;; title: loan-manager
;; version:
;; summary:
;; description:
;; traits
;;
;; Anonymous Reputation Protocol (ARP) Smart Contract
;; A zero-knowledge reputation system enabling users to build verifiable trust scores
;; while maintaining complete privacy through cryptographic commitments and decentralized verification.
;; Users can participate anonymously in reputation networks, verify credentials through ZK-proofs,
;; and engage in trust-based interactions without revealing personal information or creating
;; traceable on-chain footprints.
;; ERROR CODES
(define-constant contract-owner tx-sender)
(define-constant ERR-ACCESS-DENIED (err u100))
(define-constant ERR-PROFILE-ALREADY-EXISTS (err u101))
(define-constant ERR-PROFILE-NOT-FOUND (err u102))
(define-constant ERR-INVALID-COMMITMENT (err u103))
(define-constant ERR-VERIFICATION-FAILED (err u104))
(define-constant ERR-INSUFFICIENT-REPUTATION (err u105))
(define-constant ERR-MALFORMED-PROOF (err u106))
(define-constant ERR-CHALLENGE-EXPIRED (err u107))
(define-constant ERR-ALREADY-COMPLETED (err u108))
(define-constant ERR-INVALID-PARAMETERS (err u109))
(define-constant ERR-SYSTEM-LOCKED (err u110))
(define-constant ERR-GROUP-ACCESS-DENIED (err u111))
;; PROTOCOL PARAMETERS
(define-constant min-reputation-threshold u10)
(define-constant max-reputation-cap u1000)
(define-constant challenge-expiry-blocks u144) ;; ~24 hours on Stacks
(define-constant commitment-validity-period u1008) ;; ~1 week
(define-constant starter-reputation-amount u100)
(define-constant max-interaction-categories u10)
(define-constant supported-challenge-types u5)
(define-constant max-proof-categories u10)
;; DATA STRUCTURES
;; Core anonymous user profiles
(define-map user-reputation-profiles
{ profile-hash: (buff 32) }
{
privacy-commitment: (buff 32),
reputation-score: uint,
trust-level: uint,
created-at-block: uint,
last-active-block: uint,
is-active: bool,
metadata-hash: (optional (buff 32))
}
)
;; Links principals to their anonymous profiles (kept private)
(define-map profile-ownership-links
{ owner: principal }
{
controlled-profile-hash: (buff 32),
linked-at-block: uint
}
)
;; Active verification challenges
(define-map active-verification-challenges
{ challenge-id: (buff 32) }
{
target-profile-hash: (buff 32),
challenger: principal,
challenge-type: uint,
commitment-proof: (buff 32),
started-at-block: uint,
is-resolved: bool,
challenge-result: (optional bool)
}
)
;; Reputation transfer history
(define-map reputation-transfer-log
{ transfer-id: (buff 32) }
{
sender-profile-hash: (buff 32),
receiver-profile-hash: (buff 32),
interaction-type: uint,
reputation-amount: int,
processed-at-block: uint,
proof-hash: (buff 32)
}
)
;; Zero-knowledge proof storage
(define-map zk-proof-registry
{ proof-id: (buff 32) }
{
submitter-profile-hash: (buff 32),
proof-type: uint,
proof-data: (buff 512),
is-verified: bool,
submitted-at-block: uint
}
)
;; Anonymous group registry
(define-map reputation-groups
{ group-id: (buff 32) }
{
display-name: (string-ascii 64),
min-reputation-required: uint,
member-count: uint,
created-at-block: uint,
is-operational: bool
}
)
;; Group membership tracking
(define-map group-memberships
{ membership-id: (buff 32) }
{
group-id: (buff 32),
member-commitment: (buff 32),
joined-at-block: uint,
is-active: bool
}
)
;; SYSTEM STATE
(define-data-var total-profiles-count uint u0)
(define-data-var total-verifications-completed uint u0)
(define-data-var circulating-reputation-supply uint u10000)
(define-data-var min-reputation-for-verification uint u50)
(define-data-var system-maintenance-active bool false)
;; CRYPTOGRAPHIC UTILITIES
;; Generate unique profile hash from multiple entropy sources
(define-private (create-profile-hash
(primary-commitment (buff 32))
(secondary-entropy (buff 32))
(block-nonce uint))
(keccak256
(concat
(concat primary-commitment secondary-entropy)
(unwrap-panic (to-consensus-buff? block-nonce))
)
)
)
;; Create tamper-proof proof identifier
(define-private (generate-proof-hash
(submitter-profile (buff 32))
(proof-content (buff 512))
(timestamp-salt uint))
(keccak256
(concat
(concat submitter-profile (keccak256 proof-content))
(unwrap-panic (to-consensus-buff? timestamp-salt))
)
)
)
;; VALIDATION HELPERS
;; Verify commitment meets format requirements
(define-private (is-valid-commitment (commitment (buff 32)))
(> (len commitment) u0)
)
;; Check if profile exists in system
(define-private (profile-exists (profile-hash (buff 32)))
(is-some (map-get? user-reputation-profiles { profile-hash: profile-hash }))
)
;; Get current blockchain height
(define-private (current-block-height)
stacks-block-height
)
;; Validate reputation change is within acceptable bounds
(define-private (is-valid-reputation-delta (delta int))
(and (>= delta -100) (<= delta 100))
)
;; Calculate new reputation with overflow protection
(define-private (calculate-new-reputation (current-rep uint) (delta int))
(let ((new-reputation
(if (< delta 0)
(if (>= current-rep (to-uint (- 0 delta)))
(- current-rep (to-uint (- 0 delta)))
u0)
(+ current-rep (to-uint delta)))))
(if (> new-reputation max-reputation-cap)
max-reputation-cap
new-reputation))
)
;; Validate zero-knowledge proof format
(define-private (is-valid-zk-proof (proof-data (buff 512)))
(and
(> (len proof-data) u0)
(<= (len proof-data) u512)
)
)
;; Verify hash format compliance
(define-private (is-valid-hash-format (hash-data (buff 32)))
(is-eq (len hash-data) u32)
)
;; Validate optional metadata format
(define-private (is-valid-metadata (metadata (optional (buff 32))))
(match metadata
data (is-eq (len data) u32)
true
)
)
;; PUBLIC READ-ONLY FUNCTIONS
;; Get complete profile information
(define-read-only (get-profile-details (profile-hash (buff 32)))
(map-get? user-reputation-profiles { profile-hash: profile-hash })
)
;; Retrieve current reputation score for a profile
(define-read-only (get-reputation-score (profile-hash (buff 32)))
(match (map-get? user-reputation-profiles { profile-hash: profile-hash })
profile (ok (get reputation-score profile))
ERR-PROFILE-NOT-FOUND
)
)
;; Check if profile has been verified
(define-read-only (is-profile-verified (profile-hash (buff 32)))
(match (map-get? user-reputation-profiles { profile-hash: profile-hash })
profile (ok (>= (get trust-level profile) u1))
ERR-PROFILE-NOT-FOUND
)
)
;; Get verification challenge details
(define-read-only (get-challenge-info (challenge-id (buff 32)))
(map-get? active-verification-challenges { challenge-id: challenge-id })
)
;; Retrieve group information
(define-read-only (get-group-details (group-id (buff 32)))
(map-get? reputation-groups { group-id: group-id })
)
;; Get comprehensive protocol metrics
(define-read-only (get-protocol-metrics)
{
total-profiles: (var-get total-profiles-count),
completed-verifications: (var-get total-verifications-completed),
reputation-in-circulation: (var-get circulating-reputation-supply),
verification-threshold: (var-get min-reputation-for-verification),
maintenance-mode: (var-get system-maintenance-active)
}
)
;; External proof format validation
(define-read-only (validate-proof-format (proof-data (buff 512)))
(is-valid-zk-proof proof-data)
)