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RGB-20: Fungible assets schema family
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| ``` | ||
| LNPBP: 0020 | ||
| Layer: Application (5) | ||
| Vertical: Smart contracts | ||
| Title: RGB fungible assets schema (RGB-20) | ||
| Authors: Dr Maxim Orlovsky <[email protected]>, | ||
| Giacomo Zucco, | ||
| Marco Amadori, | ||
| Nicola Busanello | ||
| Federico Tenga, | ||
| Sabina Sachtachtinskagia, | ||
| Martino Salvetti | ||
| Comments-URI: <https://github.com/LNP-BP/LNPBPs/issues/70> | ||
| Status: Final | ||
| Type: Standards Track | ||
| Created: 2019-09-23 | ||
| Finalized: 2020-10-10 | ||
| License: CC0-1.0 | ||
| ``` | ||
|
|
||
| ```rust | ||
| Schema { | ||
| rgb_features: features::FlagVec::new(), | ||
| root_id: Default::default(), | ||
| field_types: type_map! { | ||
| // Rational: if we will use just 26 letters of English alphabet (and | ||
| // we are not limited by them), we will have 26^8 possible tickers, | ||
| // i.e. > 208 trillions, which is sufficient amount | ||
| FieldType::Ticker => DataFormat::String(8), | ||
| FieldType::Name => DataFormat::String(256), | ||
| // Contract text may contain URL, text or text representation of | ||
| // Ricardian contract, up to 64kb. If the contract doesn't fit, a | ||
| // double SHA256 hash and URL should be used instead, pointing to | ||
| // the full contract text, where hash must be represented by a | ||
| // hexadecimal string, optionally followed by `\n` and text URL | ||
| FieldType::ContractText => DataFormat::String(core::u16::MAX), | ||
| FieldType::Precision => DataFormat::Unsigned(Bits::Bit8, 0, 18u128), | ||
| // We need this b/c allocated amounts are hidden behind Pedersen | ||
| // commitments | ||
| FieldType::IssuedSupply => DataFormat::Unsigned(Bits::Bit64, 0, core::u64::MAX as u128), | ||
| // Supply in either burn or burn-and-replace procedure | ||
| FieldType::BurnedSupply => DataFormat::Unsigned(Bits::Bit64, 0, core::u64::MAX as u128), | ||
| // While UNIX timestamps allow negative numbers; in context of RGB | ||
| // Schema, assets can't be issued in the past before RGB or Bitcoin | ||
| // even existed; so we prohibit all the dates before RGB release | ||
| // This timestamp is equal to 10/10/2020 @ 2:37pm (UTC) | ||
| FieldType::Timestamp => DataFormat::Integer(Bits::Bit64, 1602340666, core::i64::MAX as i128), | ||
| FieldType::HistoryProof => DataFormat::Bytes(core::u16::MAX), | ||
| FieldType::HistoryProofFormat => DataFormat::Enum(HistoryProofFormat::all()), | ||
| FieldType::BurnUtxo => DataFormat::TxOutPoint | ||
| }, | ||
| owned_right_types: type_map! { | ||
| OwnedRightsType::Inflation => StateSchema { | ||
| // How much issuer can issue tokens on this path. If there is no | ||
| // limit, than `core::u64::MAX` / sum(inflation_assignments) | ||
| // must be used, as this will be a de-facto limit to the | ||
| // issuance | ||
| format: StateFormat::CustomData(DataFormat::Unsigned(Bits::Bit64, 0, core::u64::MAX as u128)), | ||
| // Validation involves other state data, so it is performed | ||
| // at the level of `issue` state transition | ||
| abi: bmap! {} | ||
| }, | ||
| OwnedRightsType::Assets => StateSchema { | ||
| format: StateFormat::DiscreteFiniteField(DiscreteFiniteFieldFormat::Unsigned64bit), | ||
| abi: bmap! { | ||
| // sum(inputs) == sum(outputs) | ||
| AssignmentAction::Validate => Procedure::Embedded(StandardProcedure::NoInflationBySum) | ||
| } | ||
| }, | ||
| OwnedRightsType::Epoch => StateSchema { | ||
| format: StateFormat::Declarative, | ||
| abi: bmap! {} | ||
| }, | ||
| OwnedRightsType::BurnReplace => StateSchema { | ||
| format: StateFormat::Declarative, | ||
| abi: bmap! {} | ||
| }, | ||
| OwnedRightsType::Renomination => StateSchema { | ||
| format: StateFormat::Declarative, | ||
| abi: bmap! {} | ||
| } | ||
| }, | ||
| public_right_types: bset![], | ||
| genesis: GenesisSchema { | ||
| metadata: type_map! { | ||
| FieldType::Ticker => Once, | ||
| FieldType::Name => Once, | ||
| FieldType::ContractText => NoneOrOnce, | ||
| FieldType::Precision => Once, | ||
| FieldType::Timestamp => Once, | ||
| FieldType::IssuedSupply => Once | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::Inflation => NoneOrUpTo(None), | ||
| OwnedRightsType::Epoch => NoneOrOnce, | ||
| OwnedRightsType::Assets => NoneOrUpTo(None), | ||
| OwnedRightsType::Renomination => NoneOrOnce | ||
| }, | ||
| public_rights: bset![], | ||
| abi: bmap! {}, | ||
| }, | ||
| extensions: bmap![], | ||
| transitions: type_map! { | ||
| TransitionType::Issue => TransitionSchema { | ||
| metadata: type_map! { | ||
| FieldType::IssuedSupply => Once | ||
| }, | ||
| closes: type_map! { | ||
| OwnedRightsType::Inflation => Once | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::Inflation => NoneOrUpTo(None), | ||
| OwnedRightsType::Epoch => NoneOrOnce, | ||
| OwnedRightsType::Assets => NoneOrUpTo(None) | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! { | ||
| // sum(in(inflation)) >= sum(out(inflation), out(assets)) | ||
| TransitionAction::Validate => Procedure::Embedded(StandardProcedure::FungibleInflation) | ||
| } | ||
| }, | ||
| TransitionType::Transfer => TransitionSchema { | ||
| metadata: type_map! {}, | ||
| closes: type_map! { | ||
| OwnedRightsType::Assets => OnceOrUpTo(None) | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::Assets => NoneOrUpTo(None) | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! {} | ||
| }, | ||
| TransitionType::Epoch => TransitionSchema { | ||
| metadata: type_map! {}, | ||
| closes: type_map! { | ||
| OwnedRightsType::Epoch => Once | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::Epoch => NoneOrOnce, | ||
| OwnedRightsType::BurnReplace => NoneOrOnce | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! {} | ||
| }, | ||
| TransitionType::Burn => TransitionSchema { | ||
| metadata: type_map! { | ||
| FieldType::BurnedSupply => Once, | ||
| // Normally issuer should aggregate burned assets into a | ||
| // single UTXO; however if burn happens as a result of | ||
| // mistake this will be impossible, so we allow to have | ||
| // multiple burned UTXOs as a part of a single operation | ||
| FieldType::BurnUtxo => OnceOrUpTo(None), | ||
| FieldType::HistoryProofFormat => Once, | ||
| FieldType::HistoryProof => NoneOrUpTo(None) | ||
| }, | ||
| closes: type_map! { | ||
| OwnedRightsType::BurnReplace => Once | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::BurnReplace => NoneOrOnce | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! { | ||
| TransitionAction::Validate => Procedure::Embedded(StandardProcedure::ProofOfBurn) | ||
| } | ||
| }, | ||
| TransitionType::BurnAndReplace => TransitionSchema { | ||
| metadata: type_map! { | ||
| FieldType::BurnedSupply => Once, | ||
| // Normally issuer should aggregate burned assets into a | ||
| // single UTXO; however if burn happens as a result of | ||
| // mistake this will be impossible, so we allow to have | ||
| // multiple burned UTXOs as a part of a single operation | ||
| FieldType::BurnUtxo => OnceOrUpTo(None), | ||
| FieldType::HistoryProofFormat => Once, | ||
| FieldType::HistoryProof => NoneOrUpTo(None) | ||
| }, | ||
| closes: type_map! { | ||
| OwnedRightsType::BurnReplace => Once | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::BurnReplace => NoneOrOnce, | ||
| OwnedRightsType::Assets => OnceOrUpTo(None) | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! { | ||
| TransitionAction::Validate => Procedure::Embedded(StandardProcedure::ProofOfBurn) | ||
| } | ||
| }, | ||
| TransitionType::Renomination => TransitionSchema { | ||
| metadata: type_map! { | ||
| FieldType::Ticker => NoneOrOnce, | ||
| FieldType::Name => NoneOrOnce, | ||
| FieldType::ContractText => NoneOrOnce, | ||
| FieldType::Precision => NoneOrOnce | ||
| }, | ||
| closes: type_map! { | ||
| OwnedRightsType::Renomination => Once | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::Renomination => NoneOrOnce | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! {} | ||
| }, | ||
| // Allows split of rights if they were occasionally allocated to the | ||
| // same UTXO, for instance both assets and issuance right. Without | ||
| // this type of transition either assets or inflation rights will be | ||
| // lost. | ||
| TransitionType::RightsSplit => TransitionSchema { | ||
| metadata: type_map! {}, | ||
| closes: type_map! { | ||
| OwnedRightsType::Inflation => NoneOrUpTo(None), | ||
| OwnedRightsType::Assets => NoneOrUpTo(None), | ||
| OwnedRightsType::Epoch => NoneOrOnce, | ||
| OwnedRightsType::BurnReplace => NoneOrOnce, | ||
| OwnedRightsType::Renomination => NoneOrOnce | ||
| }, | ||
| owned_rights: type_map! { | ||
| OwnedRightsType::Inflation => NoneOrUpTo(None), | ||
| OwnedRightsType::Assets => NoneOrUpTo(None), | ||
| OwnedRightsType::Epoch => NoneOrOnce, | ||
| OwnedRightsType::BurnReplace => NoneOrOnce, | ||
| OwnedRightsType::Renomination => NoneOrOnce | ||
| }, | ||
| public_rights: bset! [], | ||
| abi: bmap! { | ||
| // We must allocate exactly one or none rights per each | ||
| // right used as input (i.e. closed seal); plus we need to | ||
| // control that sum of inputs is equal to the sum of outputs | ||
| // for each of state types having assigned confidential | ||
| // amounts | ||
| TransitionAction::Validate => Procedure::Embedded(StandardProcedure::RightsSplit) | ||
| } | ||
| } | ||
| }, | ||
| } | ||
| ``` | ||
|
|
||
| ## Subschemata | ||
|
|
||
| - https://github.com/LNP-BP/LNPBPs/issues/44 | ||
|
|
||
| ## Rationale | ||
|
|
||
| Include from | ||
| - https://github.com/LNP-BP/LNPBPs/issues/27 | ||
| - https://github.com/LNP-BP/LNPBPs/issues/28 | ||
| - https://github.com/LNP-BP/LNPBPs/issues/50 |