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Bridge Comparison

Validating Bridge
Inter-Blockchain Communication (IBC)
Short-Term: Messages passed from the L2 rely on a trusted intermediary Long-Term: Trust-minimized
Configurable ISMs (Interchain Security Modules)
Validator-based, rules may vary per chain; proof-of-authority intermediary
Time to Finality
From Ethereum to L2: Fast Finality From L2 to Ethereum: Challenge Period
Based on the finality time of the origin chain, and a block on the destination.
Fast finality facilitated by Tendermint chain
Congestion Handling
Primary cost is unlocking ETH from the HTLC on Ethereum
Only worried about congestion on the chains being connected, as there is no Hyperlane chain.
Relayers in IBC have not yet broadly implemented a fee market. During congestion, end users will need to pay higher fees.
Censorship Resistance
Bridging into the L2 inherits the censorship resistance of Ethereum. Bridging back from the L2 inherits the CR of the sequencer set in the short-term, but will inherit Ethereum CR via forced inclusion in the long-term.
Censorship resistant by construction. Hyperlane’s permissionless nature ensures its neutrality, as it can be run without any dependency on external actors.
Bridging through IBC relies on a set of untrusted relayers and the validator set of the Polymer and external Cosmos chain. Messages will go through if there is one honest relayer and the chains will continue to make progress as long as there is an honest majority of validators.
Update Authority
Eclipse governance (TBD)
You retain and decide the upgrade authority for your warp routes, and you can control it for the Mailbox deployed on your chain or rollup.
To update one side of the bridge requires trusting the settlement of one network. To withdraw requires the settlement of the other network. Polymer acts as a router and does not hold funds directly on their bridge.
Additional Tools
Eclipse Canonical Bridge UI
Hyperlane Explorer; can be accessed via API.
Mintscan block explorer and open source light clients.