GreatVoyage-v4.0.0¶
Release 4.0.0 has implemented the shielded TRC-20 contract, which can hide the source address, destination address, and the token amount for TRC-20 transactions and provide users with better privacy. The shielded TRC-20 contract has three core functions: mint
, transfer
and burn
. mint
is used to transform the public TRC-20 token to shielded token; transfer
is used for shielded token transactions; burn
is used to transform the shielded token back to the public TRC-20 token. To support the shielded TRC-20 contract, four new zero-knowledge instructions (verifyMintProof
, verifyTransferProof
, verifyBurnProof
and pedersenHash
) are add in TVM, which make it convenient to provide privacy for arbitrary TRC-20 contract.
Notices¶
Forced upgrade
New features¶
- Add 4 new instructions (
verifyMintProof
,verifyTransferProof
,verifyBurnProof
andpedersenHash
) in TVM to support TRC20 shielded transactions based on zk-SNARKs (#3172). verifyMintProof
: used to validate the zero-knowledge proof formint
function.verifyTransferProof
: used to validate the zero-knowledge proof fortransfer
function.verifyBurnProof
: used to validate the zero-knowledge proof forburn
function.pedersenHash
: used to compute the Pedersen hash.- Update the initial parameters of zk-SNARKs scheme generated by the MPC Torch (#3210).
- Add the APIs to support shielded TRC-20 contract transaction (#3172).
1. Create shielded contract parameters
rpc CreateShieldedContractParameters (PrivateShieldedTRC20Parameters) returns (ShieldedTRC20Parameters) {}
rpc CreateShieldedContractParametersWithoutAsk (PrivateShieldedTRC20ParametersWithoutAsk) returns (ShieldedTRC20Parameters) {}
rpc ScanShieldedTRC20NotesByIvk (IvkDecryptTRC20Parameters) returns (DecryptNotesTRC20) {}
rpc ScanShieldedTRC20NotesByOvk (OvkDecryptTRC20Parameters) returns (DecryptNotesTRC20) {}
rpc IsShieldedTRC20ContractNoteSpent (NfTRC20Parameters) returns (NullifierResult) {}
rpc GetTriggerInputForShieldedTRC20Contract (ShieldedTRC20TriggerContractParameters) returns (BytesMessage) {}
ovk
to scan the transparent output of burn
transaction (#3203).
- Support the burn
transaction with zero or one shielded output (#3224).
- Add data field in transaction log trigger class for future memo note (#3200).
The following TIPs are implemented in this release: - TIP-135: Shielded TRC-20 contract standards, guarantee the privacy of the shielded transfer of TRC-20 tokens. - TIP-137: Implements three zero-knowledge proof instructions in TVM to support the shielded TRC-20 contract (#3172). - TIP-138: Implements the Pedersen hash computation instruction in TVM to support the shielded TRC-20 contract (#3172).
Changes¶
- Check if null before getInstance when get transaction info from DB to fix exception of
getTransactioninfoByBlkNum
(#3165).