Cointiply

How the game works

Each round has up to 11 levels. Level 1 has a 68.7% win chance; Levels 2–11 each have a 66.7% win chance (≈2 in 3). Multipliers increase as you advance—up to 61.3×.

Cointiply’s house edge is ~3.75% on the first two levels. We pay 0.25% of every bet to referrers, bringing the effective house edge to ~3.5%.

Odds & multipliers by level

A random number from 0–99,999 is generated when you tap a target. Hitting the level’s winning range pays the listed multiplier.

Example: On Level 1, any number from 0–68,764 wins and pays 1.4×.

Provably fair—what that means

• Two seeds + nonce: Every roll uses a server seed, your client seed, and a nonce (the roll count for that seed pair).
• Pre-commitment: The server seed is created before you choose your client seed, preventing bias.
• Daily reveal: We reveal the server seed daily (UTC) so you can verify all rolls produced with it.

Roll generation (technical)

We compute hmac-sha512(server_seed, client_seed-nonce) and parse the hex output in 5-char chunks to derive a number:

• Convert the first 5 hex chars to a number in 0–1,048,575. If > 999,999, skip to the next 5 chars and repeat until ≤ 999,999.
• Apply mod 100,000 to get the final roll in 0–99,999.

Where to find & copy seeds in CointiPlay

• Desktop: Open CointiPlay → History, click a round, then expand Details to see Server Seed (revealed), Client Seed, and Nonce. Click the copy icon next to each value.
• Mobile app: Menu → CointiPlay → History → tap a round → Details. Long-press a seed to copy, or tap the copy icon where available.
• Change client seed: In the CointiPlay menu, tap the Settings (gear) icon → Client Seed → update → Save. (This resets the nonce.)

Verifying fairness

• Find the server seed (revealed), your client seed, and the nonce in your CointiPlay history.
• Use any standard HMAC-SHA512 dice verifier to reproduce the roll sequence. Some tools display 0–99.99 (dropping a digit); they still validate the trailing digits, which is sufficient to confirm fairness.

If a verifier truncates one digit, the final four digits still cryptographically match—enough to prove no tampering.