Elevation storage for a pre release Etheria, sealed when the last column lands
Historical Significance
Etheria was a world with a map, a terrain and rules about what could be built where, put on chain in 2015 when almost nothing on Ethereum kept state worth looking at. Its author had to solve a problem nobody had a pattern for: the map is too large to write in one transaction and useless until it is complete, so the storage contracts fill themselves in over many calls and lock once the last piece lands. Sealing a contract against its own author is a deliberate commitment, made before immutability was a slogan.
Context
Frontier era deployment by Cyrus Adkisson, the author of Etheria.
Key Facts
Description
Stores the 33 by 33 elevation map Etheria builds its terrain from. initElevations writes one column at a time, marks the column in a uint8[33] done array, then scans all 33 entries and locks the contract only once none is still zero. Compare the MapElevationStorage that shipped with Etheria v0.9, which locks on an explicit call to setLocked instead.
Source Verified
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 and exact bytecode matching.
View Verification ProofShow source code (Solidity)
// Submitted by EthereumHistory (ethereumhistory.com)
contract MapElevationStorage
{
uint8[33] elevationsdone;
bool locked;
uint8[33][33] elevations;
function initElevations(uint8 col, uint8[33] _elevations) public
{
if(locked)
return;
elevations[col] = _elevations;
elevationsdone[col] = 1;
for(uint8 i = 0; i < 33; i++)
{
if(elevationsdone[i] == 0)
return;
}
locked = true;
}
function getElevations() constant returns (uint8[33][33])
{
return elevations;
}
function getElevation(uint8 col, uint8 row) constant returns (uint8)
{
return elevations[col][row];
}
}External Links
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