> ## Documentation Index
> Fetch the complete documentation index at: https://companyname-a7d5b98e-nft-comparison.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Airdrop

export const Image = ({src, darkSrc, alt = "", darkAlt, href, target, height = 342, width = 608}) => {
  const isSVG = src.match(/\.svg(?:[#?].*?)?$/i) !== null;
  const shouldInvert = isSVG && !darkSrc;
  const shouldCreateLink = href !== undefined;
  const minPx = 9;
  const maxPx = 608;
  const expectedPx = `a number or a string with a number that is greater than ${minPx - 1} and less than or equal to ${maxPx}`;
  const createInvalidPropCallout = (title, received, expected) => {
    return <Danger>
        <span className="font-bold">
          Invalid <code>{title.toString()}</code> passed!
        </span>
        <br />
        <span className="font-bold">Received: </span>
        {received.toString()}
        <br />
        <span className="font-bold">Expected: </span>
        {expected.toString()}
        {}
      </Danger>;
  };
  const checkValidDimensionValue = value => {
    switch (typeof value) {
      case "string":
      case "number":
        const num = Number(value);
        return Number.isSafeInteger(num) && num >= minPx && num <= maxPx;
      default:
        return false;
    }
  };
  let callouts = [];
  if (height && !checkValidDimensionValue(height)) {
    callouts.push(createInvalidPropCallout("height", height, expectedPx));
  }
  if (width && !checkValidDimensionValue(width)) {
    callouts.push(createInvalidPropCallout("width", width, expectedPx));
  }
  if (callouts.length !== 0) {
    return callouts;
  }
  const heightPx = Number(height);
  const widthPx = Number(width);
  const images = <>
      <img className="block dark:hidden" src={src} alt={alt} {...height && ({
    height: heightPx
  })} {...width && ({
    width: widthPx
  })} {...(shouldCreateLink || shouldInvert) && ({
    noZoom: "true"
  })} />
      <img className={`hidden dark:block ${shouldInvert ? "invert" : ""}`} src={darkSrc ?? src} alt={darkAlt ?? alt} {...height && ({
    height: heightPx
  })} {...width && ({
    width: widthPx
  })} {...(shouldCreateLink || shouldInvert) && ({
    noZoom: "true"
  })} />
    </>;
  if (shouldCreateLink) {
    return <a href={href} target={target ?? "_self"}>
        {images}
      </a>;
  }
  return images;
};

export const Aside = ({type = "note", title = "", icon = "", iconType = "regular", children}) => {
  const asideVariants = ["note", "tip", "caution", "danger"];
  const asideComponents = {
    note: {
      outerStyle: "border-sky-500/20 bg-sky-50/50 dark:border-sky-500/30 dark:bg-sky-500/10",
      innerStyle: "text-sky-900 dark:text-sky-200",
      calloutType: "note",
      icon: <svg width="14" height="14" viewBox="0 0 14 14" fill="currentColor" xmlns="http://www.w3.org/2000/svg" className="w-4 h-4 text-sky-500" aria-label="Note">
          <path fill-rule="evenodd" clip-rule="evenodd" d="M7 1.3C10.14 1.3 12.7 3.86 12.7 7C12.7 10.14 10.14 12.7 7 12.7C5.48908 12.6974 4.0408 12.096 2.97241 11.0276C1.90403 9.9592 1.30264 8.51092 1.3 7C1.3 3.86 3.86 1.3 7 1.3ZM7 0C3.14 0 0 3.14 0 7C0 10.86 3.14 14 7 14C10.86 14 14 10.86 14 7C14 3.14 10.86 0 7 0ZM8 3H6V8H8V3ZM8 9H6V11H8V9Z"></path>
        </svg>
    },
    tip: {
      outerStyle: "border-emerald-500/20 bg-emerald-50/50 dark:border-emerald-500/30 dark:bg-emerald-500/10",
      innerStyle: "text-emerald-900 dark:text-emerald-200",
      calloutType: "tip",
      icon: <svg width="11" height="14" viewBox="0 0 11 14" fill="currentColor" xmlns="http://www.w3.org/2000/svg" className="text-emerald-600 dark:text-emerald-400/80 w-3.5 h-auto" aria-label="Tip">
          <path d="M3.12794 12.4232C3.12794 12.5954 3.1776 12.7634 3.27244 12.907L3.74114 13.6095C3.88471 13.8248 4.21067 14 4.46964 14H6.15606C6.41415 14 6.74017 13.825 6.88373 13.6095L7.3508 12.9073C7.43114 12.7859 7.49705 12.569 7.49705 12.4232L7.50055 11.3513H3.12521L3.12794 12.4232ZM5.31288 0C2.52414 0.00875889 0.5 2.26889 0.5 4.78826C0.5 6.00188 0.949566 7.10829 1.69119 7.95492C2.14321 8.47011 2.84901 9.54727 3.11919 10.4557C3.12005 10.4625 3.12175 10.4698 3.12261 10.4771H7.50342C7.50427 10.4698 7.50598 10.463 7.50684 10.4557C7.77688 9.54727 8.48281 8.47011 8.93484 7.95492C9.67728 7.13181 10.1258 6.02703 10.1258 4.78826C10.1258 2.15486 7.9709 0.000106649 5.31288 0ZM7.94902 7.11267C7.52078 7.60079 6.99082 8.37878 6.6077 9.18794H4.02051C3.63739 8.37878 3.10743 7.60079 2.67947 7.11294C2.11997 6.47551 1.8126 5.63599 1.8126 4.78826C1.8126 3.09829 3.12794 1.31944 5.28827 1.3126C7.2435 1.3126 8.81315 2.88226 8.81315 4.78826C8.81315 5.63599 8.50688 6.47551 7.94902 7.11267ZM4.87534 2.18767C3.66939 2.18767 2.68767 3.16939 2.68767 4.37534C2.68767 4.61719 2.88336 4.81288 3.12521 4.81288C3.36705 4.81288 3.56274 4.61599 3.56274 4.37534C3.56274 3.6515 4.1515 3.06274 4.87534 3.06274C5.11719 3.06274 5.31288 2.86727 5.31288 2.62548C5.31288 2.38369 5.11599 2.18767 4.87534 2.18767Z"></path>
        </svg>
    },
    caution: {
      outerStyle: "border-amber-500/20 bg-amber-50/50 dark:border-amber-500/30 dark:bg-amber-500/10",
      innerStyle: "text-amber-900 dark:text-amber-200",
      calloutType: "warning",
      icon: <svg className="flex-none w-5 h-5 text-amber-400 dark:text-amber-300/80" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2" aria-label="Warning">
          <path stroke-linecap="round" stroke-linejoin="round" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z"></path>
        </svg>
    },
    danger: {
      outerStyle: "border-red-500/20 bg-red-50/50 dark:border-red-500/30 dark:bg-red-500/10",
      innerStyle: "text-red-900 dark:text-red-200",
      calloutType: "danger",
      icon: <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" fill="currentColor" className="text-red-600 dark:text-red-400/80 w-4 h-4" aria-label="Danger">
          <path d="M17.1 292c-12.9-22.3-12.9-49.7 0-72L105.4 67.1c12.9-22.3 36.6-36 62.4-36l176.6 0c25.7 0 49.5 13.7 62.4 36L494.9 220c12.9 22.3 12.9 49.7 0 72L406.6 444.9c-12.9 22.3-36.6 36-62.4 36l-176.6 0c-25.7 0-49.5-13.7-62.4-36L17.1 292zm41.6-48c-4.3 7.4-4.3 16.6 0 24l88.3 152.9c4.3 7.4 12.2 12 20.8 12l176.6 0c8.6 0 16.5-4.6 20.8-12L453.4 268c4.3-7.4 4.3-16.6 0-24L365.1 91.1c-4.3-7.4-12.2-12-20.8-12l-176.6 0c-8.6 0-16.5 4.6-20.8 12L58.6 244zM256 128c13.3 0 24 10.7 24 24l0 112c0 13.3-10.7 24-24 24s-24-10.7-24-24l0-112c0-13.3 10.7-24 24-24zM224 352a32 32 0 1 1 64 0 32 32 0 1 1 -64 0z"></path>
        </svg>
    }
  };
  let variant = type;
  let gotInvalidVariant = false;
  if (!asideVariants.includes(type)) {
    gotInvalidVariant = true;
    variant = "danger";
  }
  const iconVariants = ["regular", "solid", "light", "thin", "sharp-solid", "duotone", "brands"];
  if (!iconVariants.includes(iconType)) {
    iconType = "regular";
  }
  return <>
      <div className={`callout my-4 px-5 py-4 overflow-hidden rounded-2xl flex gap-3 border ${asideComponents[variant].outerStyle}`} data-callout-type={asideComponents[variant].calloutType}>
        <div className="mt-0.5 w-4" data-component-part="callout-icon">
          {}
          {icon === "" ? asideComponents[variant].icon : <Icon icon={icon} iconType={iconType} size={14} />}
        </div>
        <div className={`text-sm prose min-w-0 w-full ${asideComponents[variant].innerStyle}`} data-component-part="callout-content">
          {gotInvalidVariant ? <p>
              <span className="font-bold">
                Invalid <code>type</code> passed!
              </span>
              <br />
              <span className="font-bold">Received: </span>
              {type}
              <br />
              <span className="font-bold">Expected one of: </span>
              {asideVariants.join(", ")}
            </p> : <>
              {title && <p className="font-bold">{title}</p>}
              {children}
            </>}
        </div>
      </div>
    </>;
};

## The problem: distributing at scale

You want to reward thousands (or millions) of users. Sending assets to each address proactively looks simple-until you see the bill. Network fees add up fast when the sender pays for every transfer.

## The twist: let users claim

An airdrop flips the model. Instead of the distributor paying all fees, each eligible user claims their allocation and covers the network fees themselves.

The straightforward approach is to keep a precomputed mapping of recipient → allocation in the contract. When a user sends a claim message, the contract releases the preassigned drop for that user.

<Image src="/resources/images/claim_light.svg" darkSrc="/resources/images/claim_dark.svg" alt="claim" />

## The naive approach-and its limit

Keep a precomputed mapping of recipient → allocation in the contract. When a user sends a claim message, the contract releases the preassigned amount. This works until the list becomes too large, starting at roughly 3,000 entries, problems begin to surface with the external limit (see more in [limits](/foundations/limits#message-and-transaction-limits)).

## The scalable design: shard and prove

To scale, we split the state across many contracts ([contract sharding](/contract-dev/contract-sharding)) and keep only a compact commitment to the list on-chain: a root hash of a dictionary (see [hashmap](/languages/tl-b/complex-and-non-trivial-examples#hashmap)). Users then present a [Merkle proof](/foundations/proofs/overview) to claim.

We must also prevent double-claims. The airdrop has a small per-user marker contract that records whether the user has already claimed. This marker blocks any subsequent attempts.

<Aside>
  Why not simply update the Merkle root with each claim?

  With many users, several claims are likely to arrive concurrently. After the first update, all other in-flight proofs become stale, causing many transactions to fail.
</Aside>

## How to prepare

1. Prepare a list of eligible recipients and their allocations, and construct a dictionary.
2. Store the root hash in the airdrop contract.
3. Provide each user with their [Merkle proof](/foundations/proofs/overview) (or enable self-service proof retrieval).

## Claim flow

1. The user sends a message that deploys their per-user marker contract along with their Merkle proof.
2. If valid, the marker records that the claim has been made and rejects further requests.
3. The airdrop contract verifies the [Merkle proof](/foundations/proofs/overview) and transfers the asset to the address specified in the proof.

<Image src="/resources/images/merkle_claim_light.svg" darkSrc="/resources/images/merkle_claim_dark.svg" alt="Merkle claim" />

## Examples

* cNFT
* [Mintless Jetton](/standard/tokens/jettons/mintless/overview)