Watchtower
Checking system
Launch Watchtower
Base mainnet · read only

Watch the contract.
Verify the change.

Watchtower detects a configured Base upgrade, investigates it at exact historical blocks, and produces evidence you can independently verify.

Choose a monitored profile View investigations
  • No wallet required
  • Exact historical checks
  • Replayable receipts
ILLUSTRATIVE FLOWBase / 8453
EXAMPLECONFIGURED UPGRADE

Proxy implementation changed

Upgraded(address) · Base

Canonical sequenceINVESTIGATE
PRODUCT METAPHORNOT LIVE

Start an investigation

Choose a configured Base profile

Watchtower’s public MVP accepts only server-approved contracts and fixed historical checks.

MONITOR TARGETAave, Compound or ether.fiChoose profile
PROCESS01 Observe02 Plan03 Check04 Investigate05 Decide06 Verify

INVESTIGATE

Watchtower doesn’t stop at the event.

When a configured proxy emits an upgrade, Watchtower reconstructs the trigger, checks historical state, and binds the result into a deterministic receipt.

Open the evidence workspace
CONTRACT UPGRADE
CORROBORATED
01

Proxy implementation changed

The emitted implementation agrees with historical proxy state at the upgrade block.

Network
Base mainnet
Trigger
Upgraded(address)
Evidence
Complete
Checks
6 / 6 passed
  1. Observe triggertransaction + log
  2. Investigate follow-upsregistered checks only
  3. Verify receiptcanonical payload

MONITOR

Closed target registry

Choose the protocol to investigate.

Selection changes the evidence workspace. It never changes the approved address, event, calls, or historical blocks.

Only these registered profiles can be selected. Contract addresses and calls remain fixed server-side.

Operational workspace

Investigation overview

Three configured profiles. Three live-scan targets. Every result stays tied to evidence.

Verified fixture replay
Configured profiles03Base mainnet
Verified fixtures03Replayable
Live-scan targets03Server controlled
System stateRead onlyNo wallet or writes

Loading the verified fixture archive.

Observe

Preparing historical evidence

Loading the selected profile and checking its recorded upgrade event before building the evidence trace.

Read-only · configured Base profile

HOW IT WORKS

How Watchtower thinks

One signal.
Six bounded stages.

Each stage records what was requested, what was observed, and what could not be verified.

  1. 01

    Observe

    Verify the approved proxy event and its historical trigger evidence.

    EVENT
  2. 02

    Plan

    Select the immutable investigation plan registered for this profile.

    TRIGGER
  3. 03

    Check

    Read historical state at N−1 and N using the fixed, versioned plan.

    STATE
  4. 04

    Investigate

    Let the bounded agent choose approved follow-up check IDs while deterministic code controls every RPC parameter.

    EVIDENCE
  5. 05

    Decide

    Issue a deterministic corroborated, contradicted, or incomplete disposition.

    RESULT
  6. 06

    Verify

    Recompute the canonical receipt ID and open the underlying Base evidence.

    RECEIPT

RECEIPTS

Committed evidence

Every result comes with receipts.

Replay one verified upgrade fixture per configured profile. No synthetic activity.

Protocol Event Block and date Disposition Checks Receipt Action

VERIFY

Review packet

Verify an exported proof.

Choose a Watchtower review packet or portable integrity proof to verify it locally in this browser.

No upload, fetch, RPC call, or scan is performed.

Verification status

Waiting for a packet

Select an exported JSON packet to begin.

A valid result verifies the canonical receipt payload and its SHA-256 identifier. Packet metadata, narrative, links, and other fields outside that payload are not verified by the receipt hash.

EVIDENCE

The chain records the change.
Watchtower explains the proof.

VERIFIED FIXTURE · BASEUpgraded(address)

RECORDED

EXACT BLOCK TAGSHistorical checks

FIXED CHECKS

CANONICAL PAYLOADReceipt issued

REPLAYABLE

FAQ

Quick answers

A few common questions.

Quick answers about how Watchtower monitors, investigates and verifies onchain activity.

Still curious? Read the full documentation

Start with real evidence

Watch your first configured contract.

Select one of three approved Base profiles and replay its verified investigation.

Choose a profileExplore the workspace →