PriceTicker

Unclassified

0x29599b970211...4e818ee5660b

FrontierContract #2,505Exact Bytecode MatchEdit this contract

Deployed October 23, 2015 (11 years ago)Block 428,496

Oraclize's ETH/BTC price ticker from October 2015: keeps Kraken's ETH/XBT price in a public string, refreshed by the oracle every 60 seconds.

Frontier EraVerified Source

Historical Significance

One of the earliest mainnet contracts to read external data through an oracle, and the earliest form of the KrakenPriceTicker example Oraclize later published. Source reconstructed from bytecode; exact runtime and creation match.

Context

Deployed on 23 October 2015 by the Oraclize operator account, before Oraclize published its API and examples on GitHub in December 2015. It uses the interface as it was before that rewrite: a connector address written directly into the contract, a query(uint256,string,string) call and a cb_address() check.

Key Facts

Deployer

0x0047a8...884de8

Deployment Block

428,496

Deployment Date

Oct 23, 2015, 06:11 PM

Code Size

1.9 KB

Gas at Deploy

442,684

Transactions by Year

20151

Deployment Transaction: 0x44ce689ede7f50fd...7952964570db7186

Description

PriceTicker stores the latest Kraken ETH/XBT price in the public string ETHXBT (initialised to "?????"). update() asks Oraclize to fetch json(https://api.kraken.com/0/public/Ticker?pair=ETHXBT).result.XETHXXBT.c.0 with a 60 second delay; __callback() accepts the answer only from the address returned by the connector's cb_address(), stores it and queues the next query. The constructor sends the first query, and kill() self-destructs the contract to the Oraclize operator account. The Oraclize connector address is hardcoded in storage.

Source Verified

SolidityExact bytecode match(1,936 bytes)

Compiler: v0.1.6+

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Heuristic Analysis

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

Detected Type: Unclassified

Contains SELFDESTRUCT opcode

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

Opcodes1,936

Unique Opcodes138

Jump Instructions73

Storage Operations33

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

Verified on Etherscan

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Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
contract Oraclize {
    function query(uint timestamp, string datasource, string arg) returns (bytes32 id);
    function cb_address() returns (address _cbAddress);
}

contract PriceTicker {
    Oraclize oraclize = Oraclize(0xfa5186a0af28454ba31bfc7b1100880b01b2051d);
    string public ETHXBT = "?????";

    function PriceTicker() {
        update();
    }

    function __callback(bytes32 myid, string result) {
        if (msg.sender != oraclize.cb_address()) throw;
        ETHXBT = result;
        update();
    }

    function update() {
        bytes32 myid = oraclize.query(60, "URL", "json(https://api.kraken.com/0/public/Ticker?pair=ETHXBT).result.XETHXXBT.c.0");
    }

    function kill() {
        suicide(0x0047a8033cc6d6ca2ed5044674fd421f44884de8);
    }
}