Stablecoin Chaincode Package
Oracle Blockchain Platform Digital Assets Edition includes sample chaincode for a stablecoin life cycle scenario.
The stablecoin chaincode supports the full life cycle of a stablecoin, represented by a fungible token based on the extended Token Taxonomy Framework standard. You can use chaincode methods to mint, transfer, hold, and burn tokens with role-based approvals.
The stablecoin chaincode package is downloadable from the Oracle Blockchain
Platform console, and includes the following components.
Stablecoin.zip, an archive file that contains the packaged chaincode for deployment.Stablecoin.yaml, a specification file that you can use with Blockchain App Builder to scaffold theStablecoinchaincode.Stablecoin_postman_collection.json, a Postman collection that enables you to test the APIs in the chaincode.README.md, a step-by-step guide for working with the chaincode.
To get the stablecoin chaincode package, in the Oracle Blockchain Platform Digital Assets console click the Digital Assets tab and then select Stablecoin Application.
Specification File
The stablecoin specification file (Stablecoin.yml) is based on the extended Token Taxonomy Framework specification file. In addition to the stablecoin asset, the specification file defines the AccountPolicyCheck, ApprovalPolicyCheck, and ApprovalTransactions the TransferRestriction assets.#
# Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
#
assets:
# Token asset to manage the complete lifecycle of stablecoin
- name: stablecoin # Asset name
type: token # Asset type
standard: ttf+ # Token standard
anatomy:
type: fungible # Token type
unit: fractional # Token unit
behavior: # Token behaviors
- divisible:
decimal: 2
- mintable:
mint_approval_required: true
- transferable
- burnable:
burn_approval_required: true
- holdable
- roles:
minter_role_name: minter
burner_role_name: burner
notary_role_name: notary
mint_approver_role_name: notary
burn_approver_role_name: notary
properties: # Custom asset attributes for stablecoin
- name: currencyName # The currency name that the stablecoin is pegged with
type: string
mandatory: true
- name: conversionRate # The currency to stablecoin conversion rate
type: float
mandatory: true
# AccountPolicyCheck — Defines policies for an account to decide whether an account is eligible to transact
- name: AccountPolicyCheck # Asset name
properties: # Asset attributes
- name: accountPolicyId #Unique derived ID for the account policy, ensuring one policy per account.
type: string
mandatory: true
id: true
derived:
strategy: concat
format: ["APID~%1~%2","orgId","userId"]
- name: orgId # Organization owning the account.
type: string
mandatory: true
validate: required()
- name: userId # Account holder identifier linked to this policy.
type: string
mandatory: true
validate: required()
- name: kycCompliance # Indicates whether KYC verification is complete. Required for transaction eligibility. If true, the account can transfer stablecoins.
type: string
validate: /^\s*(true|false)\s*$/
mandatory: true
- name: amlCompliance # Indicates AML screening status. Prevents suspicious accounts from transacting. If true, the account can transfer stablecoins.
type: string
validate: /^\s*(true|false)\s*$/
mandatory: true
- name: riskScore # Quantitative risk indicator.
type: float
validate: min(0)
- name: restrictionFlag #Transaction blocking flag. If true, hold operations are limited to the lowest bucket range defined in the approval policy, and any amount above that range is rejected;
#for transfer operations, the account can transfer only within the bucket limits specified in the TransferRestriction asset.
type: string
validate: /^\s*(true|false)\s*$/
mandatory: true
methods:
crud: [create, update, getById, delete]
others: [getHistoryById, getByRange]
# ApprovalPolicyCheck — Maps transaction amount slabs to approval rules
- name: ApprovalPolicyCheck # Asset name
properties: # Asset attributes
- name: approvalPolicyId # Unique derived identifier for each approval slab based on amount range.
type: string
mandatory: true
id: true
derived:
strategy: concat
format: ["GPID~%1~%2","transactionLowerLimit","transactionUpperLimit"]
- name: transactionLowerLimit # Minimum transaction amount where this rule applies.
type: float
validate: min(0)
mandatory: true
- name: transactionUpperLimit # Maximum transaction amount covered by this rule.
type: float
validate: min(0)
mandatory: true
- name: numberOfApprovalsRequired # Total approvals needed for transactions in this range.
type: number
mandatory: true
validate: min(0)
- name: approverDetails # List of authorized approvers and their sequence for this slab.
type: approverDetails[]
methods:
crud: [create, update, getById, delete]
others: [getHistoryById, getByRange]
# ApproverDetails (Embedded) — Defines the list of approvers along with the approval sequences
- name: approverDetails # Asset name
type: embedded
properties: # Asset attributes
- name: approverOrgId # Organization to which the approver belongs.
type: string
mandatory: true
validate: required()
- name: approverUserId # Specific user authorized to approve.
type: string
mandatory: true
validate: required()
- name: approvalSequence # Order of approval when sequential approvals are enforced.
type: number
mandatory: true
validate: positive()
# ApprovalTransactions — Tracks approval progress for a specific operation
- name: ApprovalTransactions # Asset name
properties: # Asset attributes
- name: approvalTransactionId # Unique ID for each approval action tied to operation and approver.
type: string
mandatory: true
id: true
derived:
strategy: concat
format: ["%1~%2~%3","approvalOperationId","approverOrgId", "approverUserId"]
- name: approvalOperationId # Identifier of the original transaction requiring approval.
type: string
mandatory: true
- name: fromAccountId # Source account involved in the operation.
type: string
mandatory: true
- name: toAccountId # Destination account for the operation.
type: string
mandatory: true
- name: approverOrgId # Organization of the approver performing the action.
type: string
mandatory: true
- name: approverUserId # User who approved the operation.
type: string
mandatory: true
- name: receivedApprovalsCount # Number of approvals completed so far.
type: number
mandatory: true
validate: min(0)
- name: requiredApprovalsCount # Total approvals needed before execution.
type: number
mandatory: true
validate: min(0)
- name: timestamp # Time when the approval was recorded for audit traceability.
type: string
mandatory: true
methods:
crud: [getById ]
others: []
# TransferRestriction — Defines global transaction boundaries
- name: TransferRestriction # Asset name
properties: # Asset attributes
- name: id # Unique identifier for the restriction rule.
type: string
mandatory: true
id: true
- name: transactionLowerLimit # Smallest allowable transfer amount in the system.
type: number
mandatory: true
default: 0
validate: min(0)
- name: transactionUpperLimit # Largest allowable transfer amount without special governance.
type: number
mandatory: true
default: 1000000
validate: min(0)
methods:
crud: [ ]
others: []
customMethods:
- "getApproverDetailsByTransferAmount(Amount: number)" # Customized method for fetching approver details