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Best solution for backend BSV hot-wallet

I am looking for a solution to implement a backend hot wallet. It needs to be able to spend pretty much instantly upon API call. The refilling of the wallet can happen manually, but it needs a way to generate a new address and output it somehow so I can refill it. Bonus points if the backend wallet has a way to resolve paymail addresses. Bonus points for links to the respective library. Also helpful to know which proprietary systems exist which could be contacted to see if their system could be leveraged.

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How do Bitcoin payment channels work?

I would like to know how payment channel mechanic works in practice. What do the involved parties need to do, which information they exchange and how is the security ensured.

Bonus question: What different types of payment channels exist?

Only answers that actually explain channels will qualify for the bounty. While linking to 3rd party sources is encouraged and desired, answers that solely do that won’t count.

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How to broadcast a transaction to the Bitcoin Peer-to-peer network?

Let’s say a developer wants to broadcast transactions from their app directly to the P2P network (not using RPC calls). How would this be done? I assume a TCP/IP connection needs to be established to one of the active nodes. What follows after that? Which messages need to be exchanged (examples would be very welcome)? Can connection be closed after the broadcast or should the app maintain its connection?

Bonus question: How to discover other nodes and broadcast the transaction to multiple peers in parallel?

Is there any curated list of the IP addresses of the nodes that belong to major miners?

EDIT: It is true that Merchant API will be the way to go when available (it is not at the moment) and that using APIs such as Matter Cloud or What’s on chain is the easiest way to do it right now. But this question is more about understanding how Bitcoin’s server network works. It is an interesting piece of technology. It might also be useful for someone - API providers need to deliver transactions to miners at some point after all.

With that said; this question remains open and bounty still waiting for the right response.

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Is there a @money_button signup template I can use on my page for people to receive one of my tokens, either for my newsletter, membership or services offered?

I would like to introduce my stakeholders to a signup process into our bitcoin systems and I would like to have a landing page where I could make my own moneybutton signup process to receive the MBID in my system in order to send a token for that specific signup part. My goal would be have follow up ages where they provide more and more information for the exchange of API information tokens. Questions: Could it be tokens with a unique identifier that can only be used with the owner of MBID and associated tokenID in order to progress to the next page? In what way could a datapoint be statistically useful and still keep its full privacy? Each interest group like opensource@moneybutton.com is initiated and funded with $ 50 as ideating tokenholder under thefastcompany@moneybutton.com.

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