BananaTap · Provably Fair

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Seeds are revealed after the day ends (UTC). Pick a past day, paste the wallet, and either list its taps or check one tap number.

Day (UTC) Wallet Tap number (1 = first tap of the day) List taps that day Verify this tap

1. Daily seed. At 00:00 UTC the server draws 32 random bytes, seed, and publishes commit = SHA-256(seed). The seed stays secret until the day is over.
2. Your tap's seed. Your n-th tap of the day uses tapSeed = HMAC-SHA256(key = seed, message = "tap:<wallet>:<day>:<n>").
3. Random stream. Block i = SHA-256(tapSeed || i) (i as a 4-byte big-endian integer, i = 0, 1, 2…), read as unsigned 32-bit big-endian integers. nextInt(n) rejects values ≥ 2³² − (2³² mod n) and returns v mod n; nextFloat() is v / 2³².
4. The result, in this order: nothing = nextFloat() < 0.40; roll = nextInt(100000) → rarity table; xpRoll = nextInt(100) → XP table. If nothing is true the rarity roll is ignored. The banana's looks come from the same stream afterwards (re-rolled only if its DNA already exists; rarity never changes).

Roll (of 100,000)	Rarity	Roll (of 100)	Pass XP
0 – 54,999	Common	0 – 49	+5
55,000 – 79,999	Uncommon	50 – 79	+10
80,000 – 91,999	Rare	80 – 94	+20
92,000 – 97,499	Epic	95 – 99	+50 (crit)
97,500 – 99,499	Ultra Rare
99,500 – 99,899	Legendary
99,900 – 99,989	Mythic
99,990 – 99,999	Cosmic

Tap XP is capped at 110 a day and Elite Pass holders get +10%; both apply after the roll. You can redo every step with any SHA-256 / HMAC library. Raw data: /fair/<day>, /fair/taps?day=&wallet=, /fair/verify?day=&wallet=&idx=.

• The seed was fixed before anyone tapped: SHA-256(seed) must equal the commitment published that morning.
• Nothing was changed afterwards: the seed, your wallet and the tap number fully determine the result.
• The odds are the ones in the app: the tables above are the only tables.

If a day's seed is ever missing after that day, treat it as a broken promise.