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Added glossary explaning Denomination Key #7330

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Sep 16, 2020
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Added glossary explaning Denomination Key #7330

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6 changes: 6 additions & 0 deletions docs/architecture/adr-004-split-denomination-keys.md
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- 2020-01-14: Updates from review feedback
- 2020-01-30: Updates from implementation


### Glossary

* denom / denomination key -- unique token identifier.


## Context

With permissionless IBC, anyone will be able to send arbitrary denominations to any other account. Currently, all non-zero balances are stored along with the account in an `sdk.Coins` struct, which creates a potential denial-of-service concern, as too many denominations will become expensive to load & store each time the account is modified. See issues [5467](https://github.com/cosmos/cosmos-sdk/issues/5467) and [4982](https://github.com/cosmos/cosmos-sdk/issues/4982) for additional context.
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