A Controllable Secure Blockchain-Based Electronic Healthcare Records Sharing Scheme

Algorithm 1

BEAS.publish (EHR).

(i)	//add the EHR file to IEFS and get the hash-valued file address
(ii)	H_Address = IEFS.add(EHR);
(iii)	H_Address = encrypt(H_Address, P_PKey);
(iv)	//publish the EHR abstract to the blockchain of BEAS
(v)	Signature = encrypt(hash(H_Name, Keywords, P_ID, D_ID, H_Address),D_SKey);
(vi)	Res = BEAS.validate_save(H_Name, Keywords, P_ID, Signature, D_ID,H_Address)
(vii)	if Res then
(viii)	return EHR_ID;
(ix)	else
(x)	return Null;