Deadman Switch

escrow

0xa73961e6c1e5...834e34aa9215

FrontierContract #4,141Exact Bytecode MatchEdit this contract

Deployed November 22, 2015 (10 years ago)Block 580,469

Dead man's switch: owner pings to stay alive, trustee can withdraw after 1000 seconds of inactivity

Frontier EraVerified Source

Context

Experimental dead man's switch contract by Vitalik Buterin (Nov 2015). Owner must call ping() periodically; after 1000 seconds of inactivity, designated trustee can call withdraw(). Verified: compiled with Serpent bc4ce59, exact runtime bytecode match.

Key Facts

Deployer

Vitalik Buterin(0x1db343...fa6ee6)

Deployment Block

580,469

Deployment Date

Nov 22, 2015, 05:05 PM

Code Size

306.0 B

Gas at Deploy

115,113

Transactions by Year

20151

Deployment Transaction: 0xd0842bb4337cafa7...973a80e6857e8d95

Description

Deployed by Vitalik Buterin. A dead man's switch: the owner periodically pings the contract to prove liveness; if no ping arrives within roughly 1000 seconds, a designated trustee is allowed to withdraw the balance.

Source Verified

SerpentExact bytecode match(306 bytes)

Compiler: Serpent

View verification proof

Exact 284-byte runtime match. Compiled with Serpent bc4ce59. Runtime extracted as result[14:14+284].

Heuristic Analysis

The following characteristics were detected through bytecode analysis and may not be accurate.

Detected Type: escrow

Frontier Era

The initial release of Ethereum. A bare-bones implementation for technical users.

Block span: 0 — 1,149,999

July 30, 2015 — March 14, 2016

Bytecode Overview

Opcodes306

Unique Opcodes65

Jump Instructions24

Storage Operations9

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Serpent)

data lastPing
data trustee
data owner

def ping():
    if msg.sender == self.owner:
        self.lastPing = block.timestamp

def setTrustee(x:address):
    if msg.sender == self.owner:
        self.trustee = x

def withdraw(to:address, amount:int256):
    if msg.sender == self.owner:
        send(to, amount)
        return(1:bool)
    elif block.timestamp > self.lastPing + 1000 and msg.sender == self.trustee:
        send(to, amount)
        return(1:bool)
    else:
        return(0:bool)

External Links

Etherscan Verified Source (if any)

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