Blockchain in 2016 - Advanced Distributed Ledger Technologies
Blockchain Definition and Foundational Building …...blockchain • Event driven program with state...
Transcript of Blockchain Definition and Foundational Building …...blockchain • Event driven program with state...
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Blockchain Definition and Foundational Building Blocks
David Tennenhouse <[email protected]>
Brian Behlendorf <[email protected]>
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Our questions:1. What is an overarching blockchain definition that can be used to advance community/legislative
discussions? (consider other states and federal definitions to reach alignment counties/states/global systems)
2. How can the context of an application be incorporated to the blockchain definition to highlight different aspects of blockchain?
3. What components of blockchain should be highlighted? How should these components be incorporated into a decision making and an assessment process to determine blockchain technology appropriateness for any use case?
4. Consider the consequences of too narrow or too broad of a definition to ensure that we forge an adaptive path forward for blockchain implementation in California. Consider implication beyond this legislation.
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Approach to definition
Abstract (function)
Concrete(form / implementation)
Application-specific
Application-independent
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Example:
Transfer of assets
Generic state machine
Trading sytem
Record ofstock holders
Application-specific
Application-independent
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Example:
Crypto-sealedTwo or More
Verifiable Order
Abstract (function)
Concrete(form / implementation)
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Datastore vocabulary• Datastore / Record / Log / Ledger of Inputs/Actions• Decentralized / Distributed / shared / replicated• Uniformly ordered / Consistency / Chronological
State Machine Replication, finalized, etc.• Immutable / Auditable / Reproduceable / Non-repudiation
Retrievable and reproducible in paper form (applies to specific records)
• Mathematically verified / Validated by use of crypto / Crypto-Sealed / Crypto-secured
Method to verify and store record(s) secured by the crypto hash of previous transaction info
• Blocks• Data address
String of chars only accessible using a private key to facilitate or record transactions (also used for identity and signatures)
Smart contracts and token vocabulary• Contract stored as a record than can be verified by a
blockchain• Event driven program with state / runs on xxx ledger / can
take custody (instruct) transfer of assets on ledger• Tokens – capable of being traded w/o an intermediary• Tracking tangible/intangible assets
Governance vocabulary• Public / Private• Permission / Permissionless• Unaffiliated parties• Redundantly maintained by 2 or more…• Tokenized crypto economics, rewards• Uncensored• Visibility into and ability to validate and/or change
state of datastore
We looked at vocabulary and phrases used by some other states(not an exhaustive survey)
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Datastore vocabulary• Datastore / Record / Log / Ledger of Inputs/Actions• Decentralized / Distributed / shared / replicated• Uniformly ordered / Consistency / Chronological
State Machine Replication, finalized, etc.• Immutable / Auditable / Reproduceable / Non-repudiation
Retrievable and reproducible in paper form (applies to specific records)
• Mathematically verified / Validated by use of crypto / Crypto-Sealed / Crypto-secured
Method to verify and store record(s) secured by the crypto hash of previous transaction info
• Blocks• Data address
String of chars only accessible using a private key to facilitate or record transactions (also used for identity and signatures)
Smart contracts and token vocabulary• Contract stored as a record than can be verified by a
blockchain• Event driven program with state / runs on xxx ledger / can
take custody (instruct) transfer of assets on ledger• Tokens – capable of being traded w/o an intermediary• Tracking tangible/intangible assets
Governance vocabulary• Public / Private• Permission / Permissionless• Unaffiliated parties• Redundantly maintained by 2 or more…• Tokenized crypto economics, rewards• Uncensored• Visibility into and ability to validate and/or change
state of datastore
…with an eye to retaining the concepts most generic and essential to blockchain function…while avoiding those that appeared prescriptive wrt application or implementation
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Datastore: verifiability of data shared amongst participants
Datastore
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Datastore can be used by many types of participants / applications
Datastore
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There can also be many datastores
DatastoreDatastoreDatastore
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A consensus mechanism is typically used to ensure the verifiable ordering of transactions (changes to the datastore)
Internet
Datastore
Consensus Consensus Consensus Consensus Consensus
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…the nodes of the consensus layer cooperate to maintain the verifiable ordering of transactions
Datastore
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Smart contracts: Allow participants to automate pre-agreed business processes
Smart Contracts
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Smart Contract Mechanism: Rules & State
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Contract state can be kept in the datastore
Datastore
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Contract rules can also be kept in the datastore!
Datastore
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…with the verifiable ordering implemented by a consensus layer
Smart
Contracts
Datastore
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Putting it all together…
Internet
Datastore
Consensus Consensus Consensus Consensus Consensus
Smart Contracts
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Our Proposed DefinitionBlockchain technology is used to build decentralized systems that increase the verifiability of data shared amongst a group of participants, which brings increased trust to the overall system.
This definition includes specialized datastores, sometimes called “distributed ledgers”, that provide a verifiable ordering of transactions on the datastore.
This definition also includes “smart contracts”, which allow participants to automate pre-agreed business processes, which are implemented by the system as a whole through transactions on the datastore.
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Permissionless Public Permissionless Private Permissioned Public Permissioned Private
“Distributed Finance”, permissioned smart
contracts
Digital Identity (Proofs), Land Titles and other Public Government Records,
University Degrees
Trade Finance, Supply Chains, Medical Records
Permissioned vs. Permissionless: Who can write to a Blockchain (participation)Public vs. Private: Who can read from a Blockchain (visibility)
There is a role for government, either as publisher or regulator, in all of these.
Payments/SOV (Bitcoin, Ethereum), “Distributed
Autonomous Organizations”
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An Adaptive Path Forward?Legislation / Regulation:
● Focus on the function rather than its implementation.● Be a stakeholder in governance models – not the governing body itself.● Reinvent role of regulator as a standards-setting consumer/adopter.
As a Consumer/Adopter:
● Establish center of competency/excellence to guide projects and procurement criteria/selection (i.e. be a smart buyer).
● Avoid vendor capture and lock-in at all levels.