What is the ruling on money deposited in the Custodian Council (al-Majlis al-Hasabi) that was coercively invested in a usurious bank, and is Zakat retrospectively obligatory on it, given the prior lack of knowledge of the ruling, and how should the usurious profits from this money be disposed of?

If depositing minors' funds in the Hasbi Council is obligatory, then there is no sin upon the guardian or the minor, the owner of the money, after reaching maturity, because he is considered to be under duress. The guardian and the minor, after reaching maturity and becoming رشيد (of sound judgment), must transfer the account from this council to an entity that does not deal with usury, whenever possible. The usurious interest must be disposed of by spending it on Muslim welfare, as it is unlawful money. Zakat (definition) is obligatory on the principal amount of the money, not on the usurious interest, and it is not forfeited by prescription or ignorance of it. The owner may benefit from the usurious interest if he is in need or poor.