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Possible to Generate a QR with a Specific Number of Sats to Coinos Address?
157 sats \ 8 comments \ @spiderman 23 Jul bitcoin_beginners
So, I signed up for a coin-os account, and got a lightning address looking like <username>.coinos.io, along with the corresponding QR code.
I am planning to deliver some lessons, and will accept Bitcoins as fees. Is it safe to attach the QR code with the flyers I distribute? If a customer pays by scanning the QR code, will the Sats land in my coinos account?
Further, is it possible to embed the amount (100, 000 Sats, for example) with the QR code, like a lightning invoice? I do not see any option to do that in coinos. Absent this feature, the customer has an additional responsibility to key in the amount he is paying.
Alternatively, I have two options
  • Generate a unique lightning invoice using my lightning wallet manually for each customer, which does not seem like a scalable idea.
  • Attach the amount 100,000 Sats to my on-chain P2WPKH address
The resources I have are
  • An on-chain wallet
  • The block-stream green app which supports lightning
  • The coinos account
I am happy to get my Sats in any of these, but which ones are easiest/cheapest for customers to pay (the ones that do pay with Sats)? It's a small scale thing, so do not want to sign up for some kind of professional third party service just to take Sats payment.
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0 sats \ 4 replies \ @OT 23 Jul
That static QR will be OK for people sending payments to your Coinos account. You will have to get the students to input their name in the invoice to know that it was them sending sats.
I don't think a static 100k sat invoice is possible. You will need to generate one every time.
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0 sats \ 3 replies \ @spiderman OP 23 Jul
I scanned my own Coinos QR code with the Blockstream green android wallet. The user journey was like
  • Open the send screen
  • Scan the QR code, the address <user>@coinos.io populates in the address box
  • enter the amount (something I wish I could avoid)
  • slide to send
Sure enough, the Sats landed within a minute. But it does not look like there is a way for the sender to add any metadata that is visible to the user. The only common field visible on both sides is what they call the payment preimage, which is a long incomprehensible string like 9f44..249c, which I can use to identify the sender.
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0 sats \ 2 replies \ @OT 23 Jul
The sender should be able to add a message.
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0 sats \ 1 reply \ @spiderman OP 23 Jul
A wallet specific feature? So far as I can see, Blockstream does not have a field to enter a message. Am curious how exactly are you sending it that allows you to add a message?
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0 sats \ 0 replies \ @OT 23 Jul
It should be in all LN wallets. Here's what it looks like in Coinos.
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0 sats \ 0 replies \ @satgoob 23 Jul
Or try it with your own coinos accounts and make multiple
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0 sats \ 1 reply \ @satgoob 23 Jul
Try posting the static QR image here as an attachment and have 2+ people confirm it works
Set it to 5 sats so I don’t go broke lol
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0 sats \ 0 replies \ @spiderman OP 23 Jul
Thanks, I just tested from my own Blockstream wallet to the coinos account, and the transaction went smoothly.
So seems it will work, but I have to leave the option of entering number of Sats to the recipient.
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