add ref_block field to Block

etc/sqlite/queries.sql

@@ -11,11 +11,12 @@ CREATE TABLE IF NOT EXISTS blockchains (
 
 CREATE TABLE IF NOT EXISTS blocks (
   id VARCHAR(64) UNIQUE PRIMARY KEY NOT NULL,
-  chain_id  VARCHAR(64) NOT NULL,
+  chain_id VARCHAR(64) NOT NULL,
   type TEXT NOT NULL,
   prev TEXT UNIQUE,
   signature TEXT UNIQUE NOT NULL,
   payload TEXT,
+  ref_block TEXT,
   commitment_amount TEXT,
   commitment_balance TEXT,
   rangeproof_amount TEXT,
@@ -26,7 +27,8 @@ CREATE TABLE IF NOT EXISTS blocks (
   sender_balance TEXT,
   sender_amount TEXT,
   FOREIGN KEY (chain_id) REFERENCES blockchains(id),
-  FOREIGN KEY (prev) REFERENCES blocks(signature)
+  FOREIGN KEY (prev) REFERENCES blocks(signature),
+  FOREIGN KEY (ref_block) REFERENCES blocks(signature)
 );
 
 -- example queries

etc/sqlite/sqlite.md

@@ -20,6 +20,7 @@
 | prev | FK -> blocks.signature, unique | **TEXT** signature reference to chain blocks |
 | signature | unique, not null | **TEXT** own block signature |
 | payload | - | **TEXT** encrypted arbitrary data that is stored on the blockchain |
+| ref_block | FK -> blocks.signature | **TEXT** signature reference to a block of another chain |
 | commitment_amount | - | **TEXT** pedersen amount commitment |
 | commitment_balance | - | **TEXT** pedersen balance commitment |
 | receiver_amount | - | **TEXT** encrypted amount for the receiving party |

src/Block.ts

@@ -31,6 +31,7 @@ export type Block = {
   type: BlockType;
   prev: Signature | null;
   payload: EncryptedString;
+  refBlock: Signature | null;
   amountCommitment: string;
   balanceCommitment: string;
   amountRangeProof: string;