diff --git a/docs/deposits/index.adoc b/docs/deposits/index.adoc index 8c4b7b304..d807ee236 100644 --- a/docs/deposits/index.adoc +++ b/docs/deposits/index.adoc @@ -152,6 +152,8 @@ proofs. include::./mispayment.adoc[leveloffset=+2] +include::./minting.adoc[leveloffset=+2] + == Lots :lot-size: 1.0 diff --git a/docs/deposits/minting.adoc b/docs/deposits/minting.adoc new file mode 100644 index 000000000..dc1f6b446 --- /dev/null +++ b/docs/deposits/minting.adoc @@ -0,0 +1,70 @@ += Minting + +:signer-fee-withheld: 0.005 TBTC +:additional-depositor-redemption-rebate: 0.001 TBTC + +Once a deposit has been requested and a signing group formed, a depositor may +submit proof of their funding transaction. This initial proof has no work +accumulation requirement -- a single confirmation on the Bitcoin network will +suffice. + +Minting and distributing a liquid, fungible token from a single confirmation, +however, would open up the peg to short reorg attacks. For this reason, the +fungible token's minting is delayed. Instead, the depositor is granted a +non-fungible token that's unique to the deposit. + +== Non-fungible deposit token + +The non-fungible deposit token grants the exclusive right to redeem its matching +deposit. The owner of the transferrable token can request redemption, and after +paying any outstanding fees, be guaranteed the UTXO backing the deposit, or +recompense from the signing group's bonded collateral. + +// TODO link to the redemption process + +Before a particular Bitcoin deposit accumulates confirmations, a depositor is +free to transfer their NFT, trading it or perhaps using it as collateral +elsewhere. Anyone receiving a deposit NFT should verify they are comfortable +with the state of the matching deposit. + +// TODO can a deposit be challenged if its proof is re-orged? + +== Fungible TBTC and the nonfungible deposit beneficiary token + +// TODO be specific with the deposit timeout + +If a proof showing enough accumulated work is submitted before a timeout, the +deposit NFT becomes eligible for minting fungible TBTC. Minting TBTC is optional +-- depositors can stick with their NFTs, which will be valid for the lifetime of +a maintained deposit. + +// TODO NB if a deposit is liquidated, the NFT can stick around and be backed by +// the liquid token + +The holder of a qualified deposit NFT may exchange that NFT for 1 newly minted +TBTC, less a requisite {signer-fee-withheld} signing fee. + +If the deposit NFT holder would like to maintain the exclusive right to redeem +the deposit, ensuring they maintain future access to the backing UTXO, they can +pay the signing fees immediately. Their right will be exclusive for the term of +the deposit, excepting any liquidation event due to fraud or price movements. + +If the deposit NFT holder instead opts to waive their right to exclusive +redemption, they receive 1 TBTC less the requisite {signer-fee-withheld} due to +signers, and take on the role of "deposit beneficiary". The deposit beneficiary +role is designated by a different non-fungible token, granting the right to a +fee rebate when a particulate deposit is redeemed, plus an additional reward of +{additional-depositor-redemption-rebate}, paid by the redeemer of the deposit. + +This mechanism rewards depositors who cede their exclusive right to redeem a +particular deposit (and thus backing UTXO) by moving the cost of the system to +eventual redeemers. + +// TODO update the signer fee section + +== Burning TBTC to lock an unlocked deposit + +At any time, an anyone-redeemable deposit can be locked by paying the +outstanding TBTC represented by the depoist, plus the requisite +{signer-fee-withheld} to signers and the additional depositor redemption rebate +of {additional-deposit-redemption-rebate}.