In the US, we have limited options to buy/sell cryptocurrency by linking our bank accounts:

• 1. https://coinbase.com and https://gemini.com. They have the custody of your coins.
• 2. https://abra.com. semi-custodial. They have synthetic coins.
• 3. https://evercoin.com. non-custodial. Your keys, your coins. You can link your bank account. Currently cheaper than all other options but only available in 9 US states: "CA", "MA", "NV", "MI", "MO", "MT", "NE", "UT", "WY"

Regardless of your choice, bank transactions (ACH) take time. Actual transfer happens at midnight every business day and the settlement takes a few days. So USD withdrawal from any of these options will take at least one business day. Deposits can take up to 6 days because the company will have to wait for the bank transaction settlement and banks don't work during the weekend. If you do your transaction before 5pm you will save yourself a day.The worst time is Thursday after 5pm and Friday because the bank transaction will wait through the weekend.

And that is one of the many reasons why we have to make sure bitcoin (cryptocurrency) wins and we won't need banks. It is insane.

Hi,

With the privateKey: 619c335025c7f4012e556c2a58b2506e30b8511b53ade95ea316fd8c3286feb9
which gives me the publicKey: 025476c2e83188368da1ff3e292e7acafcdb3566bb0ad253f62fc70f07aeee6357
I am signing the following message:
c37af31116d1b27caf68aae9e3ac82f1477929014d5b917657d0eb49478cb670

The signature I create is always (repeatable):
304502203609e17b84f6a7d30c80bfa610b5b4542f32a8a0d5447a12fb1366d7f01cc44a022100a 8c56ab3bae7ccea9ebf906fcff170cb61b9c3bddb0c7f1133238e5ee9b75553

which is different from the one at https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki#Native_P2WPKH:
304402203609e17b84f6a7d30c80bfa610b5b4542f32a8a0d5447a12fb1366d7f01cc44a0220573 a954c4518331561406f90300e8f3358f51928d43c212a8caed02de67eebee

I can verify that the message is valid with both signatures (mine and the one on the website).

Is it normal that two (or more) different signatures can be created from the same privateKey & message? If so why? If it is because of the randomness feature of the ECDSA then why do I create the exact same signature -everytime- I ran the signing code with the same private key & message above?