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  • TEP: 64
  • title: Token Data Standard
  • status: Active
  • type: Contract Interface
  • authors: EmelyanenkoK, Tolya
  • created: 03.02.2022
  • replaces: -
  • replaced by: -

Summary

A standard interface for tokens (meta)data (in particular NFT or Jettons).

Motivation

For applications like wallets or marketplaces it is quite useful to be able automatically retrieve information for display. Token data standard allows to simplify this process and uniform the way of token display across different applications.

Guide

Each token (and also NFT Collection) has its own metadata. It contains some info about token, such as title and associated image. Metadata can be stored offchain (smart contract will contain only a link to json) or onchain (all data will be stored in smart contract).

NFT Collection metadata example (offchain)

Deployed in mainnet at address: EQD7Qtnas8qpMvT7-Z634_6G60DGp02owte5NnEjaWq6hb7v (explorer.tonnft.tools)

Metadata:

{
   "image": "https://s.getgems.io/nft/b/c/62fba50217c3fe3cbaad9e7f/image.png",
   "name": "TON Smart Challenge #2",
   "description": "TON Smart Challenge #2 Winners Trophy",
   "social_links": [],
   "marketplace": "getgems.io"
}

NFT Item metadata example (offchain)

Deployed in mainnet at address: EQA5q4UveXaw6zx359QtgYh1L6c18X0OiAcQPhlkXufwQjOA (explorer.tonnft.tools)

Metadata:

{
   "name": "TON Smart Challenge #2 Winners Trophy",
   "description": "TON Smart Challenge #2 Winners Trophy 1 place out of 181",
   "image": "https://s.getgems.io/nft/b/c/62fba50217c3fe3cbaad9e7f/images/943e994f91227c3fdbccbc6d8635bfaab256fbb4",
   "content_url": "https://s.getgems.io/nft/b/c/62fba50217c3fe3cbaad9e7f/content/84f7f698b337de3bfd1bc4a8118cdfd8226bbadf",
   "attributes": []
}

Jetton metadata example (offchain):

Deployed in mainnet at address: EQD0vdSA_NedR9uvbgN9EikRX-suesDxGeFg69XQMavfLqIw (ton.cx)

Metadata:

{
   "name": "Huebel Bolt",
   "description": "Official token of the Huebel Company",
   "symbol": "BOLT",
   "decimals": 9,
   "image_data": "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"
}

This example shows us that it is possible to embed an image directly in json, without additional links.

Specification

Content representation

Three options can be used:

  1. Off-chain content layout The first byte is 0x01 and the rest is the URI pointing to the JSON document containing the token metadata. The URI is encoded as ASCII. If the URI does not fit into one cell, then it uses the "Snake format" described in the "Data serialization" paragraph, the snake-format-prefix 0x00 is dropped.
  2. On-chain content layout The first byte is 0x00 and the rest is key/value dictionary. Key is sha256 hash of string. Value is data encoded as described in "Data serialization" paragraph.
  3. Semi-chain content layout Data encoded as described in "2. On-chain content layout". The dictionary must have uri key with a value containing the URI pointing to the JSON document with token metadata. Clients in this case should merge the keys of the on-chain dictionary and off-chain JSON doc.

Data serialization

Data that does not fit in one cell can be stored in two ways:

  1. Snake format when we store part of the data in a cell and the rest of the data in the first child cell (and so recursively). Must be prefixed with 0x00 byte. TL-B scheme: 
    tail#_ {bn:#} b:(bits bn) = SnakeData ~0;
cons#_ {bn:#} {n:#} b:(bits bn) next:^(SnakeData ~n) = SnakeData ~(n + 1);
  2. Chunked format when we store data in dictionary chunk_index -> chunk. Must be prefixed with 0x01 byte. TL-B scheme: 
     chunked_data#_ data:(HashMapE 32 ^(SnakeData ~0)) = ChunkedData;

Data that fits into one cell is stored in "Snake format".

If the prefix is not 0x00 or 0x01, then the data is probably encoded by the TL-B schema (relating to a specific smart contract), for example, like in the DNS contract.

Informal TL-B scheme:

text#_ {n:#} data:(SnakeData ~n) = Text;
snake#00 data:(SnakeData ~n) = ContentData;
chunks#01 data:ChunkedData = ContentData;
onchain#00 data:(HashMapE 256 ^ContentData) = FullContent;
offchain#01 uri:Text = FullContent;

Note, that while TL-B scheme does not constrain bit size of each chunk it is expected that all chunks contain ceil number of bytes.

NFT metadata attributes

  1. uri - Optional. Used by "Semi-chain content layout". ASCII string. A URI pointing to JSON document with metadata.
  2. name - Optional. UTF8 string. Identifies the asset.
  3. description - Optional. UTF8 string. Describes the asset.
  4. image - Optional. ASCII string. A URI pointing to a resource with mime type image.
  5. image_data - Optional. Either binary representation of the image for onchain layout or base64 for offchain layout.

Jetton metadata attributes

  1. uri - Optional. Used by "Semi-chain content layout". ASCII string. A URI pointing to JSON document with metadata.
  2. name - Optional. UTF8 string. The name of the token - e.g. "Example Coin".
  3. description - Optional. UTF8 string. Describes the token - e.g. "This is an example jetton for the TON network".
  4. image - Optional. ASCII string. A URI pointing to a jetton icon with mime type image.
  5. image_data - Optional. Either binary representation of the image for onchain layout or base64 for offchain layout.
  6. symbol - Optional. UTF8 string. The symbol of the token - e.g. "XMPL". Used in the form "You received 99 XMPL".
  7. decimals - Optional. If not specified, 9 is used by default. UTF8 encoded string with number from 0 to 255. The number of decimals the token uses - e.g. 8, means to divide the token amount by 100000000 to get its user representation, while 0 means that tokens are indivisible: user representation of token number should correspond to token amount in wallet-contract storage. In case you specify decimals, it is highly recommended that you specify this parameter on-chain and that the smart contract code ensures that this parameter is immutable.
  8. amount_style - Optional. Needed by external applications to understand which format for displaying the number of jettons.
  • "n" - number of jettons (default value). If the user has 100 tokens with decimals 0, then display that user has 100 tokens
  • "n-of-total" - the number of jettons out of the total number of issued jettons. For example, totalSupply Jetton = 1000. A user has 100 jettons in the jetton wallet. For example must be displayed in the user's wallet as 100 of 1000 or in any other textual or graphical way to demonstrate the particular from the general.
  • "%" - percentage of jettons from the total number of issued jettons. For example, totalSupply Jetton = 1000. A user has 100 jettons in the jetton wallet. For example it should be displayed in the user's wallet as 10%.
  1. render_type - Optional. Needed by external applications to understand which group the jetton belongs to and how to display it.
  • "currency" - display as currency (default value).
  • "game" - display for games. It should be displayed as NFT, but at the same time display the number of jettons considering the amount_style

Drawbacks

None

Rationale and alternatives

Proposed standard allows developers to extend (meta)data on demand by introducing new fields without risk of collisions. An alternative to this approach could be predefined set of data fields which, from first glance, could save some storage and gas fees. However, there is no reason not to store the metadata in some compact predefined form in the contract and then just render it in get method (which works offline and thus doesn't waste gas) as Data Standard suggested, allowing lower fees without sacrificing flexibility.

While on-chain data storage is preferred, off-chain/semi-chain options allow flexibly adapt tokens for required usecases.

Prior art

  1. EIP-721
  2. OpenSea metadata guide

Unresolved questions

  1. Shall we authenticate offchain data to prevent it from changing? (NoelJacob)
  2. Shall we support semichain layout, where only some metadata fields may be stored onchain? (tvorogme)
  3. Shall we standardize attributes, traits, and non-image content? (tolya-yanot)

Future possibilities

None

Changelog

  • 14 May 2022 - the standard is now used not only for NFT, but for all tokens in the TON. Added section "Jetton metadata attributes".

  • 31 Aug 2022 - added note about data encoded in TL-B schema in "Data serialization" paragraph.

  • 14 Oct 2022 - render_type and amount_style for Jetton metadata