diff --git a/__tests__/utils/block.test.ts b/__tests__/utils/block.test.ts
new file mode 100644
index 000000000..9407e3c29
--- /dev/null
+++ b/__tests__/utils/block.test.ts
@@ -0,0 +1,133 @@
+import { Block } from '../../src/utils/provider';
+
+describe('new Block()', () => {
+  test('decimal number 0 BlockIdentifier', () => {
+    const block = new Block(0);
+    expect(block.identifier).toMatchObject({ block_number: 0 });
+    expect(block.queryIdentifier).toBe('blockNumber=0');
+    expect(block.hash).toBe(null);
+    expect(block.number).toBe(0);
+    expect(block.tag).toBe(null);
+  });
+
+  test('decimal number 631581 BlockIdentifier', () => {
+    const block1 = new Block(631581);
+    expect(block1.identifier).toMatchObject({ block_number: 631581 });
+    expect(block1.queryIdentifier).toBe('blockNumber=631581');
+    expect(block1.hash).toBe(null);
+    expect(block1.number).toBe(631581);
+    expect(block1.tag).toBe(null);
+  });
+
+  test('non-decimal number -1 BlockIdentifier', () => {
+    expect(() => {
+      const block = new Block(-1);
+      return block;
+    }).toThrow(TypeError);
+  });
+
+  test('decimal string `0` BlockIdentifier', () => {
+    const block = new Block('0');
+    expect(block.identifier).toMatchObject({ block_number: 0 });
+    expect(block.queryIdentifier).toBe('blockNumber=0');
+    expect(block.hash).toBe(null);
+    expect(block.number).toBe(0);
+    expect(block.tag).toBe(null);
+  });
+
+  test('decimal string `631581` BlockIdentifier', () => {
+    const block1 = new Block('631581');
+    expect(block1.identifier).toMatchObject({ block_number: 631581 });
+    expect(block1.queryIdentifier).toBe('blockNumber=631581');
+    expect(block1.hash).toBe(null);
+    expect(block1.number).toBe(631581);
+    expect(block1.tag).toBe(null);
+  });
+
+  test('non-decimal string `-1` BlockIdentifier', () => {
+    expect(() => {
+      const block = new Block('-1');
+      return block;
+    }).toThrow(TypeError);
+  });
+
+  test('(Irregular support) hex string `0x0` BlockIdentifier.', () => {
+    const block = new Block('0x0');
+    expect(block.identifier).toMatchObject({ block_hash: '0x0' });
+    expect(block.queryIdentifier).toBe('blockHash=0x0');
+    expect(block.hash).toBe('0x0');
+    expect(block.number).toBe(null);
+    expect(block.tag).toBe(null);
+  });
+
+  test('hex string `0x2a70fb03fe363a2d6be843343a1d81ce6abeda1e9bd5cc6ad8fa9f45e30fdeb` BlockIdentifier', () => {
+    const block = new Block('0x2a70fb03fe363a2d6be843343a1d81ce6abeda1e9bd5cc6ad8fa9f45e30fdeb');
+    expect(block.identifier).toMatchObject({
+      block_hash: '0x2a70fb03fe363a2d6be843343a1d81ce6abeda1e9bd5cc6ad8fa9f45e30fdeb',
+    });
+    expect(block.queryIdentifier).toBe(
+      'blockHash=0x2a70fb03fe363a2d6be843343a1d81ce6abeda1e9bd5cc6ad8fa9f45e30fdeb'
+    );
+    expect(block.hash).toBe('0x2a70fb03fe363a2d6be843343a1d81ce6abeda1e9bd5cc6ad8fa9f45e30fdeb');
+    expect(block.number).toBe(null);
+    expect(block.tag).toBe(null);
+  });
+
+  test('BigInt 1100871802642964430494835386862140987097292376415056243504467124241116103854n BlockIdentifier', () => {
+    const block = new Block(
+      1100871802642964430494835386862140987097292376415056243504467124241116103854n
+    );
+    expect(block.identifier).toMatchObject({
+      block_hash: '0x26f12449d649a5339d4891b312a381f23ebc1106792d169b42e6646e87304ae',
+    });
+    expect(block.queryIdentifier).toBe(
+      'blockHash=0x26f12449d649a5339d4891b312a381f23ebc1106792d169b42e6646e87304ae'
+    );
+    expect(block.hash).toBe('0x26f12449d649a5339d4891b312a381f23ebc1106792d169b42e6646e87304ae');
+    expect(block.number).toBe(null);
+    expect(block.tag).toBe(null);
+  });
+
+  test('String BigInt `1100871802642964430494835386862140987097292376415056243504467124241116103854n` BlockIdentifier', () => {
+    expect(() => {
+      const block = new Block(
+        '1100871802642964430494835386862140987097292376415056243504467124241116103854n'
+      );
+      return block;
+    }).toThrow(TypeError);
+  });
+
+  test('string `pending` BlockIdentifier', () => {
+    const block1 = new Block('pending');
+    expect(block1.identifier).toBe('pending');
+    expect(block1.queryIdentifier).toBe('blockNumber=pending');
+    expect(block1.hash).toBe(null);
+    expect(block1.number).toBe(null);
+    expect(block1.tag).toBe('pending');
+  });
+
+  test('string `latest` BlockIdentifier', () => {
+    const block1 = new Block('latest');
+    expect(block1.identifier).toBe('latest');
+    expect(block1.queryIdentifier).toBe('blockNumber=latest');
+    expect(block1.hash).toBe(null);
+    expect(block1.number).toBe(null);
+    expect(block1.tag).toBe('latest');
+  });
+
+  test('False string `supernova` BlockIdentifier', () => {
+    expect(() => {
+      const block = new Block('supernova');
+      return block;
+    }).toThrow(TypeError);
+  });
+
+  test('null BlockIdentifier', () => {
+    const block1 = new Block(null);
+    expect(block1.identifier).toBe('pending');
+    expect(block1.queryIdentifier).toBe('blockNumber=pending');
+    expect(block1.hash).toBe(null);
+    expect(block1.number).toBe(null);
+    expect(block1.tag).toBe('pending');
+  });
+});
diff --git a/__tests__/utils/utils.test.ts b/__tests__/utils/utils.test.ts
index f27e6fcf5..aa448a711 100644
--- a/__tests__/utils/utils.test.ts
+++ b/__tests__/utils/utils.test.ts
@@ -1,7 +1,6 @@
 import * as starkCurve from '@scure/starknet';
 
 import { constants, ec, hash, num, stark } from '../../src';
-import { Block } from '../../src/utils/provider';
 import { isBigInt, isHex } from '../../src/utils/num';
 
 const { IS_BROWSER } = constants;
@@ -117,22 +116,6 @@ describe('calculateContractAddressFromHash()', () => {
   });
 });
 
-describe('new Block()', () => {
-  test('Block identifier and queryIdentifier', () => {
-    const blockA = new Block(0);
-    expect(blockA.identifier).toMatchObject({ block_number: 0 });
-    expect(blockA.queryIdentifier).toBe('blockNumber=0');
-
-    const blockB = new Block('latest');
-    expect(blockB.identifier).toBe('latest');
-    expect(blockB.queryIdentifier).toBe('blockNumber=latest');
-
-    const blockC = new Block('0x01');
-    expect(blockC.identifier).toMatchObject({ block_hash: '0x01' });
-    expect(blockC.queryIdentifier).toBe('blockHash=0x01');
-  });
-});
-
 describe('Num utility functions', () => {
   describe('isBigInt', () => {
     test('should return true for big integers', () => {
diff --git a/src/types/lib/index.ts b/src/types/lib/index.ts
index e7c6d76ca..d96583f4a 100644
--- a/src/types/lib/index.ts
+++ b/src/types/lib/index.ts
@@ -210,9 +210,13 @@ export enum BlockTag {
 export type BlockNumber = BlockTag | null | number;
 
 /**
- * hex string and BN are detected as block hashes
+ * hex string and BigInt are detected as block hashes
+ *
  * decimal string and number are detected as block numbers
- * null appends nothing to the request url
+ *
+ * text string are detected as block tag
+ *
+ * null return 'pending' block tag
  */
 export type BlockIdentifier = BlockNumber | BigNumberish;
 
diff --git a/src/utils/provider.ts b/src/utils/provider.ts
index d76e99218..16da9105c 100644
--- a/src/utils/provider.ts
+++ b/src/utils/provider.ts
@@ -20,9 +20,9 @@ import { isSierra } from './contract';
 import { formatSpaces } from './hash';
 import { parse, stringify } from './json';
 import { isBigInt, isHex, isNumber, toHex } from './num';
+import { isDecimalString, isString } from './shortString';
 import { compressProgram } from './stark';
 import type { GetTransactionReceiptResponse } from './transactionReceipt';
-import { isString } from './shortString';
 
 /**
  * Helper - Async Sleep for 'delay' time
@@ -103,6 +103,15 @@ export function txIdentifier(txHash?: BigNumberish, txId?: BigNumberish): string
 
 export const validBlockTags = Object.values(BlockTag);
 
+/**
+ * hex string and BigInt are detected as block hashes. identifier return { block_hash: hash }
+ *
+ * decimal string and number are detected as block numbers. identifier return { block_number: number }
+ *
+ * text string are detected as block tag. identifier return tag
+ *
+ * null is detected as 'pending' block tag. identifier return 'pending'
+ */
 export class Block {
   hash: BlockIdentifier = null;
 
@@ -112,10 +121,14 @@ export class Block {
 
   private setIdentifier(__identifier: BlockIdentifier) {
     if (isString(__identifier)) {
-      if (isHex(__identifier)) {
+      if (isDecimalString(__identifier)) {
+        this.number = parseInt(__identifier, 10);
+      } else if (isHex(__identifier)) {
         this.hash = __identifier;
       } else if (validBlockTags.includes(__identifier as BlockTag)) {
         this.tag = __identifier;
+      } else {
+        throw TypeError(`Block identifier unmanaged: ${__identifier}`);
       }
     } else if (isBigInt(__identifier)) {
       this.hash = toHex(__identifier);
@@ -124,6 +137,10 @@ export class Block {
     } else {
       this.tag = BlockTag.pending;
     }
+
+    if (isNumber(this.number) && this.number < 0) {
+      throw TypeError(`Block number (${this.number}) can't be negative`);
+    }
   }
 
   constructor(_identifier: BlockIdentifier) {
diff --git a/src/utils/responseParser/rpc.ts b/src/utils/responseParser/rpc.ts
index acce51203..4a006ed94 100644
--- a/src/utils/responseParser/rpc.ts
+++ b/src/utils/responseParser/rpc.ts
@@ -20,8 +20,6 @@ import { toBigInt } from '../num';
 import { isString } from '../shortString';
 import { estimateFeeToBounds, estimatedFeeToMaxFee } from '../stark';
 import { ResponseParser } from '.';
-import { isString } from '../shortString';
-
 
 export class RPCResponseParser
   implements