Algorithm A2: Collect cross-chain smart contract B(CCSC-B)

Input: DATA; CCSC- A; N; skp 1:func Get-Crack (DATA, skp)// Obtain DATA and use user skp to decrypt to obtain Ds, etc. { For t in range (m) If Preliminary decryption of DATA:   Get user private key skp   Decrypt DATA   Return Dn, H(N), Ds and true } 2: func Pre-stored(Ds)// Pre-storage based on data summary, get AD { For t in range (m) If data pre-storage: Data preprocessing based on data summaries Return AD Return false } 3:func Get(N)// Obtain N through data interaction { For t in range (m) If Get random number N: Transfer(CCSC-A) Return CCSC-A$\to$N; AD$\to$CCSC-A// N and AD exchange to obtain If decrypt DATA:   Decrypt with N to get D   Get H(D) for D hash, verify whether D has been tampered with } 4: func Storage(D)// Store according to the pre-stored address { For t in range (m) If Data storage to parallel blockchain:   Store D to the corresponding parallel blockchain   Return Send Y/F to CCSC-A }