afc0ddf1c370779df595b884314d2bd4136755d87 24324938 2024-01-18 02:55:45 +0000 UTC 4 months ago io1gu8tfq5swakrwrl66c3yxe9xqjhdleaez2ce3h  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
c8652584600c934e51673e951028a40317041ae06e018757ce98a99ccd482f0c 24217347 2024-01-11 10:52:45 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
55e7505d70cb1620cdc2191c7ae09d85fa9a91e88117c40abcfc3cd063715a76 24216988 2024-01-11 10:19:25 +0000 UTC 4 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
5fbb19a3c8bd3568bf3dcddbe7b615d6a7877be701ab05489e1aa1310d5149be 24216975 2024-01-11 10:18:05 +0000 UTC 4 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
e8303976162d19922e0a490ef98c7431046faa6aeeed0e9302a2d367809acb6f 24216685 2024-01-11 09:51:35 +0000 UTC 4 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
d7853fdac9abe42d996554788313ad974e4ae260f8ad798dffa67e707a835447 24216543 2024-01-11 09:38:55 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
7b2c0f92be48279ea85c4b7c00c729da0a97f0e415b0a9081c7353e4bb0ba15d 24216499 2024-01-11 09:34:40 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
0330e72fd41a5604403d08a8ead0d653007edd88e1b6bdc97f471aeee4c4aacb 24215050 2024-01-11 07:22:30 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
6d9dea6943048ddec1f219888573e2bd844ddbe420cdbabdc0fdd0e7a2a1c827 24215012 2024-01-11 07:19:00 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
244b73b93b4225bbc9c10d0b0d442347aa4222ffe15b77d7362a81437bfa2c03 24214767 2024-01-11 06:56:50 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
754fe3df5be8ea51ae04f66e9b02c13ec809a6f47840ce3ff66a09b78ce158b4 24214511 2024-01-11 06:32:50 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
77c0923847e887f4fe77efb35dd5fa62ff7aa8737c2701fe8d67ace6af552080 24214274 2024-01-11 06:11:00 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767068
704b336bd933c2b6ede8f51fa3ce82945f4246b5f7985f2dae96a70b9d1a2659 24214027 2024-01-11 05:48:05 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
f055b3ee94e1724c0e84db0c6b6924ff94d48e75407061e37d3c504eb2375c9b 24214005 2024-01-11 05:46:10 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
a016060f56b83bc7f5e768ce38aa9347f81e6db6e5307372367e42e807d6ee91 24199946 2024-01-10 08:33:30 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
847b527123b3266d554aba2abc3ec60b84a42cdb87b76458fdb1594d872babfc 24195950 2024-01-10 02:31:30 +0000 UTC 4 months ago io1zfzwphsz3lvh5gjwn4rgga8entm4akutyjjzvs  IN    Contract: DepinRC20Factory 0 IOTX 1.767072
f8f3e872607e454e9b390ec060f9e6569793cd2249e4a41d35cd491e0757f9c9 24195913 2024-01-10 02:28:15 +0000 UTC 4 months ago io1wprce0h9c70p3qz85p8a57n7wkmacm0yfg6vyl  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
6862baa44aedd4bb279c776d1b275075c9e9e1cd1fa389ce124b2c4aa9ec054f 24195884 2024-01-10 02:25:45 +0000 UTC 4 months ago io1wprce0h9c70p3qz85p8a57n7wkmacm0yfg6vyl  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
d81ff78daafbdc493b75efa3fe949cc3dfdc0838cae096c999cdda12af4fb661 23990203 2023-12-28 07:53:15 +0000 UTC 4 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
ac23b2e206f69196ea1e927f82b42a19647f4a2ba1e72ef07f75c2cfbdf28e3a 23989061 2023-12-28 06:13:50 +0000 UTC 4 months ago io1lx3pjp47aypfvrm8gmaeyarkuqplln884kpehd  IN    Contract: DepinRC20Factory 0 IOTX 1.764272
42c75bf4c4d700cbb0b16eef1565bef2d82739bec83523a40d5408f631e4d04d 23987012 2023-12-28 03:13:35 +0000 UTC 4 months ago io1gu8tfq5swakrwrl66c3yxe9xqjhdleaez2ce3h  IN    Contract: DepinRC20Factory 0 IOTX 1.781372
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Contract Source Code Verified (Exact Match)

Contract Name:
DepinRC20Factory

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license
File 1 of 7: Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 2 of 7: DepinRC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

import "./ERC20.sol";

contract DepinRC20 is ERC20 {
    uint256 constant bn254Prime = 21888242871839275222246405745257275088548364400416034343698204186575808495617;

    uint256 public difficulty;
    uint256 public limitPerMint;
    uint256 public challenge;
    uint256 public totalSupplyCap;
    uint256 public miningLimit;
    uint8 private _decimals;

    address public verifier;
    bytes32 public difficultyFr;
    bytes32 public depinRCFr;

    mapping(address => uint256) public miningTimes;
    mapping(address => mapping(uint256 => bool)) public minedNonces;

    constructor(
        string memory name,
        string memory symbol,
        uint256 _initialSupply,
        uint8 _decimals_,
        uint256 _difficulty,
        uint256 _miningLimit,
        uint256 _initialLimitPerMint,
        address _verifier
    ) ERC20(name, symbol) {
        _decimals = _decimals_;
        difficulty = _difficulty;
        limitPerMint = _initialLimitPerMint * (10 ** uint256(_decimals));
        challenge = block.timestamp;
        totalSupplyCap = _initialSupply * (10 ** uint256(_decimals));
        miningLimit = _miningLimit;
        verifier = _verifier;

        depinRCFr = uint256ToFr(uint256(uint160(address(this))));
        difficultyFr = uint256ToFr(~uint256(0) >> difficulty);
    }

    function mine(uint256 nonce, address sender, bytes calldata proof) public {
        require(miningTimes[sender] < miningLimit, "Mining limit reached");
        require(
            totalSupply() + limitPerMint <= totalSupplyCap,
            "Total supply cap exceeded"
        );
        require(
            !minedNonces[sender][nonce],
            "Nonce already used for mining"
        );

        bytes32 senderFr = uint256ToFr(uint256(uint160(sender)));
        bytes32 nonceFr = uint256ToFr(nonce);
        bytes memory callData = abi.encodePacked(difficultyFr, depinRCFr, senderFr, nonceFr, proof);

        (bool success,) = verifier.staticcall(callData);
        require(success, "Failed to verify proof");

        _mint(sender, limitPerMint);

        miningTimes[sender]++;
        minedNonces[sender][nonce] = true;
    }

    function uint256ToFr(uint256 _value) public pure returns (bytes32) {
        return bytes32(_value % bn254Prime);
    }

    function transfer(
        address to,
        uint256 amount
    ) public override returns (bool) {
        require(
            totalSupply() >= totalSupplyCap,
            "Transfer not allowed until max supply is reached"
        );
        return super.transfer(to, amount);
    }

    function decimals() public view virtual override returns (uint8) {
        return _decimals;
    }

    function getLimitPerMint() public view returns (uint256) {
        return limitPerMint;
    }

    function getRemainingSupply() public view returns (uint256) {
        return totalSupplyCap - totalSupply();
    }
}

File 3 of 7: DepinRC20Factory.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

import "./DepinRC20.sol";

contract DepinRC20Factory {
    event DepinRC20Created(address newContractAddress);

    address[] public allContracts;

    function createPoWERC20(
        string memory name,
        string memory symbol,
        uint256 _initialSupply,
        uint8 _decimals,
        uint256 _difficulty,
        uint256 _miningLimit,
        uint256 _initialLimitPerMint,
        address _verifier
    ) public returns (address) {
        DepinRC20 newContract = new DepinRC20(
            name,
            symbol,
            _initialSupply,
            _decimals,
            _difficulty,
            _miningLimit,
            _initialLimitPerMint,
            _verifier
        );
        allContracts.push(address(newContract));
        emit DepinRC20Created(address(newContract));
        return address(newContract);
    }

    function getTotalCreatedContracts() public view returns (uint256) {
        return allContracts.length;
    }

    function getAllContracts() public view returns (address[] memory) {
        return allContracts;
    }
}

File 4 of 7: draft-IERC6093.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)

pragma solidity ^0.8.19;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

File 5 of 7: ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

import {IERC20} from "../IERC20.sol";
import {IERC20Metadata} from "../IERC20Metadata.sol";
import {Context} from "../Context.sol";
import {IERC20Errors} from "../draft-IERC6093.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

File 6 of 7: IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

File 7 of 7: IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newContractAddress","type":"address"}],"name":"DepinRC20Created","type":"event"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allContracts","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"uint256","name":"_initialSupply","type":"uint256"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"uint256","name":"_difficulty","type":"uint256"},{"internalType":"uint256","name":"_miningLimit","type":"uint256"},{"internalType":"uint256","name":"_initialLimitPerMint","type":"uint256"},{"internalType":"address","name":"_verifier","type":"address"}],"name":"createPoWERC20","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getAllContracts","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalCreatedContracts","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

Contract Creation Code

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