An on-chain messaging contract from 8 August 2015 whose sendMessage only advances the nonce and stores nothing.
Historical Significance
An on-chain messaging contract deployed on 8 August 2015 by 0x8674c218f0351a62c3ba78c34fd2182a93da94e2, the most prolific deployer of Ethereum's second day. Messages live in mapping (address => mapping (bytes32 => Message)) where Message pairs a uint64 timestamp with a string body, alongside mapping (address => bytes32[]) hashes and a uint nonce that would have supplied each message its key. Recipients read their own mail through getMessageHashes, getMessageTime and getMessageContents, all keyed on msg.sender, and deleteMessage clears the stored message and then scans the caller's hash list and zeroes the matching entry. sendMessage is the unfinished part: it takes a recipient and a string, decodes both, and does nothing with them except advance the nonce, so no message could ever be stored. The working sendMessage arrives in the next contract the same author deployed. Source recovered by exact bytecode match: solc v0.1.1+commit.6ff4cd6 with the optimizer on reproduces all 1216 bytes of the creation transaction.
Context
Deployed 8 August 2015, the second day of the Ethereum Frontier network.
Key Facts
Description
An on-chain messaging contract deployed on 8 August 2015 by 0x8674c218f0351a62c3ba78c34fd2182a93da94e2, the most prolific deployer of Ethereum's second day. Messages live in mapping (address => mapping (bytes32 => Message)) where Message pairs a uint64 timestamp with a string body, alongside mapping (address => bytes32[]) hashes and a uint nonce that would have supplied each message its key. Recipients read their own mail through getMessageHashes, getMessageTime and getMessageContents, all keyed on msg.sender, and deleteMessage clears the stored message and then scans the caller's hash list and zeroes the matching entry. sendMessage is the unfinished part: it takes a recipient and a string, decodes both, and does nothing with them except advance the nonce, so no message could ever be stored. The working sendMessage arrives in the next contract the same author deployed. Source recovered by exact bytecode match: solc v0.1.1+commit.6ff4cd6 with the optimizer on reproduces all 1216 bytes of the creation transaction.
Source Verified
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.
Frontier Era
The initial release of Ethereum. A bare-bones implementation for technical users.
Bytecode Overview
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
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