By Manya Saini and Niket Nishant (Reuters) -Several exchange-traded funds (ETFs) tied to the spot price of bitcoin began trading in the U.S. on Thursday in a landmark moment for the cryptocurrency industry that has been seeking regulatory approval for the financial product for over a decade. The green light by the U.S. Securities and Exchange Commission finally came late on Wednesday following months-long talks with top asset managers such as BlackRock, Ark Investments/21Shares, Fidelity, Invesco and VanEck. The regulator approved 11 such ETFs, paving the way for popularizing investments in th…

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