A cryptographic commit-reveal protocol is a two-phase drawing method that makes the outcome provably fair: the draw algorithm commits to a result before entry data is finalized, then reveals that result publicly with mathematical proof that no tampering occurred. This approach eliminates the possibility of manipulation by platform operators, charities, or any third party.
Key takeaways:
- Commit-reveal separates the random selection moment from the reveal moment, preventing anyone from knowing entries when the outcome is determined
- Every step generates verifiable cryptographic hashes that participants can independently audit
- The Daily Deed publishes all draw inputs, outputs, and verification code on the verified draws page for every campaign
- Unlike manual drawings or closed systems, commit-reveal provides mathematical proof of fairness, not just trust
What is a commit-reveal protocol?
A commit-reveal protocol is a cryptographic drawing method in two distinct phases: first, the system generates and publicly commits to a random value (the "commit" phase) before final entry data exists; second, after entries close, the system combines that committed value with entry data to produce the winner (the "reveal" phase). This separation makes it mathematically impossible to manipulate outcomes because the randomness is locked in before anyone knows the final participant list.
The commit phase typically involves generating a random seed and publishing its cryptographic hash—a one-way mathematical fingerprint. The hash proves the seed existed at that moment without revealing its value. According to The Daily Deed's implementation, this commit happens before the campaign's entry deadline, creating an immutable anchor point.
How does The Daily Deed use commit-reveal for transparent drawing?
The Daily Deed executes a provably fair draw for every charity prize giveaway using a strict commit-reveal sequence. Before entries close, the platform generates a random server seed and publishes its SHA-256 hash to the blockchain, creating a tamper-proof timestamp. After the entry period ends, The Daily Deed combines this server seed with the final entry manifest and a client seed (often from a public entropy source like Bitcoin block hashes) to produce the winner index through a deterministic algorithm.
Every participant can verify the outcome by reviewing the published draw data. The verification process confirms: (1) the revealed server seed matches the pre-committed hash, (2) the entry list is complete and matches the campaign record, (3) the deterministic algorithm produces the same winner index when run independently. The Daily Deed publishes the full verification code openly so anyone with basic programming knowledge can re-run the draw.
This approach contrasts sharply with opaque systems that ask participants to simply trust the operator's claim of randomness.
Why is commit-reveal better than other drawing methods?
Commit-reveal protocols provide mathematical proof of fairness that manual drawings and closed random-number generators cannot match. A physical drawing can be influenced by timing, container design, or sleight of hand. A proprietary "black box" random selector requires participants to trust the operator's integrity and the secrecy of the code. The Federal Trade Commission has emphasized transparency in promotional drawings as a consumer protection measure.
Cryptographic commit-reveal eliminates trust as a requirement. The math itself guarantees the outcome was determined fairly. If anyone attempts to manipulate the server seed after seeing entries, the revealed seed will fail the hash verification. If anyone tries to alter the entry list, participants can compare it against their own receipts and donation records.
For charity prize giveaways on The Daily Deed, this transparency protects both donors and the Sponsor Charity's reputation. Verified integrity strengthens donor confidence and demonstrates the nonprofit's commitment to ethical operations.
Can participants verify a commit-reveal draw themselves?
Yes—any participant can independently verify a commit-reveal draw using publicly available data and open-source tools. The Daily Deed publishes five critical pieces of information for every completed draw: the pre-committed hash with its timestamp, the revealed server seed, the complete entry manifest, the client seed source, and the winner selection algorithm. These components allow full reconstruction of the drawing.
Verification requires checking that the server seed hashes to the pre-committed value (confirming no post-facto manipulation), that the entry list is accurate, and that running the algorithm with these inputs produces the announced winner. The Daily Deed provides step-by-step instructions and sample code on the verified draws page. No specialized cryptography knowledge is required—basic familiarity with hash functions and command-line tools is sufficient.
Third-party auditors and watchdog organizations can also verify draws retroactively. This open auditability builds confidence across all stakeholders: donors know their entries were counted fairly, charities can demonstrate transparent drawing to state regulators, and the broader public can assess the platform's integrity.
How does this apply to free entry?
Commit-reveal protocols treat every entry identically, whether obtained through donation or free entry methods. Each entry receives a sequential index in the manifest before the drawing algorithm runs. The algorithm selects a winner based on the cryptographic inputs and deterministic math—it has no knowledge of which entries came from donations versus free methods.
This technical equality ensures compliance with laws governing prize giveaways and upholds fairness principles. Free entry carries the same odds per entry as donation entries. The provably fair nature of commit-reveal provides mathematical assurance that entry source plays no role in winner selection.
Frequently Asked Questions
What happens if someone claims the draw was rigged?
Anyone making that claim can verify the draw themselves using the published data. If the verification steps confirm the hash matches, the entry list is accurate, and the algorithm produces the announced winner, the claim is mathematically disprovable. The Daily Deed's open verification approach turns accusations into checkable facts.
Does commit-reveal require special software to participate?
No. Participants donate to a verified charity and receive giveaway entries through the standard campaign pages—the cryptographic protocol runs in the background. Only those who wish to independently verify the draw need to review the technical data, and The Daily Deed provides all necessary tools and instructions.
Are commit-reveal draws legally compliant?
Commit-reveal is a drawing method, not a legal framework. Compliance with state prize promotion laws depends on campaign structure, free entry availability, registration, and bonding—factors the Sponsor Charity manages with its counsel. The transparent drawing method supports compliance by providing auditable proof of fair winner selection. Always consult qualified legal counsel for compliance questions.