That should work. For 80bit search, 2^41 is an average time, with a probability of ~50% to find the key.
I will try this night.
Many thanks to MrFreeDragon for testing the software
It was the Bitcointalk forum that inspired us to create Bitcointalksearch.org - Bitcointalk is an excellent site that should be the default page for anybody dealing in cryptocurrency, since it is a virtual gold-mine of data. However, our experience and user feedback led us create our site; Bitcointalk's search is slow, and difficult to get the results you need, because you need to log in first to find anything useful - furthermore, there are rate limiters for their search functionality.
The aim of our project is to create a faster website that yields more results and faster without having to create an account and eliminate the need to log in - your personal data, therefore, will never be in jeopardy since we are not asking for any of your data and you don't need to provide them to use our site with all of its capabilities.
We created this website with the sole purpose of users being able to search quickly and efficiently in the field of cryptocurrency so they will have access to the latest and most accurate information and thereby assisting the crypto-community at large.
$ ./kangaroo -gpu -t 0 in80.txt
Kangaroo v1.1
Start:80000000000000000000
Stop :FFFFFFFFFFFFFFFFFFFF
Keys :1
Number of CPU thread: 0
Range width: 2^79
Number of random walk: 2^20.81 (Max DP=16)
DP size: 16 [0xffff000000000000]
GPU: GPU #0 GeForce GTX 1080 Ti (28x128 cores) Grid(56x256) (177.0 MB used)
SolveKeyGPU Thread GPU#0: creating kangaroos...
SolveKeyGPU Thread GPU#0: 2^20.81 kangaroos
[436.09 MKey/s][GPU 436.09 MKey/s][Count 2^39.55][Dead 0][35:22][942.4MB]
Key# 0 Pub: 0x037E1238F7B1CE757DF94FAA9A2EB261BF0AEB9F84DBF81212104E78931C2A19DC
Priv: 0xEA1A5C66DCC11B5AD180
Done: Total time 35:45
80000000000000000000
ffffffffffffffffffff
037e1238f7b1ce757df94faa9a2eb261bf0aeb9f84dbf81212104e78931c2a19dc
Kangaroo v1.2
Start:49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB4800000000000000000000
Stop :49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48FFFFFFFFFFFFFFFFFFFF
Keys :16
Number of CPU thread: 0
Range width: 2^80
Number of random walk: 2^22.09 (Max DP=15)
DP size: 15 [0xFFFE000000000000]
GPU: GPU #0 GeForce RTX 2080 Ti (68x64 cores) Grid(136x256) (417.0 MB used)
SolveKeyGPU Thread GPU#0: creating kangaroos...
SolveKeyGPU Thread GPU#0: 2^22.09 kangaroos in 16571.8ms
[1017.74 MKey/s][GPU 1017.74 MKey/s][Count 2^41.74][Dead 2][01:08:13][8578.7MB]
Kangaroo v1.2
Start:25FEEE926526B0B4F0085358DF14702F7F6F04E8EC2200000000000000000000
Stop :25FEEE926526B0B4F0085358DF14702F7F6F04E8EC22FFFFFFFFFFFFFFFFFFFF
Keys :1
Number of CPU thread: 0
Range width: 2^80
Number of random walk: 2^18.58 (Max DP=19)
DP size: 19 [0xFFFFE00000000000]
GPU: GPU #0 GeForce GTX 1050 Ti (6x128 cores) Grid(12x256) (45.0 MB used)
SolveKeyGPU Thread GPU#0: creating kangaroos...
SolveKeyGPU Thread GPU#0: 2^18.58 kangaroos in 1320.9ms
[115.22 MKey/s][GPU 115.22 MKey/s][Count 2^40.35][Dead 1][03:52:22][209.5MB]
Key# 0 Pub: 0x02E9CE716922FFB1CC2306E55D4E5A4F4A9B9D050E4ABB3EB95B246E7998A2508D
Priv: 0x25FEEE926526B0B4F0085358DF14702F7F6F04E8EC2243F5E7A6482FFC1F8DC4
Done: Total time 03:52:25
25FEEE926526B0B4F0085358DF14702F7F6F04E8EC2200000000000000000000
25FEEE926526B0B4F0085358DF14702F7F6F04E8EC22FFFFFFFFFFFFFFFFFFFF
02E9CE716922FFB1CC2306E55D4E5A4F4A9B9D050E4ABB3EB95B246E7998A2508D
$ ./kangaroo -t 0 -gpu in16.txt
Kangaroo v1.1
Start:49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E0000000000000000
Stop :49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EFFFFFFFFFFFFFFFF
Keys :16
Number of CPU thread: 0
Range width: 2^64
Number of random walk: 2^20.81 (Max DP=9)
DP size: 9 [0xff80000000000000]
GPU: GPU #0 GeForce GTX 1080 Ti (28x128 cores) Grid(56x256) (177.0 MB used)
SolveKeyGPU Thread GPU#0: creating kangaroos...
SolveKeyGPU Thread GPU#0: 2^20.81 kangaroos
Key# 0 Pub: 0x0259A3BFDAD718C9D3FAC7C187F1139F0815AC5D923910D516E186AFDA28B221DC
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EBB3EF3883C1866D4
[450.01 MKey/s][GPU 450.01 MKey/s][Count 2^32.58][Dead 0][38s][963.6MB]
Key# 1 Pub: 0x02A50FBBB20757CC0E9C41C49DD9DF261646EE7936272F3F68C740C9DA50D42BCD
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EB5ABC43BEBAD3207
[226.64 MKey/s][GPU 226.64 MKey/s][Count 2^31.62][Dead 0][30s][496.3MB]
Key# 2 Pub: 0x0304A49211C0FE07C9F7C94695996F8826E09545375A3CF9677F2D780A3EB70DE3
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E5698AAAB6CAC52B3
[390.01 MKey/s][GPU 390.01 MKey/s][Count 2^33.49][Dead 1][56s][1807.4MB]
Key# 3 Pub: 0x030B39E3F26AF294502A5BE708BB87AEDD9F895868011E60C1D2ABFCA202CD7A4D
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E59C839258C2AD7A0
[338.95 MKey/s][GPU 338.95 MKey/s][Count 2^33.91][Dead 3][01:08][2413.7MB]
Key# 4 Pub: 0x02837A31977A73A630C436E680915934A58B8C76EB9B57A42C3C717689BE8C0493
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E765FB411E63B92B9
[287.84 MKey/s][GPU 287.84 MKey/s][Count 2^31.95][Dead 0][32s][623.5MB]
Key# 5 Pub: 0x020ECDB6359D41D2FD37628C718DDA9BE30E65801A88A00C3C5BDF36E7EE6ADBBA
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E7D0E6081C7E0E865
[351.49 MKey/s][GPU 351.49 MKey/s][Count 2^33.80][Dead 1][01:06][2232.6MB]
Key# 6 Pub: 0x0322DD52FCFA3A4384F0AFF199D019E481D335923D8C00BADAD42FFFC80AF8FCF0
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EC737344CA673CE28
[415.57 MKey/s][GPU 415.57 MKey/s][Count 2^33.33][Dead 0][50s][1609.4MB]
Key# 7 Pub: 0x02DB4F1B249406B8BD662F78CBA46F5E90E20FE27FC69D0FBAA2F06E6E50E53669
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E38160DA9EBEAECD7
[303.41 MKey/s][GPU 303.41 MKey/s][Count 2^34.29][Dead 5][01:26][3133.8MB]
Key# 8 Pub: 0x023BD0330D7381917F8860F1949ACBCCFDC7863422EEE2B6DB7EDD551850196687
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E79D808CAB1DECF8D
[347.56 MKey/s][GPU 347.56 MKey/s][Count 2^32.22][Dead 1][34s][748.5MB]
Key# 9 Pub: 0x02332A02CA42C481EAADB7ADB97DF89033B23EA291FDA809BEA3CE5C3B73B20C49
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E54CAD3CFBC2A9C2B
[215.09 MKey/s][GPU 215.09 MKey/s][Count 2^31.55][Dead 0][32s][471.4MB]
Key#10 Pub: 0x02513981849DE1A1327DEF34B51F5011C5070603CA22E6D868263CB7C908525F0C
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E0D5ECCC38D0230E6
[284.99 MKey/s][GPU 284.99 MKey/s][Count 2^34.52][Dead 6][01:42][3670.8MB]
Key#11 Pub: 0x03D4E6FA664BD75A508C0FF0ED6F2C52DA2ADD7C3F954D9C346D24318DBD2ECFC6
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EE3579364DE939B0C
[404.11 MKey/s][GPU 404.11 MKey/s][Count 2^32.43][Dead 0][36s][866.9MB]
Key#12 Pub: 0x0356B468963752924DBF56112633DC57F07C512E3671A16CD7375C58469164599D
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E7C43B8E079AE7278
[229.29 MKey/s][GPU 229.29 MKey/s][Count 2^31.63][Dead 0][30s][502.1MB]
Key#13 Pub: 0x03D5BE7C653773CEE06A238020E953CFCD0F22BE2D045C6E5B4388A3F11B4586CB
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E8D63EF128EF66B42
[402.53 MKey/s][GPU 402.53 MKey/s][Count 2^33.42][Dead 1][54s][1714.8MB]
Key#14 Pub: 0x02B1985389D8AB680DEDD67BBA7CA781D1A9E6E5974AAD2E70518125BAD5783EB5
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E2452DD26BC983CD5
[328.84 MKey/s][GPU 328.84 MKey/s][Count 2^34.01][Dead 9][01:12][2575.7MB]
Key#15 Pub: 0x0355B95BEF84A6045A505D015EF15E136E0A31CC2AA00FA4BCA62E5DF215EE981B
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E7AD38337C7F173C7
Done: Total time 16:11
C:\C++\Kangaroo\VC_CUDA10\x64\Release>Kangaroo.exe -t 0 -gpu ..\..\in.txt
Kangaroo v1.0
Start:49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E0000000000000000
Stop :49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EFFFFFFFFFFFFFFFF
Keys :16
Number of CPU thread: 0
Range width: 2^64
Number of random walk: 2^18.58 (Max DP=11)
DP size: 11 [0xFFE0000000000000]
GPU: GPU #0 GeForce GTX 1050 Ti (6x128 cores) Grid(12x256) (45.0 MB used)
SolveKeyGPU Thread GPU#0: creating kangaroos...
SolveKeyGPU Thread GPU#0: 2^18.58 kangaroos
[115.23 MKey/s][GPU 115.23 MKey/s][Count 2^33.52][Dead 5][02:02][463.9MB]
Key# 0 Pub: 0x0259A3BFDAD718C9D3FAC7C187F1139F0815AC5D923910D516E186AFDA28B221DC
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EBB3EF3883C1866D4
[115.22 MKey/s][GPU 115.22 MKey/s][Count 2^32.41][Dead 1][01:01][218.3MB]
Key# 1 Pub: 0x02A50FBBB20757CC0E9C41C49DD9DF261646EE7936272F3F68C740C9DA50D42BCD
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EB5ABC43BEBAD3207
[115.13 MKey/s][GPU 115.13 MKey/s][Count 2^32.99][Dead 0][01:29][323.5MB]
Key# 2 Pub: 0x0304A49211C0FE07C9F7C94695996F8826E09545375A3CF9677F2D780A3EB70DE3
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E5698AAAB6CAC52B3
[115.21 MKey/s][GPU 115.21 MKey/s][Count 2^32.66][Dead 0][01:12][258.7MB]
Key# 3 Pub: 0x030B39E3F26AF294502A5BE708BB87AEDD9F895868011E60C1D2ABFCA202CD7A4D
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E59C839258C2AD7A0
[115.22 MKey/s][GPU 115.22 MKey/s][Count 2^33.26][Dead 1][01:47][389.7MB]
Key# 4 Pub: 0x02837A31977A73A630C436E680915934A58B8C76EB9B57A42C3C717689BE8C0493
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E765FB411E63B92B9
[114.51 MKey/s][GPU 114.51 MKey/s][Count 2^34.70][Dead 8][04:42][1044.9MB]
Key# 5 Pub: 0x020ECDB6359D41D2FD37628C718DDA9BE30E65801A88A00C3C5BDF36E7EE6ADBBA
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E7D0E6081C7E0E865
[115.21 MKey/s][GPU 115.21 MKey/s][Count 2^32.00][Dead 1][47s][164.7MB]
Key# 6 Pub: 0x0322DD52FCFA3A4384F0AFF199D019E481D335923D8C00BADAD42FFFC80AF8FCF0
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EC737344CA673CE28
[115.21 MKey/s][GPU 115.21 MKey/s][Count 2^32.12][Dead 0][51s][179.6MB]
Key# 7 Pub: 0x02DB4F1B249406B8BD662F78CBA46F5E90E20FE27FC69D0FBAA2F06E6E50E53669
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E38160DA9EBEAECD7
[115.06 MKey/s][GPU 115.06 MKey/s][Count 2^33.88][Dead 5][02:42][595.5MB]
Key# 8 Pub: 0x023BD0330D7381917F8860F1949ACBCCFDC7863422EEE2B6DB7EDD551850196687
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E79D808CAB1DECF8D
[115.23 MKey/s][GPU 115.23 MKey/s][Count 2^31.71][Dead 0][39s][136.2MB]
Key# 9 Pub: 0x02332A02CA42C481EAADB7ADB97DF89033B23EA291FDA809BEA3CE5C3B73B20C49
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E54CAD3CFBC2A9C2B
[83.23 MKey/s][GPU 83.23 MKey/s][Count 2^30.23][Dead 0][17s][51.3MB]
Key#10 Pub: 0x02513981849DE1A1327DEF34B51F5011C5070603CA22E6D868263CB7C908525F0C
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E0D5ECCC38D0230E6
[114.85 MKey/s][GPU 114.85 MKey/s][Count 2^34.98][Dead 20][05:41][1269.3MB]
Key#11 Pub: 0x03D4E6FA664BD75A508C0FF0ED6F2C52DA2ADD7C3F954D9C346D24318DBD2ECFC6
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5EE3579364DE939B0C
[115.22 MKey/s][GPU 115.22 MKey/s][Count 2^33.99][Dead 2][02:54][642.5MB]
Key#12 Pub: 0x0356B468963752924DBF56112633DC57F07C512E3671A16CD7375C58469164599D
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E7C43B8E079AE7278
[115.11 MKey/s][GPU 115.11 MKey/s][Count 2^33.12][Dead 0][01:37][351.9MB]
Key#13 Pub: 0x03D5BE7C653773CEE06A238020E953CFCD0F22BE2D045C6E5B4388A3F11B4586CB
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E8D63EF128EF66B42
[115.22 MKey/s][GPU 115.22 MKey/s][Count 2^31.36][Dead 0][32s][108.8MB]
Key#14 Pub: 0x02B1985389D8AB680DEDD67BBA7CA781D1A9E6E5974AAD2E70518125BAD5783EB5
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E2452DD26BC983CD5
[115.22 MKey/s][GPU 115.22 MKey/s][Count 2^31.49][Dead 0][34s][118.0MB]
Key#15 Pub: 0x0355B95BEF84A6045A505D015EF15E136E0A31CC2AA00FA4BCA62E5DF215EE981B
Priv: 0x49DCCFD96DC5DF56487436F5A1B18C4F5D34F65DDB48CB5E7AD38337C7F173C7
Done: Total time 29:44