Marja'

Taqleed is based on the logical necessity for the non expert to refer to the expert.

This is followed in every field of knowledge in life. All human beings practically follow this fact in every matter. Religious day to day rules are not an exception. Non experts in religious studies need to follow the experts. We believe that every religious act must be based on real evidence. Evidence is known to the experts who spend long time in studying and researching the Islamic sources ( Quran, Hadeeth, Aql and Ejmaa'). People must refer in religious matters to the most learned Islamic scholar who is called al-'Alam.

From the time of the Prophet (SAWA) and the Ifallible Imams, Muslims who lived in places far away from them, were ordered to refer in religious matters to the scholar in their area. 
Taqleed is obligatory on non experts in religious studies (non Mujahid or non Muhtaat). With out Taqleed, non expert will practice religious acts with out authentic evidence and this is not accepted in Islam.

Wassalam.

Allah is The Absolute Wise and He has the Full Knowledge about everything and everyone. All rules in Islam are based on the absolute Wisdom and Knowledge and Mercy of Allah which aims for the interest of man and human kind.

illegitimately born child has no fault to be punished for, and he should be saved from social criticism. This might be one of the reasons that such person should not be exposed in public as leader of prayers or leader of society ( Marja' of Taqleed).

Keeping him away from regions leadership might be also for avoiding legitimising the sinful act from which he was born and not encouraging people to commit it.

Finally, we say that Allah is The Most Just, Most Wise, Most Merciful and He Knows the full reasons, but we firmly believe that it is always for the interest of man and mankind.

Wassalam.

Every Muslim needs to have authentic evidence that he is acting upon the orders of Islam in every religious act and deed. Such evidence can not be available to non professional person unless he relies on the verdict of professional scholar (Mujtahid). That is why Taqleed is compulsory on every non professional Muslim otherwise his religious deeds will be with out supporting evidence, which means that it can be not correct.

When you follow the most learned scholar, you will not be responsible if he makes an error as your responsibility is just to act upon the verdict and evidence derived by the most learned scholar.

Wassalam.

No, it is not sufficient to ask one trustworthy person about which Marja to follow. He must be a high caliber 'Aalim (scholar), yet his witness alone is not sufficient because witness should come from two high caliber 'Aalims. 

Wassalam.

Majority of the Shia Muslims today follow in Taqleed, Ayatullah al-Udhma Sayyed Ali al-Husaini al- Sistani. This is because of the fact that majority of Shia scholars in the Hawza of Najaf Ashraf, Qum, Mashhad and other places, believe that Ayatullah Sistani is the most knowledgeable among Shia high caliber scholars (Mujtahids). No doubt, there are other Maraaji' in Iran and Iraq who have lot of followers in Taqleed, but Ayatullah Sistani is the most followed Marja' in this time. May Allah protect him and prolong his life, and all the Maraaji'.

Wassalam.

The answer of this question depends on the question on crypto currency itself whether it is real or not. Many of Muslim scholars are still not sure hence carrying on research on this matter. When the picture is clear for majority of the scholars, they will give their verdict on crypto currency.

You need to wait till this main question is answered, then the question of brokerage comes after that.

Wassalam.

You need to seek advice of high caliber Islamic scholars in the Hawza who should witness who is the most learned scholar among all the authentic Mujtahids. Two (at least) pious high caliber scholars in the Hawza should such witness.

Wassalam.

The linguistic meaning of it is (Peace be upon him) which is in fact used for every Muslim when you say to him : Salamun Alaykum.(Peace be upon you).

But as a term and common understanding , we have to be careful in using it to avoid mixing between the Infallible and others.

Wassalam.

If the verdicts of different Marja' s are different on certain matter, you must follow the most knowledgeable Marja'.

It is never a matter of personal convenience but the Islamic duty to follow the most learned.

Wassalam.