This question shall be answered by the analysis of some data from the application coin-doubler.

How does coin-doubler work

This application generates profits in the cryptoscene by using the most advanced technology and everybody can benefit from it by "donations". Donations to coin-doubler are rewarded with twice the amount in the same token over an unspecified period of time, also as a gift.

Evaluation of a randomly selected donation

The user golden-panther has donated 3,000.000 STEEM to coin-doubler with this transaction cd94f2dd1b179d1fd3f1201f551ad9dd8eed4cf5 on 03/26/2021 UTC.

List of the gifts

The table below lists the corresponding gifts which the user golden-panther has received from coin-doubler.

#	Date	Gift	TX
1	03/27/2021	119.052 STEEM	0138cb6691c3bb41d1ae11406fd036ce1cc673b7
2	03/28/2021	97.043 STEEM	2e898cb93e28975c6210c5aa6d5b413997f91eb7
3	03/29/2021	92.042 STEEM	ebda0551c149d78e8d52f62ad3e84bea394019a6
4	03/30/2021	113.580 STEEM	5a9da3e75813f76968282f4d476ec918bef580e5
5	03/31/2021	94.879 STEEM	fbc2b948b59c4702bb61b7ca7807e7354114e7a8
6	04/01/2021	96.522 STEEM	258314dd8868237d363fbc209b027528b440549b
7	04/02/2021	102.738 STEEM	fa4622d8aecbb44143958022d5f2d4dccbebb7f9
8	04/03/2021	116.468 STEEM	bc6c6d1d47bf7b63f9eb74aba715c3a61bff3585
9	04/04/2021	101.592 STEEM	c9f63da20c0881b892f0074e6c514e4345733a61
10	04/05/2021	94.677 STEEM	fa092c7f9db231473fbc00983ef8593a011c2c49
11	04/06/2021	92.029 STEEM	6fd310106014eeada75bb1f2bafe2592d9dde357
12	04/07/2021	113.911 STEEM	06bf16b68aed24a76bc135bf7d7df178814e35a4
13	04/08/2021	90.476 STEEM	56c71e2374aa77cdc9e83ae872cbd3ecdad8dcbe
14	04/09/2021	102.483 STEEM	d76207ff6d18e1130dcce4c5699dc984955904fe
15	04/10/2021	100.467 STEEM	cb8bc586518edbb39a1cf7f58bc393bbb93739b9
16	04/11/2021	97.733 STEEM	7ca45db51ad640fff9a671f1994370d63e97a9c5
17	04/12/2021	116.714 STEEM	876682059761875cbfdf8f9f9a62e8cc80ce9dad
18	04/13/2021	101.168 STEEM	8b7b7749a119f040bef914be138c8c91887b8413
19	04/14/2021	113.292 STEEM	466a7cb8e440235bbc01c3c66ab6d2720db1b03b
20	04/15/2021	100.875 STEEM	2ec954ee834eec07f0b16fae8892825613d40de7
21	04/16/2021	113.227 STEEM	e2558efb283c36b2560fe0db54f25534c375c9b8
22	04/17/2021	102.063 STEEM	47c69f7ac80560898f220c6b495292e0a82e01b3
23	04/18/2021	93.444 STEEM	37b85180cd497f074801694772669e1630d5a13e
24	04/19/2021	99.746 STEEM	74b969e233d8fdb52a08f5c1d1d81b392835ec0c
25	04/20/2021	107.535 STEEM	c7147e6e22727f67a87c44af98928d19f37aed20
26	04/21/2021	93.926 STEEM	a8cf8e4a4ecd64d5cfc2cfa11de238cad4c9234a
27	04/22/2021	92.355 STEEM	8bc76386443aa639050749b372dceeca3acfbdcd
28	04/23/2021	116.626 STEEM	2b43e5a02b10a3588ac3fe26e177cbe6350ad983
29	04/24/2021	92.774 STEEM	de2fb69d6c8e84463d10e7bbe9b448bc7b14b80b
30	04/25/2021	108.388 STEEM	0cf0078d1b084afbf9038a5d1c1f9777c1183150
31	04/26/2021	118.399 STEEM	ef73d04ff98f4dad8994a1d2dbfa5198a322c249
32	04/27/2021	101.666 STEEM	302c199c4d228706ba6ad1ee4b463a07027f3396
33	04/29/2021	117.227 STEEM	b9ae6c1494a0435c0c8e63f3ae08569979a9331d
34	04/30/2021	102.945 STEEM	8786921b2e97deeb8c9f97fa82409c3dd96048f3
35	05/01/2021	97.703 STEEM	f20aeea297689be58d4a0d1f84a4ebb1d35927b8
36	05/02/2021	104.907 STEEM	d17c79a280309830e95feb5ec831b4645c967ba9
37	05/03/2021	119.642 STEEM	392140f08d7c32a917089fd0368460bfda7b1ae9
38	05/04/2021	108.661 STEEM	20786c76049780440ec1f2b7f444f6b83e65082b
39	05/05/2021	101.375 STEEM	e6e6b18fb3e937417aa60ca72101b1169f29e074
40	05/06/2021	112.926 STEEM	7decdf3dbc9e962b9aef5114c7a1e4eac9ce3acc
41	05/07/2021	110.931 STEEM	7ef3389f0aba7e61a1f303277c53a4e5a5d0bb88
42	05/08/2021	105.372 STEEM	2cdbcd73c6e502ae03df6b9e4f640af3883c2841
43	05/09/2021	106.477 STEEM	47afefd555543dbf002d670bc750f86d3f9a40f6
44	05/10/2021	113.218 STEEM	47f3f3b455f5ecd68268d41a828921cc89434514
45	05/11/2021	95.354 STEEM	3e4b0a59cd8e332b3e8b0c8c763f09c55a7a9415
46	05/12/2021	117.302 STEEM	228ac9394869f3be894c3efe506125e9447f036d
47	05/13/2021	101.540 STEEM	3ae0e01f0292e244ad63c173d5e679b5156dd11e
48	05/14/2021	112.438 STEEM	05a52d073a9752dd2e5374a1d1cafbb845483106
49	05/15/2021	97.344 STEEM	2ba5350d2cebd501d57625c8c08ae0481df72ff4
50	05/16/2021	108.618 STEEM	269cf34165e4fda5ead78b2c602bace276beee2d
51	05/17/2021	102.666 STEEM	dfb3d7088fd086118da3aa65a363921e01584325
52	05/18/2021	91.063 STEEM	87f32041f67b5b77135e101d9c3ed176c6bced2c
53	05/19/2021	113.512 STEEM	2c4f2788bb8ac0e994648d813592ab7e53f2f4b1
54	05/20/2021	99.550 STEEM	18cde63b1cebd97a0a552473c0cf5425bc9f7df6
55	05/21/2021	104.834 STEEM	110a3d8030ad6758ffc821b8de737b34b10f343a
56	05/22/2021	91.542 STEEM	9ecd4c00de591d8d5ed54bcc37042e5e2ecfcc39
57	05/23/2021	98.242 STEEM	2691c7fd31740dcf361dca8ae9d11f867e9f8b16
58	05/24/2021	66.721 STEEM	65daf584aa045c94e63b5281ed43671e8724b66c

Total: 6,000.000 STEEM

Summary

The user golden-panther has been rewarded with twice the amount of the "donation" within 59 days.

Technical Analysis for STEEM

As the application coin-doubler has the potential to attract numerous investors, STEEM's price is expected to rise.

Technical Analysis for STEEM crypto currency

Boost My Wealth Challenge

If you want to participate from the Steem ecosystem's success, you can do so right now by following a few simple steps.

All author reward from this account will be paid out for an indefinite period of time to 8 participants per comment as Beneficiary Reward.

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If you have been wondering where I have been spending most of my time lately, I'm studying the many opportunities to achieve my Financial Prosperity presented by https://steemit.com/@abandi, and I'm working through the given steps.
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Type in abandi and click "SET PROXY". Currently this account is voting for the following witnesses as they are the ones who can ensure the safe operation of the Steem blockchain: beargame, cryptoking777, dev.supporters, dlike, enjoylondon, exnihilo.witness, future.witness, hinomaru-jp, hoasen, inwi, juddsmith079, justyy, leverfile, maiyude, matreshka, menacamel, parse, protoss20, rlawlstn123, rnt1, roadofrich, roundblocknew, scissor.sisters, smt-wherein, steem-agora, steem-dragon, steem-supporter, steem.history, steemchiller and upeross.
Invest for your bright future by buying some STEEM regularly and only selling some of the profit if necessary. (Think about the power of compound interest.)
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Beneficiaries of this post

Following users will receive 12.5% from the Author Reward each: alkaidbmw, antogrr, dinaicoy, edalexpp, hassan956, jjey, jsamael and sweet01.

Information for beneficiaries, your Upvote on this post will earn you an additional 12.5% Beneficiary Reward to your Curation Reward.

Users on the radar for upcoming Beneficiary Rewards

Following users have also appeared on the radar: adrianaascanio01, anymakeup, billiannys, emiljunior1, fatmawatiabbas, fedoseyev, gabyqb, gaogang1041, hyunc, karleidys, kimseonghun, kramgelo, lovemes, mdrubelrana, patete08, rhose25, saramunandaa, shohel44, teo34 and yygg666.

The decision has been difficult as always, but maybe it will work out in the next rounds. You get mentioned so that you at least get the attention of the followers. You have contributed to the Steem ecosystem's success as well, thank you.