I have a blockchain that was last added to nearly 11 years ago:

08-Nov-2014 10:12:15 UTC+0 height: 107083  mint: 0.008049  difficulty: 0.00390625  flags: proof-of-stake  tx: 2  hash: 807414cc0d4fcb124a0d72ffc03ef5c4e046c92fe4ca835392465e32e3c2b8c8
08-Nov-2014 18:37:18 UTC+0 height: 107084  mint: 0.008952  difficulty: 0.00390625  flags: proof-of-stake  tx: 2  hash: aa2003739012e87219637e2c6a7b46594a6ac1daacd35ce731dff9b4b690f68e
08-Nov-2014 19:50:56 UTC+0 height: 107085  mint: 0.009117  difficulty: 0.00390625  flags: proof-of-stake|stake-modifier  tx: 2  hash: 35b815c5a81199d7abe07de1841166f1624f32cfd5bfc4026f879f5d46d6327f
09-Nov-2014 01:14:45 UTC+0 height: 107086  mint: 0.00887  difficulty: 0.00390625  flags: proof-of-stake  tx: 2  hash: 139caa238fbdea7538e552958f4eb0270bbc211747cc1a17888a84503899bef1
09-Nov-2014 04:05:32 UTC+0 height: 107087  mint: 0.009035  difficulty: 0.00390625  flags: proof-of-stake|stake-modifier  tx: 2  hash: 231941d7d67a83d470e7c6411cbc61af9ed2dab90a55a1fb678bf86912736ad5
09-Nov-2014 14:38:52 UTC+0 height: 107088  mint: 0.008788  difficulty: 0.00390625  flags: proof-of-stake  tx: 2  hash: 382cab65ad7563d8b6d2658776ee2d8986516f8e348237b72947ea4fcc711c50
09-Nov-2014 18:40:15 UTC+0 height: 107089  mint: 0.008952  difficulty: 0.00390625  flags: proof-of-stake|stake-modifier  tx: 2  hash: 784a1e58ecc8f23f632da4ec1a58e045ba4fef8a61981a83817985ea72d1beca
09-Nov-2014 18:55:48 UTC+0 height: 107090  mint: 0.008788  difficulty: 0.00390625  flags: proof-of-stake  tx: 2  hash: 68b45df658c73749dab5176148c87b3546298f7da9e8c10b2ed36e968ceeebd7
09-Nov-2014 20:29:19 UTC+0 height: 107091  mint: 0.009035  difficulty: 0.00390625  flags: proof-of-stake  tx: 2  hash: e6e552dd94c217593df10ed4c15fb2a13e9e4d87c6bd92091229452dd68bf166

My newest transaction has 5225 confirmations, so at least 5225 blocks at the tip were generated by others.

Did the blockchain ever get extended beyond this point?