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91 lines
3.5 KiB
Markdown
91 lines
3.5 KiB
Markdown
# Tributary
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A tributary is a side-chain, created for a specific multisig instance, used
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as a verifiable broadcast layer.
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## Transactions
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### Key Gen Commitments
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`DkgCommitments` is created when a processor sends the coordinator
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`key_gen::ProcessorMessage::Commitments`. When all validators participating in
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a multisig publish `DkgCommitments`, the coordinator sends the processor
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`key_gen::CoordinatorMessage::Commitments`.
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### Key Gen Shares
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`DkgShares` is created when a processor sends the coordinator
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`key_gen::ProcessorMessage::Shares`. When all validators participating in
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a multisig publish `DkgShares`, the coordinator sends the processor
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`key_gen::CoordinatorMessage::Shares`.
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### External Block
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When *TODO*, a `ExternalBlock` transaction is provided. This is used to have
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the group acknowledge and synchronize around the block, without the overhead of
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voting in its acknowledgment.
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When a `ExternalBlock` transaction is included, participants are allowed to
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publish transactions to produce a threshold signature for the block's `Batch`.
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### Substrate Block
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`SubstrateBlock` is provided when the processor sends the coordinator
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`substrate::ProcessorMessage::SubstrateBlockAck`.
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When a `SubstrateBlock` transaction is included, participants are allowed to
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publish transactions for the signing protocols it causes.
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### Batch Preprocess
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`BatchPreprocess` is created when a processor sends the coordinator
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`coordinator::ProcessorMessage::BatchPreprocess` and an `ExternalBlock`
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transaction allowing the batch to be signed has already been included on chain.
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When `t` validators have published `BatchPreprocess` transactions, a
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`coordinator::ProcessorMessage::BatchPreprocesses` is sent to the processor.
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### Batch Share
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`BatchShare` is created when a processor sends the coordinator
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`coordinator::ProcessorMessage::BatchShare`. The relevant `ExternalBlock`
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transaction having already been included on chain follows from
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`coordinator::ProcessorMessage::BatchShare` being a response to a message which
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also has that precondition.
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When the `t` validators who first published `BatchPreprocess` transactions have
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published `BatchShare` transactions, a
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`coordinator::ProcessorMessage::BatchShares` with the relevant shares is sent
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to the processor.
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### Sign Preprocess
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`SignPreprocess` is created when a processor sends the coordinator
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`sign::ProcessorMessage::Preprocess` and a `SubstrateBlock` transaction
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allowing the transaction to be signed has already been included on chain.
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When `t` validators have published `SignPreprocess` transactions, a
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`sign::ProcessorMessage::Preprocesses` is sent to the processor.
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### Sign Share
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`SignShare` is created when a processor sends the coordinator
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`sign::ProcessorMessage::Share`. The relevant `SubstrateBlock` transaction
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having already been included on chain follows from
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`sign::ProcessorMessage::Share` being a response to a message which
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also has that precondition.
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When the `t` validators who first published `SignPreprocess` transactions have
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published `SignShare` transactions, a `sign::ProcessorMessage::Shares` with the
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relevant shares is sent to the processor.
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## Re-attempts
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The key generation and signing protocols, whether batch or transaction, may
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fail if a validator goes offline or takes too long to respond. Accordingly,
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the tributary will schedule re-attempts. These are communicated with
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`key_gen::CoordinatorMessage::GenerateKey`,
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`coordinator::CoordinatorMessage::BatchReattempt`, and
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`sign::CoordinatorMessage::Reattempt`.
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TODO: Document the re-attempt scheduling logic.
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