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你有没有发现你STEEM钱包里面SP每天一点点的增加？

想要了解这个问题，先看看白皮书里关于SP部分的解说：

Starting with the network’s 16th hard fork in December 2016, Steem began creating new tokens at an annual inflation rate of 9.5%. The inflation rate decreases at a rate of 0.01% every 250,000 blocks, or about 0.5% per year. The inflation will continue decreasing at this pace until the overall inflation rate reaches 0.95%. This will take about 20.5 years from the time hard fork 16 went into effect. Of the new tokens that are generated, 75% go to fund the reward pool, which is split between authors and curators. Another 15% of the new tokens are awarded to holders of SP. The remaining 10% pays for the witnesses to power the blockchain.

从HF16开始，每年STEEM会通货膨胀产生9.5%的代币。通货膨胀率以每250，000个区块递减0.01%（每年大概递减0.5%）。
通货膨胀率将持续递减到0.95%（大概20.5年时间）。
新产生的代币将有75%放入奖金池，15%给予每位SP的持有者，10%给予见证人。

这是未来30年STEEM的数量，通货膨胀率和每年产生的STEEM的数量。

Year Supply Inflation New Supply
2016 250,000,000 9.50% 23,750,000
2017 273,750,000 9.08% 24,854,398
2018 298,604,398 8.66% 25,854,554
2019 324,458,952 8.24% 26,727,942
2020 351,186,894 7.82% 27,452,027
2021 378,638,921 7.40% 28,004,740
2022 406,643,661 6.98% 28,364,989
2023 435,008,650 6.55% 28,513,181
2024 463,521,832 6.13% 28,431,762
2025 491,953,593 5.71% 28,105,742
2026 520,059,335 5.29% 27,523,204
2027 547,582,539 4.87% 26,675,768
2028 574,258,308 4.45% 25,558,997
2029 599,817,304 4.03% 24,172,733
2030 623,990,038 3.61% 22,521,348
2031 646,511,386 3.19% 20,613,886
2032 667,125,272 2.77% 18,464,106
2033 685,589,378 2.35% 16,090,399
2034 701,679,777 1.93% 13,515,587
2035 715,195,364 1.51% 10,766,608
2036 725,961,973 1.08% 7,874,074
2037 733,836,047 0.95% 6,971,442
2038 740,807,489 0.95% 7,037,671
2039 747,845,160 0.95% 7,104,529
2040 754,949,689 0.95% 7,172,022
2041 762,121,711 0.95% 7,240,156
2042 769,361,868 0.95% 7,308,938
2043 776,670,805 0.95% 7,378,373
2044 784,049,178 0.95% 7,448,467
2045 791,497,645 0.95% 7,519,228

回到这篇帖子的主题，为什么帐号上的SP数量每天都在增长？
之前说过了，新产生的代币将有75%放入奖金池，15%给予每位SP的持有者，10%给予见证人。

新产生的代币将有15%给予每位持有者，我们来算算，如果你持有100SP，每天将会获得多少SP?

目前我们大约有324,074,116 STEEM
通货膨胀率大概8.24%.
一年的通货膨胀获得的SP数量：100SP * 0.0824 * 0.15 = 1.236 SP
一天的通货膨胀获得的SP数量：1.236SP/365 = 0.0034SP

所以你一年啥都不做，SP的数量会自动增长1.236%

之前就有人嘲笑STEEM的这个机制。
自己先预挖了100万个代币，然后每年设置5%的通货膨胀率，什么都不做每年收入5万个代币。

他说的不无道理，但是这不也是普通货币做的事吗？

参考资料

STEEM Whitepaper
THE INFLATION OF STEEM OVER THE NEXT 30 YEARS!