Contract 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 21


Contract Overview

Wrapped Ether
4,296,479.44926062100692301 Ether

$7,302,812,049.50 (@ $1,699.72/ETH)

Txn Hash
0x4abe43dea8af0157398f5cdaeb0746b1c9a063776cc591604310db4c926a91f1Deposit152980442022-08-07 23:05:0346 secs ago0xac4f6153647b575899d9414a2c2d69b7b7061b9f IN  Wrapped Ether0.4 Ether0.00035372 12.6611437
0x4e7da54d5b040b6dff5a6a2e6da86c62be662c7efab757efaa0d3cff1d9dc5ccWithdraw152980442022-08-07 23:05:0346 secs ago0x6df4b48b0b5b46a1626b08bd599c0d03e0b65a01 IN  Wrapped Ether0 Ether0.00039999 13.1611437
0x82690dbac4686ca91daf1843a2bbe6cef2ed4999b0a913cd27b7e7fd492c51b3Deposit152980432022-08-07 23:04:5950 secs agoENS Name eagle954.eth IN  Wrapped Ether0.44 Ether0.00053344 11.84430887
0x09710e1b6b528f29460cc867a8a16f7106fc7a8932d7d850bd387d129983ada1Approve152980422022-08-07 23:04:441 min agoENS Name birdwizard.eth IN  Wrapped Ether0 Ether0.00055323 11.95406043
0x43ef9c8cf203fde17cdfbdcb442b31dc54f75f6c32c1b3ad789448321b56fb55Approve152980412022-08-07 23:04:291 min ago0x84209f51555d5dad19bdc8fa38d944faee5736f7 IN  Wrapped Ether0 Ether0.00045918 9.90382022
0xb4659aaebe17b7b969722b8b06638efc4ee864a73527193856eb7c954d6300dfDeposit152980382022-08-07 23:03:591 min ago0x6fbf9eb0bcd0dd1267fe607303eaef74c061714a IN  Wrapped Ether0.00703762 Ether0.00048099 10.67983476
0xc43476436c795e2f9e83ad20d3911efe1c400c9600d6b6f9af3f823abe487c7fWithdraw152980382022-08-07 23:03:591 min agoENS Name sheru.eth IN  Wrapped Ether0 Ether0.00032907 10.82343916
0x3c0cd83992347a685451a3417c8add40941ca0bbf3f1181536689e2cb5e6cc1eDeposit152980382022-08-07 23:03:591 min agoENS Name tuuqai.eth IN  Wrapped Ether0.88 Ether0.00030837 11.03780175
0x26b5ee7de3ba1c66f2983d891fc9819c926dfb47d99e27b64a04918107dbba41Withdraw152980372022-08-07 23:03:501 min ago0x43211cccdc8d5a9f9d0319f8803ccfc1ab9a4bc7 IN  Wrapped Ether0 Ether0.0002954 9.715962
0x153e38cf1034d32db09ad9619402b3164fbca000aa9dc4a2b07913e89d1b1e22Deposit152980362022-08-07 23:03:242 mins ago0x4e34c707a3f5c91b07056cb3de918ebe5505c999 IN  Wrapped Ether0.016 Ether0.00037645 8.35866274
0xfd963fe5c3ecaf9a9d73a37c17bb0ee3893a1a4d85cf93ca6f2191fe2f77ecacWithdraw152980362022-08-07 23:03:242 mins agoENS Name lunafinder.eth IN  Wrapped Ether0 Ether0.00026933 8.85866274
0x1ab412a3e1c3b74b4c743fa653bcee6ff04836625eda02c6fb15278d662795aaWithdraw152980362022-08-07 23:03:242 mins agoENS Name mugiwara-iv.eth IN  Wrapped Ether0 Ether0.00031186 8.85866274
0x8cc3fd8965ff344174254b8e950372f59128dcb45d190b4e1f483c85e02deb0eWithdraw152980362022-08-07 23:03:242 mins ago0x3cb4be1c3e17da1609572e351128179dcde99735 IN  Wrapped Ether0 Ether0.00032946 9.35866274
0xd8f387da27dd456d464d0007f0d05a1f84d1060c275d0d43c7ec458cdd48cd9eApprove152980362022-08-07 23:03:242 mins ago0xff3afa79a6b7495df9b3f804390964e4c0457c5b IN  Wrapped Ether0 Ether0.00043311 9.35866274
0x4e90c2ffc1a24a1b72309e07f8d2515d5c4cc397c15fb2493ad41fd6adf67128Approve152980362022-08-07 23:03:242 mins agoENS Name beeteegee.eth IN  Wrapped Ether0 Ether0.00043311 9.35866274
0x5fe63b8272cc116f77b235d454c3947f76ac705303b39279c3065e1cb81ff02cApprove152980342022-08-07 23:03:082 mins ago0x444345976084ad9abd10b6b26a01ccb007d91a1c IN  Wrapped Ether0 Ether0.00034306 7.41272463
0x8401de044240578355dde7e99c38e33d5c059318ae529c4aa7bb59c8e5feb619Withdraw152980342022-08-07 23:03:082 mins ago0x66871ce3ee037e9b1264b0483eca4cd100160c55 IN  Wrapped Ether0 Ether0.00027855 7.91272463
0xc0c1dde95ed850bef3ede673f89bc8e41177eec80f0bced8e41297968f7d487eWithdraw152980342022-08-07 23:03:082 mins ago0x2d69ee10622a795e1064f89fb30ff40163b4781a IN  Wrapped Ether0 Ether0.00024067 7.91272463
0x049d86dc7f413ea1e9c6561c7201791c68ce105e9502a6f97e4b99c95d555a78Withdraw152980342022-08-07 23:03:082 mins agoENS Name concret.eth IN  Wrapped Ether0 Ether0.00024057 7.91272463
0xa15ca87492cf7d3521f9d5ae56b9f7e491a93f910b7b613b1b33aba2daba5e26Approve152980342022-08-07 23:03:082 mins ago0x56028cc0dacbcdc2fc9bd83ffed524391cc3cee2 IN  Wrapped Ether0 Ether0.00038934 8.41272463
0xc529d9842121e8ee55858488335dc7ccd318321423af17f16bb6343050bea77bApprove152980342022-08-07 23:03:082 mins agoENS Name lobzztr.eth IN  Wrapped Ether0 Ether0.00038934 8.41272463
0xf1e942d73caa1040d80fbcabea8dc5185435d74d47b1bad627d4ce6a7e42ee15Deposit152980332022-08-07 23:02:343 mins agoENS Name birdwizard.eth IN  Wrapped Ether2 Ether0.00030432 6.75699019
0xa529723f0777abad83bc43c1501e5d371c5cba8876742b90f3e79e00c361abe5Withdraw152980332022-08-07 23:02:343 mins ago0xa2bf60058c0657c45fdd1741220b4a7f0da91ca3 IN  Wrapped Ether0 Ether0.000228137.49466011
0x04b6ef5b1bc91bade02c5742fcbadfec44d3f289eacc83c36fcb03e9479de460Withdraw152980322022-08-07 23:02:153 mins ago0x0351c074d4b27dc275d4468cba9ac6832319d8fc IN  Wrapped Ether0 Ether0.00018783 6.17311902
0x8aa50557b3b815e7bf84cf5f25122ffbe11954862df5998b93d35d75d114b56eWithdraw152980322022-08-07 23:02:153 mins ago0x963b4d16cfedb52bc103cbd65e7f39f95e5078ef IN  Wrapped Ether0 Ether0.00020288 6.67311902
[ Download CSV Export 
Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x196a20dcdf2ecc3635576f96eed7c500a1cc087e0df06a3937bb180ca99b1a01152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.19391278 Ether
0xc42861284d0e2d33c9c1ce22d62055f3b990c7832a8b47b5342e2e84f90ad297152980442022-08-07 23:05:0346 secs ago Wrapped Ether 0xa2398842f37465f89540430bdc00219fa9e4d28a0.07773095 Ether
0x15981406e979ed5bc49b9f35f99e94c846bb4e5f3a69a49028e1dc35cc3c273a152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V3: Router 20.26555576 Ether
0xf22232fb324dda33c3e3f8705cc791969b8ca9aec974928c7c7f6c8c111f0a01152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.07953412 Ether
0xc3e8340ed1afdacab5cc6d31e0b5dcb4808bd8c58477ffeb3b0019b8fd1ae323152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.12 Ether
0x4f7e841f398b4bf6221a7a6bd08758296b35eb666374c30348bb3da119312689152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.28324223 Ether
0xd9f39c771bb07570587442acf53ce6b4c1e53019375b79bcd33326e095a0c61b152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.129 Ether
0x644cf0a5496d601be775477417c1e316721570ea5f13ebd5a5975099ac25367d152980442022-08-07 23:05:0346 secs ago Wrapped Ether Across Protocol: Ethereum Spoke Pool V20.19911462 Ether
0xd2755aabc0e01a2ed7cede6edd56b3ded8be9b45c409f787aba279cb7986ef06152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.27999937 Ether
0x87b549fcafdf8581d2826aec1e02dede017bb95a6cf51fb3f42dd1cda91b3bcc152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V3: Router 21.73827442 Ether
0x9d952f75c222d65b39c815cb6a1e5929cfb9f58d8ba1d210fd88c7dc3cd13fac152980442022-08-07 23:05:0346 secs ago 1inch: Aggregation Executor 1 Wrapped Ether0.09679388 Ether
0x9290bb02634ae4d0f7336be961619282f0a5a58369ed95f4e31fae95cc744853152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V3: Router 20.3 Ether
0x7438bc534f851a51a6f5415ebe07bbd48cfdad5d97ec74039508e0e8b91e26bb152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.14 Ether
0xb42e42fe02d6fb084f2511b34fa9620accd20775c5abec25d0b24c047a340fc3152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.15 Ether
0x281d78369e6c6f9d96b0bce5f374cc9437e420721ac2a46f282cb1dfe8450b46152980442022-08-07 23:05:0346 secs ago Wrapped Ether 0x: Exchange Proxy0.20009093 Ether
0x728b5400f64c1f59961c1850e18883c40c0f673cde6c35c527ed8f4a5e2d3db0152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V2: Router 20.00631513 Ether
0xd7d094017e6d6ddbb04ecbbcf8bc366f2910e95607c34bba5c2099834ed693c5152980442022-08-07 23:05:0346 secs ago Wrapped Ether 0x: Exchange Proxy0.06048185 Ether
0x250075351786021296467546d359d739f251036508f852e2403dc088082eacdb152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.21411877 Ether
0x444a28da6e6945dc0f7f7f35b9603225c9198064d876a8464b3b90e739fecf41152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V2: Router 20.18342034 Ether
0x20056027bad2b334518af4c422ecbf0fb95b0ab27225d2bed5caa8ad661f6a20152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V2: Router 20.1835396 Ether
0x20056027bad2b334518af4c422ecbf0fb95b0ab27225d2bed5caa8ad661f6a20152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V2: Router 20.040345 Ether
0xa09a1be2746da3306cf3acd3075974ecd04cee43e1e0294fc6502dfba8dc3a1b152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.75 Ether
0x9abe5a9861283781c4e3ee810bbd0be94695004ccb66628103fa2a207ebe5e12152980442022-08-07 23:05:0346 secs ago Uniswap V3: Router 2 Wrapped Ether0.19841312 Ether
0x87a86a0d375017129cf6212b4dfd8d609e1fa1a3664667afa9bd915468f7d49f152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V3: Router 20.05870776 Ether
0x87a86a0d375017129cf6212b4dfd8d609e1fa1a3664667afa9bd915468f7d49f152980442022-08-07 23:05:0346 secs ago Wrapped Ether Uniswap V2: Router 20.00634505 Ether
[ Download CSV Export 

Contract Source Code Verified (Exact Match)

Contract Name:

Compiler Version

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
 *Submitted for verification at on 2017-12-12

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <>.

pragma solidity ^0.4.18;

contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed src, address indexed guy, uint wad);
    event  Transfer(address indexed src, address indexed dst, uint wad);
    event  Deposit(address indexed dst, uint wad);
    event  Withdrawal(address indexed src, uint wad);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        Withdrawal(msg.sender, wad);

    function totalSupply() public view returns (uint) {
        return this.balance;

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);

    function transferFrom(address src, address dst, uint wad)
        returns (bool)
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;

                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <>
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machine-readable Corresponding Source under the terms of this License,
in one of these ways:

    a) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by the
    Corresponding Source fixed on a durable physical medium
    customarily used for software interchange.

    b) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by a
    written offer, valid for at least three years and valid for as
    long as you offer spare parts or customer support for that product
    model, to give anyone who possesses the object code either (1) a
    copy of the Corresponding Source for all the software in the
    product that is covered by this License, on a durable physical
    medium customarily used for software interchange, for a price no
    more than your reasonable cost of physically performing this
    conveying of source, or (2) access to copy the
    Corresponding Source from a network server at no charge.

    c) Convey individual copies of the object code with a copy of the
    written offer to provide the Corresponding Source.  This
    alternative is allowed only occasionally and noncommercially, and
    only if you received the object code with such an offer, in accord
    with subsection 6b.

    d) Convey the object code by offering access from a designated
    place (gratis or for a charge), and offer equivalent access to the
    Corresponding Source in the same way through the same place at no
    further charge.  You need not require recipients to copy the
    Corresponding Source along with the object code.  If the place to
    copy the object code is a network server, the Corresponding Source
    may be on a different server (operated by you or a third party)
    that supports equivalent copying facilities, provided you maintain
    clear directions next to the object code saying where to find the
    Corresponding Source.  Regardless of what server hosts the
    Corresponding Source, you remain obligated to ensure that it is
    available for as long as needed to satisfy these requirements.

    e) Convey the object code using peer-to-peer transmission, provided
    you inform other peers where the object code and Corresponding
    Source of the work are being offered to the general public at no
    charge under subsection 6d.

  A separable portion of the object code, whose source code is excluded
from the Corresponding Source as a System Library, need not be
included in conveying the object code work.

  A "User Product" is either (1) a "consumer product", which means any
tangible personal property which is normally used for personal, family,
or household purposes, or (2) anything designed or sold for incorporation
into a dwelling.  In determining whether a product is a consumer product,
doubtful cases shall be resolved in favor of coverage.  For a particular
product received by a particular user, "normally used" refers to a
typical or common use of that class of product, regardless of the status
of the particular user or of the way in which the particular user
actually uses, or expects or is expected to use, the product.  A product
is a consumer product regardless of whether the product has substantial
commercial, industrial or non-consumer uses, unless such uses represent
the only significant mode of use of the product.

  "Installation Information" for a User Product means any methods,
procedures, authorization keys, or other information required to install
and execute modified versions of a covered work in that User Product from
a modified version of its Corresponding Source.  The information must
suffice to ensure that the continued functioning of the modified object
code is in no case prevented or interfered with solely because
modification has been made.

  If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as
part of a transaction in which the right of possession and use of the
User Product is transferred to the recipient in perpetuity or for a
fixed term (regardless of how the transaction is characterized), the
Corresponding Source conveyed under this section must be accompanied
by the Installation Information.  But this requirement does not apply
if neither you nor any third party retains the ability to install
modified object code on the User Product (for example, the work has
been installed in ROM).

  The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates
for a work that has been modified or installed by the recipient, or for
the User Product in which it has been modified or installed.  Access to a
network may be denied when the modification itself materially and
adversely affects the operation of the network or violates the rules and
protocols for communication across the network.

  Corresponding Source conveyed, and Installation Information provided,
in accord with this section must be in a format that is publicly
documented (and with an implementation available to the public in
source code form), and must require no special password or key for
unpacking, reading or copying.

  7. Additional Terms.

  "Additional permissions" are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law.  If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.

  When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it.  (Additional permissions may be written to require their own
removal in certain cases when you modify the work.)  You may place
additional permissions on material, added by you to a covered work,
for which you have or can give appropriate copyright permission.

  Notwithstanding any other provision of this License, for material you
add to a covered work, you may (if authorized by the copyright holders of
that material) supplement the terms of this License with terms:

    a) Disclaiming warranty or limiting liability differently from the
    terms of sections 15 and 16 of this License; or

    b) Requiring preservation of specified reasonable legal notices or
    author attributions in that material or in the Appropriate Legal
    Notices displayed by works containing it; or

    c) Prohibiting misrepresentation of the origin of that material, or
    requiring that modified versions of such material be marked in
    reasonable ways as different from the original version; or

    d) Limiting the use for publicity purposes of names of licensors or
    authors of the material; or

    e) Declining to grant rights under trademark law for use of some
    trade names, trademarks, or service marks; or

    f) Requiring indemnification of licensors and authors of that
    material by anyone who conveys the material (or modified versions of
    it) with contractual assumptions of liability to the recipient, for
    any liability that these contractual assumptions directly impose on
    those licensors and authors.

  All other non-permissive additional terms are considered "further
restrictions" within the meaning of section 10.  If the Program as you
received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further
restriction, you may remove that term.  If a license document contains
a further restriction but permits relicensing or conveying under this
License, you may add to a covered work material governed by the terms
of that license document, provided that the further restriction does
not survive such relicensing or conveying.

  If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.

  Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions;
the above requirements apply either way.

  8. Termination.

  You may not propagate or modify a covered work except as expressly
provided under this License.  Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).

  However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the copyright
holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.

  Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.

  Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License.  If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.

  9. Acceptance Not Required for Having Copies.

  You are not required to accept this License in order to receive or
run a copy of the Program.  Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance.  However,
nothing other than this License grants you permission to propagate or
modify any covered work.  These actions infringe copyright if you do
not accept this License.  Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.

  10. Automatic Licensing of Downstream Recipients.

  Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License.  You are not responsible
for enforcing compliance by third parties with this License.

  An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations.  If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.

  You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License.  For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.

  11. Patents.

  A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based.  The
work thus licensed is called the contributor's "contributor version".

  A contributor's "essential patent claims" are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version.  For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.

  Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.

  In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement).  To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.

  If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients.  "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.

  If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.

  A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License.  You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.

  Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.

  12. No Surrender of Others' Freedom.

  If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all.  For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.

  13. Use with the GNU Affero General Public License.

  Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work.  The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.

  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

  Each version is given a distinguishing version number.  If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation.  If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.

  If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.

  Later license versions may give you additional or different
permissions.  However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.

  15. Disclaimer of Warranty.


  16. Limitation of Liability.


  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <>.

Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read


Contract Security Audit

Contract ABI



Swarm Source

Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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