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Both parties. Stellar published it on their site saying Poloniex agreed and then also Poloniex for not making any news as of late (nor responding to questions about it).

Will be interesting if Poloniex claim it and keep it for themselves. That would be the real low act...

This was announced several months ago and I bet Poloniex was well aware of it. Many users opened tickets at Poloniex asking if they will receive the airdrop for lend out coins. So Poloniex at least should have clearified this before the snapshot was taken...