Chain Name System

Overview

Chain Name Service (CNS)

The CNS module is a new Cosmos SDK module that allows Cosmos addresses to purchase, sell, and administer chain names.

Why Cosmos Hub needs a CNS

For the Cosmos Hub to function as an interchain router, it needs to access a canonical list of chain names. For example, token holders on the Hub need a trusted way to determine that, e.g., IRIS tokens on the Hub are actually from the IRISnet mainnet. If the Hub decides to add services like DEXes onto the Hub, trusted chain names allow token holders to more quickly verify ticker symbols and provide liquidity to the right pools.

A CNS on the Hub will provide security to interchain transfers by registering chain names, this will allow proper token tracking for every token transferred onto cosmos hub and off the cosmos hub. The cosmos hub will then become the defacto hub with all other zones relying on the trusted setup on the hub to define valid tokens. This value proposition will contribute to the growth of the ATOM.

While the CNS can exist on another chain and function correctly, we think that the CNS has the most aligned incentives with the Cosmos Hub. By adopting this module, ATOM stakers will be securing a crucial component of the interchain and will move us further into the direction of a Hub-centric model of Cosmos.

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Comments
  • Issues with proving two clients belong to same chain

    Issues with proving two clients belong to same chain

    Description

    Ref: #2 As one of the applications of CNS, we wanted to provide a balance query which identifies the chain from which the token was transferred. This is a wrapper around bank's GetBalance in order to make it easier for users to understand which token they have rather than looking at hash e.g.. 100ibc/C053D637CCA2A2BA030E2C5EE1B28A16F71CCB0E45E8BE52766DC1B241B77878 will be resolved as 100ibc/stake/testchain1

    Problem:

    Let's say there's C1 and C2. C1 is registered as part of CNS and mapped to a particular chain, but C2 was used for the transfer. We want to prove both C1 and C2 belong to the same chain and thereby resolve the token hash

    The plan was to compare client states of both C1 and C2 with custom fields zeroed out. In order to ensure that C2 is not from a chain which duplicated original chain's parameters, we're trying to compare the consensus states of C1 and C2. The problem is we have the consensus states at different heights which make it impossible to compare consenus states.

    Proposed Solutions:

    1. We store a primary client ID in CNS and resolve it accordingly by doing a query for consensus states Pros: This approach is straight forward and won't require any changes from ibc modules Cons: The main issue being this may not be suitable for all use-cases as this involve multiple queries This helps only wallets/explorers to resolve the ibc denom hashes as belonging to a particular chain

    2. Alternatively we can have a hook on cns side to register every client created to it's respective chain Id. Pros: This helps all users to be able to query their balances using cns, provided the chain is registered in cns Cons: For this we expect all the necessary implementation to be present in ibc module. We may also need to iterate over all the chain info registered to establish the link. This may also register in a significant increase in state size of cns module, though we want to encourage reuse of clients for transfers.

    Is there a preferred method on how we want to do this, or any practices suggested by ibc team on what's the best way to utilise ibc module in applications like cns?

    cc\ @fadeev @okwme @hxrts @cwgoes @AdityaSripal @colin-axner

    opened by sahith-narahari 7
  • Add RPC endpoints to spec

    Add RPC endpoints to spec

    Currently the spec makes no mention of RPC endpoints. Because we need them for relayer, wallet and statesync operation I think we should include them in the spec.

    opened by jackzampolin 0
  • Epic: CNS Module

    Epic: CNS Module

    Phase-0 Chain Directory

    By the end of Phase-0, we want to deliver a directory of chain names for Cosmos SDK chains that currently exist. For expediency, we plan on setting up a multisig that initially has the authority to modify information about blockchains on the CNS. After all existing major blockchains are recorded on the CNS and M-0 is completed the multisig will hand off these chain names one by one to trusted parties from the various sovereign Cosmos chain communities.

    • [x] Implementation Spec
    • [x] Types Definition - #7
    • [x] Keeper implementation - #8
    • [ ] Genesis State definition
    • [x] CLI - #13
    • [ ] Simulations
    Epic 
    opened by sahith-narahari 0
Owner
Tendermint
Bringing simplicity, security, and speed to the world's blockchains.
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