I am looking to buy $50 BTC for Paypal. I know my account looks new but the last one was hacked so can't help it.

While I don't plan to chargeback but to stop people from explaining it again in the comments here are the major points:
a. I am new on this forum.
b. This an Indian Paypal account. So no, I cannot send you money as F&F. All payments will be as Goods and services.
c. Goods and services payments are subjected to reversal.
d. I am new.

It seems our conclusions are quite different. There is lot of information but maybe not explained very well.

For one, Robinhood's apparent use of the word "market order" is confusing even for a non-rookie. I personally have never seen people saying market orders but actually it was a limit order. What are other exchanges/markets which does this?

Second, Robinhood not having it's own exchange market is worrying because they have to rely on latency between their platform and the connecting exchanges. So only limit orders which are far out/in the money will work well. If the  market is moving too fast this is a recipe for disaster.
On the same topic, if the exchanges are down, something which happens quite frequently, Robinhood is going to be out of commission too. So the reliability is also questionable.

This might not be as great news as every one thinks:

https://medium.com/@smith.garg/is-robinhood-crypto-really-going-to-be-zero-commission-523d22df97f4

Well they are not really an exchange.
https://techcrunch.com/2018/01/25/free-cryptocurrency-trading-app/

says:

When you place a buy or sell order, Robinhood gives you an estimated price, connects to a slew of trading venues, exchanges, and market centers to find the lowest price, and uses its economies of scale to improve to score better prices over time. To counter market volatility, Robinhood puts a “collar” around your trade so if it can’t execute it at close to the estimated price, it waits for the price to return or lets you know.

Anyone knows what these exchanges might be? they are also showing prices for other currencies. Any ideas on how those prices are being derived.

They are currently showing prices for bitcoin etc. Anyone knows what is the source of this price feed?

What is the exact distribution for EOS? Is block.one reserving some of the token supply for development purposes?

Is there a way to see all the accounts holding a particular asset? It is easy on Ethereum but I am hitting a roadblock on trying NXT or OMNI platform.

for NXT, I am using the mynxt blockchain explorer. So, if look at Ardor, this is the page for tokens:
https://www.mynxt.info/asset/12422608354438203866

On clicking the "number of accounts" link gets me nothing.

Similarly for OMNI, the https://omniexplorer.info/ has a property statistics link under "Smart Property". It redirects me to this link:

https://omniexplorer.info/spstats.aspx?sp=1

and the page is just a runtime error.

^^ Thanks for the explanation.

Someone please help me with the sizes of different transaction. Assuming 2 inputs and 2 outputs:
Basic - 438 bytes (https://bitcointalk.org/index.php?topic=1782523.0)
P2SH or Pay-to-Script-Hash - Same as P2PKH?
Multisig -  ?? (
RETURN - ??
Non-standard -  ??


And additionally, how much space if any does Segwit transaction save over the current ~ 438 bytes?

Thanks. I found a link which says there are 6 types:
https://www.cryptocompare.com/coins/guides/what-are-the-bitcoin-transaction-types/

What is the difference between Pay to public key vs pay to address?

What is estimated size of each type? Here's what I found:

Basic (P2PKH) - assuming 1-2 inputs and two outputs - 438 bytes ( https://bitcointalk.org/index.php?topic=1782523.0 )
P2SH or Pay-to-Script-Hash - Same as P2PKH?
Multisig -  ??
RETURN - ??
Non-standard -  ??
Segwit - ??

I found this interesting take on bitcoin transaction type trends from 2015: https://tradeblock.com/blog/analysis-of-bitcoin-transaction-size-trends

As this is from 2 years ago, I am wondering:

a. Are there any newer transaction types?

b. What is the average size of each of transaction type?

c. Is there a site/way to see the number of each transaction type included in each block?