There are cases in which you need to use port 53, like to usednsmasq, dns server etc. which is used by systemd-resolved. to get rid of systemd-resolved safely

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  1. stop systemd-resolved “ sudo systemctl stop systemd-resolved”
  2. edit /etc/systemd/resolved.conf with these
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[Resolve]

3) sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf

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And done !!


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Start geth with rinkeby chain

  1. Download Rinkeby json https://www.rinkeby.io/rinkeby.json
  2. Initialise datadir geth — datadir=$HOME/.rinkeby init rinkeby.json
  3. connect node to rinkeby network and start
geth --networkid=4 --datadir=$HOME/.rinkeby --cache=1024 --syncmode=full  --bootnodes=enode://a24ac7c5484ef4ed0c5eb2d36620ba4e4aa13b8c84684e1b4aab0cebea2ae45cb4d375b77eab56516d34bfbd3c1a833fc51296ff084b770b94fb9028c4d25ccf@52.169.42.101:30303

4. start ethereum wallet

/Applications/Ethereum\ Wallet.app/Contents//MacOS/Ethereum\ Wallet — rpc $HOME/.rinkeby/geth.ipc

5. Install truffle

npm install -g truffle

6. Initialize truffle

truffle init

after initialising truffle write you contract code and deploy using truffle commands


To add self signed certificates in macOS Sierra for testing, you need to create root CA certificate signed with SHA256

openssl req -x509 -nodes -sha256 -days 365 -newkey rsa:2048 -keyout localhost.key -out localhost.cert

and add it to System keychain using

sudo security add-trusted-cert -d -r trustAsRoot -k /Library/Keychains/System.keychain


btcd is an alternative full node bitcoin implementation

Running docker container of btcd

  1. Install Docker, you can follow docker installation guide from here https://docs.docker.com/engine/installation/
  2. Pull docker btcd image docker pull niktrix/btcd-docker
  3. create directory to mount to docker container where btcd will download all blocks data, assure you have enough disk space mkdir /btcroot
  4. run btcd image as daemon docker run -d -p 8333:8333 -v /root:/btcdroot — name=”btcd-node” niktrix/btcd-docker
  5. check logs docker logs btcd-node
  6. Your node will download all blocks it will take some time depending on your network connection
  7. Make sure your port 8333 and check your node status https://bitnodes.21.co/


  1. Bitcoin mining is different than running bitcoin fullnode, there is no incentive involved in running bitcoin full node

2. in layman term you can think bitcoin full node is like seeding your torrent.

3. As seeding in torrent helps to maintain health of file in torrent, running full node helps in bitcoin network health.

4. Bitcoin Full node downloads all blocks and it verifies all blocks hash to its previous block,

5. As full node verify all blocks and you are the owner, you can blindly trust data of your full node.

6. Various bitcoin implementation are available like bitcoinecore, bitcoind, btcd


Blockchain is underlying technology used in cryptocurrencies, before you start reading about blockchain there are some prerequisite to read,

  1. distributed computing
  2. consensus algorithms
  3. hashing functions
  4. byzantine fault tolerance
  5. peer to peer network
  6. state machines
  7. Distributed blocks
  8. Merkle Tree

About

Nitin Gurbani

Argumentative. Opinionated. Always right. . Drinker. love Fun, knowledge greedy .

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