Blockchain

Neural Network based Blockchain

links:

1. [Complete Block explanation]: https://en.bitcoin.it/wiki/Dump_format#CBlock
2. obtain Test-net coin: https://coinfaucet.eu/en/btc-testnet/
3. Tracking transaction hashes: https://live.blockcypher.com/btc-testnet/

BLOCKS

Problem faced:

ASG1:

1. Setup could not do in 1st attempt.
2. Could not relate the input in ex1.py with that to be put in blockcypher online.
3. Integer format of BTC to be kept in

Solution

 Private key: cPoTjeTeZfWKycFMktDvimL3Dn4h3VL39xfkC9gA7Bb4Fc94i1Lx
 Address: mgZMyfSQvNtQCEiFuZdn3ASmzpwmEeQMct
 tx: 63c1468145ea08fd0f7877b84e849b028a0c11a149c971d125ecddc4a378d26a

bitcoin

1.Transactions:

Challenges:

1. Verification of Double-Spend(Multiple signing of the same block) check on Transactions

Solution:

     1. The Transactions should use third-party for verification.
     2. The majority of nodes agree with the received transaction is first by the following Payee. 

2.Timestamp Server:

Solution for Double-Spend:

1. The timestamp attached indicates that the Transaction would have been signed at some earlier timestamp.

3.Proof-of-Work:

Target:

1. Increase difficulty for Proof-of-Work so that the transactions stored in blocks by each node could be 
   allowed to passby other participating nodes.

Solution for:

1. Determining representation in majority decision making.

Challenges:

1.If 1-IP 1-Vote given for majority, multiple IPs comes into picture by a single client.
2.The compensation in hardware speed and varying in interest of speed of blocks for nodes 
  leads to difficulty of Proof-of-Work(PoW).  

Solution:[Dominancy][Super-admin concept creation]

1. 1-CPU-1-Vote: CPU power allocation to the one-honest node reduces capability of adversary nodes by CPU-power.
2. For decremention of PoW for hardware speed of honest node, there is fixing of average nos. of blocks per hour. 

4. Network Setup:

Principles:

1. Longest chain of blocks are acceptable.
2. #Creation:The node finding best and soonest Proof-of-Work, i.e, honest node, transfers block 
   with hashes to every node. The nodes accept it only with no blocks are spent(doubly signed).
3. #Acceptance:The other node on getting PoW for the block passing through it, add an extra block 
   to the chain with hash generated using hashes from the previous block w.r.t it.
4. #Rejection:If any block in the chain found not validating PoW, the complete chain is rejected.
5. #Tie:Throughout the process, there could be more than a chain running throughout the nodes. If
   2nd time PoW is found,the 'Tie' among multiple break and it follows longer chain out of existing.
6. The new blockchain must not be passing by all the nodes again. The nodes not getting the chain
   raise request for the chain.

5. Incentive:
6. Reclaiming Disk Spaces:
7. Simplified Payment Verification:
8. Combining and Splitting Values:
9. Privacy: 10.Calculation: