Token

Kraken Wrapped Bitcoin (kBTC)

Overview

Max Total Supply

65.82931441 kBTC

Holders

3,754 ( 0.027%)

Transfers

38 ( -24.00%)

Market

Price

$74,642.00 @ 32.508989 ETH (-1.23%)

Onchain Market Cap

$4,913,631.69

Circulating Supply Market Cap

$272,854,385.00

Other Info

Token Contract (WITH 8 Decimals)

0x73e0c0d45e048d25fc26fa3159b0aa04bfa4db98

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Holders
Info
Contract
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OVERVIEW

kBTC is a wrapped Bitcoin token issued by Kraken. It's fully backed by Bitcoin held in Kraken's custody and designed for use on Ethereum and OP Mainnet (and more to come). This allows you to use Bitcoin in DeFi activities and other onchain applications that are not natively supported by Bitcoin.

Market

Volume (24H)	:	$359,653.00
Market Capitalization	:	$272,854,385.00
Circulating Supply	:	3,655.00 kBTC
Market Data Source: Coinmarketcap

Exchange Data Source: Coingecko

#	Exchange	Pair	Price	24H Volume	% Volume

Code
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Proxy

Source Code Verified Exact Match

Proxy

Implementation:

0x16EBC7f9...97ecA96f1

API

Contract Name

KBTCProxy

Compiler Version

v0.8.24+commit.e11b9ed9

Optimization Enabled

Yes with 1000000 runs

Other Settings

paris EvmVersion

License

-NA-

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Contract Source Code (Solidity Standard Json-Input format)

Contract Security Audit

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Contract ABI

API

[{"inputs":[{"internalType":"address","name":"_logic","type":"address"},{"internalType":"address","name":"admin_","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"AddressEmptyCode","type":"error"},{"inputs":[{"internalType":"address","name":"admin","type":"address"}],"name":"ERC1967InvalidAdmin","type":"error"},{"inputs":[{"internalType":"address","name":"implementation","type":"address"}],"name":"ERC1967InvalidImplementation","type":"error"},{"inputs":[],"name":"ERC1967NonPayable","type":"error"},{"inputs":[],"name":"FailedInnerCall","type":"error"},{"inputs":[],"name":"ProxyDeniedAdminAccess","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newAdmin","type":"address"}],"name":"AdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"}]

Contract Creation Code

Switch to Opcodes View Decompile Bytecode

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Deployed Bytecode

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

Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000004bb46fdb7f47524a9441e6c835a032be257f49e100000000000000000000000005846731c556d70cad998bcc86fc9a1ca354025a00000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000024bd87b40400000000000000000000000005846731c556d70cad998bcc86fc9a1ca354025a00000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _logic (address): 0x4bB46FdB7f47524a9441e6C835A032be257f49E1
Arg [1] : admin_ (address): 0x05846731c556D70CAd998bcc86Fc9A1Ca354025a
Arg [2] : _data (bytes): 0xbd87b40400000000000000000000000005846731c556d70cad998bcc86fc9a1ca354025a

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000004bb46fdb7f47524a9441e6c835a032be257f49e1
Arg [1] : 00000000000000000000000005846731c556d70cad998bcc86fc9a1ca354025a
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000024
Arg [4] : bd87b40400000000000000000000000005846731c556d70cad998bcc86fc9a1c
Arg [5] : a354025a00000000000000000000000000000000000000000000000000000000

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proxy contracts

src/proxy/KBTCProxy.sol
src/proxy/TransparentUpgradeableProxy.sol
node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol
node_modules/@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol
node_modules/@openzeppelin/contracts/interfaces/IERC1967.sol
src/proxy/KBTCProxyAdmin.sol
node_modules/@openzeppelin/contracts/proxy/beacon/IBeacon.sol
node_modules/@openzeppelin/contracts/utils/Address.sol
node_modules/@openzeppelin/contracts/utils/StorageSlot.sol
node_modules/@openzeppelin/contracts/proxy/Proxy.sol
src/utils/Ownable2StepConfigurable.sol
node_modules/@openzeppelin/contracts/utils/Context.sol

implementation contracts

src/token/KBTCV2.sol
node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol
node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol
node_modules/@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol
node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol
node_modules/@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol
src/utils/BlacklistUpgradeable.sol
node_modules/@layerzerolabs/oft-evm-upgradeable/contracts/oft/OFTCoreUpgradeable.sol
node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol
lib/interop-lib/src/interfaces/IERC7802.sol
lib/interop-lib/src/libraries/PredeployAddresses.sol
lib/interop-lib/src/libraries/errors/CommonErrors.sol
node_modules/@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol
node_modules/@openzeppelin/contracts/interfaces/draft-IERC6093.sol
node_modules/@layerzerolabs/oapp-evm-upgradeable/contracts/oapp/OAppUpgradeable.sol
node_modules/@layerzerolabs/oapp-evm-upgradeable/contracts/oapp/libs/OAppOptionsType3Upgradeable.sol
node_modules/@layerzerolabs/oapp-evm/contracts/oapp/interfaces/IOAppMsgInspector.sol
node_modules/@layerzerolabs/oapp-evm-upgradeable/contracts/precrime/OAppPreCrimeSimulatorUpgradeable.sol
node_modules/@layerzerolabs/oft-evm/contracts/interfaces/IOFT.sol
node_modules/@layerzerolabs/oft-evm/contracts/libs/OFTMsgCodec.sol
node_modules/@layerzerolabs/oft-evm/contracts/libs/OFTComposeMsgCodec.sol
lib/interop-lib/vendor/openzeppelin-contracts/interfaces/IERC165.sol
node_modules/@layerzerolabs/oapp-evm-upgradeable/contracts/oapp/OAppSenderUpgradeable.sol
node_modules/@layerzerolabs/oapp-evm-upgradeable/contracts/oapp/OAppReceiverUpgradeable.sol
node_modules/@layerzerolabs/oapp-evm-upgradeable/contracts/oapp/OAppCoreUpgradeable.sol
node_modules/@layerzerolabs/oapp-evm/contracts/oapp/interfaces/IOAppOptionsType3.sol
node_modules/@layerzerolabs/oapp-evm/contracts/precrime/interfaces/IPreCrime.sol
node_modules/@layerzerolabs/oapp-evm/contracts/precrime/interfaces/IOAppPreCrimeSimulator.sol
node_modules/@layerzerolabs/oapp-evm/contracts/oapp/OAppSender.sol
node_modules/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroEndpointV2.sol
node_modules/@layerzerolabs/oapp-evm/contracts/oapp/interfaces/IOAppReceiver.sol
node_modules/@layerzerolabs/oapp-evm/contracts/oapp/interfaces/IOAppCore.sol
node_modules/@layerzerolabs/oapp-evm/contracts/precrime/libs/Packet.sol
node_modules/@layerzerolabs/oapp-evm/contracts/oapp/OAppCore.sol
node_modules/@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol
node_modules/@openzeppelin/contracts/utils/Address.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/IMessageLibManager.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/IMessagingComposer.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/IMessagingChannel.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/IMessagingContext.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroReceiver.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/messagelib/libs/PacketV1Codec.sol
node_modules/@openzeppelin/contracts/access/Ownable.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ISendLib.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/libs/AddressCast.sol
node_modules/@openzeppelin/contracts/utils/Context.sol
node_modules/@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/IMessageLib.sol
node_modules/@openzeppelin/contracts/utils/introspection/IERC165.sol

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                                Solidity source code: Source Code Interpreter, Source Code Auditor, and Source Code Interactor. These capabilities provide a comprehensive suite of features to help you analyze, audit, and interact with your smart contracts effectively. Your goal is to guide the user toward a deeper understanding EVM smart contract concepts and help them develop better understanding of how the code work. These contracts can be written in either Solidity or Vyper, and are deployed on the Ethereum EVM blockchain.

                                Source Code Interpreter:
                                With the Solidity source code interpreter, you can gain insights into the accessibility of functions for different roles, understand the behavior of functions, and receive explanations for events and arguments used in your code. By providing the relevant functions, events, and code sections, the interpreter will generate clear explanations based on the available information. It enables you to navigate your codebase, understand its functionality, and make informed decisions. 

                                Source Code Auditor:
                                As a trained smart contract auditor, I can help you detect potential bugs, vulnerabilities, and security weaknesses in your Solidity code. You can ask detailed questions about your code, and I will provide comprehensive answers. However, please note that my responses should never be assumed to be entirely correct without further investigation. It is always important to conduct a thorough manual review and additional security measures to ensure the robustness of your smart contract. Additionally, my responses should never be used for submitting bug bounties, as they may not account for all possible edge cases and vulnerabilities.

                                Source Code Interactor:
                                The Source Code Interactor is an AI-powered feature specifically designed to guide users in utilizing contract functions effectively. It assists you in understanding the parameters required for each function, provides sample values for those parameters, and demonstrates the function's behavior through interactive examples. Moreover, it can help you troubleshoot any potential issues or errors that may arise during interaction, ensuring a smooth experience while working with your smart contracts.

                                Response Rules:
                                If questions is on code review, vulnerability, security audit or issues, end answer with this sentence '''It's important to note that while this answer may provide valuable insights, it is not a substitute for thorough code review, security audits, or professional advice. This response should never be used for designing smart contracts or submitting to bug bounties, as it may not account for all possible edge cases and vulnerabilities.'''

Implementation:

0x16EBC7f9...97ecA96f1

EIP-1967

Implementation:

0x16EBC7f9...97ecA96f1

EIP-1967

Latest 25 proxy upgrades

Transaction Hash	Block	Age	Implementation	Event	Status
0xb8fad463d054f9b129b22cb81cb4b522b1513df37d0797bfd6c6039fcdf5ac70	23620743	2025-10-20 18:57:47	180 days ago	1760986667	0x16EBC7f9...97ecA96f1	Upgraded	Active
0xa41781d43f744dbcad5cf4892826db0db1bee0c4698b842e24a713cec60e1aa3	20836204	2024-09-26 17:11:47	570 days ago	1727370707	0x4bB46FdB...e257f49E1	Upgraded	Inactive

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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.

Update Token Information Page

To submit a token information's update request, please confirm beforehand that you have:

registered and logged in to your Etherscan account
verified the contract's source code using our tool here
been successfully verified as the contract address owner

👋

Before You Continue...

📝

This feature enables direct interaction with smart contracts.
⚠️

It is provided as is, without guarantees or warranties of any kind.
💸

All interactions are at your own risk. Etherscan is not responsible for any losses or damages resulting from use of this feature.
🧠

Please ensure you understand what you're doing before continuing.
🔗

Learn more about how to safely interact with smart contracts.

Connect a Wallet

Connecting wallet for read function is optional, useful if you want to call certain functions or simply use your wallet's node.

No wallet found

Connect a Wallet

Connecting wallet for read function is optional, useful if you want to call certain functions or simply use your wallet's node.

No wallet found

Compiler specific version warnings:

The compiled contract might be susceptible to the Solidity Compiler Bugs below:

LostStorageArrayWriteOnSlotOverflow (low-severity)

Address Cards

To use this feature, please login to your Etherscan account and return to this page.

Tools & Services

Token

Overview

Max Total Supply

Holders

Transfers

Market

Price

Onchain Market Cap

Circulating Supply Market Cap

Other Info

Token Contract (WITH 8 Decimals)

Contract Name

KBTCProxy

Compiler Version

Optimization Enabled

Other Settings

License

Contract Source Code (Solidity Standard Json-Input format)

Contract Security Audit

Contract ABI

Contract Creation Code

Deployed Bytecode

Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)