BitcoinsBest.com's Provably Fair Giveaway Manager (Run Honest Giveaways)

Enjoy this 100% free Giveaway Manager to help you run giveaways and pick a winner(s) in a 100% fair way.

https://bitcoinsbest.com/giveaway-manager.html

Make sure to bookmark it for future use. Wink

BitcoinsBest.com Giveaway Manager — Full FAQ (How It Works)
Provably fair • Future Bitcoin block hash • Public verification
Open the Giveaway Manager

Quick Summary

What it does: Runs a giveaway where the winner(s) are selected using a future Bitcoin block hash so nobody can “rig” the result ahead of time.
Why it’s fair: You lock in the participant list + target block height first, then the Bitcoin network produces the hash later.
How to verify: Anyone can reproduce the same result using the published inputs + the real block hash.

FAQ

1) What is the BitcoinsBest.com Giveaway Manager?
It’s a simple tool that helps you run provably fair Bitcoin-powered giveaways. Instead of using a random number generator that could be manipulated, it uses the hash of a future Bitcoin block as the randomness source.

2) What does “provably fair” mean here?
It means anyone can independently verify the giveaway outcome.
The organizer can’t change the result after the giveaway is started because the randomness (the future block hash) doesn’t exist yet when entries are locked.

3) Why use a “future” Bitcoin block hash?
Because it prevents manipulation:

You choose the target block height first (example: “next block”).
You publish the participants list and settings.
Only after the Bitcoin network mines that future block do we get the block hash.
That hash becomes the random seed used to pick winners.

Since the hash is unknown in advance, nobody can pre-calculate or “pick” a favorable outcome.

4) What inputs do I provide in the tool?

Competitors (one per line): each entry/username goes on its own line.
Number of Winners: choose 1–30 (or any number you set).
Target Bitcoin Block Height: the tool auto-fills the next block height by default.

5) What happens when I click “EXECUTE GIVEAWAY”?

The tool locks the inputs so the list can’t be edited.
It generates a shareable verification link immediately.
It shows: “Waiting for block hash — Winner coming soon!”
It then polls until the target block is mined and the hash becomes available.

6) How does the winner selection work (high level)?
After the target block is mined:

The tool reads the real block hash for the target height.
It converts the hash into a number (a deterministic “random” value).
It uses that number to select the winner index from the participant list.
For multiple winners, it repeats selection from the remaining pool (no duplicates).

Key point: the same inputs always produce the same winners.

7) Can the organizer cheat by changing the list?
Not if you do it correctly:

Post the participant list publicly (or use the shareable verification link) before the target block is mined.
Once that’s public, changing the list would be obvious because it would no longer match what you posted.

Can miners manipulate the block hash to force a certain winner?
In practice, it’s extremely unlikely for normal giveaways.
Mining a specific block hash outcome is not feasible for typical miners, and attempting to influence a block hash for a small giveaway would be economically irrational.

9) What is the “shareable verification link” and why is it important?
It’s a link that includes the giveaway settings (participants list, number of winners, block height) so anyone can open it later and see exactly what was locked in.
This is the best way to prove you didn’t change anything after the giveaway started.

10) How can anyone verify the result step-by-step?
Use this checklist:
[list=1]

Open the shared verification link (or copy the participant list + settings).
Confirm the target block height.
Look up the official block hash for that height (any Bitcoin block explorer).
Confirm the tool displays that same hash.
Confirm the winners match what the tool outputs for those exact inputs.

If the inputs and hash match, the result is verifiable.

11) What if the block height was already mined when the giveaway started?
For fairness, you should always use a future height (like the “next block” the tool autofills).
If you pick a past block, you could pre-calculate winners, which defeats the purpose.

12) What if the tool can’t fetch the next block height?
Sometimes an API endpoint may be temporarily unavailable. If that happens:

Refresh and try again, or
Manually set the target to current height + 1 (the next block).

13) How long does it take to get the block hash?
Bitcoin blocks are mined roughly every ~10 minutes on average, but it can be faster or slower. The tool shows a rough ETA while waiting.

14) Does the Giveaway Manager send Bitcoin or hold funds?
No. It’s a verification and selection tool.
You (the organizer) are responsible for sending prizes and posting proof of payment/transaction IDs if desired.

15) Best practices for running a transparent giveaway

Use a future block height (next block).
Post the share link publicly before the block is mined.
Clearly state prize amount, entry rules, and when winners will be announced.
After completion, post:

Target block height
Block hash
Winners list
(Optional) TXID(s) for prize payouts

[/list]

16) Safety note for participants
Never share your seed phrase/private keys. Real giveaways never require you to send crypto first to “claim” winnings.

Run your own provably fair giveaway here:
bitcoinsbest.com/giveaway-manager.html