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1  Bitcoin / Development & Technical Discussion / UTXO set doesn't store the amounts? on: March 04, 2021, 04:17:31 PM
I read here how the UTXO set is structured in the leveldb

In the key-value pairs of the database, I don't see the amount for each UTXO represented.
When a client or a miner wants to check for the bitcoin amount for some UTXO, where is this fetched from? And how is it done securely? (i.e. without anyone being able to manipulate this amount?)
2  Bitcoin / Legal / Is buying from a merchant who accepts bitcoin a taxable event? on: February 13, 2021, 03:54:16 AM
Suppose I buy from a merchant who accepts bitcoin (e.g. Newegg which uses Bitpay).
Is this a taxable event? i.e. should I report my purchase to IRS?

3  Bitcoin / Electrum / Consolidate multiple output points into one on: January 18, 2021, 01:27:20 AM
My electrum wallet holds a segwit address beginning with bc1..
Under the "coins" tab I see it has many output points for the same address. Now the fees are low I think I can take advantage of it and consolidate all points into a single one, so I won't have to make larger transactions in the future (with multiple inputs).
My questions are:

a) How can I consolidate multiple output points?

b) I have a non-segwit wallet which always maintains a single output point. How do I prevent this from happening in my segwit wallet in the future? (i.e. maintain a single output point as well?)
4  Bitcoin / Electrum / Load and broadcast signed transaction in Android electrum on: January 17, 2021, 07:01:20 PM
I have a signed transaction file .txn (signed on a PC) and want to load and broadcast it in Android electrum. I don't see such an option, is there any way? Maybe can broadcast it using another app or website?
5  Bitcoin / Project Development / SmartMiner: a new web tool for cryptocurrency miners to maximize their profits on: June 11, 2019, 11:28:53 PM
Imagine the shipment of your new shiny ASICs has just arrived. You open their boxes, plug them in and open your web browser to their interface. You are asked to choose your mining pools to mine with. Now you would could just use that pool you have been mining with all those years (and maybe just pick a couple of backup pools) and enter its address to all of your ASICs. Maybe you could just opt for the "safety" of a reputable PPS pool which offers steady payouts with no luck involved, although you pay a 4% fee for your peace of mind. Or maybe you want to try a new pool, with lower fee and higher potential overall income.

Our new tool does exactly that: help you answer the question which pool(s) to join maximize your profit with the lowest risk possible. Available at and based on academic work (link in the website), it models this question as an optimization problem.

Using this tool you can get the optimal distribution of your hashpower by choosing among the most well-known Proof of Work cryptocurrencies and their associated well-known mining pools (if our tool does not include some specific mining pool you want to consider, you can always manually add it). Our tool automatically fetches all the required parameters for those cryptocurrencies and mining pools - all you need to do is
  • choose your cryptocurrency (or cryptocurrencies)
  • choose your mining pools
  • enter your power in hashes/second
  • your risk-aversion value (smaller values indicate higher risk, higher values indicate lower risk)
Then our tool will output the optimal way to distribute your power. We even take cross-chain mining into account, for example you might want to mine Bitcoin with one pool and Bitcoin Cash with another one.

You might now think of what is the actual potential benefit for you as a miner if you use our tool. First of all we do not promise that you will double your rewards if you mine for a couple of weeks - you probably know already that cryptocurrency mining involves luck, which varies especially for smaller mining pools. However in our work we show the potential benefit for the miner in a longer term period (e.g. 4 months or more). Specifically, we made several instances of retroactive comparisons in Bitcoin between a “passive” miner who just picked some pool to consistently mine on, and an “active” miner who used our tool every few days to optimally distribute his power. In all those instances (each involving a wide range of different problem parameters), there was a substantial benefit for the miner in terms of reward value over income variance.

Note that our tool is an early version - most likely there is still room for improvements. We welcome your comments and suggestions!

Disclaimer: This article is based on academic work. We do not suggest or advertise for (or against) specific mining pools in any cryptocurrency.

6  Bitcoin / Pools / Who is behind the "unknown" mining pool? on: May 28, 2019, 02:10:04 AM
I was looking for the mining pool pie chart for the last 24 hrs from and
Both sites report about 5.5 - 7.1% of "unknown" pool. Anyone know (preferably with concrete data) who is behind this "unknown" pool? Is it maybe a large mining farm that mines solo?
7  Local / Ελληνικά (Greek) / Stanford Blockchain Conference on: January 31, 2019, 08:26:37 PM
Αυτές τις μέρες τρέχει ένα πολύ ενδιαφέρον συνέδριο, το Stanford Blockchain Conference το οποίο κατά τη γνώμη μου είναι από τα πιο σοβαρά στο χώρο
υπάρχει και live stream (10 ώρες διαφορά με Ελλάδα)
8  Economy / Digital goods / Selling a $55 Bitmain coupon on: November 25, 2018, 10:36:57 PM
selling a $55 Bitmain coupon.
Price $10. Expires in 5 days.
Payment with any cryptocurrency.
PM for details
9  Local / Αγορά / Πωλείται χρόνος ομιλίας WhatsUp Cosmote με bonus on: October 17, 2018, 04:52:36 PM
Πωλείται χρόνος ομιλίας Cosmote Whatsup λόγω σημαντικού αρνητικού υπολοίπου στο λογαριασμό.

Η μεταφορά θα γίνει μέσω της υπηρεσίας Cosmote Mobile Easy Transfer. Όροι χρήσης παρακάτω

Τα ποσό που θα μεταφερθεί πρέπει να είναι πολλαπλάσιο των 30€. Για κάθε 30€ δίνεται 6€ bonus δώρο.
Πληρωμή με BTC ή ETH στην τρέχουσα ισοτιμία bitfinex.

ΡΜ για λεπτομέρειες.
10  Local / Αγορά / Πωλείται Bitmain κουπόνι on: September 20, 2018, 05:41:18 PM
Κουπόνι Bitmain $55, ημ. λήξης 30 Νοεμβρίου. Πωλείται 20€.
Πληρωμή με οποιοδήποτε κρυπτονόμισμα. Όποιος ενδιαφέρεται ΡΜ
11  Bitcoin / Development & Technical Discussion / Data history for mined blocks on: September 07, 2018, 02:46:10 AM
I am looking for historic data for mining pools to perform a study.
e.g. for Antpool, how many blocks it mined in January 2018, and for each block what was the Bitcoin network hashrate and what was the pool's hashrate.
I would also like to export them in readable format e.g. JSON.
I only found this in
which the data is not exportable (you have to click the button on the bottom a million times) only has history for 4 days..
Any suggestions?

(P.S. To moderators: Please do not delete my post again for no reason. If I'm posting on the wrong section please let me know which forum section would be applicable and move it there.)
12  Local / Ελληνικά (Greek) / Cryptocurrency και blockchain technology συνέδριο στην Αθήνα on: August 22, 2018, 05:41:06 PM
Για όσους ενδιαφέρονται, είναι να γίνει συνέδριο το Νοέμβριο στην Αθήνα (Divani Caravel) σχετικά με cryptocurrencies και blockchain technologies:
Διοργανωτής είναι το Πανεπιστήμιο της Λευκωσίας.
13  Economy / Invites & Accounts / World of Warcraft vanilla private server account on: August 19, 2018, 05:49:24 PM
For sale is my vanilla WoW private server account. Included in the account: a lvl60 8/8 T3 mage, a lvl60 T2 paladin and 20k gold.
Price for the whole account 0.0063BTC, or the equivalent in any other cryptocurrency.
Send a message for more information.
14  Local / Αγορά / Motherboard Asrock H81 Pro BTC R2.0 on: July 23, 2018, 12:58:04 PM
Πωλείται η motherboard Asrock Socket 1150 H81 Pro BTC R2.0 GLan Audio. Αγορασμένη τον 5/2017 με απόδειξη αγοράς από Ελληνικό κατάστημα. Σε άριστη κατάσταση στο κουτί της. Όχι ανταλλαγές - παζάρια. Περιοχή Αθήνα Ν. Προάστια. Τιμή 50€. Αποστέλλω και οπουδήποτε στην Ελλάδα κατόπιν συννενόησης.
15  Bitcoin / Bitcoin Technical Support / Time locked transactions on: May 30, 2018, 05:01:50 PM
I'm looking for information on time-locked transactions for bitcoin. How is this transaction created exactly? Does this transaction remain off-chain between the sender and the receiver until the time has elapsed? Does this transaction remain on the mempool until that time?
16  Economy / Digital goods / Selling 5x $100 Bitmain coupons on: May 24, 2018, 06:37:14 PM
selling 5x  $100 Bitmain coupons.
Price $20 each. $80 for all.
Special price $10 for 1x coupon expiring tomorrow.
Payment with any cryptocurrency.
PM for details
17  Local / Αγορά / Πωλούνται κουπόνια Bitmain on: April 17, 2018, 12:21:44 AM
Πωλούνται τα κάτωθι κουπόνια Bitmain:
2x $100, 25€ το καθένα
1x $350, 90€.
Όλα μαζί 120€.
Πληρωμή μέσω Πειραιώς λεφτά στο λεπτό ή με BTC, BCH, ETH, LTC.
PM για λεπτομέρειες.
18  Economy / Digital goods / WTS $100 Bitmain coupon on: March 22, 2018, 03:55:42 PM
Selling a $100 Bitmain coupon for half of its face value.
Accepting BTC, BCH, ETH or LTC.
PM for details
19  Local / Αγορά / Κουπόνι Bitmain $100 on: March 22, 2018, 03:54:31 PM
Πωλείται κουπόνι Bitmain $100 στη μισή τιμή της αξίας του.
Πληρωμή μέσω Πειραιώς λεφτά στο λεπτό ή με BTC, BCH, ETH, LTC.
PM για λεπτομέρειες.
20  Local / Αγορά / Πωλείται Antminer L3+ με PSU on: March 10, 2018, 03:58:37 PM
Πωλείται λόγω μετακόμισης το Antminer L3 504mh/s στο χέρι καινούριο. Μαζί και το τροφοδοτικό Bitmain APW3++.
Με εγγύηση από την Bitmain έως το Σεπτέμβριο.
Δέχομαι και cryptocurrencies.
Όχι ανταλλαγές.
Περιοχή Αθήνα Ν. Προάστια.
Στέλνω σε όλη την Ελλάδα κατόπιν συννενόησης.
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