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7 Notaries and consensus
Corda does not organise time into blocks. This is sometimes considered strange,
given that it can be described as a block chain system or `block chain inspired'.
Instead a Corda network has one or more notary services which provide transaction
ordering and timestamping services, thus abstracting the role miners play
in other systems into a pluggable component.
Notaries are expected to be composed of multiple mutually distrusting parties
who use a standard consensus algorithm. Notaries are identi ed by and sign with
composite public keys (§5.2)that conceptually follow the Interledger Crypto-
Conditions speci cation14. Note that whilst it would be conventional to use a
BFT algorithm for a notary service, there is no requirement to do so and in
cases where the legal system is sucient to ensure protocol compliance a higher
performance algorithm like Raft15 may be used. Because multiple notaries can
co-exist a single network may provide a single global BFT notary for general
use and region-speci c Raft notaries for lower latency trading within a uni ed
regulatory area, for example London or New York.
Notaries accept transactions submitted to them for processing and either return
a signature over the transaction, or a rejection error that states that a
double spend has occurred. The presence of a notary signature from the state's
chosen notary indicates transaction nality. An app developer triggers notarisation
by invoking the Finality
ow on the transaction once all other necessary
signatures have been gathered. Once the nality
ow returns successfully, the
transaction can be considered committed to the database.
Corda does not organise time into blocks. This is sometimes considered strange,
given that it can be described as a block chain system or `block chain inspired'.
Instead a Corda network has one or more notary services which provide transaction
ordering and timestamping services, thus abstracting the role miners play
in other systems into a pluggable component.
Notaries are expected to be composed of multiple mutually distrusting parties
who use a standard consensus algorithm. Notaries are identi ed by and sign with
composite public keys (§5.2)that conceptually follow the Interledger Crypto-
Conditions speci cation14. Note that whilst it would be conventional to use a
BFT algorithm for a notary service, there is no requirement to do so and in
cases where the legal system is sucient to ensure protocol compliance a higher
performance algorithm like Raft15 may be used. Because multiple notaries can
co-exist a single network may provide a single global BFT notary for general
use and region-speci c Raft notaries for lower latency trading within a uni ed
regulatory area, for example London or New York.
Notaries accept transactions submitted to them for processing and either return
a signature over the transaction, or a rejection error that states that a
double spend has occurred. The presence of a notary signature from the state's
chosen notary indicates transaction nality. An app developer triggers notarisation
by invoking the Finality
ow on the transaction once all other necessary
signatures have been gathered. Once the nality
ow returns successfully, the
transaction can be considered committed to the database.
Tutto questo mi sembra la descrizione di come funziona esattamente
il mondo notarile attuale (o un qualsiasi mondo a competenza centralizzata):
in pratica esistono dei notai, ed io come utente ho solo la liberta' di sceglierne uno, in base a vari parametri...
ma DEVO sceglierne uno.
in realta' questa "liberta' di scelta" e' assolutamente falsa, perche' io come utente non
avro' mai le competenze per fare una scelta ponderata, ma scegliero' per parametri
"ad cazzum" tipo il notaio che costa meno, oppure il notaio che mi ha consigliato
l'amico, oppure il notaio che viene considerato piu' fico...
un tipico caso dove una apparente liberta' in realta' cela la fregatura che
il "Notaio" con piu' potenza marketing (e non competenza o volare tecnico)
diventera' quello piu' usato.
Insomma, esattamente il tipo di argomentazioni che mi aspetto da entita' centralizzate
che cercano di riproporre modelli dei quali sai poi ESATTAMENTE come assumere il controllo
dei gangli decisionali, spacciandoli per scelte libere.
PS: tra l'altro e' esattamente la metafora di come funziona la democrazia:
io apparentemente ho la liberta' di scegliere, ma poi faccio scelte assolutamente a caso,
per simpatia, o in base a promesse che poi non verranno mantenute, o sull'onda di un incazzatura,
ma fondamentalmente su potenza di marketing di uno dei partiti contendenti,
mai una scelta basata su fattori oggettivi e scientifici
