texts: What to do when funded channel node disappears

texts:
I would like to test this scenario on a testnet.

I funded a channel with one testnet node.

Assume that node suddenly vanishes and doesn't come back up for, say, another 4 weeks, or never.

What is supposed to happen? How am I supposed to detect and react to this?


texts: How bitcoin distributed to more than 1 miner as bitcoin-mining lottery only choose 1 miner?

texts:
newbie here.

As my understanding, many miners are working on hashing a block, any more than 1 miners could get the correct solution. But according to the "lottery" principle, only 1 miners will found the block, add it to blockchain and receive the reward.

My question is, why do a single miner with a single CPU can get small amount of BTC (like 0.00000x btc/day) since we cant compute with strong computing power and there is only 1 winner, he/she should receive completely 25 btc.

Is my understanding on "mining" incorrect?
Appreciate if anyone could answer :)


texts: How do I get credentials on the bitcoin network?

texts:
I'm setting up an LND node so I can learn about Lightning Networks. I apparently need a set of user credentials so that I can connect to the network.

How do I get the credentials that I need to set this up? Is it possible for an average user who is just trying to learn about LND?

Ideally I would like to connect to the main net, so that I can connect my Zap wallet to it.

I have to fill in these values in the config:

bitcoind.rpcuser=bitcoind_rpc_user_string
bitcoind.rpcpass=bitcoind_rpc_password_string

Also can someone explain these settings to me:

bitcoind.zmqpubrawblock=tcp://127.0.0.1:18501
bitcoind.zmqpubrawtx=tcp://127.0.0.1:18502

Is 127.0.0.1 ok to leave for these values?

Thanks