Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Entropy
- Optimization enabled
- true
- Compiler version
- v0.5.17+commit.d19bba13
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2024-09-26T15:31:26.886602Z
Contract source code
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.5.1;
contract Lottery_interface {
function get_round() public view returns (uint256);
function get_phase() public view returns (uint8); // 0 - inactive / 1 - deposits phase and entropy collecting / 2 - entropy reveal phase
}
contract Entropy {
address public owner = msg.sender;
address public lottery_contract = 0xc6355B64cd7C7552BF555599645B91858f3c37fE;
struct provider
{
uint256 round;
bytes32 entropy_hash;
}
uint256 public collateral_threshold = 100000 ether; // Collateral for one entropy submission
mapping (bytes32=>bool) public prohibited_hashes; // A mapping of already used entropy submissions
mapping (address=>provider) public entropy_providers; // A mapping of active entropy submissions of the round
uint256 public entropy_reward = 0; // Collected entropy reward for the current round
uint256 public entropy = 0; // A number used as entropy input for the main Lottery Contract
uint256 public current_round = 0;
uint256 public num_providers = 0; // The number of entropy providers for the current round
function() external payable
{
deposit_entropy_reward();
}
function get_entropy() public view returns (uint256)
{
return entropy;
}
function deposit_entropy_reward() public payable
{
entropy_reward += msg.value;
}
function new_round() public only_lottery_contract
{
entropy_reward = address(this).balance; // All unrevealed entropy collaterals are now next round rewards
current_round = Lottery_interface(lottery_contract).get_round(); // Update the round
num_providers = 0;
}
function submit_entropy(bytes32 _entropy_hash) public payable
{
require(msg.value == collateral_threshold, "Collateral amount is incorrect");
require(!prohibited_hashes[_entropy_hash], "This entropy input was already used previously");
require(entropy_providers[msg.sender].round < current_round, "This address is already an entropy provider in this round");
require(Lottery_interface(lottery_contract).get_phase() == 1, "Entropy submissions are only allowed during the depositing lottery phase");
prohibited_hashes[_entropy_hash] = true; // Mark this hash as "already used" to prevent its future uses
entropy_providers[msg.sender].round = current_round;
entropy_providers[msg.sender].entropy_hash = _entropy_hash;
num_providers++;
}
function reveal_entropy(uint256 _entropy_payload, uint256 _salt) public
{
require(entropy_providers[msg.sender].round == current_round, "The address is trying to reveal the entropy for inappropriate round");
require(sha256(abi.encodePacked(_entropy_payload, _salt)) == entropy_providers[msg.sender].entropy_hash, "Entropy values do not match the provided hash");
require(Lottery_interface(lottery_contract).get_phase() == 2, "Entropy reveals are only allowed during the reveal phase");
entropy += _entropy_payload;
msg.sender.transfer(collateral_threshold + (entropy_reward / num_providers));
}
function test_hash(uint256 _entropy_payload, uint256 _salt) pure public returns (bytes32)
{
return sha256(abi.encodePacked(_entropy_payload, _salt));
}
modifier only_owner
{
require(msg.sender == owner);
_;
}
modifier only_lottery_contract
{
require(msg.sender == lottery_contract);
_;
}
}
Contract ABI
[{"type":"fallback","stateMutability":"payable","payable":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"collateral_threshold","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"current_round","inputs":[],"constant":true},{"type":"function","stateMutability":"payable","payable":true,"outputs":[],"name":"deposit_entropy_reward","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"entropy","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"round","internalType":"uint256"},{"type":"bytes32","name":"entropy_hash","internalType":"bytes32"}],"name":"entropy_providers","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"entropy_reward","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"get_entropy","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"lottery_contract","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"new_round","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"num_providers","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"prohibited_hashes","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"reveal_entropy","inputs":[{"type":"uint256","name":"_entropy_payload","internalType":"uint256"},{"type":"uint256","name":"_salt","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"payable","payable":true,"outputs":[],"name":"submit_entropy","inputs":[{"type":"bytes32","name":"_entropy_hash","internalType":"bytes32"}],"constant":false},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"test_hash","inputs":[{"type":"uint256","name":"_entropy_payload","internalType":"uint256"},{"type":"uint256","name":"_salt","internalType":"uint256"}],"constant":true}]
Contract Creation Code
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ByteCode
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