Research corpus PrivacyBLC-STUDY-0419

EIP-721 Metadata Update Extension

ERC 4906, EIP-721 Metadata Update Extension. Many EIP-721 contracts emit an event when one of its tokens' metadata are changed.

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Record

Authors: Anders , Lance , Shrug , Nathan
Date: 2022
Publisher: Anders , Lance , Shrug , Nathan
Version: Source cited by the 2022 study. The study is the reading. This page does not add a second essay.
Document ID: BLC-STUDY-0419
DOI: None recorded
Last reviewed: 1 October 2026
Licence: No licence recorded. Rights status under review.

No hash is published. This build does not store those PDF bytes, so a checksum would be invented. Where a legacy path exists, it points at the Internet Archive copy of the old library.

Direct answer

ERC 4906, EIP-721 Metadata Update Extension. Many EIP-721 contracts emit an event when one of its tokens' metadata are changed.

Where to read

Official source — ERC 4906
Blockchain Lab study, the canonical readingOriginal commentary. Not a transcription of the paper.

Metadata and commentary only. The reading is the study page.

Full text

Full text is not published on this page. Public availability is not a licence to republish a document. Blockchain Lab has not recorded a licence that permits an HTML transcription, a training set, or a retrieval corpus of the paper. Text on this page is Blockchain Lab's own wording, or a pointer to a study that is also Blockchain Lab's wording.

What changed

Status in the source: Final. A reading of the public specification, not a copy of it and not a certification.

Relationships

Canonical readingERC 4906 study
Related paperGroth16
Related paperBulletproofs
Related paperTaproot

Cite this record

These citations point at the source document. They are not a licence to copy it.

Author–date

Anders, Lance, Shrug, & Nathan (2022). EIP-721 Metadata Update Extension. Anders , Lance , Shrug , Nathan. https://eips.ethereum.org/EIPS/eip-4906

BibTeX

@techreport{erc49062022,
  title = {EIP-721 Metadata Update Extension},
  author = {Anders , Lance , Shrug , Nathan},
  year = {2022},
  institution = {Anders , Lance , Shrug , Nathan},
  url = {https://eips.ethereum.org/EIPS/eip-4906},
  note = {Rights status: Official external source only. Blockchain Lab record: https://blockchainlab.com/research/corpus/papers/erc-4906}
}

RIS

TY  - RPRT
TI  - EIP-721 Metadata Update Extension
AU  - Anders
AU  - Lance
AU  - Shrug
AU  - Nathan
PY  - 2022
PB  - Anders , Lance , Shrug , Nathan
UR  - https://eips.ethereum.org/EIPS/eip-4906
N1  - Rights status: Official external source only
ER  -

CSL-JSON

[
  {
    "type": "report",
    "id": "BLC-STUDY-0419",
    "title": "EIP-721 Metadata Update Extension",
    "author": [
      {
        "literal": "Anders"
      },
      {
        "literal": "Lance"
      },
      {
        "literal": "Shrug"
      },
      {
        "literal": "Nathan"
      }
    ],
    "issued": {
      "date-parts": [
        [
          2022
        ]
      ]
    },
    "publisher": "Anders , Lance , Shrug , Nathan",
    "URL": "https://eips.ethereum.org/EIPS/eip-4906",
    "note": "Rights status: Official external source only. Not a licence to republish the paper."
  }
]

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Rights record

Source status: Official source
Use status: Metadata and commentary only. The reading is the study page.
Rights: Official external source only
Training and retrieval: Not permitted from this site. There is no rights-cleared full text to retrieve or to train on.

Rights and licensing Corrections