Enum ProcessedAckResult 

enum ProcessedAckResult<S: PixSpec> {
    NoProgress,
    VerifierNotReady(SsaPolynomialId<<S as PixSpec>::Pseudonym>),
    Progressed(SsaRecoveryProgress<<S as PixSpec>::Pseudonym>),
    InvalidShare(SsaId<<S as PixSpec>::Pseudonym>, u64),
    EarlyRecovery(SsaRecoveryProgress<<S as PixSpec>::Pseudonym>),
    FullRecovery(RecoveredSsa<<S as PixSpec>::Pseudonym, <S as PixSpec>::AddressPrivateKey>, SsaRecoveryProgress<<S as PixSpec>::Pseudonym>),
}

Result of processing a single verified acknowledgement in the SSA reconstructor.

The counters behind SsaRecoveryProgress are updated by process_verified_ack itself, on the cycle it already holds, so these variants only have to say whether a snapshot is worth emitting — not what changed. That is why a duplicate, a surplus share and an unmatched acknowledgement all collapse into NoProgress: none of them moves a counter, so none of them can make a snapshot differ from the last one sent.

Variants

NoProgress

Nothing to report: the acknowledgement matched no pending share, or the share was a duplicate, a surplus, or absorbed by an already-failed polynomial.

VerifierNotReady(SsaPolynomialId<<S as PixSpec>::Pseudonym>)

The share is valid but its polynomial’s verifier is not installed yet, so it cannot be checked. Deferral, not failure: the ack is bucketed under this SsaPolynomialId and retried once the verifier arrives.

Progressed(SsaRecoveryProgress<<S as PixSpec>::Pseudonym>)

The share advanced reconstruction without finishing it.

InvalidShare(SsaId<<S as PixSpec>::Pseudonym>, u64)

The share failed verification. Carries the SSA’s aggregate fault total across all peers.

EarlyRecovery(SsaRecoveryProgress<<S as PixSpec>::Pseudonym>)

The early recovery threshold was crossed.

FullRecovery(RecoveredSsa<<S as PixSpec>::Pseudonym, <S as PixSpec>::AddressPrivateKey>, SsaRecoveryProgress<<S as PixSpec>::Pseudonym>)

Full SSA was recovered. Carries the cycle’s final progress, captured before its state was released — afterwards there is nothing left to read it from.