Refactor talks, add day2

1 files changed, 0 insertions, 97 deletions

diff --git a/second-talk-microservices.txt b/second-talk-microservices.txt
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-Block chain
-
-- Block chain is a database
-- Bespoke data structure
-
-"Not crpyto"
-
-General Purpose block chain:
-
-Why?
-- Data in block is immutable
-- Don't edit or remove, you append
-- traceability (Auditing / logging)
-- Verifiability (Data must be fully valid)
-- reproducibility
-- decentralisation
-- Trust-less (Removes need for trust)
-- transparency
-
-How?
-- What type?
-    - public - will be hacked
-    - shared - shared ledger
-    - private
-- Cryptography
-    - pub/rivate keys
-    - sign information
-    - verifablity
-    - Elliptic Curves
-    - openssl ecparam -list_curves
-    - Addressing
-        - can shorten public keys massively
-    - Hash algorithm
-        - Integrity
-        - 2x sha256 (sha256(sha256($data)))
-        - 4B version, 32B hash of  last Block, 32B  hash of data block, 4B timestamp, 4B difficulty, 4B nonce
-        - Merkle tree - binary hash tree
-        - Merkle path - list of hashes through the tree
-        - Genesis block - First block in the chain
-            - Special as it's first
-            - Prevents exploitation by being hardcoded
-
-- consensus
-    - Confidence
-    - chain forking needs resolution
-        - bitcoin users longest chain wins
-        - proof of work / proof of stake
-        - difficulty is no of zeros  that need to be at the start of the hash
-        - others (proof of burn, proof of time, proof of ....)
-
-
-- Smart contracts
-    - Programs that are included in the chain
-    - e.g. A loan paid by the chain
-
-- Lighting network (drawback off blockhain is it focuses on integrity not perf)
-    - Off chain transactions with on-chain settlement
-
-- Not all blockchains are chains
-    - IOTA Tangle
-
-- Challenges
-    - Fault tolerance
-        - You lose control of public/shared blockchains
-        - Now way to enforce software updates
-        - Conflict resolution
-    - Integration with current systems
-    - Security
-        - Cryptography is first and last line of defence
-
-- Not perfect for:
-    - scalability
-    - performance
-    - throughput
-
-- Incentives
-    - Mining in currencies
-        - Power for money
-- Privacy
-    - Protect data
-
-- Hard forks
-- 51% attacks
-
-- Right solution for the right kind of problem
-
-- Event sourcing on steroids
-
-QUESTIONS
-- Any php recommendations?
-    - No.
-- security?
-    - Store data not values somewhere else
-    - Encrypt
-- Why private blocks?
-    - Can give public list of hashes for verification
-    - keep data private