Can somebody help me with some information?

My understanding is that Stellar did two distributions/airdrops to Bitcoin holders: one in 2016 and the other in 2017.

https://www.stellar.org/blog/bitcoin-claim-lumens/
https://www.stellar.org/blog/bitcoin-claim-lumens-2/

Does anybody know the Bitcoin block heights that each of these snapshots were taken at? I've been having trouble finding this information. Any help would be much appreciated!