understanding bits and difficulty in a block header

This block:
https://blockchain.info/block/00000000000000000025c089d0a7b2bf6241888c4dd90ab7a4c4baa6a2823551

Shows difficulty at 3,007,383,866,429.73, and bits at 392009692.

If I want to see how many zeros need to be in the hash, I believe I can just do:

(log2(3007383866429.73) + 32) / 4) => 18.362911541451258

Which is correct.. But how does bits come from difficulty? How can I calculate the number of zeros from the bits instead of the difficulty?

Kucoin API buy and sell

Why, when I using Kucoin API, get_tick, for market info, I see, that sell is bigger buy?

Example from oficcial API Documentation:
With a symbol param

{
    "coinType": "KCS",
    "trading": true,
    "lastDealPrice": 5040,
    "buy": 5000,
    "sell": 5040,
    "coinTypePair": "BTC",
    "sort": 0,
    "feeRate": 0.001,
    "volValue": 308140577,
    "high": 6890,
    "datetime": 1506050394000,
    "vol": 5028739175025,
    "low": 5040,
    "changeRate": -0.2642
}

block decode failed (-22) error solo mining while submitting block

Hi I have developed hardware/software to mine bitcoin it’s working and getting me the results (getting nonce since the design takes only .2sec to complete the task)i am trying to submit in my local bitcoin wallet its error message is

Traceback (most recent call last):
  File "./submit_b.py", line 282, in <module>
    rpc_submitblock(rpc_con(),block_miner(rpc_getblocktemplate(rpc_con()),binascii.b2a_hex('Bitmatriz'.encode()).decode(), "19DvxDw7zfiBDcvZCyhboNjJ2VW6d2mD2P"))
  File "./submit_b.py", line 124, in rpc_submitblock
    message = rpc_con.submitblock(param)
  File "/home/bitmatriz/.local/lib/python3.6/site-packages/bitcoinrpc/authproxy.py", line 141, in __call__
    raise JSONRPCException(response['error'])
bitcoinrpc.authproxy.JSONRPCException: -22: Block decode failed

Below is the data generated from the script

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Bitcoin Core data to csv

I would like to download the Bitcoin blockchain and use the data for machine learning purposes. For this, I have to get the data into a workable format like csv or a flat JSON etc.

I’ve read about approaches and the most common one seems to be through a monkeyDB. Do you know a source code that implements this method? Or do you know other methods that could be used to get the Ethereum blockchain data into a modeling friendly format?

Thanks!

How to unblock an account that is held to ransom

I have a blockchain account with bitcoins in but the account is held at ransom. I have to pay 2140$ to get a private key. Is there any way to report this to Blockchain.

I did a trading agreement. The dealer put my profits into a mining account on Blockchain. To retreive my funds I need to purchase a key from the dealer to have the funds released. Hope I am making sense

Refunding of payments made

I was scammed November 2017 by a woman called, Adele Johnson. I wanted to trade on bitcoin, but didn’t had the experience to do it myself. She offered her help to trade on behalf of me. I paid R8000 into my Luno account where she requested all my registration details as well my wallet address. She made use of Tradeway Option Platform to trade for me. According to her my money growth to $50 000 and for me to withdraw this money I need to pay $7000. I told her I don’t have such money, she got angry and blocked me.
A man, called Artem Vladys told me he can help me to trace this money through interpol. He requested a payment of $300 and he assured me that will be the only payment I had to make; which I made via Luno, I bought him bitcoin worth $300 and sent it to the wallet adress: 154oDjBXc1wSzYncP6YwrU7a9duVGd3J3. He requested another amound of $200, I unfortunately refused to make another payment before I haven’t seen what he did to assist me tracing my lost money. He got mad and he blocked me.
Both people said they work for bitcoin.
All the transactions shows in my luno account. Is there any possibility that I can trace this money? Is there not honarable people/organisation who can get my money back?

what is a discrete logarithmic assumption? how does it set-up trustless proofs?

pending proposal of bulletproofs as a zk proof for confidential transactions relies on fiat-shamir heuristic to be non-interactive via creating a digital signature on interactive proof of knowledge and as cited in [bootle, wuille, maxwell et al] “Bulletproofs: Short Proofs for Confidential Transactions and More” paper also rely on discrete logarithmic assumption be a trustless proof (unlike snarks). this led to my question above as im not well-versed on this topic and would like to learn more about this, more specifically in its relation to setting up bulletproofs.

How do I calculate the expected shares per minute for my pool

I am currently mining Zencash in a pool, and I’d like to be able to calculate the expected shares per minute for a given pool’s hashrate. Let’s say the pool’s hashrate is 50 KSol/s. I think that the shares would need to be standardized to some share difficulty, let’s call it one. The current block difficulty is 764,414.6217 (11.0 block reward). I’ve been digging around and it’s hard to find the math involved in this. Does anyone know how to do this for Zencash?