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Sunday, December 12, 2021

Multichain : Appending Data to Blockchain with DATA STREAMS

 
MultiChain streams enable a blockchain to be used as a general purpose append-only database, with the blockchain providing time stamping, notarization and immutability. This video continues from the earlier video post in playlist and now focuses on populating data in the "nutsbolts" blockchain created earlier. 
 
Erstwhile seen node "A" creates a data stream data1, populates some sample data, which is immediately visible in the other node "B". Node A further grants exclusive permissions to Node "B" for send and writing to data stream data1. The complete demonstration is shown on two separate Linux machines as introduced in M-1 and M-2 videos in Multichain playlist i.e. Node A and Node B. data stream created name: "data1" 
 
 Commands used
 
create stream data1 '{"restrict":"write"}' 
 
listpermissions data1.* publish data1 key1 '{"json":{"name":"kabali","city":"chennai"}}' 
 
liststreams 
 
subscribe data1 
 
liststreamitems data1 
 
grant 1...send 
 
grant 1...data1.write 
 
publish data1 key2 '{"json":{"name":"baasha","city":"mumbai"}}' 
 
subscribe data1 
 
liststreamitems data1 
 
liststreamkeys data1 
 
liststreamkeyitems data1 key1 
 
liststreampublishers data1 
 
liststreampublisheritems data1 1...

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