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BlockchainPublic & Permissionless NetworkP&PN NotesPermissioned OnboardingPO NotesTransparent SupplyTS NotesOn-Chain AnalyticsFreeze/SeizeF&S Notes
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AleoYesAleo is a public and permissionless layer-1 blockchain focused on privacy, that allows users to create transactions and deploy code on the network.

https://aleo.org/post/aleo-mainnet-faq

https://aleo.org/post/what-is-aleo-the-privacy-first-blockchain/ 
NoAleo focuses on privacy-preserving smart contracts and does not provide mechanisms for customizing validator sets beyond standard consensus participation.

https://aleo.org/faq/

https://github.com/AleoNet/snarkOS/blob/staging/README.md
YesYes, Aleo block explorer is available at:
https://explorer.provable.com/
NoNoNo example of fiat-backed stablecoins existing on Aleo's mainnet with freeze and seize functionality were found, nor any known F&S capabilities through native token, smart contract, or on-chain functionality.
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AlgorandYesAlgorand is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://algorandtechnologies.com/technology/solving-the-blockchain-trilemma 
YesAlgorand announced permissioned “Co-Chains” in 2020, but no further documentation was found.

https://assets.website-files.com/62835f42aef969049eba0806/62d58aa78533b4ac26547501_Algorand%20Co-Chains%20(March%202020).pdf

However, permissioned onboarding can still be facilitated through whitelisting of public addresses. This could be accomplished by setting the “DefaultFrozen” parameter for a token using the Algorand Standard Asset (ASA) protocol to “true.”

https://developer.algorand.org/docs/get-details/asa/
YesYes, Algorand block explorer is available at:
https://allo.info/
YesYesAlgorand offers freeze and seize (as “Clawback”) functionality as part of its Algorand Standard Assets (ASA)https://www.ccn.com/education/algorand-algo-a-blockchain-breakthrough-in-smart-contract-speed-and-efficiency/

https://developer.algorand.org/docs/get-details/asa/
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ArbitrumYesArbitrum is a public and permissionless layer-2 blockchain built on Ethereum, that allows users to create transactions and deploy code on the network.

https://docs.arbitrum.io/welcome/arbitrum-gentle-introduction
YesArbitrum Orbit facilitates deployment of customized Arbitrum Rollup and AnyTrust chains, which can restrict contract deployment to a single application.

https://docs.arbitrum.io/launch-orbit-chain/orbit-gentle-introduction
YesYes, Arbitrum block explorer is available at:
https://arbiscan.io/
YesYesArbitrum is a layer-2 network on top of Ethereum, and therefore uses the Solidity programming language for smart contracts. The freeze and seize functionality featured in USDP and PYUSD stablecoins on Ethereum are applicable by extension.

https://github.com/paxosglobal/usdp-contracts

https://github.com/paxosglobal/pyusd-contract
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AvalancheYesAvalanche is a public and permissionless layer-1 blockchain with subnet functionality, that allows users to create transactions and deploy code on the network.

https://docs.avax.network/learn 
YesAvalanche supports customizable subnets, enabling configurations that require permission for validators and users, thereby facilitating permissioned layer-1 instances.

https://docs.avax.network/protocol/avalanche-l1shttps://support.avax.network/en/articles/4064861-what-is-an-avalanche-l1
YesYes, Avalanche block explorer (C-Chain) is available at:
https://subnets.avax.network/c-chain
YesYesThe Avalanche C-Chain is designed to support Ethereum-compatible smart contracts, and therefore uses the Solidity programming language for smart contracts. The freeze and seize functionality featured in USDP and PYUSD stablecoins on Ethereum are applicable by extension.

https://github.com/paxosglobal/usdp-contractshttps://github.com/paxosglobal/pyusd-contract

Avalanche Subnets may also provide further customizability for freeze and seize.
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BaseYesBase is a public and permissionless layer-2 blockchain built on Ethereum, that allows users to create transactions and deploy code on the network.

https://www.base.org/

https://docs.base.org/docs/
YesBase is built on the OP Stack and deployed by Coinbase, and therefore does not have customizable validator nodes. However, permissioned onboarding can be facilitated through the whitelisting of public addresses via smart contract. An example of this is in the original EUR CoinVertible stablecoin deployed by Societe Generale on Ethereum, which uses the same Solidity programming language as the OP Stack for smart contracts:

https://etherscan.io/address/0xf7790914dc335b20aa19d7c9c9171e14e278a134#code
YesYes, Base block explorer is available at:
https://basescan.org/
YesYesBase is a layer-2 network on top of Ethereum (via the OP Stack), and therefore uses the Solidity programming language for smart contracts. The freeze and seize functionality featured in USDP and PYUSD stablecoins on Ethereum are applicable by extension.

https://github.com/paxosglobal/usdp-contracts

https://github.com/paxosglobal/pyusd-contract
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Binance (BNB Chain)YesBinance’s BNB Smart Chain (BSC) is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://docs.bnbchain.org/bnb-smart-chain/
YesBSC offers the ability to control user onboarding through customizable validators and permissioned sidechains, known as the Binance Application Sidechain (BAS).

BAS allows developers to create their own sidechains with tailored parameters, including governance models and validator sets. This means that access to the blockchain can be controlled, and specific onboarding requirements can be enforced.

https://github.com/bnb-chain/bas-template-bsc
YesYes, Binance block explorer available at:
https://bscscan.com/
YesYesThe Binance Smart Chain is designed to support Ethereum-compatible smart contracts, and therefore uses the Solidity programming language for smart contracts. The freeze and seize functionality featured in USDP and PYUSD stablecoins on Ethereum are applicable by extension.

https://github.com/paxosglobal/usdp-contractshttps://github.com/paxosglobal/pyusd-contract
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Canton (DAML)NoCanton is a public-permissioned “network of networks” typically used by regulated financial institutions and requiring onboarding for users.

https://www.digitalasset.com/hubfs/Canton/Canton%20Network%20-%20White%20Paper.pdf

https://www.canton.network/protocol#:~:text=Segregated%20private%20sync%20domains
YesThe Canton Network supports permissioned onboarding, allowing institutions to control who can access the network.

https://www.canton.network/faq

https://www.digitalasset.com/hubfs/Canton/Canton%20Network%20-%20White%20Paper.pdf
YesYes. Canton is a blockchain protocol for linking Daml applications across participants and organizations. Daml defines who is entitled to see, and who is authorized to change any given contract.

Canton enforces these visibility and authorization rules, and ensures transaction integrity with very high levels of privacy, even in the presence of malicious actors.

https://www.canton.network/protocol
NoYesCanton demonstrated the ability to seize collateral in real-time during a default scenario in a pilot involving tokenized U.S. Treasuries.

https://www.digitalasset.com/hubfs/Canton%20Network%20Files/Canton%20Network%20Pilot%20Program/unlocking-collateral-mobility-through-tokenization-us-treasuries-use-case.pdf
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CardanoYesCardano is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://cardano.org/discover-cardano
YesCardano uses Ouroboros, a proof-of-stake protocol where validators (stake pools) are selected based on stake, but the protocol itself does not allow for arbitrary customization of validator sets.

However, permissioned onboarding can be facilitated through the whitelisting of public addresses via smart contract using Plutus.

https://developers.cardano.org/docs/smart-contracts/plutus/
YesYes, Cardano block explorer is available at:
https://explorer.cardano.org/
YesNoCardano does not natively support freeze and seize of tokens at the chain level. Neither the algorithmic Djed or fiat-backed USDM (Moneta, fka Mehen) stablecoins on Cardano have freeze & seize capabilities.

Midnight can serve as a layer-2 solution for interoperability across the EVM and therefore could have the same features as USDP / PYUSD as noted throughout. However, Midnight has not yet been deployed.

https://midnight.network/
https://docs.midnight.network/
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CosmosYesCosmos is an ecosystem of interconnected blockchains designed to be scalable, customizable, and interoperable.

https://cosmos.network/whitepaper
YesPermissioned onboarding can be facilitated by Cosmos SDK customization, or Tendermint Core.

https://v1.cosmos.network/resources/whitepaper

https://tutorials.cosmos.network/academy/2-cosmos-concepts/14-interchain-security.html
YesYes, Cosmos block explorer is available at:
https://www.mintscan.io/cosmos
YesYesCosmos/Tendermint (consensus engine) alone cannot freeze or seize tokens; however, custom applications built on top of it using frameworks like the Cosmos SDK could implement such features if desired by developers.

However, Tendermint itself does not dictate what those transactions are or how they are processed. It is agnostic to the application logic, which is implemented via the Application Blockchain Interface (ABCI) https://docs.tendermint.com/v0.33/tendermint-core/using-tendermint.htmlhttps://v1.cosmos.network/resources/whitepaper
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Dfinity (Internet Computer)YesThe Internet Computer is a public and permissionless blockchain that allows users to deploy applications via “canisters.”

https://internetcomputer.org/what-is-the-ic
YesThe Internet Computer operates with a multi-subnet architecture, where each subnet is a collection of nodes that work together to process smart contracts (canisters).
https://internetcomputer.org/how-it-works#Smart-contracts

Canister-Level Whitelisting: Developers can create smart contracts that only allow interactions from certain public addresses, effectively controlling who can interact with specific applications or services on the Internet Computer. 
https://internetcomputer.org/docs/current/developer-docs/daos/sns/managing/sns-asset-canister/#configuring-an-asset-canisters-permissions
YesYes, Dfinity block explorer is available at:
https://dashboard.internetcomputer.org/
NoYesSmart contracts on ICP can directly interact with the Ethereum network and other networks that are using the Ethereum Virtual Machine (EVM), such as Polygon and Avalanche. This integration is possible thanks to ICP's HTTPS outcalls and threshold ECDSA features, which allow Ethereum transactions to be queried and ICP smart contracts to sign and submit transactions to Ethereum.

Canisters deployed on ICP are able to communicate with the Ethereum blockchain and other EVM-compatible networks using the EVM RPC canister. This canister sends API requests to JSON-RPC services such as CloudFlare, Alchemy, Ankr, BlockPI, or Public Node using HTTPS outcalls.

https://internetcomputer.org/docs/current/developer-docs/multi-chain/ethereum/overview
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EOSYesEOS is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://developers.eos.io/welcome/v2.2/introduction-to-eosio/index
YesPermissioned onboarding is possible via EOS through a two-layer security solution known as “Private Access Control.”

https://developers.eos.io/manuals/eos/v2.2/nodeos/features/private_chain_access/index
YesYes, EOS block explorer is available at:
https://eosflare.io/
NoNoSpecific stablecoin architecture is being developed on EOS through EOS Stablecoin Chain, which may have freeze and seize capabilities. However, this technology has not been deployed to mainnet.

https://www.escc.io/
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EthereumYesEthereum is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://ethereum.org/en/what-is-ethereum/
YesPermissioned onboarding can be facilitated through the whitelisting of public addresses via smart contract. An example of this is in the original EUR CoinVertible stablecoin deployed by Societe Generale on Ethereum:

https://etherscan.io/address/0xf7790914dc335b20aa19d7c9c9171e14e278a134#code
YesYes, Ethereum block explorer is available at:
https://etherscan.io/
YesYesThe USDP and PYUSD stablecoins on Ethereum have freeze and seize capabilities.

https://github.com/paxosglobal/usdp-contractshttps://github.com/paxosglobal/pyusd-contract
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Hedera HashgraphYesHedera Hashgraph is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://hedera.com/

https://hedera.com/open-source
YesThe Hedera Token Service allows token issuers to enforce compliance measures such as KYC/AML checks, token freezing, and role-based permissions.

https://hedera.com/token-service
YesYes, Hedera block explorer is available at:
https://hashscan.io/mainnet/dashboard
YesYesHedera’s Asset Tokenization Studio supports account-level controls, which includes freeze (”Lock”) and seize (”Access Control”) features.

https://docs.hedera.com/hedera/open-source-solutions/asset-tokenization-studio-ats
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ImmutableYesImmutable is a public and permissionless layer-2 blockchain built on Ethereum, that allows users to create transactions and deploy code on the network.

https://uploads-ssl.webflow.com/646557ee455c3e16e4a9bcb3/6499367de527dd82ab7475a3_Immutable%20Whitepaper%20Update%202023%20(3).pdf
YesWhile Immutable does not natively support customizable validators or subnets for controlling user onboarding, developers can implement permissioning mechanisms through smart contracts  and  whitelisting  within their applications built on top of the platform.

https://docs.immutable.com/x/immutable-layer-2#layer-2s-on-immutable

https://docs.immutable.com/x/what-is-immutablex#:~:text=Ethereum%2Dlevel%20security,users%20and%20applications.
YesYes, Immutable block explorer is available at:
https://explorer.immutable.com/
NoNoAlthough ImmutableX is a layer-2 network on top of Ethereum, it is predominantly built in StarkEx (Cairo programming language), and therefore USDP / PYUSD stablecoin examples with freeze and seize may not be applicable.

https://www.immutable.com/blog/immutablex-scaling-web3-games-with-starkware
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LightningYesLightning is a public and permissionless layer-2 blockchain built on Bitcoin, that allows users to create transactions via payment channels.

https://lightning.network/
NoAs a layer-2 solution for Bitcoin, Lightning relies on Bitcoin's underlying network for security and does not have its own validator set.NoWhile the Bitcoin blockchain provides transparency regarding the total supply of BTC, the Lightning Network conducts transactions off-chain within payment channels. This design enhances privacy but limits the ability to verify the number of tokens circulating within the network's channels at any given moment. The aggregate capacity of the network is known, but detailed, real-time reconciliation to reserves is not readily available.

https://github.com/lnbook/lnbook/blob/develop/03_how_ln_works.asciidoc
NoNoLightning is a layer-2 network on top of Bitcoin and therefore does not have native capabilities to freeze or seize tokens.
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LiquidYesLiquid allows any user to run a node, broadcast and forward peer-to-peer transactions, and build applications.

"Functionaries" (like bitcoin miners) are responsible for the network consensus process, but do not limit which users can participate. All users on Liquid have exactly the same permissions & privileges.

Liquid users can transact and Peg in assets like L-BTC or issue tokenized assets without depending on centralized intermediaries.

https://help.blockstream.com/hc/en-us/articles/900003264706-What-is-a-Liquid-Network-functionary
YesPermissioned onboarding is achieved with Blockstream's Asset Management Platform (AMP). AMP enables a user to generate a pseudonymous id associated with their wallet, which can then be used by an issuer to assert a whitelist or blacklist for their specific asset. Whitelists and blacklists are a function of the AMP policy defined by the issuer and does not interfere with the wallet's ability to transact beyond the issuer's asset.

https://docs.liquid.net/docs/blockstream-amp-overview
YesYes, Liquid block explorer is available at:
https://blockstream.info/liquid
NoYesThe Liquid Network enables asset issuance using the AMP APIs, which provide advanced asset management capabilities such as freeze and seize properties. These features allow issuers to embed rules into their assets, granting the ability to temporarily restrict (freeze) or reclaim (seize) tokens under predefined conditions, such as for regulatory compliance or risk mitigation. Freeze functionality restricts the movement of specific assets, while seize functionality allows the reallocation of tokens from one address to another.
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MoneroYesMonero is a privacy-focused, public and permissionless layer-1 blockchain that allows users to create transactions and run nodes, but not deploy code on the network.

https://www.getmonero.org/get-started/what-is-monero/
NoMonero uses proof-of-work, similar to zCash and Bitcoin, and therefore does not have customizable validator sets.NoMonero maintains a programmatic emissions schedule:
https://www.getmonero.org/get-started/faq/#max-supply

However, due to Monero's privacy features (i.e., Ring Confidential Transactions), the obfuscation of individual transaction amounts make straightforward verification of the total supply challenging in real-time.
NoNoMonero is designed for privacy and decentralization and does not support freezing or seizing tokens.

https://github.com/monero-project/monero
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NEARYesNEAR is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://near.org/papers/the-official-near-white-paper/ 
YesPermissioned onboarding could be facilitated via Function Call Keys that provide restricted access to third parties.

https://docs.near.org/concepts/protocol/access-keys
YesYes, NEAR block explorer is available at:
https://explorer.near.org/
NoNoNEAR does not natively support freeze and seize. Though it does have smart contract capabilities, no existing examples were found at this time.

https://docs.near.org/build/smart-contracts/what-is
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OptimismYesOptimism is a public and permissionless layer-2 blockchain built on Ethereum, that allows users to create transactions and deploy code on the network.

https://docs.optimism.io/stack/getting-started 

https://gov.optimism.io/t/upgrade-proposal-10-granite-network-upgrade/8733
YesOptimism is built on the OP Stack, and therefore does not have customizable validator nodes. However, permissioned onboarding can be facilitated through the whitelisting of public addresses via smart contract. An example of this is in the original EUR CoinVertible stablecoin deployed by Societe Generale on Ethereum, which uses the same Solidity programming language as the OP Stack for smart contracts:

https://etherscan.io/address/0xf7790914dc335b20aa19d7c9c9171e14e278a134#code
YesYes, Optimism block explorer is available at:
https://optimistic.etherscan.io/
YesYesOptimism is a layer-2 network on top of Ethereum (via the OP Stack), and therefore uses the Solidity programming language for smart contracts. The freeze and seize functionality featured in USDP and PYUSD stablecoins on Ethereum are applicable by extension.

https://github.com/paxosglobal/usdp-contracts

https://github.com/paxosglobal/pyusd-contract

https://docs.optimism.io/stack/smart-contracts
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PolkadotYesPolkadot is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://polkadot.com/

https://wiki.polkadot.network/docs/polkadot-v1
YesPolkadot has several methods to achieve permissioned onboarding, including creating private networks via Substrate, custom parachains, or collator node configuration.

https://substrate.io/vision/substrate-and-polkadot/

https://polkadot.com/parachains

https://wiki.polkadot.network/docs/learn-collator

YesYes, Polkadot block explorer is available at:
https://polkadot.subscan.io/
NoNoPolkadot does not have an inherent ability to freeze or seize tokens at the protocol level.

However, it does have parachains like Moonbeam that are EVM compatible, and therefore the USDP / PYUSD example on Solidity could be applicable on a related network.

https://wiki.polkadot.network/docs/faq#parachains

https://docs.moonbeam.network/learn/features/eth-compatibility/
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PolygonYesPolygon (formerly Matic) is a public and permissionless layer-2 blockchain built on Ethereum, that allows users to create transactions and deploy code on the network.

https://polygon.technology/

https://polygon.technology/blog/polygon-zkevm-mainnet-beta-is-live
YesUsing the Polygon Chain Development Kit (CDK), developers can create custom layer 2 chains with their own infrastructure, including nodes and validators. This allows for significant customization in how these layer 2 solutions are set up and managed.

https://polygon.technology/polygon-cdk#
YesYes, Polygon block explorer is available at:
https://polygonscan.com/
YesYesPolygon is a layer-2 network on top of Ethereum, and therefore uses the Solidity programming language for smart contracts. The freeze and seize functionality featured in USDP and PYUSD stablecoins on Ethereum are applicable by extension.

https://github.com/paxosglobal/usdp-contracts

https://github.com/paxosglobal/pyusd-contracthttps://docs.polygon.technology/pos/
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Ripple (XRP Ledger)YesXRP Ledger is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://xrpl.org/about/faq

https://xrpl-hooks.readme.io/docs/introduction
YesThe XRP Ledger uses a system called the Unique Node List (UNL), which is a list of trusted validators that each participant can choose to follow. Validators on the XRP Ledger propose transactions, and only those validators that are part of a participant's UNL are trusted to contribute to consensus.

https://xrpl.org/about/faq
YesYes, Ripple block explorer is available at:
https://livenet.xrpl.org/
YesNoThe XRP Ledger does have a freeze feature, although it is not clear if there is a commensurate seize function. The XRP token itself is treated differently and cannot be frozen.

https://xrpl.org/docs/concepts/tokens/fungible-tokens/freezes

https://xrpl.org/docs/concepts/tokens/fungible-tokens/common-misconceptions-about-freezes
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SolanaYesSolana is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://solana.com/

https://solana.com/solana-whitepaper.pdf 
YesSolana uses a proof-of-history mechanism combined with proof-of-stake where validators are determined by stake and protocol rules without arbitrary customization but does have permissioned environments https://solana.com/developers/guides/permissioned-environmentsYesYes, Solana block explorer is available at:
https://explorer.solana.com/
YesYesSolana has native token extensions which include “Permanent Delegation,” which can facilitate regulatory compliance with freeze and seize orders.

https://solana.com/news/token-extensions-on-solana

The USDP and PYUSD stablecoins on Solana have freeze and seize capabilities.

https://github.com/paxosglobal/usdp-contractshttps://github.com/paxosglobal/pyusd-contract
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StacksYesStacks is a public and permissionless layer-2 on top of Bitcoin that allows users to create transactions and deploy code on the network.

https://www.stacks.co/what-is-stacks
NoBuilt on Bitcoin, Stacks does not have its own independent validator set; it relies on Bitcoin's security for its operations.YesYes, Stacks block explorer is available at:
https://explorer.hiro.so/
NoNoStacks operates as a layer-2 network on Bitcoin and does not inherently support token freezing or seizure, as it focuses on decentralized applications and smart contracts without such control mechanisms.
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StellarYesStellar is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://www.stellar.org/learn/intro-to-stellar 
YesYes, Stellar can support permissioned onboarding through customizable validator sets using its Stellar Consensus Protocol (SCP). Here's how this works:

https://developers.stellar.org/docs/validators
YesYes, Stellar block explorer is available at:
https://stellar.expert/explorer/public
YesYesStellar supports a global freeze and seize functions as “Clawbacks.”

https://developers.stellar.org/docs/tokens/control-asset-access
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SuiYesSui is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://sui.io/

https://docs.sui.io/paper/sui.pdf
NoSui could accomplish customizable validator sets through their Delegated Proof-of-Stake consensus mechanism which provides a mechanisms for controlling user onboarding, and has the ability to implement  whitelisting  via smart contracts.

https://docs.sui.io/guides/operator/validator-committee

https://docs.sui.io/standards/deepbookv3-sdk/pools#whitelisted

https://docs.sui.io/guides/developer/cryptography/zklogin-integration#user-salt-management
YesYes, Sui block explorer is available at:
https://suiscan.xyz/mainnet/home
YesYesRegulated coins on Sui freeze the metadata they create automatically by using the “transfer::public_freeze_object” function.

https://docs.sui.io/standards/coin
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TezosYesTezos is a public and permissionless layer-1 blockchain that allows users to create transactions and deploy code on the network.

https://tezos.com/learn/what-is-tezos/ 
YesPrivate Rollups: Smart Rollups on Tezos are permissionless by default, but developers can create custom rollups that implement permissioning mechanisms, such as whitelisting validators or nodes

https://tezos.gitlab.io/active/smart_rollups.html#private-rollups-paris
YesYes, Tezos block explorer is available at:
https://tzstats.com/
YesYesToken standards like the Tezos FA1.2 (similar to ERC-20) or FA2 (multi-asset standard) allow for custom features, including the ability to freeze or seize tokens. This is usually done through permissions granted to certain administrative roles, e.g. USDtez.

https://docs.tezos.com/architecture/tokens

https://usdtz.com/
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zCashYeszCash is a privacy-focused, public and permissionless layer-1 blockchain that allows users to create transactions and run nodes, but not deploy code on the network.

https://z.cash/learn/
No zCash uses proof-of-work like Bitcoin, which does not involve customizable validators; miners validate transactions based on computational work.NoZcash has a fixed total supply similar to Bitcoin (21 million ZEC):
https://z.cash/learn/what-are-the-economics-of-zcash/

However, the use of shielded transactions obscures the ability to verify the exact number of tokens in circulation at any given time which makes real-time reconciliation to reserves challenging.
YesNoZcash is a privacy-focused blockchain without built-in features for freezing or seizing tokens.

https://zips.z.cash/protocol/protocol.pdf
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