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## Bridges ## bridges
<br> <br>
### Centralized Bridge ### centralized
<br>
* Centralized bridges are essentially hot wallets straddling the fence between multiple chains. * Centralized bridges are essentially hot wallets straddling the fence between multiple chains.
* They hold a user’s assets on one chain and issue them a corresponding amount of tokens on another chain. * They hold a user’s assets on one chain and issue them a corresponding amount of tokens on another chain.
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* The security risks of a centralized bridge are the same security risks that exist for exchanges and custodians. * The security risks of a centralized bridge are the same security risks that exist for exchanges and custodians.
* Their primary responsibility is securing private keys (key management), and as a result centralized bridges have proven to be pretty secure. * Their primary responsibility is securing private keys (key management), and as a result centralized bridges have proven to be pretty secure.
<br>
### Proof of Stake Bridge ### proof-of-stake bridge
<br>
* Proof of Stake bridges are like little blockchain networks narrowly focused on facilitating cross-chain activity. * Proof of Stake bridges are like little blockchain networks narrowly focused on facilitating cross-chain activity.
* Whereas centralized bridges are managed by a single entity, proof of stake bridges are managed by a group. * Whereas centralized bridges are managed by a single entity, proof of stake bridges are managed by a group.
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* Because POS bridges involve both smart contracts and a group of centralized gatekeepers, they inherit all the code risk of Web 3 and the traditional security risks of Web 2 (key management, access controls). * Because POS bridges involve both smart contracts and a group of centralized gatekeepers, they inherit all the code risk of Web 3 and the traditional security risks of Web 2 (key management, access controls).
* POS bridges have the most attack vectors, and have unfortunately been the victims of most of the major exploits. * POS bridges have the most attack vectors, and have unfortunately been the victims of most of the major exploits.
<br>
### Decentralized Bridge ### decentralized bridge
<br>
* Decentralized bridges take a proof of deposit from one chain and validate it on the other chain (ex: Polygon Plasma Bridge). * Decentralized bridges take a proof of deposit from one chain and validate it on the other chain (ex: Polygon Plasma Bridge).
* Decentralized bridges are all code. They don’t rely on centralized signers/validators, so while there’s more code risk, they don’t have to worry about the traditional security risks that POS bridges deal with. * Decentralized bridges are all code. They don’t rely on centralized signers/validators, so while there’s more code risk, they don’t have to worry about the traditional security risks that POS bridges deal with.