1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
# mutuala - subcurrency
# We want to issue a currency that reduces in value as you store it through negative interest.
# That negative interest would be stored in a commons account. It's like the p2p version of a
# capital tax
# the same things goes for transactions - you pay as you use the currency. However, the more
# you pay, the more you get to say about what the tax is used for
# each participant can propose a recipient for a payout to be made out of the commons account,
# others can vote on it by awarding it tax_credits.
# TODO should proposal have expiration timestamp?, after which the tax_credits are refunded
# TODO multiple proposals can take more credits that available in the Commons, how to handle this
# TODO how to handle lost accounts, after which no longer possible to get 2/3 majority
shared:
COMMONS = 42
ADMIN = 666
CAPITAL_TAX_PER_DAY = 7305 # 5% per year
PAYMENT_TAX = 20 # 5%
ACCOUNT_LIST_OFFSET = 2^160
ACCOUNT_MAP_OFFSET = 2^161
PROPOSAL_LIST_OFFSET = 2^162
PROPOSAL_MAP_OFFSET = 2^163
init:
contract.storage[ADMIN] = msg.sender
contract.storage[ACCOUNT_LIST_OFFSET - 1] = 1
contract.storage[ACCOUNT_LIST_OFFSET] = msg.sender
contract.storage[ACCOUNT_MAP_OFFSET + msg.sender] = 10^12
contract.storage[ACCOUNT_MAP_OFFSET + msg.sender + 1] = block.timestamp
# contract.storage[COMMONS] = balance commons
# contract.storage[ACCOUNT_LIST_OFFSET - 1] = number of accounts
# contract.storage[ACCOUNT_LIST_OFFSET + n] = account n
# contract.storage[PROPOSAL_LIST_OFFSET - 1] contains the number of proposals
# contract.storage[PROPOSAL_LIST_OFFSET + n] = proposal n
# per account:
# contract.storage[ACCOUNT_MAP_OFFSET + account] = balance
# contract.storage[ACCOUNT_MAP_OFFSET + account+1] = timestamp_last_transaction
# contract.storage[ACCOUNT_MAP_OFFSET + account+2] = tax_credits
# per proposal:
# contract.storage[PROPOSAL_MAP_OFFSET + proposal_id] = recipient
# contract.storage[PROPOSAL_MAP_OFFSET + proposal_id+1] = amount
# contract.storage[PROPOSAL_MAP_OFFSET + proposal_id+2] = total vote credits
code:
if msg.data[0] == "suicide" and msg.sender == contract.storage[ADMIN]:
suicide(msg.sender)
elif msg.data[0] == "balance":
addr = msg.data[1]
return(contract.storage[ACCOUNT_MAP_OFFSET + addr])
elif msg.data[0] == "pay":
from = msg.sender
fromvalue = contract.storage[ACCOUNT_MAP_OFFSET + from]
to = msg.data[1]
if to == 0 or to >= 2^160:
return([0, "invalid address"], 2)
value = msg.data[2]
tax = value / PAYMENT_TAX
if fromvalue >= value + tax:
contract.storage[ACCOUNT_MAP_OFFSET + from] = fromvalue - (value + tax)
contract.storage[ACCOUNT_MAP_OFFSET + to] += value
# tax
contract.storage[COMMONS] += tax
contract.storage[ACCOUNT_MAP_OFFSET + from + 2] += tax
# check timestamp field to see if target account exists
if contract.storage[ACCOUNT_MAP_OFFSET + to + 1] == 0:
# register new account
nr_accounts = contract.storage[ACCOUNT_LIST_OFFSET - 1]
contract.storage[ACCOUNT_LIST_OFFSET + nr_accounts] = to
contract.storage[ACCOUNT_LIST_OFFSET - 1] += 1
contract.storage[ACCOUNT_MAP_OFFSET + to + 1] = block.timestamp
return(1)
else:
return([0, "insufficient balance"], 2)
elif msg.data[0] == "hash":
proposal_id = sha3(msg.data[1])
return(proposal_id)
elif msg.data[0] == "propose":
from = msg.sender
# check if sender has an account and has tax credits
if contract.storage[ACCOUNT_MAP_OFFSET + from + 2] == 0:
return([0, "sender has no tax credits"], 2)
proposal_id = sha3(msg.data[1])
# check if proposal doesn't already exist
if contract.storage[PROPOSAL_MAP_OFFSET + proposal_id]:
return([0, "proposal already exists"])
to = msg.data[2]
# check if recipient is a valid address and has an account (with timestamp)
if to == 0 or to >= 2^160:
return([0, "invalid address"], 2)
if contract.storage[ACCOUNT_MAP_OFFSET + to + 1] == 0:
return([0, "invalid to account"], 2)
value = msg.data[3]
# check if there is enough money in the commons account
if value > contract.storage[COMMONS]:
return([0, "not enough credits in commons"], 2)
# record proposal in list
nr_proposals = contract.storage[PROPOSAL_LIST_OFFSET - 1]
contract.storage[PROPOSAL_LIST_OFFSET + nr_proposals] = proposal_id
contract.storage[PROPOSAL_LIST_OFFSET - 1] += 1
# record proposal in map
contract.storage[PROPOSAL_MAP_OFFSET + proposal_id] = to
contract.storage[PROPOSAL_MAP_OFFSET + proposal_id + 1] = value
return(proposal_id)
elif msg.data[0] == "vote":
from = msg.sender
proposal_id = sha3(msg.data[1])
value = msg.data[2]
# check if sender has an account and has tax credits
if value < contract.storage[ACCOUNT_MAP_OFFSET + from + 2]:
return([0, "sender doesn't have enough tax credits"], 2)
# check if proposal exist
if contract.storage[PROPOSAL_MAP_OFFSET + proposal_id] == 0:
return([0, "proposal doesn't exist"], 2)
# increase votes
contract.storage[PROPOSAL_MAP_OFFSET + proposal_id + 2] += value
# withdraw tax credits
contract.storage[ACCOUNT_MAP_OFFSET + from + 2] -= value
# did we reach 2/3 threshold?
if contract.storage[PROPOSAL_MAP_OFFSET + proposal_id + 2] >= contract.storage[COMMONS] * 2 / 3:
# got majority
to = contract.storage[PROPOSAL_MAP_OFFSET + proposal_id]
amount = contract.storage[PROPOSAL_MAP_OFFSET + proposal_id + 1]
# adjust balances
contract.storage[ACCOUNT_MAP_OFFSET + to] += amount
contract.storage[COMMONS] -= amount
# reset proposal
contract.storage[PROPOSAL_MAP_OFFSET + proposal_id] = 0
contract.storage[PROPOSAL_MAP_OFFSET + proposal_id + 1] = 0
contract.storage[PROPOSAL_MAP_OFFSET + proposal_id + 2] = 0
return(1)
return(proposal_id)
elif msg.data[0] == "tick":
nr_accounts = contract.storage[ACCOUNT_LIST_OFFSET - 1]
account_idx = 0
tax_paid = 0
# process all accounts and see if they have to pay their daily capital tax
while account_idx < nr_accounts:
cur_account = contract.storage[ACCOUNT_LIST_OFFSET + account_idx]
last_timestamp = contract.storage[ACCOUNT_MAP_OFFSET + cur_account + 1]
time_diff = block.timestamp - last_timestamp
if time_diff >= 86400:
tax_days = time_diff / 86400
balance = contract.storage[ACCOUNT_MAP_OFFSET + cur_account]
tax = tax_days * (balance / CAPITAL_TAX_PER_DAY)
if tax > 0:
# charge capital tax, but give tax credits in return
contract.storage[ACCOUNT_MAP_OFFSET + cur_account] -= tax
contract.storage[ACCOUNT_MAP_OFFSET + cur_account + 1] += tax_days * 86400
contract.storage[ACCOUNT_MAP_OFFSET + cur_account + 2] += tax
contract.storage[COMMONS] += tax
tax_paid += 1
account_idx += 1
return(tax_paid) # how many accounts did we charge tax on
else:
return([0, "unknown command"], 2)
|