storeCommitmentOnChain

Stores a generated ZK commitment hash (commitment) and associated metadata (metadata) onto the Solana blockchain via a transaction. This is typically used to timestamp the moment the data was "committed".

The function utilizes Solana's Memo Program (spl-memo) to package the commitment and metadata into a transaction instruction, signs it, and sends it to the network.

Parameters

Parameter	Type	Description
privateKeyBase58	const String&	The private key of the wallet signing and paying for the transaction.
fromPubkeyBase58	const String&	The public key of the sender's wallet.
commitment	const String&	The commitment hash (usually hex format) to be stored on-chain.
metadata	const String&	Additional descriptive data to accompany the commitment (e.g., "device_id:123").
outTxSignature	String&	Output: If successful, returns the transaction signature.

Return Value

• bool: Returns true if the transaction was sent and confirmed successfully, false otherwise.

Example Code (main.cpp)

#include <Arduino.h>
#include <WiFi.h>
#include "Infratic-lib.h"

// --- WiFi Settings ---
const char* WIFI_SSID = "YOUR_WIFI_SSID";
const char* WIFI_PASSWORD = "YOUR_WIFI_PASSWORD";

// --- Solana Settings ---
const String SOLANA_RPC_URL = "[https://api.devnet.solana.com](https://api.devnet.solana.com)";
const String MY_PRIVATE_KEY_BASE58 = "YOUR_PRIVATE_KEY_BASE58"; // Your Devnet wallet
const String MY_PUBLIC_KEY_BASE58 = "YOUR_PUBLIC_KEY_BASE58";

Infratic solana(SOLANA_RPC_URL);

void setup() {
    Serial.begin(115200);
    delay(1000);

    // Connect to WiFi
    Serial.print("Connecting to WiFi...");
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\n✅ WiFi connected!");

    Serial.println("\n=== storeCommitmentOnChain Example ===");

    // Assume this commitment came from createDataCommitment
    String commitmentToStore = "2b9a7a59d6f0d36f5e8d9c12b4c7d0a3a1b2c3d4e5f67890a1b2c3d4e5f67890";
    String metadata = "device:ESP32-A1,type:temp_commit";
    String txSignature;

    Serial.println("Sending commitment to the blockchain...");
    if (solana.storeCommitmentOnChain(MY_PRIVATE_KEY_BASE58, MY_PUBLIC_KEY_BASE58, commitmentToStore, metadata, txSignature)) {
        Serial.println("✅ Commitment successfully stored on-chain!");
        Serial.println("   -> Transaction Signature: " + txSignature);
        Serial.println("   -> You can check it on Solana Explorer.");
    } else {
        Serial.println("❌ Failed to store commitment on-chain.");
    }
}

void loop() {
    // Can be left empty
}