MessagingContract v3

other

0x59622442b567...c56e1e0841ca

FrontierContract #46Source VerifiedEdit this contract

Deployed August 8, 2015 (11 years ago)Block 54,329

A deployment of the nonce-based messaging contract, identical interface to rank 45 but by a different deployer.

Frontier EraVerified Source

Historical Significance

Part of the earliest on-chain messaging experiments on Ethereum Frontier.

Context

Deployed during Ethereum Frontier week 1 as part of a series of messaging contract iterations.

Key Facts

Deployer

0x8674c2...da94e2

Deployment Block

54,329

Deployment Date

Aug 8, 2015, 04:45 PM

Code Size

1.2 KB

Gas at Deploy

340,017

Transactions by Year

20152

Deployment Transaction: 0xd1324021689838fa...f3ec7dcd84bf7d0b

Description

A messaging contract deployed at block 54,329 (August 2015) with the same function interface as rank 45, including the nonce counter for unique message hashing. Deployed by a different address, suggesting the source code was shared or published as a tutorial.

Source Verified

SolidityNear-exact bytecode match

Compiler: soljson

near_exact_match: reconstructed source with nonce-based sha3 hashing. All selectors confirmed via openchain.xyz (including affed0e0=nonce()).

Heuristic Analysis

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

Detected Type: other

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

Opcodes1,216

Unique Opcodes93

Jump Instructions59

Storage Operations25

Verified Source Available

Source verified through compiler archaeology (near-exact bytecode match).

Show source code (Solidity)

contract Messaging {
    mapping(bytes32 => string) messageContents;
    mapping(bytes32 => uint) messageTime;
    mapping(address => bytes32[]) public hashes;
    mapping(address => mapping(bytes32 => bool)) public messages;
    uint public nonce;

    function sendMessage(address to, string content) {
        bytes32 h = sha3(msg.sender, to, content, nonce++);
        messageContents[h] = content;
        messageTime[h] = block.timestamp;
        hashes[to].push(h);
    }

    function getMessageContents(bytes32 hash) constant returns (string) {
        return messageContents[hash];
    }

    function getMessageTime(bytes32 hash) constant returns (uint) {
        return messageTime[hash];
    }

    function deleteMessage(bytes32 hash) {
        delete messageContents[hash];
        delete messageTime[hash];
    }
}

External Links

Etherscan Verified Source (if any)

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