According to this puzzle 66 is reduce 66 times
BitCrack.exe -b 128 -t 256 -p 512 -i 256.txt --keyspace f7051f0000000000:f7051fffffffffff --stride 64
[2023-09-08.05:38:07] [Info] Compression : compressed
[2023-09-08.05:38:07] [Info] Seach mode : ADDRESS
[2023-09-08.05:38:07] [Info] Starting at : F7051F0000000000 (64 bit)
[2023-09-08.05:38:07] [Info] Ending at : F7051FFFFFFFFFFF (64 bit)
[2023-09-08.05:38:07] [Info] Range : FFFFFFFFFF (40 bit)
[2023-09-08.05:38:07] [Info] Stride : 64
[2023-09-08.05:38:07] [Info] Initializing NVIDIA GeForce RTX 3060 Ti
[2023-09-08.05:38:07] [Info] Generating 16,777,216 starting points (640.0MB)
[2023-09-08.05:38:08] [Info] 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0%
[2023-09-08.05:38:09] [Info] Done
[2023-09-08.05:38:10] [Info] Loading addresses from '256.txt'
[2023-09-08.05:38:10] [Info] 1,340 addresses loaded (0.0MB)
[2023-09-08.05:38:10] [Info] Allocating bloom filter (0.0MB)
[DEV: NVIDIA GeForce R 3613/8191MB] [K: F7051F251C000000 (64 bit), C: 14.495850 %] [I: 64 (7 bit), 1] [T: 1340] [S: 879.60 MK/s] [1,593,835,520 (31 bit)] [00:00:00] [2023-09-08.05:38:11] [Info] Allocating bloom filter (0.0MB)
[2023-09-08.05:38:12] [Info] Found key for address '16jY7qLJnxb7CHZyqBP8qca9d51gAjyXQN'. Written to 'Found.txt'
[2023-09-08.05:38:12] [Info] Address : 16jY7qLJnxb7CHZyqBP8qca9d51gAjyXQN
Private key : F7051F27B09112D4
Compressed : yes
Public key : 03100611C54DFEF604163B8358F7B7FAC13CE478E02CB224AE16D45526B25D9D4D
[DEV: NVIDIA GeForce R 3613/8191MB] [K: F7051FDDE0000000 (64 bit), C: 86.669922 %] [I: 64 (7 bit), 1] [T: 1339] [S: 869.86 MK/s] [9,529,458,688 (34 bit)] [00:00:09]
[2023-09-08.05:38:22] [Info] Reached end of keyspace
BitCrack.exe -b 128 -t 256 -p 512 -i 256.txt --keyspace 1a838b00000000000:1a838bfffffffffff --stride 65
[2023-09-08.05:39:30] [Info] Compression : compressed
[2023-09-08.05:39:30] [Info] Seach mode : ADDRESS
[2023-09-08.05:39:30] [Info] Starting at : 1A838B00000000000 (65 bit)
[2023-09-08.05:39:30] [Info] Ending at : 1A838BFFFFFFFFFFF (65 bit)
[2023-09-08.05:39:30] [Info] Range : FFFFFFFFFFF (44 bit)
[2023-09-08.05:39:30] [Info] Stride : 65
[2023-09-08.05:39:30] [Info] Initializing NVIDIA GeForce RTX 3060 Ti
[2023-09-08.05:39:30] [Info] Generating 16,777,216 starting points (640.0MB)
[2023-09-08.05:39:32] [Info] 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0%
[2023-09-08.05:39:33] [Info] Done
[2023-09-08.05:39:33] [Info] Loading addresses from '256.txt'
[2023-09-08.05:39:33] [Info] 1,340 addresses loaded (0.0MB)
[2023-09-08.05:39:33] [Info] Allocating bloom filter (0.0MB)
[DEV: NVIDIA GeForce R 3613/8191MB] [K: 1A838B1297A000000 (65 bit), C: 7.262611 %] [I: 65 (7 bit), 1] [T: 1340] [S: 869.86 MK/s] [12,650,020,864 (34 bit)] [00:00:12] [2023-09-08.05:39:48] [Info] Allocating bloom filter (0.0MB)
[2023-09-08.05:39:48] [Info] Found key for address '18ZMbwUFLMHoZBbfpCjUJQTCMCbktshgpe'. Written to 'Found.txt'
[2023-09-08.05:39:48] [Info] Address : 18ZMbwUFLMHoZBbfpCjUJQTCMCbktshgpe
Private key : 1A838B13505B26867
Compressed : yes
Public key : 0230210C23B1A047BC9BDBB13448E67DEDDC108946DE6DE639BCC75D47C0216B1B
[DEV: NVIDIA GeForce R 3613/8191MB] [K: 1A838B2BE44000000 (65 bit), C: 17.145157 %] [I: 65 (7 bit), 1] [T: 1339] [S: 860.61 MK/s] [29,863,444,480 (35 bit)] [00:00:32]
============================= Puzzle 66 Total keys = (36,893,488,147,419,103,232) ===================================
Lastt Found Address : 23d550f16301af7b0719903616e37378be5d43ab
Puzzl Sarch Address : 20d45a6a762535700ce9e0b216e31994335db8a5
Prfix Match Address : ^ ^ ^ ^ ^ ^ ^ ^^^^ ^^ ^
Charr Match Totalss : 14
Bes58 Match Colorzz : 14GUCBaK3j9JGMGWZVd7curb5Y5uv2EXnJ 31fe6d97c22167688
Bes58 Match Colorzz : 13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so 312d86d64f36e736f
[2023-09-08.07:17:02] [Info] Compression : compressed
[2023-09-08.07:17:02] [Info] Seach mode : ADDRESS
[2023-09-08.07:17:02] [Info] Starting at : 31FE6D00000000000 (66 bit)
[2023-09-08.07:17:02] [Info] Ending at : 31FE6DFFFFFFFFFFF (66 bit)
[2023-09-08.07:17:02] [Info] Range : FFFFFFFFFFF (44 bit)
[2023-09-08.07:17:02] [Info] Stride : 66
[2023-09-08.07:17:02] [Info] Initializing NVIDIA GeForce RTX 3060 Ti
[2023-09-08.07:17:02] [Info] Generating 16,777,216 starting points (640.0MB)
[2023-09-08.07:17:04] [Info] 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0%
[2023-09-08.07:17:05] [Info] Done
[2023-09-08.07:17:05] [Info] Loading addresses from '256.txt'
[2023-09-08.07:17:05] [Info] 1,340 addresses loaded (0.0MB)
[2023-09-08.07:17:05] [Info] Allocating bloom filter (0.0MB)
[DEV: NVIDIA GeForce R 3613/8191MB] [K: 31FE6DFED9C000000 (66 bit), C: 99.551010 %] [I: 66 (7 bit), 1] [T: 1340] [S: 853.55 MK/s] [171,698,028,544 (38 bit)] [00:03:17]
[2023-09-08.07:20:25] [Info] Reached end of keyspace
============================= Puzzle 66 Total keys = (36,893,488,147,419,103,232) ===================================
Lastt Found Address : f0380a677a3ffac008bc403255e3e9e833770b15
Puzzl Sarch Address : 20d45a6a762535700ce9e0b216e31994335db8a5
Prfix Match Address : ^ ^^ ^ ^^ ^ ^ ^^ ^ ^^ ^
Charr Match Totalss : 14
Bes58 Match Colorzz : 1NuAJp4KKSeiGEcbfTsXk9YTFu9RTu7ytr 2e26fb283392ed368
Bes58 Match Colorzz : 13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so 312d86d64f36e736f
[2023-09-08.08:08:57] [Info] Compression : compressed
[2023-09-08.08:08:57] [Info] Seach mode : ADDRESS
[2023-09-08.08:08:57] [Info] Starting at : 2E26FB00000000000 (66 bit)
[2023-09-08.08:08:57] [Info] Ending at : 2E26FBFFFFFFFFFFF (66 bit)
[2023-09-08.08:08:57] [Info] Range : FFFFFFFFFFF (44 bit)
[2023-09-08.08:08:57] [Info] Stride : 66
[2023-09-08.08:08:57] [Info] Initializing NVIDIA GeForce RTX 3060 Ti
[2023-09-08.08:08:57] [Info] Generating 16,777,216 starting points (640.0MB)
[2023-09-08.08:08:59] [Info] 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0%
[2023-09-08.08:09:00] [Info] Done
[2023-09-08.08:09:00] [Info] Loading addresses from '256.txt'
[2023-09-08.08:09:00] [Info] 1,340 addresses loaded (0.0MB)
[2023-09-08.08:09:00] [Info] Allocating bloom filter (0.0MB)
[DEV: NVIDIA GeForce R 3613/8191MB] [K: 2E26FBFE6D6000000 (66 bit), C: 99.385643 %] [I: 66 (7 bit), 1] [T: 1340] [S: 851.82 MK/s] [171,412,815,872 (38 bit)] [00:03:18]
[2023-09-08.08:12:21] [Info] Reached end of keyspace
============================= Puzzle 66 Total keys = (36,893,488,147,419,103,232) ===================================
Lastt Found Address : 97d9536e5d2505d00ccae94c1fe3f99e6a7fdf8e
Puzzl Sarch Address : 20d45a6a762535700ce9e0b216e31994335db8a5
Prfix Match Address : ^ ^ ^ ^^ ^ ^^^ ^ ^ ^^ ^^
Charr Match Totalss : 15
Bes58 Match Colorzz : 1EquP32CeUQYtxT9MKDgMCtcAFWHMDnKEg 3804efb4d8c8f7721
Bes58 Match Colorzz : 13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so 312d86d64f36e736f
[2023-09-08.08:30:44] [Info] Compression : compressed
[2023-09-08.08:30:44] [Info] Seach mode : ADDRESS
[2023-09-08.08:30:44] [Info] Starting at : 3804EF00000000000 (66 bit)
[2023-09-08.08:30:44] [Info] Ending at : 3804EFFFFFFFFFFFF (66 bit)
[2023-09-08.08:30:44] [Info] Range : FFFFFFFFFFF (44 bit)
[2023-09-08.08:30:44] [Info] Stride : 66
[2023-09-08.08:30:44] [Info] Initializing NVIDIA GeForce RTX 3060 Ti
[2023-09-08.08:30:44] [Info] Generating 16,777,216 starting points (640.0MB)
[2023-09-08.08:30:45] [Info] 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0%
[2023-09-08.08:30:47] [Info] Done
[2023-09-08.08:30:47] [Info] Loading addresses from '256.txt'
[2023-09-08.08:30:47] [Info] 1,340 addresses loaded (0.0MB)
[2023-09-08.08:30:47] [Info] Allocating bloom filter (0.0MB)
[DEV: NVIDIA GeForce R 3613/8191MB] [K: 3804EFFE274000000 (66 bit), C: 99.278641 %] [I: 66 (7 bit), 1] [T: 1340] [S: 851.82 MK/s] [171,228,266,496 (38 bit)] [00:03:17]
[2023-09-08.08:34:08] [Info] Reached end of keyspace
============================= Puzzle 66 Total keys = (36,893,488,147,419,103,232) ===================================
Lastt Found Address : 24e444da7d2b980206e9e052284298c2935d5722
Puzzl Sarch Address : 20d45a6a762535700ce9e0b216e31994335db8a5
Prfix Match Address : ^ ^ ^^ ^ ^ ^^^^ ^ ^^^
Charr Match Totalss : 14
Bes58 Match Colorzz : 14N4nK3uhTFsTEHi1nrWnf5JpBjjDrSffW 38c6f1f5ff02834b0
Bes58 Match Colorzz : 13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so 312d86d64f36e736f
[2023-09-08.09:12:16] [Info] Compression : compressed
[2023-09-08.09:12:16] [Info] Seach mode : ADDRESS
[2023-09-08.09:12:16] [Info] Starting at : 38C6F100000000000 (66 bit)
[2023-09-08.09:12:16] [Info] Ending at : 38C6F1FFFFFFFFFFF (66 bit)
[2023-09-08.09:12:16] [Info] Range : FFFFFFFFFFF (44 bit)
[2023-09-08.09:12:16] [Info] Stride : 66
[2023-09-08.09:12:16] [Info] Initializing NVIDIA GeForce RTX 3060 Ti
[2023-09-08.09:12:16] [Info] Generating 16,777,216 starting points (640.0MB)
[2023-09-08.09:12:18] [Info] 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0%
[2023-09-08.09:12:19] [Info] Done
[2023-09-08.09:12:19] [Info] Loading addresses from '256.txt'
[2023-09-08.09:12:19] [Info] 1,340 addresses loaded (0.0MB)
[2023-09-08.09:12:19] [Info] Allocating bloom filter (0.0MB)
[DEV: NVIDIA GeForce R 3613/8191MB] [K: 38C6F1FEA06000000 (66 bit), C: 99.463463 %] [I: 66 (7 bit), 1] [T: 1340] [S: 851.82 MK/s] [171,547,033,600 (38 bit)] [00:03:18]
[2023-09-08.09:15:40] [Info] Reached end of keyspace
Another long post