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|`TransactionType`| String | UINT16 | Type is `NFTokenModify`. |
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|`Account`| String | AccountID | The unique address of either the issuer or an authorized minter of the NFT. |
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|`Owner`| String | AccountID |_(Optional)_ Address of the owner of the NFT. If the `Account` and `Owner` are the same address, omit this field. |
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|`NFTokenID`| String | Hash 256 | Composite field that uniquely identifies the token. |
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|`URI`| String | Blob |_(Optional)_ Up to 256 bytes of arbitrary data. In JSON, this should be encoded as a string of hexadecimal. You can use the [`xrpl.convertStringToHex`](https://js.xrpl.org/modules.html#convertStringToHex) utility to convert a URI to its hexadecimal equivalent. This is intended to be a URI that points to the data or metadata associated with the NFT. The contents could decode to an HTTP or HTTPS URL, an IPFS URI, a magnet link, immediate data encoded as an [RFC 2379 "data" URL](https://datatracker.ietf.org/doc/html/rfc2397), or even an issuer-specific encoding. The URI is not checked for validity. If you do not specify a URI, the existing URI is deleted. |
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|`Account`| String | AccountID | The unique address of either the issuer or an authorized minter of the NFT. |
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|`Owner`| String | AccountID |_(Optional)_ Address of the owner of the NFT. If the `Account` and `Owner` are the same address, omit this field. |
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|`NFTokenID`| String | Hash256 | Composite field that uniquely identifies the token. |
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|`URI`| String | Blob |_(Optional)_ Up to 256 bytes of arbitrary data. In JSON, this should be encoded as a string of hexadecimal. You can use the [`xrpl.convertStringToHex`](https://js.xrpl.org/modules.html#convertStringToHex) utility to convert a URI to its hexadecimal equivalent. This is intended to be a URI that points to the data or metadata associated with the NFT. The contents could decode to an HTTP or HTTPS URL, an IPFS URI, a magnet link, immediate data encoded as an [RFC 2379 "data" URL](https://datatracker.ietf.org/doc/html/rfc2397), or even an issuer-specific encoding. The URI is not checked for validity. If you do not specify a URI, the existing URI is deleted. |
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## Error Cases
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Besides errors that can occur for all transactions, {% $frontmatter.seo.title %} transactions can result in the following [transaction result codes](../transaction-results/index.md):
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| Error Code | Description |
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|:-------------------|:------------|
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|`tecNO_PERMISSION`| The `tfMutable` flag wasn't enabled, so you can't update the `URI` field. You can also receive this error if the `Account` field isn't an issuer or authorized minter of the NFT. |
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