Sources and limits

How a watch actually gets its facts

Each hour equals one pinned range of roughly 7,200 Arc blocks, resolved by binary search on the Arc JSON-RPC’s own block timestamps — Arc’s timestamps are non-decreasing, never strictly increasing, so no wall-clock label is trusted on its own. The chain backbone of every hour is the EIP-7708 USDC system-emitter Transfer log stream, filtered by emitter address, read in the block-range slices the RPC hands back (eth_getLogs caps at 2,000 results per query). This is a transfer stream, not a scrape of every transaction, and not the ERC-20 USDC contract’s own events, which miss native sends.

Data sources

Arc public JSON-RPC (block reads, log reads) · EIP-7708 system emitter (the factual backbone) · Blockscout (arc explorer, link only — its API answers a challenge page, not JSON, so it is never called programmatically here).

Known limits

A rota only exists for a project once someone claims its first hour; nothing is filled in automatically. Missing data is shown as missing, never guessed. This is a coordination record of public activity, not investment advice, and it never custodies funds.

Editorial policy

What a watch may say about a named person

Moderation is part of the floor, not an extra: every entry is queued for a human review pass, at most 24 a night, before it joins the permanent 24-hour record.

May report: what a named account did onchain, if it is cited to a block or transaction — sent, minted, bridged, deployed, listed, sold, provided liquidity, and so on.
May quote: a public, first-party statement (an X post, a public Discord message, a press release), if the watch names its source and time.
May not assert: a named person’s off-chain identity, motive, employment, wrongdoing, or private conduct, beyond what the chain itself or their own public statement in the same window shows.
May not repeat: unverified rumor, an allegation of fraud or scam without a block-level basis, or speculation about someone’s intent.
On violation: the entry is held at review and the watcher is asked to rewrite it before the next hour opens; it does not enter the record as written.

Contact

Method or policy question, or a correction to a published watch: reach the tower through the links in the site footer.