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# Vesting Example

By
Travis Horn

# Script Contexts

Lecture 3, Part 2

Lecture Video

Remember that a validator takes 3 arguments:

  • Datum
  • Redeemer
  • Script context

The script context is the focus of this lecture. The type is defined in Plutus.V1.Ledger.API . That package must be added to your Cabal configuration when you want to use ScriptContext. The module is defined in Plutus.V2.Ledger.Contexts

Its constructor looks like this:

ScriptContext
  scriptContextTxInfo :: TxInfo
  scriptContextPurpose :: ScriptPurpose

The purpose can be one of:

  • Minting
  • Spending (the one we've been most concerned with)
  • Rewarding
  • Certifying

TxInfo describes much information about the transaction:

  • Inputs
  • Outputs - think about inputs and outputs as they relate to the UTxO model
  • Fee
  • Forge - the amount of newly forged native tokens
  • DCert
  • Wdrl - staking withdrawals / rewards
  • ValidRange - the time range the tx is valid for
  • Signatories - any signatures provided (list of public keys)
  • Data - scripts that spend an output need to include the datum. Scripts that send money to a script provide the has of the datum
  • Id