;; Cross-Chain Bridge Contract
(define-constant contract-owner tx-sender)
(define-constant err-unauthorized (err u401))
(define-constant err-invalid-amount (err u402))
(define-constant err-bridge-paused (err u403))
;; Bridge state
(define-data-var bridge-paused bool false)
(define-data-var bridge-fee uint u1000) ;; 0.1% fee
;; Cross-chain transaction tracking
(define-map bridge-transactions
{tx-id: (buff 32)}
{sender: principal, amount: uint, target-chain: (string-ascii 20), status: (string-ascii 10)})
(define-map chain-validators (string-ascii 20) (list 5 principal))
;; Initialize bridge
(define-public (init-bridge)
(begin
(asserts! (is-eq tx-sender contract-owner) err-unauthorized)
(var-set bridge-paused false)
(print {event: "bridge-initialized", by: tx-sender})
(ok true)))
;; Lock assets for bridge transfer
(define-public (lock-for-bridge (amount uint) (target-chain (string-ascii 20)) (tx-id (buff 32)))
(let ((fee (/ (* amount (var-get bridge-fee)) u100000)))
(asserts! (not (var-get bridge-paused)) err-bridge-paused)
(asserts! (> amount fee) err-invalid-amount)
(try! (stx-transfer? amount tx-sender (as-contract tx-sender)))
(map-set bridge-transactions {tx-id: tx-id}
{sender: tx-sender, amount: (- amount fee), target-chain: target-chain, status: "locked"})
(print {event: "bridge-lock", tx-id: tx-id, sender: tx-sender, amount: (- amount fee), target-chain: target-chain})
(ok (- amount fee))))
;; Release assets from bridge
(define-public (release-from-bridge (tx-id (buff 32)) (recipient principal))
(let ((tx-data (unwrap! (map-get? bridge-transactions {tx-id: tx-id}) (err u404))))
(asserts! (is-eq tx-sender contract-owner) err-unauthorized)
(asserts! (is-eq (get status tx-data) "locked") (err u405))
(try! (as-contract (stx-transfer? (get amount tx-data) tx-sender recipient)))
(map-set bridge-transactions {tx-id: tx-id}
(merge tx-data {status: "released"}))
(print {event: "bridge-release", tx-id: tx-id, recipient: recipient, amount: (get amount tx-data)})
(ok (get amount tx-data))))
;; Emergency pause
(define-public (pause-bridge)
(begin
(asserts! (is-eq tx-sender contract-owner) err-unauthorized)
(var-set bridge-paused true)
(print {event: "bridge-paused", by: tx-sender})
(ok true)))
(define-read-only (get-bridge-status)
(var-get bridge-paused))
(define-read-only (get-transaction (tx-id (buff 32)))
(map-get? bridge-transactions {tx-id: tx-id}))