High-Precision Timestamp

High-Precision Timestamp system contract — sub-second timestamp oracle service backed by Oracle storage.

This page specifies the High-Precision Timestamp system contract. It defines the address, interface, storage layout within the Oracle contract, and the per-transaction snapshot semantics.

Motivation

EVM's block.timestamp has second-level granularity. MegaETH produces blocks at sub-second intervals, so multiple blocks may share the same block.timestamp. Contracts that depend on time ordering (e.g., auction deadlines, TWAP calculations) need a higher-resolution timestamp.

The High-Precision Timestamp contract provides a microsecond-resolution timestamp backed by Oracle storage, updated per transaction by the sequencer.

Specification

Address

The High-Precision Timestamp contract MUST exist at HIGH_PRECISION_TIMESTAMP_ADDRESS.

Interface

The contract MUST expose the following interface:

interface IHighPrecisionTimestamp {
    function timestamp() external view returns (uint256);
    function update(uint256 index) external;
    function oracle() external view returns (address);
    function baseSlot() external view returns (uint256);
    function maxSlots() external view returns (uint32);
}

oracle() MUST return ORACLE_CONTRACT_ADDRESS. baseSlot() MUST return TIMESTAMP_BASE_SLOT. maxSlots() MUST return TIMESTAMP_MAX_SLOTS.

The timestamp() method MUST return the value stored at Oracle slot TIMESTAMP_BASE_SLOT, interpreted as a uint256 number of microseconds since Unix epoch.

Storage Layout

The timestamp service allocation within Oracle storage MUST be:

Slot Range	Meaning
0	Current high-precision timestamp in microseconds
1–7	Reserved for future use

Service Semantics

For each user transaction that accesses timestamp-backed Oracle data, the sequencer MUST provide a per-transaction snapshot of the timestamp service. That snapshot value MUST be written to Oracle storage via a Mega System Transaction before the corresponding user transaction in the final block ordering.

If a transaction does not access timestamp-backed Oracle data, the protocol MUST NOT require a timestamp-service write for that transaction.

The timestamp service MUST satisfy the following guarantees:

• the value is expressed in microseconds,

• the value is capped above by block.timestamp × 1,000,000,

• successive transactions within a block observe non-decreasing timestamp values,

• and each transaction observes a stable per-transaction snapshot.

Constants

Constant	Value	Description
HIGH_PRECISION_TIMESTAMP_ADDRESS	0x6342000000000000000000000000000000000002	Stable high-precision timestamp wrapper address
TIMESTAMP_BASE_SLOT	0	Oracle storage base slot for the timestamp service
TIMESTAMP_MAX_SLOTS	8	Number of Oracle slots reserved for the timestamp service

Rationale

Why a separate contract instead of reading Oracle storage directly? The wrapper's address, interface, and storage mapping are part of MegaETH's verifiable behavior. Nodes and contracts must agree on how the timestamp service is exposed, not only on the existence of underlying Oracle storage.

Why microsecond resolution? Microseconds provide sufficient granularity for sub-second block intervals while fitting in a single uint256 slot.

Spec History

• MiniRex introduced the High-Precision Timestamp contract.