Geth Testnet Configuration

Obscuro.json (note that extraData contains both sealer addresses)

{
  "config": {
    "chainId": 888,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "clique": {
      "period": 5,
      "epoch": 30000
    }
  },
  "nonce": "0x0",
  "timestamp": "0x61ad4c01",
  "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000d19e492703fe21f9c26d7675a0e170b3690e6b2edadc65b1bdfae96f9cf04a8d49f3087ddd4a13b00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "gasLimit": "0x47b760",
  "difficulty": "0x1",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "alloc": {
    "d19e492703fe21f9c26d7675a0e170b3690e6b2e": {
      "balance": "0x200000000000000000000000000000000000000000000000000000000000000"
    },
    "dadc65b1bdfae96f9cf04a8d49f3087ddd4a13b0": {
      "balance": "0x200000000000000000000000000000000000000000000000000000000000000"
    }
  },
  "number": "0x0",
  "gasUsed": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "baseFeePerGas": null
}

For Bootnode:

~/go/bin/bootnode -nodekey bootnode.key -verbosity 4 -addr 127.0.0.1:30301

Output:

enode://6791c3219031b1b733d1782fded16de3d6e329e8e83d0d0ef3f306b331b2d904607efca281915b05d5ade1e8702af230bb559d26f7a0e442c3f4193c20bdfa0d@127.0.0.1:0?discport=30301

For Node 0:

rm -rf node-1/data/geth/
rm -rf node-1/data/history
~/go/bin/geth init obscuro.json --datadir node-1/data/

~/go/bin/geth 
--datadir node-0/data 
--syncmode full 
--networkid 888 
--mine --miner.threads 1 --unlock 0 --password node-0/data/password.txt --allow-insecure-unlock 
--port 30303 
--http --http.addr 127.0.0.1 --http.port 8083 
--verbosity 3 
--snapshot=false 
--bootnodes "enode://6791c3219031b1b733d1782fded16de3d6e329e8e83d0d0ef3f306b331b2d904607efca281915b05d5ade1e8702af230bb559d26f7a0e442c3f4193c20bdfa0d@127.0.0.1:0?discport=30301" 
console

This worked:

~/go/bin/geth 
--datadir node-0/data 
--syncmode full 
--networkid 888 
--mine --miner.threads 1 --unlock 0 --password node-0/data/password.txt --allow-insecure-unlock 
--port 30303 
--http --http.addr 127.0.0.1 --http.port 8083 
--verbosity 3 
--snapshot=true 
--nodiscover 
console

For Node 1:

rm -rf node-1/data/geth/
rm -rf node-1/data/history
~/go/bin/geth init obscuro.json --datadir node-1/data/

~/go/bin/geth 
--datadir node-1/data 
--syncmode full 
--networkid 888 
--mine --miner.threads 1 --unlock 0 --password node-1/data/password.txt --allow-insecure-unlock 
--port 30304 
--http --http.addr 127.0.0.1 --http.port 8084 
--verbosity 3 
--snapshot=false 
--bootnodes "enode://6791c3219031b1b733d1782fded16de3d6e329e8e83d0d0ef3f306b331b2d904607efca281915b05d5ade1e8702af230bb559d26f7a0e442c3f4193c20bdfa0d@127.0.0.1:0?discport=30301" 
--ipcdisable 
console

This worked:

~/go/bin/geth 
--datadir node-1/data 
--syncmode full 
--networkid 888 
--mine --miner.threads 1 --unlock 0 --password node-1/data/password.txt --allow-insecure-unlock 
--port 30305 
--http --http.addr 127.0.0.1 --http.port 8084 
--verbosity 3 
--snapshot=false 
--nodiscover 
console

Then:

admin.addPeer("enode::__node0__")