Contract Tokens

Contract Token Overview

The tokens object defines each type of token in the data contract. At a minimum, a token must consist of conventions and change control rules. Each token must be assigned a unique position within the contract and follow the token constraints.

The following example shows a minimal tokens object defining a single token with basic conventions:

{
  "tokens": {
    "0": {
      "$format_version": "0",
      "conventions": {
        "$format_version": "0",
        "localizations": {
          "en": {
            "$format_version": "0",
            "shouldCapitalize": false,
            "singularForm": "credit-token",
            "pluralForm": "credit-tokens"
          }
        },
        "decimals": 8
      }
    }
  }
}

Tokens may also define distribution rules, history tracking, marketplace rules, and various configuration options. Refer to this table for a brief description of the major token sections:

Feature	Description
Conventions	Display properties including localization, decimals, and naming conventions
Configuration	Behavioral settings for token operations, freezing, and emergency actions
Change Control Rules	Authorization rules governing who can modify token parameters
Distribution Rules	Rules for token distribution, minting destinations, and pricing
History Tracking	Configuration for recording token operations in Platform history

Token Creation Fees

Token creation incurs specific fees based on which token features are used:

Operation	Fee (DASH)	Description
Token registration	0.1	Base fee for adding a token to a contract
Perpetual distribution	0.1	Fee for enabling perpetual distribution
Pre-programmed distribution	0.1	Fee for enabling pre-programmed distribution
Search keyword fee	0.1	Per keyword fee for including search keywords

Assigning Position

Each token in the tokens object must be assigned a unique position value, with ordering starting at zero and incrementing with each token. The position is used as the key in the tokens object and indicates which token to perform operations on when a contract contains multiple tokens.

{
  "tokens": {
    "0": { /* first token definition */ },
    "1": { /* second token definition */ },
    "2": { /* third token definition */ }
  }
}

Token Conventions

The conventions object defines the display and formatting properties of a token. It includes localization settings, decimal precision, and naming conventions that determine how the token is presented to users.

Localization

The localizations object contains language-specific display properties using ISO 639-1 language codes as keys. Each localization entry includes:

Property	Type	Description
`$format_version`	string	Version of the localization format (currently "0")
`shouldCapitalize`	boolean	Whether the token name should be capitalized when displayed
`singularForm`	string	Singular form of the token name
`pluralForm`	string	Plural form of the token name

"localizations": {
  "en": {
    "$format_version": "0", 
    "shouldCapitalize": true,
    "singularForm": "loyalty-point",
    "pluralForm": "loyalty-points"
  },
  "es": {
    "$format_version": "0",
    "shouldCapitalize": false,
    "singularForm": "punto-de-lealtad", 
    "pluralForm": "puntos-de-lealtad"
  }
}

Decimal Precision

The decimals property specifies the number of decimal places for token amounts. This affects how token balances are displayed and calculated. If decimals is set to zero, token operations (e.g., mint, transfer) will only allow integer amounts.

"conventions": {
  "$format_version": "0",
  "localizations": { /* ... */ },
  "decimals": 8  // 8 decimal places (default)
}

Token Configuration

Token configuration controls behavioral aspects of token operations, including supply management, operational controls, and security features.

Supply Management

Property	Type	Description
`baseSupply`	unsigned integer	Initial supply of tokens created at contract deployment
`maxSupply`	unsigned integer	Maximum number of tokens that can ever exist (null for unlimited)

Operational Controls

Property	Type	Description
`startAsPaused`	boolean	Whether the token begins in a paused state where tokens cannot be transferred
`allowTransferToFrozenBalance`	boolean	Whether transfers to frozen balances are permitted

Control Group Management

Property	Type	Description
`mainControlGroup`	unsigned integer	Position assigned to the main control group
`mainControlGroupCanBeModified`	string	Authorization level for modifying the main control group

Example:

{
  "baseSupply": 1000000,
  "maxSupply": 10000000,
  "startAsPaused": false,
  "allowTransferToFrozenBalance": true,
  "mainControlGroup": null,
  "mainControlGroupCanBeModified": "NoOne"
}

Token Change Control Rules

Change control rules define authorization requirements for modifying various aspects of a token after deployment. These rules specify who can make changes and under what conditions.

Authorized Parties

Rules can authorize no one, specific identities, or multiparty groups. The complete set of options defined by DPP is:

Authorized Party	Description
`NoOne`	No one is authorized
`ContractOwner`	Only the contract owner is authorized
`Identity(Identifier)`	Only an identity is authorized
`MainGroup`	Only the main control group is authorized
`Group(<x>)`	Only the specific group based in contract position "x" is authorized

Change Rule Structure

Each rule consists of the following parameters defined in DPP that control its behavior:

Field	Description
`authorized_to` `_make_change`	This is who is authorized to make such a change. Valid values are listed in the authorized parties table.
`admin_action_takers`	This is who is authorized to make such a change to the people authorized to make a change. Valid values are listed in the authorized parties table.
`changing_authorized` `_action_takers_to` `_no_one_allowed`	Are we allowed to change to `NoOne` in the future (default: false)
`changing_admin_action` `_takers_to_no_one_allowed`	Are we allowed to change the admin action takers to `NoOne` in the future (default: false)
`self_changing_admin_` `action_takers_allowed`	Can the admin action takers change themselves (default: false)

Example

"<rule_name>": {
  "V0": {
    "authorized_to_make_change": "ContractOwner",
    "admin_action_takers": "NoOne",
    "changing_authorized_action_takers_to_no_one_allowed": false,
    "changing_admin_action_takers_to_no_one_allowed": false,
    "self_changing_admin_action_takers_allowed": false
  }
}

Available Change Rules

Tokens support the following change control rules:

Rule Name	Description
`conventionsChangeRules`	Controls who can modify token conventions (localization)
`maxSupplyChangeRules`	Controls who can modify the maximum supply limit
`perpetualDistributionRules`	Controls who can modify perpetual distribution settings (subset of `distributionRules`)
`preProgrammedDistribution`	Controls who can modify pre-programmed distribution settings (subset of `distributionRules`)
`newTokensDestinationIdentityRules`	Controls who can change where new tokens are sent (subset of `distributionRules`)
`mintingAllowChoosingDestinationRules`	Controls who can modify minting destination rules (subset of `distributionRules`)
`changeDirectPurchasePricingRules`	Controls who can set direct purchase pricing (subset of `distributionRules`)
`tradeModeChangeRules`	Controls who can modify trade mode rules (subset of `marketplaceRules`)
`manualMintingRules`	Controls who can manually mint tokens
`manualBurningRules`	Controls who can manually burn tokens
`freezeRules`	Controls who can freeze token balances
`unfreezeRules`	Controls who can unfreeze token balances
`destroyFrozenFundsRules`	Controls who can destroy frozen funds
`emergencyActionRules`	Controls who can execute emergency actions

Example:

"manualMintingRules": {
  "V0": {
    "authorized_to_make_change": "ContractOwner",
    "admin_action_takers": "NoOne",
    "changing_authorized_action_takers_to_no_one_allowed": false,
    "changing_admin_action_takers_to_no_one_allowed": false,
    "self_changing_admin_action_takers_allowed": false
  }
}

Token Distribution Rules

Distribution rules govern how tokens are created, allocated, and priced within the platform. These rules provide flexible mechanisms for token distribution and marketplace integration.

Distribution Properties

Property	Type	Description
`perpetualDistribution`	object	Ongoing distribution mechanism for continuous token allocation
`perpetualDistributionRules`	object	Change control rules for perpetual distribution
`preProgrammedDistribution`	object	Scheduled distribution events with specific timing and recipients
`newTokensDestinationIdentity`	string	Default identity to receive newly minted tokens
`newTokensDestinationIdentityRules`	object	Change control rules for destination identity
`mintingAllowChoosingDestination`	boolean	Whether minting operations can specify custom destinations
`mintingAllowChoosingDestinationRules`	object	Change control rules for destination choice
`changeDirectPurchasePricingRules`	object	Change control rules for direct purchase pricing

Perpetual Distribution

Perpetual distribution enables ongoing token allocation. The following configuration distributes 100 tokens to the contract owner every 60 minutes (3600000 ms):

"perpetualDistribution": {
  "$format_version": "0",
  "distributionType": {
    "TimeBasedDistribution": {
      "interval": 3600000,
      "function": {
        "FixedAmount": {
          "amount": 100
        }
      }
    }
  },
  "distributionRecipient": "ContractOwner"
}

Perpetual Distribution Options

A wide variety of emission patterns are provided to cover most common scenarios. The following table summarizes the options and links to further details.

Name	Description
Fixed Amount	Emits a constant number of tokens per period
Random	Emits a random amount between `min` and `max`, using a PRF
Step Decreasing Amount	Emits tokens that decrease in discrete steps at fixed intervals
Linear	Linear growth/decay with integer or fractional precision
Polynomial	Polynomial with integer or fractional exponents or coefficients
Exponential	Emits tokens following an exponential function
Logarithmic	Slows emission over time
Inverted Logarithmic	Slows emission over time
Stepwise	Emits constant values within predefined steps

Fixed Amount

Emits a constant (fixed) number of tokens for every period.

Formula: f(x) = n
Use Case:
- When a predictable, unchanging reward is desired.
- Simplicity and stable emissions.
Example: If n = 5 tokens per block, then after 3 blocks the total emission is 15 tokens.

Random

Emits a random number of tokens within a specified range.

Formula: f(x) ∈ [min, max]
- Constraints:
  - min must be ≤ max, otherwise the function is invalid.
  - If min == max, this behaves like a Fixed Amount function with a constant emission.
Description
- This function selects a random token emission amount between min and max.
- The value is drawn uniformly between the bounds.
- The randomness uses a Pseudo Random Function (PRF) from x.
Use Case
- Stochastic Rewards: Introduces randomness into rewards to incentivize unpredictability.
- Lottery-Based Systems: Used for randomized emissions, such as block rewards with probabilistic payouts.
Example

Suppose a system emits between 10 and 100 tokens per period.
```
Random { min: 10, max: 100 }
```
Period (x) Emitted Tokens (Random)

1 27

2 94

3 63

4 12
- Each period, the function emits a random number of tokens between min = 10 and max = 100.
- Over time, the average reward trends toward the midpoint (min + max) / 2.

Period (x)	Emitted Tokens (Random)
1	27
2	94
3	63
4	12

Step Decreasing Amount

Emits tokens that decrease in discrete steps at fixed intervals.

Formula: f(x) = n * (1 - (numerator / denominator))^((x - s) / step_count)
Description: Reduces token emissions by a fixed percentage at regular intervals. Includes optional start offset and minimum emission floor.
- step_count: number of periods between each step
- numerator and denominator: the reduction factor per step
- s: optional start period offset (e.g., start block or time). If not provided, the contract creation start is used.
- n: initial token emission amount
- min_value: optional minimum emission value
Use Case: Reward systems with predictable decay—ideal for Bitcoin-style halvings or Dash-style gradual reductions
Example:
- Bitcoin: 50% reduction every 210,000 blocks
- Dash: ~7% reduction every 210,240 blocks

Linear

Emits tokens following a linear function that can increase or decrease over time with fractional precision.

Formula: f(x) = (a * (x - s) / d) + b
Description: Supports both integer and fractional slopes via a / d ratio. Enables precise reward schedules without floating-point rounding errors.
- Parameters
  - a: slope numerator (positive = increase, negative = decrease)
  - d: slope divisor (enables fractional precision)
  - s: optional start period offset (defaults to contract creation)
  - b: starting emission amount
  - min_value / max_value: optional emission bounds
- Behavior
  - If a > 0, emissions increase linearly over time
  - If a < 0, emissions decrease linearly over time
  - If a = 0, emissions remain constant at b
Use Case: Predictable inflation or deflation, gradual reward scaling, clamped emission schedules
Example:
- Increasing Linear Emission: f(x) = (1 * (x - 0) / 1) + 10
- Decreasing Linear Emission: f(x) = (-2 * (x - 0) / 1) + 100
- Delayed Start: f(x) = (5 * (x - 10) / 1) + 50
- Clamping Emissions: f(x) = (2 * (x - 0) / 1) + 50

Polynomial

A polynomial function using fixed-point arithmetic for fractional or integer exponents.

Formula:
f(x) = (a * (x - s + o)^(m / n)) / d + b
Description:
Emits tokens based on a polynomial curve, where the exponent is defined as a fraction (m / n). This enables a wide range of growth or decay behaviors—linear, quadratic, root-based, and more—using precise fixed-point logic.
Parameters:
- a: coefficient scaling the curve (positive for growth, negative for decay)
- m and n: exponent numerator and denominator, allowing fractional powers (e.g., m = 1, n = 2 → square root)
- d: divisor to scale the result
- s: optional start period offset
- o: offset inside the exponent input
- b: amount added after the curve is computed
- min_value / max_value: optional boundaries to clamp emissions
Use Case:
- Accelerating Growth: Use a > 0 and m > 1 for quadratic/cubic growth
- Diminishing Emissions: Use a < 0 and fractional exponents for decaying curves
- Root-based Models: Use m = 1, n > 1 to slow down early growth
- Flexibility: Fine-tune emission behavior with high control over shape
Example:
- Increasing Polynomial Growth: f(x) = (2 * (x - s + o)^2) / d + 10
- Decreasing Polynomial Decay: f(x) = (5 * (x - s + o)^(-1)) / d + 10
- Inverted Growth → Decreasing Over Time: f(x) = (-3 * (x - s + o)^2) / d + 50
- Inverted Decay → Slowing Increase: f(x) = (-10 * (x - s + o)^(-2)) / d + 50

Exponential

Emits tokens following an exponential function.

Formula: f(x) = a * e^(b * x) + c
Description:
- b > 0 -> rapid growth
- b < 0 -> rapid decay
Use Case: Early contributor boosts or quick emission tapering
Example: f(x) = 100 * e^(-0.693 * x) + 5

Logarithmic

Logarithmic growth of token emissions.

Formula: f(x) = a * log_b(x) + c
Description: Growth slows as x increases
Use Case: Sustainable long-term emission tapering
Example: f(x) = 20 * log_2(x) + 5

Inverted Logarithmic

Emits tokens following an inverted logarithmic decay curve.

Formula:
f(x) = (a * log(n / (m * (x - s + o)))) / d + b
Description:
Emits a high number of tokens initially, with emissions decreasing rapidly at first, then slowing over time. Useful when early adoption or front-loaded incentives are desired.
Parameters:
- a: scaling factor for the log term
- d: divisor to scale the final result
- m and n: Control the logarithmic inversion
- o: offset applied inside the logarithm
- s: optional start period offset (defaults to contract creation time if not provided)
- b: offset added after scaling
- min_value / max_value: optional bounds to constrain emissions
Use Case:
- Gradual Decay of Rewards: Prioritize early users with higher emissions that reduce over time
- Resource Draining / Controlled Burn: Designed for token models where supply tapers gradually
- Airdrops & Grants: Rewards diminish for late claimants, encouraging early participation
Example:
- f(x) = (1000 * log(5000 / (5 * (x - 1000)))) / 10 + 10
- Sample outputs:
  
  Period (x) Emission (f(x))
  
  1000 500 tokens
  
  1500 230 tokens
  
  2000 150 tokens
  
  5000 50 tokens
  
  10,000 20 tokens
  
  50,000 10 tokens
- Starts high and decays gradually without hitting zero too fast

Period (x)	Emission (f(x))
1000	500 tokens
1500	230 tokens
2000	150 tokens
5000	50 tokens
10,000	20 tokens
50,000	10 tokens

Stepwise

Emits tokens in fixed amounts for specific intervals.

Description: Emissions remain constant within each step
Use Case: Adjust rewards at specific milestones
Example: 100 tokens per block for first 1000 blocks, then 50 tokens thereafter

Pre-Programmed Distribution

Pre-programmed distribution allows scheduling specific token allocations at predetermined times. The following configuration distributes 3 sets of tokens to the same identity at the defined timestamps:

"preProgrammedDistribution": {
  "$format_version": "0",
  "distributions": {
    "1749662152621": {
      "2yZbE3TAZAhLwNVQk7JMUUuBXgrVt1NG172PGjeUfjUo": 100
    },
    "1749665692621": {
      "2yZbE3TAZAhLwNVQk7JMUUuBXgrVt1NG172PGjeUfjUo": 1000
    },
    "1781198092621": {
      "2yZbE3TAZAhLwNVQk7JMUUuBXgrVt1NG172PGjeUfjUo": 1000000
    }
  }
}

Direct Purchase Pricing

Direct purchase pricing enables tokens to be purchased directly using Platform:

"changeDirectPurchasePricingRules": {
  "V0": {
    "authorized_to_make_change": "ContractOwner",
    "admin_action_takers": "NoOne",
    "changing_authorized_action_takers_to_no_one_allowed": false,
    "changing_admin_action_takers_to_no_one_allowed": false,
    "self_changing_admin_action_takers_allowed": false
  }
}

Token History Tracking

Token history tracking controls which operations are recorded in Platform's historical records. This provides audit trails and transparency for token operations.

History Properties

Property	Type	Default	Description
`keepsTransferHistory`	boolean	true	Record all token transfers
`keepsFreezingHistory`	boolean	true	Record freeze/unfreeze operations
`keepsMintingHistory`	boolean	true	Record token minting events
`keepsBurningHistory`	boolean	true	Record token burning events
`keepsDirectPricingHistory`	boolean	true	Record direct purchase price changes
`keepsDirectPurchaseHistory`	boolean	true	Record direct purchase transactions

Example:

"keepsHistory": {
  "$format_version": "0",
  "keepsTransferHistory": true,
  "keepsFreezingHistory": true,
  "keepsMintingHistory": true,
  "keepsBurningHistory": true,
  "keepsDirectPricingHistory": true,
  "keepsDirectPurchaseHistory": false
}

Token Marketplace Rules

Marketplace rules define how tokens can be traded within Platform's built-in marketplace system.

Trade Modes

Mode	Description
`NotTradeable`	Token cannot be traded on the marketplace

Example:

"marketplaceRules": {
  "$format_version": "0",
  "tradeMode": "NotTradeable",
  "tradeModeChangeRules": {
    "V0": {
      "authorized_to_make_change": "NoOne",
      "admin_action_takers": "NoOne",
      "changing_authorized_action_takers_to_no_one_allowed": false,
      "changing_admin_action_takers_to_no_one_allowed": false,
      "self_changing_admin_action_takers_allowed": false
    }
  }
}

Token Constraints

For performance and security reasons, tokens have the following constraints:

General Constraints

Parameter	Value
Maximum number of keywords	50
Keyword length	3 to 50 characters
Description length	3 to 100 characters
Maximum note length	2048 characters
Maximum number of tokens per contract	Only limited by maximum contract size

Convention Constraints

Parameter	Value
Language code length	2 to 12 characters
Token name length (singular)	3 to 25 characters
Token name length (plural)	3 to 25 characters
Decimal places	0 to 16
Maximum localization entries	Only limited by maximum contract size

Supply Constraints

Parameter	Value
Maximum token amount	2^64 - 1

Example Syntax

This example shows the complete structure of a token definition with all major configuration options:

{
  "tokens": {
    "0": {
      "$format_version": "0",
      "conventions": {
        "$format_version": "0",
        "localizations": {
          "en": {
            "$format_version": "0",
            "shouldCapitalize": true,
            "singularForm": "reward-token",
            "pluralForm": "reward-tokens"
          }
        },
        "decimals": 8
      },
      "conventionsChangeRules": {
        "V0": {
          "authorized_to_make_change": "NoOne",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "baseSupply": 1000000,
      "maxSupply": 10000000,
      "keepsHistory": {
        "$format_version": "0",
        "keepsTransferHistory": true,
        "keepsFreezingHistory": true,
        "keepsMintingHistory": true,
        "keepsBurningHistory": true,
        "keepsDirectPricingHistory": true,
        "keepsDirectPurchaseHistory": true
      },
      "startAsPaused": false,
      "allowTransferToFrozenBalance": true,
      "maxSupplyChangeRules": {
        "V0": {
          "authorized_to_make_change": "ContractOwner",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "distributionRules": {
        "$format_version": "0",
        "perpetualDistribution": null,
        "perpetualDistributionRules": {
          "V0": {
            "authorized_to_make_change": "NoOne",
            "admin_action_takers": "NoOne",
            "changing_authorized_action_takers_to_no_one_allowed": false,
            "changing_admin_action_takers_to_no_one_allowed": false,
            "self_changing_admin_action_takers_allowed": false
          }
        },
        "preProgrammedDistribution": null,
        "newTokensDestinationIdentity": null,
        "newTokensDestinationIdentityRules": {
          "V0": {
            "authorized_to_make_change": "ContractOwner",
            "admin_action_takers": "NoOne",
            "changing_authorized_action_takers_to_no_one_allowed": false,
            "changing_admin_action_takers_to_no_one_allowed": false,
            "self_changing_admin_action_takers_allowed": false
          }
        },
        "mintingAllowChoosingDestination": true,
        "mintingAllowChoosingDestinationRules": {
          "V0": {
            "authorized_to_make_change": "ContractOwner",
            "admin_action_takers": "NoOne",
            "changing_authorized_action_takers_to_no_one_allowed": false,
            "changing_admin_action_takers_to_no_one_allowed": false,
            "self_changing_admin_action_takers_allowed": false
          }
        },
        "changeDirectPurchasePricingRules": {
          "V0": {
            "authorized_to_make_change": "ContractOwner",
            "admin_action_takers": "NoOne",
            "changing_authorized_action_takers_to_no_one_allowed": false,
            "changing_admin_action_takers_to_no_one_allowed": false,
            "self_changing_admin_action_takers_allowed": false
          }
        }
      },
      "manualMintingRules": {
        "V0": {
          "authorized_to_make_change": "ContractOwner",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "manualBurningRules": {
        "V0": {
          "authorized_to_make_change": "ContractOwner",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "freezeRules": {
        "V0": {
          "authorized_to_make_change": "NoOne",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "unfreezeRules": {
        "V0": {
          "authorized_to_make_change": "NoOne",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "destroyFrozenFundsRules": {
        "V0": {
          "authorized_to_make_change": "NoOne",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "emergencyActionRules": {
        "V0": {
          "authorized_to_make_change": "NoOne",
          "admin_action_takers": "NoOne",
          "changing_authorized_action_takers_to_no_one_allowed": false,
          "changing_admin_action_takers_to_no_one_allowed": false,
          "self_changing_admin_action_takers_allowed": false
        }
      },
      "mainControlGroup": null,
      "mainControlGroupCanBeModified": "NoOne",
      "description": "Reward token for customer loyalty program"
    }
  }
}

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Contract Tokens

Contract Token Overview

Token Creation Fees

Assigning Position

Token Conventions

Localization

Decimal Precision

Token Configuration

Supply Management

Operational Controls

Control Group Management

Token Change Control Rules

Authorized Parties

Change Rule Structure

Available Change Rules

Token Distribution Rules

Distribution Properties

Perpetual Distribution

Perpetual Distribution Options

Fixed Amount

Random

Step Decreasing Amount

Linear

Polynomial

Exponential

Logarithmic

Inverted Logarithmic

Stepwise

Pre-Programmed Distribution

Direct Purchase Pricing

Token History Tracking

History Properties

Token Marketplace Rules

Trade Modes

Token Constraints

General Constraints

Convention Constraints

Supply Constraints

Example Syntax