Transaction Hash

By Marcus Reed | Last updated: October 26, 2026

A transaction hash is the unique ID that a blockchain assigns to each transaction. It is a long string of hexadecimal characters, and it stays the same as long as the transaction is on the chain. Paste it into a block explorer and you can see what happened to a payment without asking anyone for permission.

How the hash is made

Once a transaction is signed and broadcast, its data goes through a cryptographic hash function. That data includes the sender, the recipient, the amount and the fee. Bitcoin’s transaction ID uses SHA-256, applied twice. Ethereum uses Keccak-256. Both functions are one-way and extremely sensitive to input, so changing one character produces a completely different output.

What a hash looks like

Bitcoin hashes are 64 hexadecimal characters with no prefix. Ethereum hashes start with 0x, followed by 64 characters. Hexadecimal uses only the digits 0-9 and the letters a-f. That is useful when you check a copied hash: a letter from g to z means something went wrong during copying.

Example format (not a real transaction):

0x4f8a2c9e1b7d03f6a5c48e2d9b1f0a7c6e3d5b8a2f9c1e4d7b6a0f3e8c2d5b91

Why it matters at a crypto casino

When you deposit crypto, the hash shows that the funds reached the casino’s address, how many confirmations the transfer has, and how much arrived. When you withdraw, the hash shows that the payout left the casino and went to the address you provided.

A hash proves a payment. It does not prove that a game was fair. Game fairness is a separate question, answered by provably fair seeds and hash verification. Readers often mix the two up, so casino pages should keep them apart.

How to check a transaction hash

1. Copy the hash from your deposit or withdrawal record.
2. Open a block explorer for that network. Etherscan covers Ethereum, and mempool.space covers Bitcoin.
3. Paste the hash into the search field.
4. Check the status, the number of confirmations, the sender and recipient addresses, and the amount.

A transaction is pending when it has been broadcast but not yet included in a block. It is confirmed once it is in a block and enough blocks have been added after it. How long this takes depends on the network and the fee. The pending withdrawal entry covers the details, and on Ethereum the cost is explained in gas fees.

Transaction hash and wallet address

A crypto wallet address can receive payments for as long as it exists. A transaction hash identifies one transfer. One address can take part in thousands of transactions, and each one has its own hash.

Frequently asked questions

Can two transactions share a hash?

No. Under normal cryptographic conditions, every transaction gets a unique hash. Changing any input, even one character, produces a different output.

Does a transaction hash prove that a casino game was fair?

No. A hash only shows that a transfer was recorded on the blockchain. Game fairness is checked separately, using server seeds and client seeds under a provably fair system.

Does the hash change after confirmation?

For a standard transaction, no. Confirmations add blocks on top of it, but the hash stays the same. On Bitcoin, replace-by-fee can create a new transaction with a new hash when a sender speeds one up, so check the latest hash if a withdrawal was accelerated.