By Alun John, Tom Westbrook and Tom Wilson HONG KONG/SINGAPORE/LONDON (Reuters) -A cryptocurrency platform has lost an estimated $600 million in digital tokens after one of the sector’s biggest ever hacking attacks, according to details of the heist which emerged on Wednesday. Poly Network, a decentralised finance platform (DeFi), announced the hack on Twitter https://twitter.com/PolyNetwork2/status/1425073987164381196 and posted details of digital wallets to which it said the money was transferred, urging people to blacklist tokens from those addresses. The value of the tokens in the wallets …

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