> For the complete documentation index, see [llms.txt](https://docs.startrail.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.startrail.io/startrail-sdk-js/startrail-api-methods/createsrr.md).

# Create SRR

## `createSRR()`

Issue a new SRR on Startrail. Sends a transaction to Startrail smart contract via Startrail-API.

{% hint style="info" %}
Please call convertMetadata() in prior and replace with the converted metadata in order to keep the metadata always up to date [`convertMetadata()`](/startrail-sdk-js/startrail-api-methods/convertmetadata.md)
{% endhint %}

## Method parameters

| Variable                      | Type      | Description                                                                                                           |
| ----------------------------- | --------- | --------------------------------------------------------------------------------------------------------------------- |
| `startrailLUWContractAddress` | `string`  | The address of LicensedUserWallet(LUW) contract.                                                                      |
| `contractAddress`             | `string`  | The address of collection contract. Sets it when you want to associate collection contract address with the SRR.      |
| `isPrimaryIssuer`             | `boolean` | If you are the primary issuer of this NFT, set this to true                                                           |
| `artistAddress`               | `string`  | The ethereum address of the artist of the artwork.                                                                    |
| `metadata`                    | `object`  | Refer to the [Startrail Registry (SRR) data schema](/metadata-schema/startrail-registry-srr.md) for all possible data |
| `lockExternalTransfer`        | `boolean` | If you want to prevent your NFTs to be transferred on decentralized marketplaces, sets this to true                   |

### Parameters Example

```
await sdk.approveSRRByCommitment(
  {  
    startrailLUWContractAddress: '0x113c6880fc4a2664E125973BC0Dfd37d62Ec7c3f',
    isPrimaryIssuer: true,
    artistAddress: '0x4a2B3Ca3c9C96898d1000137521427e9f4fdD019',
    lockExternalTransfer: false,
    metadata: {
      $schema: "ipfs://bafkreif77ionobe56gawqnplet46x3sjfinx3krm4reldzn7v6c2nfrmy4",
      startbahnCertICTagUIDs: [
        "1234567890abcdef"
      ],
      chipUIDs: [
        "1234567890abcdef"
      ],
      title: {
        en: "A title",
        ja: "タイトル",
        zh: "一个标题"
      },
      size: {
        width: 200.0,
        height: 400.0,
        depth: 12.4,
        unit: "pixel",
        flexibleDescription: {
          en: "flexibleDescription comes here",
          ja: "説明を入力"
        }
      },
      attributes: [
        {
          trait_type: "Mouth",
          value: "Surprised"
        }
      ],
      medium: {
        en: "Oil on canvas",
        ja: "キャンバスに油彩",
        zh: "布面油画"
      },
      edition: {
        uniqueness: "unique work",
        proofType: "ED",
        number: 1,
        totalNumber: 3,
        note: {
          en: "some extra notes in 1 or more languages"
        }
      },
      contractTerms: {
        royaltyRate: 15.7,
        fileURL: "ipfs://bafkreihmlsij6s5ri6e347h7yqjlsl4qa3iykub6qmumctb2mshc4u7vlm"
      },
      note: {
        en: "note",
        zh: "注意"
      },
      thumbnailURL: "ipfs://bafkreiedkaf4w5ogbbnfgp4jyrlvdqmwh3edryszcciee3puyn7nltcomi",
      yearOfCreation: {
        en: "around 2010-2020",
        ja: "2010年から2020年頃"
      },
      isDigital: true,
      digitalDataHash: "sha256-247e4b904322a1dd0b148cd77e8627ec7d391251380880ab4621726ecb945ef5",
      digitalComponents: [{
        hash: "sha256-247e4b904322a1dd0b148cd77e8627ec7d391251380880ab4621726ecb945ef5",
        category: "artwork"
      }],
      attachmentFiles: [{
        hash: "sha256-247e4b904322a1dd0b148cd77e8627ec7d391251380880ab4621726ecb945ef5",
        category: "artwork"
      }],
      name: "some nft name",
      description: "some nft description",
      image: "ipfs://bafkreiedkaf4w5ogbbnfgp4jyrlvdqmwh3edryszcciee3puyn7nltcomi",
      external_url: "https://openseacreatures.io/3"
    }
  },
)

```

## Returns

`Promise` will be returned which resolves with a `Response` object upon a successful confirmation. `false` will be returned when user flow is cancelled in such a case that a user closes the popup modal.

If the confirmation fails, the `Promise` will resolve with an {error} object that describes the failure.

`Promise<Response | false>`

Note: txReceiptId returns currently 0 in order to avoid slow response due to the congestion for blockchin mining.

### Response

| Variable      | Type        | Description                                             |
| ------------- | ----------- | ------------------------------------------------------- |
| `txReceiptId` | `string`    | ID to identify transaction details in Startrail-API DB. |
| `tx`          | `TxDetails` | Transaction details                                     |

### TxDetails

| Variable      | Type     | Description              |
| ------------- | -------- | ------------------------ |
| `metadataCID` | `string` | A calculated metadataCID |
| `tokenId`     | `string` | A calculated tokenId     |

### Error

Custom `Error` objects. Refer to the [Error Catalogue](/startrail-sdk-js/errors.md) for possible data.

### Response Example

```
{
  "txReceiptId": 0,
  "tx": {
      "tokenId": "209850285627",
      "metadataCID": "bafkreibjdtcklpe5wjgh6qp2dqygaydm3d4xttfhaphgian73bpprkr7xu"
  }
}
```


---

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