Or is there a snapshot of the blockchain I can download?
you can resync with bootstrap.dat
https://mega.nz/#!c0o0FZLL!7pl0bNy5KpmXtIK572v7MXcKs-U_6NWoyFZkUnCid_M
seems it's the longest chain
getblockhash 1654000
bdf646b01b15a0f3d9717fe1f1a2c62daea422b8ed7837a33c36861ab7d6ab18