package tezos-protocol-019-PtParisB

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package tezos-protocol-019-PtParisB
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Amendments and proposals.

Only delegates having the minimal required stake take part in the amendment procedure. It works as follows:

  • Proposal period: delegates can submit protocol amendment proposals using the proposal operation. At the end of a proposal period, the proposal with most supporters is selected and we move to an exploration period. If there are no proposals, or a tie between proposals, a new proposal period starts.
  • Exploration period: delegates can cast votes to test or not the winning proposal using the ballot operation. At the end of an exploration period if participation reaches the quorum and the proposal has a supermajority in favor, we proceed to a cooldown period. Otherwise we go back to a proposal period. In any case, if there is enough participation the quorum is updated.
  • Cooldown period: business as usual for the main chain. This period is only a time gap between exploration and promotion periods intended to provide the community with extra time to continue testing the new protocol proposal, and start adapting their infrastructure in advance. At the end of the Cooldown period we move to the Promotion period.
  • Promotion period: delegates can cast votes to promote or not the proposal using the ballot operation. At the end of a promotion period if participation reaches the quorum and the proposal has a supermajority in favor, we move to an adoption period. Otherwise we go back to a proposal period. In any case, if there is enough participation the quorum is updated.
  • Adoption period: At the end of an adoption period, the proposal is activated as the new protocol.

The current protocol parameters are documented in src/proto_alpha/lib_parameters/default_parameters.ml

In practice, the real constants used are defined in the migration code. In src/proto_alpha/lib_protocol/init_storage.ml, function prepare_first_block introduces new constants and redefines the existing ones.

If at the end of a voting period, moves to the next one following the state machine of the amendment procedure.

Return the registered testchain dictator, if any. This function will always return None on mainnet.

Check whether the given public key hash corresponds to the registered testchain dictator, if any. This function will always return false on mainnet.

Application of voting operations

There are two kinds of voting operations:

  • Proposals: A delegate submits a list of protocol amendment proposals. This operation is only accepted during a Proposal period (see above).
  • Ballot: A delegate casts a vote for/against the current proposal (or pass). This operation is only accepted during an Exploration or Promotion period (see above).

Update the context with the effects of a Proposals operation:

  • Its proposals are added to the source's recorded proposals.
  • The recorded proposal count of the source is increased by the number of proposals in the operation.

Note that a Proposals operation from a testnet dictator (which may be set up when a test chain is initialized) has completely different effects:

  • If the operation contains no proposal, then the current voting period is immediately and forcibly set to a Proposal period.
  • If the operation contains exactly one proposal, then the current voting period is immediately and forcibly set to an Adoption period for this proposal.

validate_proposals must have been called beforehand, and is responsible for ensuring that apply_proposals cannot fail.

Update the context with the effects of a Ballot operation:

The couple (source of the operation, submitted ballot) is recorded.

validate_ballot must have been called beforehand, and is responsible for ensuring that apply_ballot cannot fail.

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