A perpetual token

Development Research and Development
1

In other words, a token which is guaranteed to exist forever, unless it gets garbage-collected!

{
  val isPerpetual = {(b: Box) =>
    b.propositionBytes == SELF.propositionBytes && b.tokens == SELF.tokens
  }

  sigmaProp(OUTPUTS.exists(isPerpetual))
}

(Actually, this is a perpetual collection of tokens (possibly of size zero). But if you protect a singleton token with this script, then it guarantees the token will never be destroyed other than by garbage collection.)

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