Contract Address Details

0xAA933Baf03cFC55b8E4e0d7De479BCC12f189352

StableToken Last Balance Update: Block #3628982
Created by 0xe23a4c–2b2dee at 0xabf07d–c1ae34

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Contract name:
StableToken




Optimization enabled
false
Compiler version
v0.5.8+commit.23d335f2




Verified at
2020-04-22 22:17:07.483480Z

Contract source code

pragma solidity ^0.5.3;
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
contract Context {
constructor () internal { }
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this;
return msg.data;
}
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
function isOwner() public view returns (bool) {
return _msgSender() == _owner;
}
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
interface IStableToken {
function mint(address, uint256) external returns (bool);
function burn(uint256) external returns (bool);
function setInflationParameters(uint256, uint256) external;
function valueToUnits(uint256) external view returns (uint256);
function unitsToValue(uint256) external view returns (uint256);
function getInflationParameters() external view returns (uint256, uint256, uint256, uint256);
function balanceOf(address) external view returns (uint256);
}
interface ICeloToken {
function transferWithComment(address, uint256, string calldata) external returns (bool);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
contract CalledByVm {
modifier onlyVm() {
require(msg.sender == address(0), "Only VM can call");
_;
}
}
contract Initializable {
bool public initialized;
modifier initializer() {
require(!initialized, "contract already initialized");
initialized = true;
_;
}
}
library FixidityLib {
struct Fraction {
uint256 value;
}
function digits() internal pure returns (uint8) {
return 24;
}
uint256 private constant FIXED1_UINT = 1000000000000000000000000;
function fixed1() internal pure returns (Fraction memory) {
return Fraction(FIXED1_UINT);
}
function wrap(uint256 x) internal pure returns (Fraction memory) {
return Fraction(x);
}
function unwrap(Fraction memory x) internal pure returns (uint256) {
return x.value;
}
function mulPrecision() internal pure returns (uint256) {
return 1000000000000;
}
function maxNewFixed() internal pure returns (uint256) {
return 115792089237316195423570985008687907853269984665640564;
}
function newFixed(uint256 x) internal pure returns (Fraction memory) {
require(x <= maxNewFixed(), "can't create fixidity number larger than maxNewFixed()");
return Fraction(x * FIXED1_UINT);
}
function fromFixed(Fraction memory x) internal pure returns (uint256) {
return x.value / FIXED1_UINT;
}
function newFixedFraction(uint256 numerator, uint256 denominator)
internal
pure
returns (Fraction memory)
{
Fraction memory convertedNumerator = newFixed(numerator);
Fraction memory convertedDenominator = newFixed(denominator);
return divide(convertedNumerator, convertedDenominator);
}
function integer(Fraction memory x) internal pure returns (Fraction memory) {
return Fraction((x.value / FIXED1_UINT) * FIXED1_UINT);
}
function fractional(Fraction memory x) internal pure returns (Fraction memory) {
return Fraction(x.value - (x.value / FIXED1_UINT) * FIXED1_UINT);
}
function add(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {
uint256 z = x.value + y.value;
require(z >= x.value, "add overflow detected");
return Fraction(z);
}
function subtract(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {
require(x.value >= y.value, "substraction underflow detected");
return Fraction(x.value - y.value);
}
function multiply(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {
if (x.value == 0 || y.value == 0) return Fraction(0);
if (y.value == FIXED1_UINT) return x;
if (x.value == FIXED1_UINT) return y;
uint256 x1 = integer(x).value / FIXED1_UINT;
uint256 x2 = fractional(x).value;
uint256 y1 = integer(y).value / FIXED1_UINT;
uint256 y2 = fractional(y).value;
uint256 x1y1 = x1 * y1;
if (x1 != 0) require(x1y1 / x1 == y1, "overflow x1y1 detected");
uint256 fixed_x1y1 = x1y1 * FIXED1_UINT;
if (x1y1 != 0) require(fixed_x1y1 / x1y1 == FIXED1_UINT, "overflow x1y1 * fixed1 detected");
x1y1 = fixed_x1y1;
uint256 x2y1 = x2 * y1;
if (x2 != 0) require(x2y1 / x2 == y1, "overflow x2y1 detected");
uint256 x1y2 = x1 * y2;
if (x1 != 0) require(x1y2 / x1 == y2, "overflow x1y2 detected");
x2 = x2 / mulPrecision();
y2 = y2 / mulPrecision();
uint256 x2y2 = x2 * y2;
if (x2 != 0) require(x2y2 / x2 == y2, "overflow x2y2 detected");
Fraction memory result = Fraction(x1y1);
result = add(result, Fraction(x2y1));
result = add(result, Fraction(x1y2));
result = add(result, Fraction(x2y2));
return result;
}
function reciprocal(Fraction memory x) internal pure returns (Fraction memory) {
require(x.value != 0, "can't call reciprocal(0)");
return Fraction((FIXED1_UINT * FIXED1_UINT) / x.value);
}
function divide(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {
require(y.value != 0, "can't divide by 0");
uint256 X = x.value * FIXED1_UINT;
require(X / FIXED1_UINT == x.value, "overflow at divide");
return Fraction(X / y.value);
}
function gt(Fraction memory x, Fraction memory y) internal pure returns (bool) {
return x.value > y.value;
}
function gte(Fraction memory x, Fraction memory y) internal pure returns (bool) {
return x.value >= y.value;
}
function lt(Fraction memory x, Fraction memory y) internal pure returns (bool) {
return x.value < y.value;
}
function lte(Fraction memory x, Fraction memory y) internal pure returns (bool) {
return x.value <= y.value;
}
function equals(Fraction memory x, Fraction memory y) internal pure returns (bool) {
return x.value == y.value;
}
function isProperFraction(Fraction memory x) internal pure returns (bool) {
return lte(x, fixed1());
}
}
interface IAccounts {
function isAccount(address) external view returns (bool);
function voteSignerToAccount(address) external view returns (address);
function validatorSignerToAccount(address) external view returns (address);
function attestationSignerToAccount(address) external view returns (address);
function signerToAccount(address) external view returns (address);
function getAttestationSigner(address) external view returns (address);
function getValidatorSigner(address) external view returns (address);
function getVoteSigner(address) external view returns (address);
function hasAuthorizedVoteSigner(address) external view returns (bool);
function hasAuthorizedValidatorSigner(address) external view returns (bool);
function hasAuthorizedAttestationSigner(address) external view returns (bool);
function setAccountDataEncryptionKey(bytes calldata) external;
function setMetadataURL(string calldata) external;
function setName(string calldata) external;
function setWalletAddress(address, uint8, bytes32, bytes32) external;
function setAccount(string calldata, bytes calldata, address, uint8, bytes32, bytes32) external;
function getDataEncryptionKey(address) external view returns (bytes memory);
function getWalletAddress(address) external view returns (address);
function getMetadataURL(address) external view returns (string memory);
function batchGetMetadataURL(address[] calldata)
external
view
returns (uint256[] memory, bytes memory);
function getName(address) external view returns (string memory);
function authorizeVoteSigner(address, uint8, bytes32, bytes32) external;
function authorizeValidatorSigner(address, uint8, bytes32, bytes32) external;
function authorizeValidatorSignerWithPublicKey(address, uint8, bytes32, bytes32, bytes calldata)
external;
function authorizeValidatorSignerWithKeys(
address,
uint8,
bytes32,
bytes32,
bytes calldata,
bytes calldata,
bytes calldata
) external;
function authorizeAttestationSigner(address, uint8, bytes32, bytes32) external;
function createAccount() external returns (bool);
}
interface IFeeCurrencyWhitelist {
function addToken(address) external;
function getWhitelist() external view returns (address[] memory);
}
interface IFreezer {
function isFrozen(address) external view returns (bool);
}
interface IRegistry {
function setAddressFor(string calldata, address) external;
function getAddressForOrDie(bytes32) external view returns (address);
function getAddressFor(bytes32) external view returns (address);
function isOneOf(bytes32[] calldata, address) external view returns (bool);
}
interface IElection {
function getTotalVotes() external view returns (uint256);
function getActiveVotes() external view returns (uint256);
function getTotalVotesByAccount(address) external view returns (uint256);
function markGroupIneligible(address) external;
function markGroupEligible(address, address, address) external;
function electValidatorSigners() external view returns (address[] memory);
function vote(address, uint256, address, address) external returns (bool);
function activate(address) external returns (bool);
function revokeActive(address, uint256, address, address, uint256) external returns (bool);
function revokeAllActive(address, address, address, uint256) external returns (bool);
function revokePending(address, uint256, address, address, uint256) external returns (bool);
function forceDecrementVotes(
address,
uint256,
address[] calldata,
address[] calldata,
uint256[] calldata
) external returns (uint256);
}
interface IGovernance {
function isVoting(address) external view returns (bool);
}
interface ILockedGold {
function incrementNonvotingAccountBalance(address, uint256) external;
function decrementNonvotingAccountBalance(address, uint256) external;
function getAccountTotalLockedGold(address) external view returns (uint256);
function getTotalLockedGold() external view returns (uint256);
function getPendingWithdrawals(address)
external
view
returns (uint256[] memory, uint256[] memory);
function getTotalPendingWithdrawals(address) external view returns (uint256);
function lock() external payable;
function unlock(uint256) external;
function relock(uint256, uint256) external;
function withdraw(uint256) external;
function slash(
address account,
uint256 penalty,
address reporter,
uint256 reward,
address[] calldata lessers,
address[] calldata greaters,
uint256[] calldata indices
) external;
function isSlasher(address) external view returns (bool);
}
interface IValidators {
function getAccountLockedGoldRequirement(address) external view returns (uint256);
function meetsAccountLockedGoldRequirements(address) external view returns (bool);
function getGroupNumMembers(address) external view returns (uint256);
function getGroupsNumMembers(address[] calldata) external view returns (uint256[] memory);
function getNumRegisteredValidators() external view returns (uint256);
function getTopGroupValidators(address, uint256) external view returns (address[] memory);
function updateEcdsaPublicKey(address, address, bytes calldata) external returns (bool);
function updatePublicKeys(address, address, bytes calldata, bytes calldata, bytes calldata)
external
returns (bool);
function isValidator(address) external view returns (bool);
function isValidatorGroup(address) external view returns (bool);
function calculateGroupEpochScore(uint256[] calldata uptimes) external view returns (uint256);
function groupMembershipInEpoch(address account, uint256 epochNumber, uint256 index)
external
view
returns (address);
function halveSlashingMultiplier(address group) external;
function forceDeaffiliateIfValidator(address validator) external;
function getValidatorGroupSlashingMultiplier(address) external view returns (uint256);
function affiliate(address group) external returns (bool);
}
interface IRandom {
function revealAndCommit(bytes32, bytes32, address) external;
function randomnessBlockRetentionWindow() external view returns (uint256);
function random() external view returns (bytes32);
function getBlockRandomness(uint256) external view returns (bytes32);
}
interface IAttestations {
function setAttestationRequestFee(address, uint256) external;
function request(bytes32, uint256, address) external;
function selectIssuers(bytes32) external;
function complete(bytes32, uint8, bytes32, bytes32) external;
function revoke(bytes32, uint256) external;
function withdraw(address) external;
function setAttestationExpiryBlocks(uint256) external;
function getMaxAttestations() external view returns (uint256);
function getUnselectedRequest(bytes32, address) external view returns (uint32, uint32, address);
function getAttestationRequestFee(address) external view returns (uint256);
function lookupAccountsForIdentifier(bytes32) external view returns (address[] memory);
function getAttestationStats(bytes32, address) external view returns (uint32, uint32);
function getAttestationState(bytes32, address, address)
external
view
returns (uint8, uint32, address);
function getCompletableAttestations(bytes32, address)
external
view
returns (uint32[] memory, address[] memory, uint256[] memory, bytes memory);
}
interface IExchange {
function exchange(uint256, uint256, bool) external returns (uint256);
function setUpdateFrequency(uint256) external;
function getBuyTokenAmount(uint256, bool) external view returns (uint256);
function getSellTokenAmount(uint256, bool) external view returns (uint256);
function getBuyAndSellBuckets(bool) external view returns (uint256, uint256);
}
interface IReserve {
function setTobinTaxStalenessThreshold(uint256) external;
function addToken(address) external returns (bool);
function removeToken(address, uint256) external returns (bool);
function transferGold(address payable, uint256) external returns (bool);
function transferExchangeGold(address payable, uint256) external returns (bool);
function getReserveGoldBalance() external view returns (uint256);
function getUnfrozenReserveGoldBalance() external view returns (uint256);
function getOrComputeTobinTax() external returns (uint256, uint256);
function getTokens() external view returns (address[] memory);
function getReserveRatio() external view returns (uint256);
}
interface ISortedOracles {
function addOracle(address, address) external;
function removeOracle(address, address, uint256) external;
function report(address, uint256, address, address) external;
function removeExpiredReports(address, uint256) external;
function isOldestReportExpired(address token) external view returns (bool, address);
function numRates(address) external view returns (uint256);
function medianRate(address) external view returns (uint256, uint256);
function numTimestamps(address) external view returns (uint256);
function medianTimestamp(address) external view returns (uint256);
}
contract UsingRegistry is Ownable {
event RegistrySet(address indexed registryAddress);
bytes32 constant ACCOUNTS_REGISTRY_ID = keccak256(abi.encodePacked("Accounts"));
bytes32 constant ATTESTATIONS_REGISTRY_ID = keccak256(abi.encodePacked("Attestations"));
bytes32 constant DOWNTIME_SLASHER_REGISTRY_ID = keccak256(abi.encodePacked("DowntimeSlasher"));
bytes32 constant DOUBLE_SIGNING_SLASHER_REGISTRY_ID = keccak256(
abi.encodePacked("DoubleSigningSlasher")
);
bytes32 constant ELECTION_REGISTRY_ID = keccak256(abi.encodePacked("Election"));
bytes32 constant EXCHANGE_REGISTRY_ID = keccak256(abi.encodePacked("Exchange"));
bytes32 constant FEE_CURRENCY_WHITELIST_REGISTRY_ID = keccak256(
abi.encodePacked("FeeCurrencyWhitelist")
);
bytes32 constant FREEZER_REGISTRY_ID = keccak256(abi.encodePacked("Freezer"));
bytes32 constant GOLD_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("GoldToken"));
bytes32 constant GOVERNANCE_REGISTRY_ID = keccak256(abi.encodePacked("Governance"));
bytes32 constant GOVERNANCE_SLASHER_REGISTRY_ID = keccak256(
abi.encodePacked("GovernanceSlasher")
);
bytes32 constant LOCKED_GOLD_REGISTRY_ID = keccak256(abi.encodePacked("LockedGold"));
bytes32 constant RESERVE_REGISTRY_ID = keccak256(abi.encodePacked("Reserve"));
bytes32 constant RANDOM_REGISTRY_ID = keccak256(abi.encodePacked("Random"));
bytes32 constant SORTED_ORACLES_REGISTRY_ID = keccak256(abi.encodePacked("SortedOracles"));
bytes32 constant STABLE_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("StableToken"));
bytes32 constant VALIDATORS_REGISTRY_ID = keccak256(abi.encodePacked("Validators"));
IRegistry public registry;
modifier onlyRegisteredContract(bytes32 identifierHash) {
require(registry.getAddressForOrDie(identifierHash) == msg.sender, "only registered contract");
_;
}
modifier onlyRegisteredContracts(bytes32[] memory identifierHashes) {
require(registry.isOneOf(identifierHashes, msg.sender), "only registered contracts");
_;
}
function setRegistry(address registryAddress) public onlyOwner {
require(registryAddress != address(0), "Cannot register the null address");
registry = IRegistry(registryAddress);
emit RegistrySet(registryAddress);
}
function getAccounts() internal view returns (IAccounts) {
return IAccounts(registry.getAddressForOrDie(ACCOUNTS_REGISTRY_ID));
}
function getAttestations() internal view returns (IAttestations) {
return IAttestations(registry.getAddressForOrDie(ATTESTATIONS_REGISTRY_ID));
}
function getElection() internal view returns (IElection) {
return IElection(registry.getAddressForOrDie(ELECTION_REGISTRY_ID));
}
function getExchange() internal view returns (IExchange) {
return IExchange(registry.getAddressForOrDie(EXCHANGE_REGISTRY_ID));
}
function getFeeCurrencyWhitelistRegistry() internal view returns (IFeeCurrencyWhitelist) {
return IFeeCurrencyWhitelist(registry.getAddressForOrDie(FEE_CURRENCY_WHITELIST_REGISTRY_ID));
}
function getFreezer() internal view returns (IFreezer) {
return IFreezer(registry.getAddressForOrDie(FREEZER_REGISTRY_ID));
}
function getGoldToken() internal view returns (IERC20) {
return IERC20(registry.getAddressForOrDie(GOLD_TOKEN_REGISTRY_ID));
}
function getGovernance() internal view returns (IGovernance) {
return IGovernance(registry.getAddressForOrDie(GOVERNANCE_REGISTRY_ID));
}
function getLockedGold() internal view returns (ILockedGold) {
return ILockedGold(registry.getAddressForOrDie(LOCKED_GOLD_REGISTRY_ID));
}
function getRandom() internal view returns (IRandom) {
return IRandom(registry.getAddressForOrDie(RANDOM_REGISTRY_ID));
}
function getReserve() internal view returns (IReserve) {
return IReserve(registry.getAddressForOrDie(RESERVE_REGISTRY_ID));
}
function getSortedOracles() internal view returns (ISortedOracles) {
return ISortedOracles(registry.getAddressForOrDie(SORTED_ORACLES_REGISTRY_ID));
}
function getStableToken() internal view returns (IStableToken) {
return IStableToken(registry.getAddressForOrDie(STABLE_TOKEN_REGISTRY_ID));
}
function getValidators() internal view returns (IValidators) {
return IValidators(registry.getAddressForOrDie(VALIDATORS_REGISTRY_ID));
}
}
contract Freezable is UsingRegistry {
modifier onlyWhenNotFrozen() {
require(!getFreezer().isFrozen(address(this)), "can't call when contract is frozen");
_;
}
}
contract UsingPrecompiles {
using SafeMath for uint256;
address constant TRANSFER = address(0xff - 2);
address constant FRACTION_MUL = address(0xff - 3);
address constant PROOF_OF_POSSESSION = address(0xff - 4);
address constant GET_VALIDATOR = address(0xff - 5);
address constant NUMBER_VALIDATORS = address(0xff - 6);
address constant EPOCH_SIZE = address(0xff - 7);
address constant BLOCK_NUMBER_FROM_HEADER = address(0xff - 8);
address constant HASH_HEADER = address(0xff - 9);
address constant GET_PARENT_SEAL_BITMAP = address(0xff - 10);
address constant GET_VERIFIED_SEAL_BITMAP = address(0xff - 11);
function fractionMulExp(
uint256 aNumerator,
uint256 aDenominator,
uint256 bNumerator,
uint256 bDenominator,
uint256 exponent,
uint256 _decimals
) public view returns (uint256, uint256) {
require(aDenominator != 0 && bDenominator != 0, "a denominator is zero");
uint256 returnNumerator;
uint256 returnDenominator;
bool success;
bytes memory out;
(success, out) = FRACTION_MUL.staticcall(
abi.encodePacked(aNumerator, aDenominator, bNumerator, bDenominator, exponent, _decimals)
);
require(success, "error calling fractionMulExp precompile");
returnNumerator = getUint256FromBytes(out, 0);
returnDenominator = getUint256FromBytes(out, 32);
return (returnNumerator, returnDenominator);
}
function getEpochSize() public view returns (uint256) {
bytes memory out;
bool success;
(success, out) = EPOCH_SIZE.staticcall(abi.encodePacked());
require(success, "error calling getEpochSize precompile");
return getUint256FromBytes(out, 0);
}
function getEpochNumberOfBlock(uint256 blockNumber) public view returns (uint256) {
return epochNumberOfBlock(blockNumber, getEpochSize());
}
function getEpochNumber() public view returns (uint256) {
return getEpochNumberOfBlock(block.number);
}
function epochNumberOfBlock(uint256 blockNumber, uint256 epochSize)
internal
pure
returns (uint256)
{
uint256 epochNumber = blockNumber / epochSize;
if (blockNumber % epochSize == 0) {
return epochNumber;
} else {
return epochNumber + 1;
}
}
function validatorSignerAddressFromCurrentSet(uint256 index) public view returns (address) {
bytes memory out;
bool success;
(success, out) = GET_VALIDATOR.staticcall(abi.encodePacked(index, uint256(block.number)));
require(success, "error calling validatorSignerAddressFromCurrentSet precompile");
return address(getUint256FromBytes(out, 0));
}
function validatorSignerAddressFromSet(uint256 index, uint256 blockNumber)
public
view
returns (address)
{
bytes memory out;
bool success;
(success, out) = GET_VALIDATOR.staticcall(abi.encodePacked(index, blockNumber));
require(success, "error calling validatorSignerAddressFromSet precompile");
return address(getUint256FromBytes(out, 0));
}
function numberValidatorsInCurrentSet() public view returns (uint256) {
bytes memory out;
bool success;
(success, out) = NUMBER_VALIDATORS.staticcall(abi.encodePacked(uint256(block.number)));
require(success, "error calling numberValidatorsInCurrentSet precompile");
return getUint256FromBytes(out, 0);
}
function numberValidatorsInSet(uint256 blockNumber) public view returns (uint256) {
bytes memory out;
bool success;
(success, out) = NUMBER_VALIDATORS.staticcall(abi.encodePacked(blockNumber));
require(success, "error calling numberValidatorsInSet precompile");
return getUint256FromBytes(out, 0);
}
function checkProofOfPossession(address sender, bytes memory blsKey, bytes memory blsPop)
public
view
returns (bool)
{
bool success;
(success, ) = PROOF_OF_POSSESSION.staticcall(abi.encodePacked(sender, blsKey, blsPop));
return success;
}
function getBlockNumberFromHeader(bytes memory header) public view returns (uint256) {
bytes memory out;
bool success;
(success, out) = BLOCK_NUMBER_FROM_HEADER.staticcall(abi.encodePacked(header));
require(success, "error calling getBlockNumberFromHeader precompile");
return getUint256FromBytes(out, 0);
}
function hashHeader(bytes memory header) public view returns (bytes32) {
bytes memory out;
bool success;
(success, out) = HASH_HEADER.staticcall(abi.encodePacked(header));
require(success, "error calling hashHeader precompile");
return getBytes32FromBytes(out, 0);
}
function getParentSealBitmap(uint256 blockNumber) public view returns (bytes32) {
bytes memory out;
bool success;
(success, out) = GET_PARENT_SEAL_BITMAP.staticcall(abi.encodePacked(blockNumber));
require(success, "error calling getParentSealBitmap precompile");
return getBytes32FromBytes(out, 0);
}
function getVerifiedSealBitmapFromHeader(bytes memory header) public view returns (bytes32) {
bytes memory out;
bool success;
(success, out) = GET_VERIFIED_SEAL_BITMAP.staticcall(abi.encodePacked(header));
require(success, "error calling getVerifiedSealBitmapFromHeader precompile");
return getBytes32FromBytes(out, 0);
}
function getUint256FromBytes(bytes memory bs, uint256 start) internal pure returns (uint256) {
return uint256(getBytes32FromBytes(bs, start));
}
function getBytes32FromBytes(bytes memory bs, uint256 start) internal pure returns (bytes32) {
require(bs.length >= start + 32, "slicing out of range");
bytes32 x;
assembly {
x := mload(add(bs, add(start, 32)))
}
return x;
}
function minQuorumSize(uint256 blockNumber) public view returns (uint256) {
return numberValidatorsInSet(blockNumber).mul(2).add(2).div(3);
}
function minQuorumSizeInCurrentSet() public view returns (uint256) {
return minQuorumSize(block.number);
}
}
contract StableToken is
Ownable,
Initializable,
UsingRegistry,
UsingPrecompiles,
Freezable,
CalledByVm,
IStableToken,
IERC20,
ICeloToken
{
using FixidityLib for FixidityLib.Fraction;
using SafeMath for uint256;
event InflationFactorUpdated(uint256 factor, uint256 lastUpdated);
event InflationParametersUpdated(uint256 rate, uint256 updatePeriod, uint256 lastUpdated);
event Transfer(address indexed from, address indexed to, uint256 value);
event TransferComment(string comment);
string internal name_;
string internal symbol_;
uint8 internal decimals_;
mapping(address => uint256) internal balances;
uint256 internal totalSupply_;
mapping(address => mapping(address => uint256)) internal allowed;
struct InflationState {
FixidityLib.Fraction rate;
FixidityLib.Fraction factor;
uint256 updatePeriod;
uint256 factorLastUpdated;
}
InflationState inflationState;
modifier updateInflationFactor() {
FixidityLib.Fraction memory updatedInflationFactor;
uint256 lastUpdated;
(updatedInflationFactor, lastUpdated) = getUpdatedInflationFactor();
if (lastUpdated != inflationState.factorLastUpdated) {
inflationState.factor = updatedInflationFactor;
inflationState.factorLastUpdated = lastUpdated;
emit InflationFactorUpdated(inflationState.factor.unwrap(), inflationState.factorLastUpdated);
}
_;
}
function initialize(
string calldata _name,
string calldata _symbol,
uint8 _decimals,
address registryAddress,
uint256 inflationRate,
uint256 inflationFactorUpdatePeriod,
address[] calldata initialBalanceAddresses,
uint256[] calldata initialBalanceValues
) external initializer {
require(inflationRate != 0, "Must provide a non-zero inflation rate");
require(inflationFactorUpdatePeriod > 0, "inflationFactorUpdatePeriod must be > 0");
_transferOwnership(msg.sender);
totalSupply_ = 0;
name_ = _name;
symbol_ = _symbol;
decimals_ = _decimals;
inflationState.rate = FixidityLib.wrap(inflationRate);
inflationState.factor = FixidityLib.fixed1();
inflationState.updatePeriod = inflationFactorUpdatePeriod;
inflationState.factorLastUpdated = now;
require(initialBalanceAddresses.length == initialBalanceValues.length, "Array length mismatch");
for (uint256 i = 0; i < initialBalanceAddresses.length; i = i.add(1)) {
_mint(initialBalanceAddresses[i], initialBalanceValues[i]);
}
setRegistry(registryAddress);
}
function setInflationParameters(uint256 rate, uint256 updatePeriod)
external
onlyOwner
updateInflationFactor
{
require(rate != 0, "Must provide a non-zero inflation rate.");
require(updatePeriod > 0, "updatePeriod must be > 0");
inflationState.rate = FixidityLib.wrap(rate);
inflationState.updatePeriod = updatePeriod;
emit InflationParametersUpdated(
rate,
updatePeriod,
now
);
}
function increaseAllowance(address spender, uint256 value)
external
updateInflationFactor
returns (bool)
{
require(spender != address(0), "reserved address 0x0 cannot have allowance");
uint256 oldValue = allowed[msg.sender][spender];
uint256 newValue = oldValue.add(value);
allowed[msg.sender][spender] = newValue;
emit Approval(msg.sender, spender, newValue);
return true;
}
function decreaseAllowance(address spender, uint256 value)
external
updateInflationFactor
returns (bool)
{
uint256 oldValue = allowed[msg.sender][spender];
uint256 newValue = oldValue.sub(value);
allowed[msg.sender][spender] = newValue;
emit Approval(msg.sender, spender, newValue);
return true;
}
function approve(address spender, uint256 value) external updateInflationFactor returns (bool) {
require(spender != address(0), "reserved address 0x0 cannot have allowance");
allowed[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
function mint(address to, uint256 value) external updateInflationFactor returns (bool) {
require(
msg.sender == registry.getAddressFor(EXCHANGE_REGISTRY_ID) ||
msg.sender == registry.getAddressFor(VALIDATORS_REGISTRY_ID),
"Only the Exchange and Validators contracts are authorized to mint"
);
return _mint(to, value);
}
function _mint(address to, uint256 value) private returns (bool) {
require(to != address(0), "0 is a reserved address");
if (value == 0) {
return true;
}
uint256 units = _valueToUnits(inflationState.factor, value);
totalSupply_ = totalSupply_.add(units);
balances[to] = balances[to].add(units);
emit Transfer(address(0), to, value);
return true;
}
function transferWithComment(address to, uint256 value, string calldata comment)
external
updateInflationFactor
onlyWhenNotFrozen
returns (bool)
{
bool succeeded = transfer(to, value);
emit TransferComment(comment);
return succeeded;
}
function burn(uint256 value)
external
onlyRegisteredContract(EXCHANGE_REGISTRY_ID)
updateInflationFactor
returns (bool)
{
uint256 units = _valueToUnits(inflationState.factor, value);
require(units <= balances[msg.sender], "value exceeded balance of sender");
totalSupply_ = totalSupply_.sub(units);
balances[msg.sender] = balances[msg.sender].sub(units);
emit Transfer(msg.sender, address(0), units);
return true;
}
function transferFrom(address from, address to, uint256 value)
external
updateInflationFactor
onlyWhenNotFrozen
returns (bool)
{
uint256 units = _valueToUnits(inflationState.factor, value);
require(to != address(0), "transfer attempted to reserved address 0x0");
require(units <= balances[from], "transfer value exceeded balance of sender");
require(
value <= allowed[from][msg.sender],
"transfer value exceeded sender's allowance for recipient"
);
balances[to] = balances[to].add(units);
balances[from] = balances[from].sub(units);
allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);
emit Transfer(from, to, value);
return true;
}
function name() external view returns (string memory) {
return name_;
}
function symbol() external view returns (string memory) {
return symbol_;
}
function decimals() external view returns (uint8) {
return decimals_;
}
function allowance(address accountOwner, address spender) external view returns (uint256) {
return allowed[accountOwner][spender];
}
function balanceOf(address accountOwner) external view returns (uint256) {
return unitsToValue(balances[accountOwner]);
}
function totalSupply() external view returns (uint256) {
return unitsToValue(totalSupply_);
}
function getInflationParameters() external view returns (uint256, uint256, uint256, uint256) {
return (
inflationState.rate.unwrap(),
inflationState.factor.unwrap(),
inflationState.updatePeriod,
inflationState.factorLastUpdated
);
}
function valueToUnits(uint256 value) external view returns (uint256) {
FixidityLib.Fraction memory updatedInflationFactor;
(updatedInflationFactor, ) = getUpdatedInflationFactor();
return _valueToUnits(updatedInflationFactor, value);
}
function unitsToValue(uint256 units) public view returns (uint256) {
FixidityLib.Fraction memory updatedInflationFactor;
(updatedInflationFactor, ) = getUpdatedInflationFactor();
return FixidityLib.newFixed(units).divide(updatedInflationFactor).fromFixed();
}
function _valueToUnits(FixidityLib.Fraction memory inflationFactor, uint256 value)
private
pure
returns (uint256)
{
return inflationFactor.multiply(FixidityLib.newFixed(value)).fromFixed();
}
function getUpdatedInflationFactor() private view returns (FixidityLib.Fraction memory, uint256) {
if (now < inflationState.factorLastUpdated.add(inflationState.updatePeriod)) {
return (inflationState.factor, inflationState.factorLastUpdated);
}
uint256 numerator;
uint256 denominator;
uint256 timesToApplyInflation = now.sub(inflationState.factorLastUpdated).div(
inflationState.updatePeriod
);
(numerator, denominator) = fractionMulExp(
inflationState.factor.unwrap(),
FixidityLib.fixed1().unwrap(),
inflationState.rate.unwrap(),
FixidityLib.fixed1().unwrap(),
timesToApplyInflation,
decimals_
);
if (numerator == 0 || denominator == 0) {
return (inflationState.factor, inflationState.factorLastUpdated);
}
FixidityLib.Fraction memory currentInflationFactor = FixidityLib.wrap(numerator).divide(
FixidityLib.wrap(denominator)
);
uint256 lastUpdated = inflationState.factorLastUpdated.add(
inflationState.updatePeriod.mul(timesToApplyInflation)
);
return (currentInflationFactor, lastUpdated);
}
function transfer(address to, uint256 value)
public
updateInflationFactor
onlyWhenNotFrozen
returns (bool)
{
return _transfer(to, value);
}
function _transfer(address to, uint256 value) internal returns (bool) {
require(to != address(0), "transfer attempted to reserved address 0x0");
uint256 units = _valueToUnits(inflationState.factor, value);
require(balances[msg.sender] >= units, "transfer value exceeded balance of sender");
balances[msg.sender] = balances[msg.sender].sub(units);
balances[to] = balances[to].add(units);
emit Transfer(msg.sender, to, value);
return true;
}
function debitGasFees(address from, uint256 value)
external
onlyVm
onlyWhenNotFrozen
updateInflationFactor
{
uint256 units = _valueToUnits(inflationState.factor, value);
balances[from] = balances[from].sub(units);
totalSupply_ = totalSupply_.sub(units);
}
function creditGasFees(
address from,
address feeRecipient,
address gatewayFeeRecipient,
address communityFund,
uint256 refund,
uint256 tipTxFee,
uint256 gatewayFee,
uint256 baseTxFee
) external onlyVm onlyWhenNotFrozen {
uint256 units = _valueToUnits(inflationState.factor, refund);
balances[from] = balances[from].add(units);
units = units.add(_creditGas(from, communityFund, baseTxFee));
units = units.add(_creditGas(from, feeRecipient, tipTxFee));
units = units.add(_creditGas(from, gatewayFeeRecipient, gatewayFee));
totalSupply_ = totalSupply_.add(units);
}
function _creditGas(address from, address to, uint256 value) internal returns (uint256) {
if (to == address(0)) {
return 0;
}
uint256 units = _valueToUnits(inflationState.factor, value);
balances[to] = balances[to].add(units);
emit Transfer(from, to, value);
return units;
}
}

Contract ABI

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datePeriod"},{"type":"address[]","name":"initialBalanceAddresses"},{"type":"uint256[]","name":"initialBalanceValues"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"numberValidatorsInCurrentSet","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"getBlockNumberFromHeader","inputs":[{"type":"bytes","name":"header"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":""}],"name":"isOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":""}],"name":"symbol","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"getEpochNumber","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"numberValidatorsInSet","inputs":[{"type":"uint256","name":"blockNumber"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":""}],"name":"decreaseAllowance","inputs":[{"type":"address","name":"spender"},{"type":"uint256","name":"value"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""},{"type":"uint256","name":""},{"type":"uint256","name":""},{"type":"uint256","name":""}],"name":"getInflationParameters","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":""}],"name":"transfer","inputs":[{"type":"address","name":"to"},{"type":"uint256","name":"value"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setRegistry","inputs":[{"type":"address","name":"registryAddress"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"unitsToValue","inputs":[{"type":"uint256","name":"units"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"allowance","inputs":[{"type":"address","name":"accountOwner"},{"type":"address","name":"spender"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"getEpochSize","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":""}],"name":"transferWithComment","inputs":[{"type":"address","name":"to"},{"type":"uint256","name":"value"},{"type":"string","name":"comment"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"minQuorumSize","inputs":[{"type":"uint256","name":"blockNumber"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""},{"type":"uint256","name":""}],"name":"fractionMulExp","inputs":[{"type":"uint256","name":"aNumerator"},{"type":"uint256","name":"aDenominator"},{"type":"uint256","name":"bNumerator"},{"type":"uint256","name":"bDenominator"},{"type":"uint256","name":"exponent"},{"type":"uint256","name":"_decimals"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":""}],"name":"getParentSealBitmap","inputs":[{"type":"uint256","name":"blockNumber"}],"constant":true},{"type":"event","name":"InflationFactorUpdated","inputs":[{"type":"uint256","name":"factor","indexed":false},{"type":"uint256","name":"lastUpdated","indexed":false}],"anonymous":false},{"type":"event","name":"InflationParametersUpdated","inputs":[{"type":"uint256","name":"rate","indexed":false},{"type":"uint256","name":"updatePeriod","indexed":false},{"type":"uint256","name":"lastUpdated","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","indexed":true},{"type":"address","name":"to","indexed":true},{"type":"uint256","name":"value","indexed":false}],"anonymous":false},{"type":"event","name":"TransferComment","inputs":[{"type":"string","name":"comment","indexed":false}],"anonymous":false},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"owner","indexed":true},{"type":"address","name":"spender","indexed":true},{"type":"uint256","name":"value","indexed":false}],"anonymous":false},{"type":"event","name":"RegistrySet","inputs":[{"type":"address","name":"registryAddress","indexed":true}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","indexed":true},{"type":"address","name":"newOwner","indexed":true}],"anonymous":false}]
            

Deployed ByteCode

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