Add scripts and bridge design draft

docs/bridge_design.md

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+Prover proves that:
+- gave every withdrawal requests BTC from their own capital.
+- moved remaining capital to the next BitVM instance.
+
+Verifier should be able to slash the prover if:
+Prover didn't make the specified tasks in 6 days
+
+
+If prover fails to give the prove by the time:
+- lost his stake
+- lost the connector output so can't steal bridge money.
+
+Make a bitcoin transaction
+
+UTXO 1:
+Paul's Stake, 10 BTC
+
+UTXO 2:
+Vicky's Stake, 1 BTC
+
+3 Outputs:
+Output 1:
+Vicky's Challenge Root, 0 BTC
+
+Output 2:
+11 BTC
+2-of-2 Multisig
+or
+Paul Takes in 7 Days
+or
+Vicky Slashes equivocation
+
+Output 3:
+0 BTC
+Connector output
+2-of-2 Multisig
+Paul Takes in 8 Days (7 Days + challenge response protocol)
+
+Paul also gives signatures for spending connector output for every step at challenge response protocol.
+
+Depositor puts money to the 2-of-2 multisig by the prover and depositor
+Gives 2*(Total number of rounds) signatures:
+- spend the deposit with connector output to the provers address
+- spend the deposit to the next 2-of-2 multisig.
+- spend the second multisig with second connector output to the provers address
+- spend the seocond multisig to the next 2-of-2 multisig
+...
+
+
+Questions:
+Can SIGHASH_ALL | SIGHASH_ANYONECANPAY be used?
+Can we add delayed upgradability?

regtest-commands.sh

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+#!/bin/bash
+
+bitcoin-cli -regtest -rpcuser=admin -rpcpassword=admin createwallet "admin";
+
+bitcoin-cli -regtest -rpcuser=admin -rpcpassword=admin generatetoaddress 101 $(bitcoin-cli -regtest -rpcuser=admin -rpcpassword=admin getnewaddress);
+
+while true
+do
+    bitcoin-cli -regtest -rpcuser=admin -rpcpassword=admin generatetoaddress 1 $(bitcoin-cli -regtest -rpcuser=admin -rpcpassword=admin getnewaddress)
+    sleep 1
+done