currencies – How can I get a new Bitcoin exchange up and running?

Your initial concern should not be with the technological aspect of a Bitcoin exchange, but with a legal one. You shouldn’t aim to start a service that would in the end be deemed illegal in the countries you operate, or have servers in. There was a polish exchange that closed down as its owner didn’t want to deal with potential gray areas of local law in regards to running such an exchange.

Then, you should keep in mind the business aspect of things – how will you get money in and out of your exchange and who you will be working with. There have been a couple exchanges like TradeHill that closed because of problems with money flow.

Only having such aspects covered should you deal with the software part of starting an exchange.

currencies – How to know if I have profit based on bid and ask

So i’m really new into this crypto thing so my question is , supposing that i have bought 1 BTC at some market price, I wanna how it is known if should i buy or sell my assets based only on the current ask and bid values of the BTC-USD rate. How can i infer that based only on those values?

Thank you in advance :]

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Warning Newbie: How does a Ledger hold multiple currencies?

So you startup your ledger, copy down your 24 words, and you now have a public and private key. (I think). Now you add the BitCoin App to your Ledger and you can add BTC to your “hardware wallet” using those keys. (Though phrasing it that way is a bit of a misnomer since the only thing your Ledger ever really stores is your private/public keys.)

So far so good for one currency. However, a Ledger will hold multiple currencies. That I can find there is no asking for another 24 words. You just add the second app and you now have a wallet in that new currency. So I assume that means that if you purchase Ethereum coins it is going to use the same public/private keys that you used on BitCoin?

That would also imply that you cannot have two BitCoin wallets on the same Ledger because attempting to do so wouldn’t make sense without a second set of keys which the Ledger doesn’t have.

Is what I am saying correct?

Frank

python – Ripple get_payments does not work for all currencies

Get_payments API call https://xrpl.org/data-api-v2-tool.html#get-payments says that if the currency field is left blank, up to 1000 payments of that day will be returned. However, the API returns 404 for a blank field, or if we exclude the currency field altogether.

api = RippleDataAPIClient('https://data.ripple.com')

Works 1: query_params = dict(currency='BTC+r9qdKsVyeSTc9P5mDP4s7qucQaLrhTfPcv', limit=1000,descending='true',start=begin.strftime('%Y-%m-%dT%H:%M:%SZ'),end=end.strftime('%Y-%m-%dT%H:%M:%SZ'))

Works 2: query_params = dict(currency='XRP', limit=1000,descending='true',start=begin.strftime('%Y-%m-%dT%H:%M:%SZ'),end=end.strftime('%Y-%m-%dT%H:%M:%SZ'))

Fails 1: query_params = dict(currency='', limit=1000, descending='true',start=begin.strftime('%Y-%m-%dT%H:%M:%SZ'),end=end.strftime('%Y-%m-%dT%H:%M:%SZ'))

Fails 2: query_params = dict(limit=1000, descending='true',start=begin.strftime('%Y-%m-%dT%H:%M:%SZ'),end=end.strftime('%Y-%m-%dT%H:%M:%SZ'))

blockData = api.get_payments(**query_params)

Does anyone know how to use get payments without specifying a currency, as advertised?

binance: the purpose of USDT (and other stable currencies)?

Any institution that trades cryptocurrencies is not classified as a financial institution by definition. Therefore, any cryptocurrency related exchange only it is not subject to financial regulation and control (just like in-game currency and computer games). However, I suspect that if an exchange lists BTCUSD or BTCEUR, then they are dealing with a currency issued and regulated by a central bank and therefore subject to financial regulation.

I am correct in concluding that the purpose of currencies reflecting the real world currency, such as the USD, is to allow an exchange to deal exclusively with cryptocurrencies and to avoid falling into the realm of financial regulation, but to have a cryptocurrency (in this case, USDT) that is closely linked to a real world economy (US and world economy)?

What currencies and cryptocurrencies are supported by the alpha advantage?

https://www.alphavantage.co/

I tried to find his list and I couldn't find it.

USD, EUR, IDR, ZAR, seems standard. However, I can't see where they were listed at all.

I think I saw that somewhere. I used your API. I wonder where it is

How to adapt the Bitcoin Core wallet to receive, store and spend alternative currencies based on Bitcoin Core?

When creating an altcoin based on Bitcoin Core:

To which address can the extracted coins be sent?

To a classic Bitcoin Core wallet?

Or should the wallet provider make certain modifications to the wallet code in order to receive, store and spend these new altcoins based on Bitcoin?

How to adapt the Bitcoin Core wallet to receive, store and spend alternative currencies based on Bitcoin Core?

When creating an altcoin based on Bitcoin Core:

To which address can the extracted coins be sent?

To a classic Bitcoin Core wallet?

Or should the wallet provider make certain modifications to the wallet code in order to receive, store and spend these new altcoins based on Bitcoin?

Dynamic programming: problem of changing minimum currencies with limited currencies

I have been assigned the problem of changing minimum coins for the task. I have to calculate the least amount of coins needed to make a change for a certain amount of pennies in 2 scenarios: we have an infinite supply of coins and also where we only have 1 of each coin. I could quickly implement the solution for the first scenario using a recursive formula from here, but I could not find a recursive formula for the second case and instead I came up with an iterative solution.

We can add all possible combinations of coins, check and see if the sum is equal to the desired objective and compare the amount of coins used with the lowest current amount of coins. I also realized that I can use the binary count to simulate all possible combinations using the bits in the iterator as a coefficient (either 1 or 0) for each coin and then calculate the weight of Hamming to verify how many coins were used in the sum.

To display an example with 3 coins:

C1 C2 C3 | S                        | W
 0  0  0 | 0 * C1 + 0 * C2 + 0 * C3 | 0
 0  0  1 | 0 * C1 + 0 * C2 + 1 * C3 | 1
 0  1  0 | 0 * C1 + 1 * C2 + 0 * C3 | 1
 0  1  1 | 0 * C1 + 1 * C2 + 1 * C3 | 2
 1  0  0 | 1 * C1 + 0 * C2 + 0 * C3 | 1
 1  0  1 | 1 * C1 + 0 * C2 + 1 * C3 | 2
 1  1  0 | 1 * C1 + 1 * C2 + 0 * C3 | 2
 1  1  1 | 1 * C1 + 1 * C2 + 1 * C3 | 3

Obviously, we can omit the case where all the coefficients are 0, but to complete (when target = 0) and simplicity I have kept it in the solution.

My implementation in Python is:

import math


def least_coins(coins, target):
    least = math.inf

    # loop all 2^n possible sums of coins
    for i in range(2 ** len(coins)):
        sum = 0

        # add all the coins multiplied by their coefficient in this iteration
        for j in range(len(coins)):
            # get the j-th bit in i
            coefficient = i >> j & 1
            sum += coefficient * coins(j)

        if sum == target:
            count = 0
            # calculate the Hamming Weight of i to determine the number of coins used
            while i:
                i &= i - 1
                count += 1
            least = min(least, count)

    return least


coins = (3, 1, 1, 3, 2, 4)
target = 10
print(least_coins(coins, target))
>>> 3
# 3 + 3 + 4 = 10

As you can see, coins are not necessarily unique, but can only be used once. How can I turn this into a recursive formula (if possible and for the reason of possibly being able to optimize it using dynamic programming) or even introduce coefficients other than 0 and 1 so that the problem can be more general when we have a certain amount of each currency ?