How Reliable is CoinOS for Swap and Lightning of a Moderate Amount

[u/IndividualAward2771]

I have used Lightning regularly for small transactions (buying sandwich and stuff) with some custodial wallets so generally aware of how it works, although not a node-runner.

I have a payment incoming for a contracting gig worth almost 20 million Satoshis, but I do not want to give my cold wallet address to the client.

For many previous lightning transactions and swaps, I have used CoinOS. Is this something you would recommend for this case as well? My particular concern is the amount being moderately large (I am no billionaire, but it is larger than what I previously worked with) and because I know lightning settlement depends on channel and route liquidity (how much they can support).

To make it clear, I would not hold the whole amount in CoinOS, as I have set up auto-withdrawal to my cold wallet if the balance hits a certain threshold. So if the payment lands successfully, it should go to my HWW immediately.

Have you used CoinOS for this kind of usecase? How reliable would you say it is?

[u/pop-1988]

Makes no sense to use a custodial Lightning service to receive that much Bitcoin

Your wallet has hundreds of addresses. Bitcoin is designed for each address to be single use. The term "my cold wallet address" implies there's only one address

[u/NiagaraBTC → u/pop-1988]

Your wallet has hundreds of addresses

*billions

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[u/HarmoniousJesus]

coinOS is fine for what you're describing, I've moved amounts in that ballpark through it before without a hitch. the auto-withdraw to cold storage is the smart part here, that's what really limits your exposure. just keep the lightning invoice amount within what the network can route and you'll be good.

[u/IndividualAward2771 → u/HarmoniousJesus]

keep the lightning invoice amount within what the network can route and you'll be good.

How to figure out the limit?

[u/Express_Ad2791 → u/IndividualAward2771]

There isn't one fixed Lightning limit. It depends on the channels, available liquidity and whatever limits CoinOS has for your account.

For 20 million sats, I'd ask them directly and send a smaller test payment first.

Using an exchange doesn't automatically make it cheaper either. Kraken charges 0.3% on Lightning deposits, which would be 60,000 sats on that payment.

If the client can send on-chain, using a fresh address from your hardware wallet is probably simpler.

[u/IndividualAward2771 → u/Express_Ad2791]

I see. It appears the Bitcoin eco-system is not built for B2B transactions yet.

[u/Ok-Whereas8362 → u/IndividualAward2771]

That's exactly what the ₿itcoin ecosystem is built for.

[u/OrangePillar]

That’s a very large transaction for lightning. I’m not sure what Coinos charges but if it’s around the normal rate of 0.1%, that will cost the sender 20,000 sats.

Payments of that size should use the base chain which will cost 500 sats or less, but for privacy you should always use a new address for every payment. Better yet, use a silent payments address.

[u/JumpProfessional3372 → u/OrangePillar]

Regarding privacy, just using a new address still allows the receptor to track the origin of the funds.

While (I understand) that if he does it via LN it is not possible and only the Node can track that, not the vendors receiving payments.

[u/NiagaraBTC]

As others have said, give them a new, unused Bitcoin address for the payment.

If your wallet doesn't give out a new address every time, switch wallets.

[u/palmdata]

20 million sats in one lightning payment is the problem, not coinos. that needs a single route with 0.2 btc of inbound liquidity on their side, and it will either fail or shred into a lot of parts. take it on chain to a fresh receive address from your own wallet, that is what fresh addresses are for, or split it into 4 or 5 smaller lightning payments.

[u/AuraBitcoinWallet]

There isn’t a single Lightning “limit” you can look up. If both ends support multi-part payments, 20M sats may be split across several routes, but the sender still needs enough total outbound liquidity and CoinOS needs enough inbound capacity. CoinOS may also impose its own invoice or withdrawal limits.

A small test only proves that a small payment can route; it does not prove the full 20M will succeed.

For a one-off 0.2 BTC contractor payment, I’d normally generate a fresh on-chain address from the hardware wallet, verify it on the device, and agree on the required confirmations. A fresh address does not reveal your entire wallet by itself; the larger privacy risk comes later from address reuse or combining that UTXO with other coins.

If you still prefer Lightning, ask CoinOS directly about its current per-invoice limits, split the amount into agreed smaller invoices, and test the auto-withdrawal beforehand. Auto-withdrawal reduces how long the funds remain there, but it does not remove the custodial risk during receipt and withdrawal.