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Contract Overview
Balance: 0 Ether
Ether Value: $0
Transactions: 31820 txns
Token Tracker: Gastoken.io (GST2)
 Latest 25 transactions from a total of 31820 transactions
(+1 PendingTxn)

TxHash Age From To Value [TxFee]
0x54cc7ee675d5ee45c25b3546b8996b23aa6b3f92345623df15da5d5873df3456(pending)0xbc18c95217c6f404140eaf13fb5d2a50a16516db  IN  0x0000000000b3f879cb30fe243b4dfee438691c040 Ether(Pending)
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d2 days 1 hr ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0xcfe0e1ca550faf68c2ed66f70f719d771e7b8124eb6ecf92de5f00c8fa702ebc2 days 1 hr ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0x16c148cb6423ca764367737d93d552e587668f5358d9449424b808e0e28fcb882 days 1 hr ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x3497421521b19bed59d1e99f595255d422003e20507746345217c91122c0e2482 days 1 hr ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x3e2c362ce15e2da598f99e8dd9ba5fb0a48646c4135fd2587e9332be6e226d8a2 days 1 hr ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0x3180bc9fcc017dee94301c53158db5ec8abed62334ce43e00383fb55c9994e032 days 1 hr ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x2ddbb168d4f433cdda14a44bfc9d0e050afddfbbc5c095dfe9f7fe9e2a1c3da72 days 1 hr ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0x7f101be1c8f0841c9c039aa9b63ce62446b6404997b46671dfd693187bddc0be2 days 1 hr ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0xdc0750a568e60bebb3162cf06afd6af81d02ee4ef591c9efcb927b0e881a32d52 days 1 hr ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0x520ab1b9c6821dfb1d86b9f8e9e6fddbfb5202656f4f736da83df903efe9a5562 days 1 hr ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0xdcef26bf413c280f06f14e6d2e738c9b45321991b6ce6b2415dfbd586b2813a52 days 1 hr ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004277296201
0x9e4c90c9a0cebcdf91d051d75143ede69ebe7ee2c6db05d4b1b5915f9ee7479d2 days 18 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x617d1ee337ee183e7dbae64f076fe1a752e08a623671f83a66d17036e2fd02192 days 18 hrs ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x9b1b3a4b3e33f53ef3eef69cc4b02104d94b264c8147c5737baab8c9c08982702 days 18 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x0d57806a477e1128281ecf6739158a4abe76eeaa72b9048780e8b2a0c88df3ea2 days 18 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x0fdfe5cb9a607995019fecd74291349d912558c86395c0fbd2709f8d03f0e9dd2 days 18 hrs ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0xf911659fed29a99a36670a7d9af6977adca70e8a097302737072403242ceea062 days 18 hrs ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x2409dffcba4745ec793b1b4cd81e16d047df1f2e0463b14c7d0bee3104122a432 days 18 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x7719c7a1d3a1686a49b32ae63358fc3b76cb501246f25531353df0d7bf6120672 days 20 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0xe1e4c05c7df34a0880871ba4fe8ec6c093589411a29ab2dd71976fa954e14fb62 days 20 hrs ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x427a6802a24af5722a785cb6b36d0c0306cb1c8fc412d0bdca156edd31bb27d22 days 20 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0xe3e8ce01fd18aa5bc1090d9f9685e9f48cf2474c99580dda8b5612ec266fdeb32 days 20 hrs ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0xe8c78fc178b0f7e8e79b4e7124aa46d1a8b73ee7cc9ae12ab30191f6e96a496a2 days 20 hrs ago0x6a500061f0d38489addac0993e97a18b9adc75af  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
0x80b75991d7e89d81fabf5d27f10473e26381852749f14125db8c41b24984a1972 days 20 hrs ago0x6a50008f64d3316a2344c55f143e97f1abf7cf94  IN   0x0000000000b3f879cb30fe243b4dfee438691c040 Ether0.004463265601
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 Internal Transactions as a result of Contract Execution
 Latest 25 Internal Txns, Click here To View More View All
ParentTxHash Block Age From To Value
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
0x2007540f7b516c98ccb5ee5ffd0c99bf0eb7e12e004955f793de98955bde896d68985252 days 1 hr ago0x0000000000b3f879cb30fe243b4dfee438691c04  Contract Creation0 Ether
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), NestedArrayFunctionCallDecoder (medium-severity), ZeroFunctionSelector (very low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: GasToken2
Compiler Text: v0.4.16+commit.d7661dd9
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.10;

contract GasToken2 {
    //////////////////////////////////////////////////////////////////////////
    // RLP.sol
    // Due to some unexplained bug, we get a slightly different bytecode if 
    // we use an import, and are then unable to verify the code in Etherscan
    //////////////////////////////////////////////////////////////////////////
    
    uint256 constant ADDRESS_BYTES = 20;
    uint256 constant MAX_SINGLE_BYTE = 128;
    uint256 constant MAX_NONCE = 256**9 - 1;

    // count number of bytes required to represent an unsigned integer
    function count_bytes(uint256 n) constant internal returns (uint256 c) {
        uint i = 0;
        uint mask = 1;
        while (n >= mask) {
            i += 1;
            mask *= 256;
        }

        return i;
    }

    function mk_contract_address(address a, uint256 n) constant internal returns (address rlp) {
        /*
         * make sure the RLP encoding fits in one word:
         * total_length      1 byte
         * address_length    1 byte
         * address          20 bytes
         * nonce_length      1 byte (or 0)
         * nonce           1-9 bytes
         *                ==========
         *                24-32 bytes
         */
        require(n <= MAX_NONCE);

        // number of bytes required to write down the nonce
        uint256 nonce_bytes;
        // length in bytes of the RLP encoding of the nonce
        uint256 nonce_rlp_len;

        if (0 < n && n < MAX_SINGLE_BYTE) {
            // nonce fits in a single byte
            // RLP(nonce) = nonce
            nonce_bytes = 1;
            nonce_rlp_len = 1;
        } else {
            // RLP(nonce) = [num_bytes_in_nonce nonce]
            nonce_bytes = count_bytes(n);
            nonce_rlp_len = nonce_bytes + 1;
        }

        // [address_length(1) address(20) nonce_length(0 or 1) nonce(1-9)]
        uint256 tot_bytes = 1 + ADDRESS_BYTES + nonce_rlp_len;

        // concatenate all parts of the RLP encoding in the leading bytes of
        // one 32-byte word
        uint256 word = ((192 + tot_bytes) * 256**31) +
                       ((128 + ADDRESS_BYTES) * 256**30) +
                       (uint256(a) * 256**10);

        if (0 < n && n < MAX_SINGLE_BYTE) {
            word += n * 256**9;
        } else {
            word += (128 + nonce_bytes) * 256**9;
            word += n * 256**(9 - nonce_bytes);
        }

        uint256 hash;

        assembly {
            let mem_start := mload(0x40)        // get a pointer to free memory
            mstore(0x40, add(mem_start, 0x20))  // update the pointer

            mstore(mem_start, word)             // store the rlp encoding
            hash := sha3(mem_start,
                         add(tot_bytes, 1))     // hash the rlp encoding
        }

        // interpret hash as address (20 least significant bytes)
        return address(hash);
    }
    
    //////////////////////////////////////////////////////////////////////////
    // Generic ERC20
    //////////////////////////////////////////////////////////////////////////

    // owner -> amount
    mapping(address => uint256) s_balances;
    // owner -> spender -> max amount
    mapping(address => mapping(address => uint256)) s_allowances;

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);

    // Spec: Get the account balance of another account with address `owner`
    function balanceOf(address owner) public constant returns (uint256 balance) {
        return s_balances[owner];
    }

    function internalTransfer(address from, address to, uint256 value) internal returns (bool success) {
        if (value <= s_balances[from]) {
            s_balances[from] -= value;
            s_balances[to] += value;
            Transfer(from, to, value);
            return true;
        } else {
            return false;
        }
    }

    // Spec: Send `value` amount of tokens to address `to`
    function transfer(address to, uint256 value) public returns (bool success) {
        address from = msg.sender;
        return internalTransfer(from, to, value);
    }

    // Spec: Send `value` amount of tokens from address `from` to address `to`
    function transferFrom(address from, address to, uint256 value) public returns (bool success) {
        address spender = msg.sender;
        if(value <= s_allowances[from][spender] && internalTransfer(from, to, value)) {
            s_allowances[from][spender] -= value;
            return true;
        } else {
            return false;
        }
    }

    // Spec: Allow `spender` to withdraw from your account, multiple times, up
    // to the `value` amount. If this function is called again it overwrites the
    // current allowance with `value`.
    function approve(address spender, uint256 value) public returns (bool success) {
        address owner = msg.sender;
        if (value != 0 && s_allowances[owner][spender] != 0) {
            return false;
        }
        s_allowances[owner][spender] = value;
        Approval(owner, spender, value);
        return true;
    }

    // Spec: Returns the `amount` which `spender` is still allowed to withdraw
    // from `owner`.
    // What if the allowance is higher than the balance of the `owner`?
    // Callers should be careful to use min(allowance, balanceOf) to make sure
    // that the allowance is actually present in the account!
    function allowance(address owner, address spender) public constant returns (uint256 remaining) {
        return s_allowances[owner][spender];
    }

    //////////////////////////////////////////////////////////////////////////
    // GasToken specifics
    //////////////////////////////////////////////////////////////////////////

    uint8 constant public decimals = 2;
    string constant public name = "Gastoken.io";
    string constant public symbol = "GST2";

    // We build a queue of nonces at which child contracts are stored. s_head is
    // the nonce at the head of the queue, s_tail is the nonce behind the tail
    // of the queue. The queue grows at the head and shrinks from the tail.
    // Note that when and only when a contract CREATEs another contract, the
    // creating contract's nonce is incremented.
    // The first child contract is created with nonce == 1, the second child
    // contract is created with nonce == 2, and so on...
    // For example, if there are child contracts at nonces [2,3,4],
    // then s_head == 4 and s_tail == 1. If there are no child contracts,
    // s_head == s_tail.
    uint256 s_head;
    uint256 s_tail;

    // totalSupply gives  the number of tokens currently in existence
    // Each token corresponds to one child contract that can be SELFDESTRUCTed
    // for a gas refund.
    function totalSupply() public constant returns (uint256 supply) {
        return s_head - s_tail;
    }

    // Creates a child contract that can only be destroyed by this contract.
    function makeChild() internal returns (address addr) {
        assembly {
            // EVM assembler of runtime portion of child contract:
            //     ;; Pseudocode: if (msg.sender != 0x0000000000b3f879cb30fe243b4dfee438691c04) { throw; }
            //     ;;             suicide(msg.sender)
            //     PUSH15 0xb3f879cb30fe243b4dfee438691c04 ;; hardcoded address of this contract
            //     CALLER
            //     XOR
            //     PC
            //     JUMPI
            //     CALLER
            //     SELFDESTRUCT
            // Or in binary: 6eb3f879cb30fe243b4dfee438691c043318585733ff
            // Since the binary is so short (22 bytes), we can get away
            // with a very simple initcode:
            //     PUSH22 0x6eb3f879cb30fe243b4dfee438691c043318585733ff
            //     PUSH1 0
            //     MSTORE ;; at this point, memory locations mem[10] through
            //            ;; mem[31] contain the runtime portion of the child
            //            ;; contract. all that's left to do is to RETURN this
            //            ;; chunk of memory.
            //     PUSH1 22 ;; length
            //     PUSH1 10 ;; offset
            //     RETURN
            // Or in binary: 756eb3f879cb30fe243b4dfee438691c043318585733ff6000526016600af3
            // Almost done! All we have to do is put this short (31 bytes) blob into
            // memory and call CREATE with the appropriate offsets.
            let solidity_free_mem_ptr := mload(0x40)
            mstore(solidity_free_mem_ptr, 0x00756eb3f879cb30fe243b4dfee438691c043318585733ff6000526016600af3)
            addr := create(0, add(solidity_free_mem_ptr, 1), 31)
        }
    }

    // Mints `value` new sub-tokens (e.g. cents, pennies, ...) by creating `value`
    // new child contracts. The minted tokens are owned by the caller of this
    // function.
    function mint(uint256 value) public {
        for (uint256 i = 0; i < value; i++) {
            makeChild();
        }
        s_head += value;
        s_balances[msg.sender] += value;
    }

    // Destroys `value` child contracts and updates s_tail.
    //
    // This function is affected by an issue in solc: https://github.com/ethereum/solidity/issues/2999
    // The `mk_contract_address(this, i).call();` doesn't forward all available gas, but only GAS - 25710.
    // As a result, when this line is executed with e.g. 30000 gas, the callee will have less than 5000 gas
    // available and its SELFDESTRUCT operation will fail leading to no gas refund occurring.
    // The remaining ~29000 gas left after the call is enough to update s_tail and the caller's balance.
    // Hence tokens will have been destroyed without a commensurate gas refund.
    // Fortunately, there is a simple workaround:
    // Whenever you call free, freeUpTo, freeFrom, or freeUpToFrom, ensure that you pass at least
    // 25710 + `value` * (1148 + 5722 + 150) gas. (It won't all be used)
    function destroyChildren(uint256 value) internal {
        uint256 tail = s_tail;
        // tail points to slot behind the last contract in the queue
        for (uint256 i = tail + 1; i <= tail + value; i++) {
            mk_contract_address(this, i).call();
        }

        s_tail = tail + value;
    }

    // Frees `value` sub-tokens (e.g. cents, pennies, ...) belonging to the
    // caller of this function by destroying `value` child contracts, which
    // will trigger a partial gas refund.
    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas
    // when calling this function. For details, see the comment above `destroyChilden`.
    function free(uint256 value) public returns (bool success) {
        uint256 from_balance = s_balances[msg.sender];
        if (value > from_balance) {
            return false;
        }

        destroyChildren(value);

        s_balances[msg.sender] = from_balance - value;

        return true;
    }

    // Frees up to `value` sub-tokens. Returns how many tokens were freed.
    // Otherwise, identical to free.
    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas
    // when calling this function. For details, see the comment above `destroyChilden`.
    function freeUpTo(uint256 value) public returns (uint256 freed) {
        uint256 from_balance = s_balances[msg.sender];
        if (value > from_balance) {
            value = from_balance;
        }

        destroyChildren(value);

        s_balances[msg.sender] = from_balance - value;

        return value;
    }

    // Frees `value` sub-tokens owned by address `from`. Requires that `msg.sender`
    // has been approved by `from`.
    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas
    // when calling this function. For details, see the comment above `destroyChilden`.
    function freeFrom(address from, uint256 value) public returns (bool success) {
        address spender = msg.sender;
        uint256 from_balance = s_balances[from];
        if (value > from_balance) {
            return false;
        }

        mapping(address => uint256) from_allowances = s_allowances[from];
        uint256 spender_allowance = from_allowances[spender];
        if (value > spender_allowance) {
            return false;
        }

        destroyChildren(value);

        s_balances[from] = from_balance - value;
        from_allowances[spender] = spender_allowance - value;

        return true;
    }

    // Frees up to `value` sub-tokens owned by address `from`. Returns how many tokens were freed.
    // Otherwise, identical to `freeFrom`.
    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas
    // when calling this function. For details, see the comment above `destroyChilden`.
    function freeFromUpTo(address from, uint256 value) public returns (uint256 freed) {
        address spender = msg.sender;
        uint256 from_balance = s_balances[from];
        if (value > from_balance) {
            value = from_balance;
        }

        mapping(address => uint256) from_allowances = s_allowances[from];
        uint256 spender_allowance = from_allowances[spender];
        if (value > spender_allowance) {
            value = spender_allowance;
        }

        destroyChildren(value);

        s_balances[from] = from_balance - value;
        from_allowances[spender] = spender_allowance - value;

        return value;
    }
}

    Contract ABI  
[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"value","type":"uint256"}],"name":"freeFromUpTo","outputs":[{"name":"freed","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"supply","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"value","type":"uint256"}],"name":"freeFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"}],"name":"freeUpTo","outputs":[{"name":"freed","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"}],"name":"free","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"},{"name":"spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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   Swarm Source:
bzzr://b86bb85a6e7dcfc4473f394716365fd772c0511b80fdd7833b2966335f3a07b2

 

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