WBTC is a well-known project.
https://wbtc.network/It contains almost 153,000
BTC. More than 70% of all tokenized
BTC are represented by the tokens of this project
https://btconethereum.com/The project works as a custodian service.
We pass KYC, send our
BTC, get ETH WBTC tokens.
There is also a reverse exchange.
Customers' bitcoins are stored in a centralized storage, so you need to trust the custodian.
Alternative decentralized projectsRenBTChttps://renproject.io19200
BTC is locked in RenBTC. The project ranks 2nd in terms of the number of tokenized
BTC.
https://btconethereum.com/"RenBTC - ERC-20 type token developed by Ren project (former Republic Protocol). renBTC stands on the basement of RenVM - network which enables interoperability between chains. RenVM allows to lock assets on the one chain and issue 1:1 backed assets on another, and wise-versa. It also stated that RenVM is quite secure and is difficult to attack.
RenVM philosophy is based on enabling decentralized custody and it uses the RZL MPC algorithm, which can generate and manage ECDSA private keys without ever exposing them. Darknodes — entities within the ecosystem with 100k+ tokens staked are randomly divided into shards and the shard will generate the secret ECDSA private key.
RenVM uses a different approach there: they implemented algorithmically adjusted fees. How does it work? Each issuing/redeeming of renBTC follows with the fee collected from the user. Fees are dynamically adjusted by the algorithm in response to the demand in that way that the total value of REN bonded by Darknodes should be always greater than the total value of assets locked in RenVM. This model secures Darknodes’ collateral from being liquidated. In addition to this, the bond value is 3x times greater than the maximum locked value (300% of collateralization).
renBTC are created in a process called “lock-and-mint transactions”. They initiated by user who sends the amount of BTC, desired to be exchanged to renBTC, to the renVM. When the custody gets the tokens, it issues the renBTC to the user."
https://medium.com/@manmann/renbtc-vs-tbtc-ed3ef832d0db![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.ibb.co%2FpQJK2hK%2Fimage.jpg&t=665&c=yuRXx2NkllP4Og)
1. The user pays
BTC to the generated address.
2. The Ren network consists of darknodes that store our
BTC and generate RenBTC
To issue RenBTC, a darknode must have Ren tokens on its balance.
The level of collateral is 300%, i.e. each 1
BTC is backed by a collateral of 3
BTC in REN tokens.
The level is quite high, but this limits the issuance of RenBTC tokens.
tBTChttps://keep.network1387
BTC is locked in tBTC. The project ranks 5th in terms of the number of tokenized
BTC.
"We will start with the TBTC is the project developed by Keep Project, Summa, and the Cross-Chain Group. TBTC utilizing the Random Beacon technology developed by Keep, which provides the true randomization of Signers and contributes to the trust-less-ness of the system. Summa provided custom-built interoperability solutions for crypto-companies. The same as RenVM, the TBTC project allows to lock coins on the Bitcoin chain and to issue them on the Ethereum chain.
TBTC follows similar fundamental principles, the project is using decentralized custody as well and using EDCSA signature for managing private keys of the Signers, so no single Signer has access to the funds of the users he secures. TBTC has similar principles as RenVM on the custody side: all the nodes staking 100K+ KEEP tokens could perform as a Signers - entities keeping the deposited BTCs until the depositor claims them back.
Signers in a TBTC project using ETH as collateral and the collateralization ratio is 150%, meaning that for every 1 users’ BTC the Signer keeps he should have 1.5 BTC in the ETH equivalent locked.
If the group of Signers somehow run off with the Bitcoins deposited to their wallet, their ETH bonds will be seized by the system and liquidated, so the end-user will not lose even a penny of his funds.
It is expected, that the project will decrease the collateralization ratio to 135% soon after the launch. The team is also examining new ways to decrease that ratio down to 40%."
https://medium.com/@manmann/renbtc-vs-tbtc-ed3ef832d0db![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.ibb.co%2FMCnRVnx%2Fimage.jpg&t=665&c=NmtSSm9g9xd2Lg)
1.User sends a request to receive tBTC
2. The network randomly selects 3 signers who create a private key. (individually, each of them does not have access to it)
3. The user pays
BTC to the generated address and receives tBTC.
ComparisontBTC uses ETH as collateral. But tBTC has a lower liquidation rate.
These 2 projects are completely decentralized, although the projects accuse each other of violations of decentralization
Sources:https://medium.com/@manmann/renbtc-vs-tbtc-ed3ef832d0dbhttps://evandrosaturnino.medium.com/as-maiores-diferenças-entre-renbtc-e-tbtc-b0197f600fb4
https://medium.com/@manmann/cpaвнeниe-tbtc-c-renbtc-5e1d84d044ddhttps://blog.keep.network/the-importance-of-randomness-keeps-role-in-tbtc-a20e444d285bRU:
https://bitcointalk.org/index.php?topic=5288444