Public Decrypt Multiple Values

🟡 Intermediate | 🔓 Decryption

How to publicly reveal multiple encrypted values at once using batch 3-step decryption

Overview

This example demonstrates batch public decryption in FHEVM. Learn how to reveal multiple encrypted values (like lottery numbers or auction bids) at once using a single proof. More efficient than decrypting one value at a time. Shows the complete 3-step flow: batch request, batch off-chain decrypt, and single-proof finalization.

Quick Start

# Create new project from this template
npx labz create decryption-public-multiple my-project

# Navigate and install
cd my-project
npm install

# Run tests
npx hardhat test

Code Explanation

Store Multiple

Store 3 encrypted values with FHE.allowThis() for each. All values will be revealed together in the batch decryption flow.

Lines 83-105

Request Batch

STEP 1: Request public decryption for ALL values at once. Calls FHE.makePubliclyDecryptable() for each encrypted value.

Lines 109-124

Get All Handles

Get all encrypted handles in one call for off-chain batch decryption. STEP 2 uses these handles with relayer-sdk.

Lines 138-145

Finalize Batch

STEP 3: Finalize with single proof that verifies ALL values. One FHE.checkSignatures() call for all values is more efficient than separate calls.

Lines 156-181

Lottery Example

Real-world example: Lottery with 4 encrypted winning numbers. Shows how to batch reveal lottery results fairly.

Lines 185-244

FHE Operations Used

• FHE.fromExternal()

• FHE.allowThis()

• FHE.makePubliclyDecryptable()

• FHE.checkSignatures()

FHE Types Used

• euint64

• euint32

• externalEuint64

• externalEuint32

Tags

decryption public multiple batch lottery auction election reveal makePubliclyDecryptable checkSignatures

Related Examples

• decryption-public-single

• decryption-user-multiple

• lottery

Prerequisites

Before this example, you should understand:

• decryption-public-single

Next Steps

After this example, check out:

• lottery

• auction

• voting

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