Exclusive reserves for pallet-balances

[xlc]

Currently the reserved balances are shared. Every pallets that uses reserve feature should keep a record how much is reserved so later it can unreserve / slash the same amount. Otherwise if deposits changes, a wrong value will be unserved / slashed.

Given that we should always have the reserved amount stored somewhere (or you may have bugs), we should just have pallet-balances (or another pallet) to do the bookkeeping. Also fund reserved by different pallets should not be shared. Reserve from pallet-identity cannot be used by pallet-proxy. This will simplify code, eliminates a category of bugs, and improve UX (How do I unreserve my money?).

Examples of extra deposit bookkeeping codes:

substrate/frame/identity/src/lib.rs

Lines 377 to 378 in 596f377

	/// Amount held on deposit for this information.
	pub deposit: Balance,

substrate/frame/treasury/src/lib.rs

Lines 275 to 276 in 596f377

	/// The amount held on deposit (reserved) for making this proposal.
	bond: Balance,

substrate/frame/treasury/src/lib.rs

Lines 295 to 296 in 596f377

	/// The amount held on deposit for this tip.
	deposit: Balance,

substrate/frame/indices/src/lib.rs

Line 79 in 596f377

): map hasher(blake2_128_concat) T::AccountIndex => Option<(T::AccountId, BalanceOf<T>, bool)>;

substrate/frame/proxy/src/lib.rs

Lines 157 to 160 in 596f377

	/// The set of account proxies. Maps the account which has delegated to the accounts
	/// which are being delegated to, together with the amount held on deposit.
	pub Proxies: map hasher(twox_64_concat) T::AccountId
	=> (Vec<ProxyDefinition<T::AccountId, T::ProxyType, T::BlockNumber>>, BalanceOf<T>);

Missing bookkeeping:

substrate/frame/elections-phragmen/src/lib.rs

Line 828 in 596f377

T::Currency::unreserve(who, T::VotingBond::get());

substrate/frame/elections-phragmen/src/lib.rs

Line 581 in 596f377

T::Currency::unreserve(&who, T::CandidacyBond::get());

I suspect some fund may already be locked forever for early Kusama council voters as the deposit have decreased once.

This will at same time closes #6724

[xlc]

Take this account for example (picked randomly)

https://polkascan.io/kusama/account/DwFd1YbZD2cZjox1CrsdDXFVsnSY8Fw2YWgcVgeaxrvwYfv#transactions

Reserved 0.05 KSM to electionsPhragmen.vote, the currently the VotingBond is 0.00833. This means 0.04167 KSM is inaccessible anymore.

[kianenigma]

+1

---

Accounts that technically lost some money due to this bug can and should be fixed through governance.

And the elections module will transition to bookkeeping in this PR #7040

[kianenigma]

Would be good to sweep and clean these incidents before they get too old.

[kianenigma]

@xlc I want to move on with the above PR, but if the issue that you named has happened, I should clean that first. Are you sure the voting bond has changed in kusama? it seem to be 5 * some power of ten even now:

https://github.com/paritytech/polkadot/blob/15ba4efdab9e228797cafb817753ae38fa1114c7/runtime/kusama/src/lib.rs#L457

[xlc]

This is the change reduce all the fees on Kusama https://github.com/paritytech/polkadot/pull/1252/files#diff-50080fd40b82a07448f519b041450378R22

---

Use state_getMetadata, you can query historical metadata which includes the constants.

This is on block 100

          constants: [
            {
              name: CandidacyBond,
              type: BalanceOf,
              value: 0x0010a5d4e80000000000000000000000,
              documentation: []
            },
            {
              name: VotingBond,
              type: BalanceOf,
              value: 0x00743ba40b0000000000000000000000,
              documentation: []
            },
            {
              name: DesiredMembers,
              type: u32,
              value: 0x0d000000,
              documentation: []
            },
            {
              name: DesiredRunnersUp,
              type: u32,
              value: 0x07000000,
              documentation: []
            },
            {
              name: TermDuration,
              type: BlockNumber,
              value: 0xb0040000,
              documentation: []
            }
          ],

This is on a recent head

constants: [
            {
              name: CandidacyBond,
              type: BalanceOf,
              value: 0xaa821bce260000000000000000000000,
              documentation: []
            },
            {
              name: VotingBond,
              type: BalanceOf,
              value: 0x5293b4f0010000000000000000000000,
              documentation: []
            },
            {
              name: DesiredMembers,
              type: u32,
              value: 0x13000000,
              documentation: []
            },
            {
              name: DesiredRunnersUp,
              type: u32,
              value: 0x13000000,
              documentation: []
            },
            {
              name: TermDuration,
              type: BlockNumber,
              value: 0x40380000,
              documentation: []
            },
            {
              name: ModuleId,
              type: LockIdentifier,
              value: phrelect,
              documentation: []
            }
          ],

You can see the voting bond changed from 0x00743ba40b0000000000000000000000 (50000000000) to 0x5293b4f0010000000000000000000000 (8333333330)

[kianenigma]

I'll try and prepare a scrape of the chain that includes the list of all accounts affected soon.

[kianenigma]

Here are the list of accounts that need to be refunded:

5DG3v61P5seTdC3yJR8nuKVxXkHKJct3b5Q6KvrQ7qmXuWhJ
5E39DTEFLdPdxdbvDnE9qcxBwhwCHoFS4ffNAVYnzQwz6DMs
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5EcXdrCstZL1HdfWtwX1ywebZdwGZzVbZ2iBYzez6z8sqGH7
5DLDHUJkdtxXT1eXgp8htR9ZtUSnj4uSmrNL48Qv1HBuJPdy
5DUZfUDtVkzdHQ9cWBhd8NzLW8JS9qQKncvKXgL68Vy6Pr1G
5GNUdXAK5Gt8hKCTMTdQhUeqWRtNH28TCK76kEEQf5MsDLTx
5FbHuEgZd9YyVXhKcoGj5DjySDBKQGrQTpfB3dCjJNQBAnv7
5HTaCfEuoWA5WcW8Nrro2UF3PEAyv9jnyZ7czKHbBi37udTD
5H6UyPrZVw5YiN3ARuWbWMVXWjBVq9qLxK2WDxGnQVYTcE21
5CXto821p4219j4KkpQT7PMFnQZyUuoCDUcWfnvHx5WQBWqV
5F787L37mP2zvyQvzK3EkkzCof2uHvqJMLC1CQsJHQb59bLx
5ELMY6ag9ebMRzAoihUMkNen8dLiV2vKxkeJjfKGVVmRDyXX
5G45rUGvACYhaFLKoxdm5VtqqmW2oXhWhY5aMWzXb28dktBK
5Gs3SseAmfDfqbku1kPCCBXsbUPdt9beEPWGKwRX9rfqeLEH
5ED8TzmCB6gWV8TDBe9rmDYhrQVQ4fVh8gYYYkZQoPdBhxDp
5Fs1zHdRefsjaRd4QQec9qFGKjDbygqxr2TLDHaNaq6XHPSp
5CLbSiojZeN9evPAipW2tjPSrWdFSRsZG5oi5A6JaXamnNkM
5FjcTi3XxGATFftBhm8nmVHRjsREuEjZ9ksXsyfQ3zx5d2mb
5FtEEfxEdXX5nM5gekhuoWcwWfhW66TtDdcJiBDaCezpF6ex
5DoXGL1Vejra9Gszf6Fn7c4gx7cxR6GyEaUKFhoPn1MW3nen
5DRdxhCivr1gp5zWEW3pjGAFMHWCjTSkaAfwDqQh7AeSCMxz
5GGzikxce87ot869p6Gc4b5qGDbQ8pL3g5cQXZ9Wmxid61oz
5Fq7vdZQCQg51vEryiF7B9Hs8DP4geiLAqL9syy9KGzbMpG6

This is basically a scrape of PhragmenElection -> Voting at 715dbf4012cdca810bcb2dca507d856e3fa719f3cf072058a2be378fd3aedeeb. Why this block? because the runtime that caused this issue was 2008. How? we check for CodeUpdated events, and this is the block: https://polkascan.io/kusama/block/2728002. See the runtime version here and in parent.

Once someone else confirms the list, I'll move forward.

[jacogr]

EDIT: short explanation as to how I got to my list -

• added the keysAt API for all queries (it was logged, this was the right time to close it)
• did the same query as above via const keys = await api.query.phragmenElection.voting.keysAt(HASH)
• converted the results to ss58 42 via const conv = keys.map(({ args }) => hashing.encodeAddress(args[0))

(All in the JS console on the apps UI)

My list, 192 ids (converted to 42) -

5DG3v61P5seTdC3yJR8nuKVxXkHKJct3b5Q6KvrQ7qmXuWhJ
5E39DTEFLdPdxdbvDnE9qcxBwhwCHoFS4ffNAVYnzQwz6DMs
5DksjtJER6oLDWkWKCWcL3f1swPWeNNFsS9zHxa2rPa7LsH9
5EHtsznYqX7CPBJSVr1K1cc69aTmixo1cY4b8Fzmky1QC7NH
5Ca6ZhWygEUQaDAzcibjwAbH5iQ786LW5iW4sHedBS1N7AoD
5HGN9UPNrtZ3vMwyxj7koXuRnZXfSYccwhopm7whoELDJwxU
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5Dr4eTui3LTVpSEDyDhuR1qEFMS5RqT5F3XUD7ProqH2SRHK
5GYQdZsivpSdNSkPwFGCAMi42rqowbpT3Ra55ygvwm9PYkoX
5DA6n2fyD1z5UYmCytM3ANfEE2bGS9TZgFpPYzjNgsGY88gd
5G6UjfRUVYwHNBZaGvhqAjhpV7UCMvD8s9Z8rkpP75hTcVVs
5C5AfriAKwtkxAdyRK7UYw7rq9EJwZGvhGvyJ7jdBFtv3Pj7
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5EDAyEEbsM9hqCpAhNswMe3xYRSxpEbmFRUevVekXqorzybN
5F9ky7EPE29134XGHx47UsYfrTszLjCtmEaP7KpiWTe3aT8G
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5GEeUi1dV2NtFBZgMorkdoFPjEuLtJh141crBX2RU3aqr25K
5CJviDSfZekTdmd5ab7iFH7uYeZ3wFuvHpXKNDRssq2KeSWD
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5DFYZryC5qYMJziGdFQEWWaJTzDZbcN1VraSTHd1ubjJ78TQ
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[kianenigma]

An important first step toward this is to be able to correctly de-compose the current reserved balance of each account into separate modules. We worked with @shawntabrizi on a small half-finished script to do this a while ago. I couldn't finish it because in the case of anonymous proxies and multisig accounts, it gets a bit complicated.