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Metadata

Generally, metadata is used to store some information on-chain. While you want to store slow-data like rarity or level, you most likely don't want to store fast-data like HP and durability. The main reason to not store fast-data on chain is someone has to update it and pay for transaction.

For now only 5 types are stored on-chain:

TEMPLATE_ID​

All tokens have this attribute, it refers to the item template id in the database

  • it can't be created as attribute in Grade mechanic for any template
  • can't be changed by any mechanic

Example: 1-2147483647; int4

LEVEL​

LEVEL is the default attribute for the Grade mechanic and Discrete feature.

  • tokens can be searched by this attribute
  • there is page with statistic over this attribute
  • can be changed for a price
  • this and other attributes from Grade mechanic are displayed on token page

Example: 1-115792089237316195423570985008687907853269984665640564039457584007913129639935; uint256

RARITY​

RARITY is the default attribute for ChainLink integration and Random feature.

  • tokens can be searched by this attribute
  • there is page with statistic over this attribute
  • this attribute is displayed on token page
  • can't be changed by any mechanic
  • it can't be created as attribute in Grade mechanic for templates that contains Random and Discrete features

Example: 0-4; common, uncommon, rare, epic, legendary

GENES​

GENES is the default attribute for the Breeding mechanic and Genes feature.

  • this attribute is displayed on token page in decoded format
  • can't be changed by any mechanic
  • it can't be created as attribute in Grade mechanic for templates that contains Genes and Discrete features
Example: 5846006549663894039973362281908193186987844304901; { a1: 4, a2: 1, a3: 3, a4: 2, a5: 1, a6: 5 }

TRAITS​

TRAITS is the default attribute for the Collectible mechanic.

  • this attribute is displayed on token page in decoded format
  • can't be changed by any mechanic
Example: 5846006549663894039973362281908193186987844304901; { a1: 4, a2: 1, a3: 3, a4: 2, a5: 1, a6: 5 }