Dimitri De Jonghe presents on how Bigchain DB can use Interledger to connect disparate systems. Presented at the Interleder Workshop in London on 7/6/2016. Full presentation here: https://interledger.org/presentations/2016-07-06%20-%20ILP%20Workshop%20London%202016.pdf

1. Weaving the ILP fabric into
BigchainDB
Dimitri De Jonghe

2. BigchainDB 101
Assets & Crypto-Conditions
BigchainDB Ledger Plugin

3. Throughput
>1,000,000 writes/s
~100,000 transactions/s
Latency
<100 ms
Capacity
Petabytes with each
node adding 48TB
Query
Database is fully
queryable
Scalability
Performance increases as
nodes are added
Decentralization
Federated
non-anonymous participation

4. Blockchain-ify big data
Retain big-data performance
Ordering of events by PAXOS-like solver
Natural ordered log of transactions
Add blockchain characteristics
Decentralization
Federated voting on transactions
Group into blocks for speed
Immutability
Hash on prev. blocks
Append only!
Assets
Digital signatures and other trapdoor functions

5. RethinkDB
Cluster
Architecture
BigchainDB
Federation
Alice
Bob
Blockchain consensus
Byzantine actors -> quorum
_________________
Big data consensus
RAFT -> strong consistency
_________________

6. Decentralization of the Cloud
Proc’ing
FS Dec.
DB/Ledger
Partly Dec. Apps
Proc’ing
FS DB
Apps
Dec. Proc’ing
Dec. FS Dec.
DB/Ledger
Dec. Apps
Centralized
Partly
Decentralized
Fully
Decentralized

7. BigchainDB 101
Assets & Crypto-Conditions
BigchainDB Ledger Plugin

8. Transaction chain
Append only

9. Assets
____
Currency
____
(In-)tangible assets
____
Digital content/licenses
____
Supply chain

10. Assets with crypto-conditions
Turing completeness
private-publickey
multi-signatures
crypto-conditions
smart-contracts

11. {
"id":"933cd83a419d2735822a2154c84176a2f419cbd449a74b94e592ab807af23861",
"transaction":{
"conditions":[{
"cid":0,
"condition":{
"details":{
"bitmask":32,
"public_key":"BwuhqQX8FPsmqYiRV2CSZYWWsSWgSSQQFHjqxKEuqkPs",
"signature":None,
"type":"fulfillment",
"type_id":4
},
"uri":"cc:4:20:oqXTWvR3afHHX8OaOO84kZxS6nH4GEBXD4Vw8Mc5iBo:96"
},
"new_owners":["BwuhqQX8FPsmqYiRV2CSZYWWsSWgSSQQFHjqxKEuqkPs"]
}],
"data":{
"hash":"872fa6e6f46246cd44afdb2ee9cfae0e72885fb0910e2bcf9a5a2a4eadb417b8",
"payload":{"msg":"Hello BigchainDB!"}
},
"fulfillments":[{
"current_owners":["3LQ5dTiddXymDhNzETB1rEkp4mA7fEV1Qeiu5ghHiJm9"],
"fid":0,
"fulfillment":"cf:4:Iq-BcczwraM2UpF-TDPdwK8fQ6IXkD_6uJaxBZd984yx…",
"input":None
}],
"operation":"CREATE",
"timestamp":"1460981667.449279"
},
"version":1
}
Assets with crypto-conditions
condition = cc.Ed25519Fulfillment()
condition.public_key = “BwuhqQ...”
# optionally provide condition structure
condition.to_dict()
condition.condition_uri
fulfillment =
input.conditions[0].from_dict()
fulfillment.sign(message, private_key)
fulfillment.serialize_uri()

12. {
"id":"933cd83a419d2735822a2154c84176a2f419cbd449a74b94e592ab807af23861",
"transaction":{
"conditions":[{
"cid":0,
"condition":{
"details":{
"bitmask":32,
"public_key":"BwuhqQX8FPsmqYiRV2CSZYWWsSWgSSQQFHjqxKEuqkPs",
"signature":None,
"type":"fulfillment",
"type_id":4
},
"uri":"cc:4:20:oqXTWvR3afHHX8OaOO84kZxS6nH4GEBXD4Vw8Mc5iBo:96"
},
"new_owners":["BwuhqQX8FPsmqYiRV2CSZYWWsSWgSSQQFHjqxKEuqkPs"]
}],
"data":{
"hash":"872fa6e6f46246cd44afdb2ee9cfae0e72885fb0910e2bcf9a5a2a4eadb417b8",
"payload":{"msg":"Hello BigchainDB!"}
},
"fulfillments":[{
"current_owners":["3LQ5dTiddXymDhNzETB1rEkp4mA7fEV1Qeiu5ghHiJm9"],
"fid":0,
"fulfillment":"cf:4:Iq-BcczwraM2UpF-TDPdwK8fQ6IXkD_6uJaxBZd984yx…",
"input":None
}],
"operation":"CREATE",
"timestamp":"1460981667.449279"
},
"version":1
}
Transaction malleability
fulfillment =
input.conditions[0].from_dict()
fulfillment.sign(message, private_key)
fulfillment.serialize_uri()

13. Tracking the story of 3 assets

14. Other crypto-conditions
BigchainDB supports crypto-conditions natively:
● Hashlocks: Preimage-SHA-256
● Signatures: Ed25519
● Threshold: complex branches possible
Python version for crypto-conditions @
https://github.com/bigchaindb/cryptoconditions
>pip install cryptoconditions

15. “Experimental” crypto-conditions
BigchainDB append only, how to provide escrow?
if timeout_condition.validate(utcnow()):
execute_fulfillment.validate(msg) == True
abort_fulfillment.validate(msg) == False
else:
execute_fulfillment.validate(msg) == False
abort_fulfillment.validate(msg) == True

16. “Experimental” crypto-conditions
Timeout-condition
now() < expiry_time
Inverter
if fact == True: output = False

17. Utils for crypto-conditions
JSON/dict serialization:
to_dict(), from_dict()
Queryability of complex branches:
get/update/insert/remove subconditions
get_subcondition_path_for_type(type_id):
…
return subcondition, indices
fulfillment.subconditions[indices[0]]['body']
.subconditions[indices[1]]['body']
.subconditions[indices[2]]['body']

18. BigchainDB 101
Assets & Crypto-Conditions
BigchainDB Ledger Plugin

19. BigchainDB web stack
API websocket
ilp-plugin-bigchaindb / <your_app>

20. BigchainDB Ledger Plugin
connect()/disconnect()
Connect to a BigchainDB API + websocket
getBalance()
Retrieve the number of assets for an account
send(transfer)
Local ledger escrow
fulfillCondition(transfer, conditionFulfillment)
Fulfill the execute branch of the escrow
getConnectors(): <example-specific>
Get accounts with multi-ledger connections

21. Demo!

22. Hackaton Proposals
• Challenge: Payment system + Fungible
Assets
• Idea: Pay as you stream platform
– 1 StreamCoin = Y dollars
– 1 StreamCoin = X time units of streaming

23. When Alice wants to listen to music...
Alice $0.5
Escrow 0
StreamCoin 0
StreamCoin 1
Escrow 0
PAYS 0
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