What is TXID? How to Find Your Transaction ID in Exchanges and Wallets

2026/03/24 06:03:02

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Every transaction broadcast to a blockchain network is assigned a unique identifier that acts as its permanent fingerprint on the ledger. This identifier — commonly called a TXID, or transaction ID — is the primary reference point for verifying that a transfer has been recorded, confirming its status, and resolving any disputes about whether a payment was sent or received. In a system where no central authority processes transfers, the TXID serves as the universal proof of a transaction's existence.

This article explains what a TXID is, how to find your transaction ID across exchanges and wallets, and what the data it points to actually mean for crypto users and traders.

Key Takeaways

A TXID (transaction ID) is a unique alphanumeric string that permanently identifies a specific transaction on a blockchain.
Every TXID is generated by applying a cryptographic hash function to the transaction's data, making it impossible to forge or duplicate.
TXIDs can be located in exchange withdrawal histories, wallet send records, and blockchain explorer search tools.
Entering a TXID into a block explorer reveals the transaction's confirmation status, the sending and receiving addresses, the amount transferred, and the network fee paid.
TXIDs serve as the standard form of proof when contacting support teams about missing or delayed transfers.
The format and length of a TXID varies by blockchain — Bitcoin TXIDs are 64 hexadecimal characters, while other networks follow their own hashing conventions.

What Is a Transaction ID?

A transaction ID, or TXID, is a fixed-length alphanumeric string that uniquely identifies a single transaction on a blockchain network. It is generated automatically at the moment a transaction is created and broadcast to the network, before any miner or validator has confirmed it. No two transactions share the same TXID — the identifier is mathematically derived from the transaction's contents, meaning even the smallest change to the transaction data would produce an entirely different hash.

The TXID is produced by running the raw transaction data through a cryptographic hash function. On the Bitcoin network, this function is SHA-256, applied twice in sequence, producing a 256-bit output displayed as a 64-character hexadecimal string. On Ethereum and EVM-compatible chains, the Keccak-256 hash function is used, also producing a 64-character hex string typically prefixed with "0x". Other blockchains apply their own hashing algorithms, but the principle — one unique identifier per transaction — is consistent across all major networks.

Because the TXID is derived directly from the transaction data, it functions as both an identifier and an implicit integrity check. If any detail of the transaction were altered after broadcast, the hash would change completely, producing a different TXID. This property is what makes TXIDs trustworthy as permanent records on a public ledger.

How to Find a Transaction ID

Finding a TXID depends on where the transaction originated — whether from an exchange account, a self-custody wallet, or a direct on-chain interaction. In all cases, the TXID becomes available as soon as the transaction has been signed and broadcast to the network.

Finding a TXID on KuCoin

On KuCoin, the TXID for any completed withdrawal is accessible through the account's transaction history:

Log in and navigate to Assets, then select Withdrawal History or Deposit & Withdrawal Records.
Locate the relevant transaction in the list, filtered by asset and date if needed.
Click on the transaction entry to expand its details. The TXID (sometimes labeled "Transaction Hash" or "TxHash") appears in the detail panel.
Copy the full TXID string — it is case-sensitive and must be copied exactly to use in a block explorer.

For deposits arriving on KuCoin, the TXID is equally visible in the deposit records section. If a deposit appears pending, the TXID allows the user to verify on-chain confirmation status independently of the platform's crediting process.

Finding a TXID in a Self-Custody Wallet

In software wallets and hardware wallets that interact with blockchains directly, TXIDs are typically found within the transaction history section of the application. Selecting any sent or received entry will display the full transaction details, including a link or copyable field containing the TXID. Many wallet interfaces include a direct "View on Explorer" button that opens the relevant block explorer with the TXID pre-loaded.

How to Use a TXID to Track a Transaction

Once a TXID has been obtained, it is entered into Block Explorer — a publicly accessible web tool that indexes all transactions recorded on a specific blockchain. Each major network has dedicated explorers that accept TXIDs as search inputs and return the full details of the transaction.

Entering a TXID into a block explorer returns the following information:

Confirmation count — The number of blocks added to the chain after the block containing the transaction. One confirmation means the transaction is in a block; six or more confirmations is the common threshold for finality on Bitcoin.
Block number — Identifies which block the transaction was included in.
Timestamp — The date and time the block was mined or validated.
Sender address(es) — The on-chain address(es) from which funds were spent.
Recipient address(es) — The on-chain address(es) receiving funds.
Amount transferred — The value moved, denominated in the native asset.
Network fee (gas/transaction fee) — The amount paid to validators or miners to process the transaction.
Transaction status — Whether the transaction is pending, confirmed, or failed.

A transaction that has been broadcast but not yet included in a block will show zero confirmations. This is normal during periods of network congestion, when the mempool — the queue of unconfirmed transactions — is backlogged. A failed transaction, by contrast, will show an explicit failure status in the explorer; on Ethereum-based chains, failed transactions are still recorded on-chain and consume gas fees.

Key Functions and Uses of a TXID

The TXID is not merely a reference number — it performs several distinct functions across different contexts in blockchain usage.

Proof of payment. In any dispute over whether a transfer was sent, the TXID provides verifiable, on-chain evidence. Because the blockchain is a public, immutable ledger, presenting a TXID to a recipient or a support team allows either party to independently confirm that the transaction occurred, when it occurred, and how much was sent.

Support ticket resolution. When a deposit has not appeared in an exchange account after the expected confirmation period, customer support teams request the TXID to investigate. With it, they can determine whether the transaction reached the receiving address, whether it had the correct network selected, or whether the delay is internal to the platform's crediting process.

Withdrawal verification. For users who initiate withdrawals on KuCoin's asset markets, the TXID confirms that funds actually left the platform and were broadcast to the blockchain. This distinguishes a successful on-chain broadcast from an internal processing delay.

Audit and accounting. Businesses and individuals managing crypto holdings for accounting or tax purposes use TXIDs as permanent references when reconciling on-chain activity with internal records. Each TXID corresponds to a single, unambiguous event on the ledger.

Smart contract interaction records. On networks such as Ethereum, TXIDs are generated not only for token transfers but also for every interaction with a smart contract — approvals, swaps, liquidity deposits, and more. Reviewing the TXID of a contract interaction in a block explorer reveals exactly which function was called and what state changes resulted.

Further reading on blockchain transaction mechanics and related concepts is available through the KuCoin research and education blog.

Transaction ID Examples

Understanding what a TXID looks like in practice — and how the same concept appears differently across blockchains — helps avoid confusion when locating and using these identifiers.

Bitcoin TXID Example

A Bitcoin transaction ID is a 64-character hexadecimal string, such as:

4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b

This string represents the double-SHA256 hash of the serialized transaction data. Entering it into a Bitcoin block explorer returns the complete record of that transaction, including its inputs and outputs. Notably, Bitcoin displays TXIDs in reversed byte order compared to the raw hash — a technical quirk of the protocol that explorers handle automatically.

Ethereum TXID Example

An Ethereum transaction hash follows the same 64-character hexadecimal format but is conventionally prefixed with "0x" to denote its hexadecimal encoding:

0x5c504ed432cb51138bcf09aa5e8a410dd4a1e204ef84bfed1be16dfba1b22060

This format is shared by all EVM-compatible chains, including those running on the same virtual machine architecture as Ethereum. The "0x" prefix is standard notation and is required when inputting hashes into most Ethereum-based explorers and interfaces.

TXID vs. Block Hash

A common source of confusion is the difference between a TXID and a block hash. A block hash identifies an entire block in the chain — it is the hash of the block header and encompasses all transactions within that block. A TXID, by contrast, identifies a single transaction within a block. Both are cryptographic hashes and look visually similar, but they serve distinct purposes and are not interchangeable when searching for transaction data.

What to Do When a TXID Shows No Confirmation

A transaction that remains unconfirmed for an extended period is stuck in the mempool. This most commonly occurs when the network fee attached to the transaction is set too low relative to current demand, causing miners or validators to deprioritize it in favor of higher-fee transactions.

Depending on blockchain and wallet in use, several approaches exist for resolving a stuck transaction:

Wait for fee pressure to ease. If network congestion decreases, lower-fee transactions in the mempool are eventually included in blocks.
Replace-By-Fee (RBF) on Bitcoin. If the original transaction was flagged as RBF-enabled at broadcast, the sender can broadcast a replacement transaction with a higher fee using the same inputs, causing the original to be superseded.
Child-Pays-for-Parent (CPFP) on Bitcoin. A recipient who has received unconfirmed outputs can spend them on a new transaction with a higher fee, incentivizing miners to confirm both the parent and child transactions together.
Speed up or cancel on Ethereum. Ethereum wallets that support nonce management allow users to broadcast a new transaction with the same nonce as the pending one, either replacing it with a higher-gas version of the original transfer or canceling it entirely by sending zero value to themselves.

In cases where a transaction cannot be sped up or replaced, particular withdrawals initiated by an exchange, the users should contact support and provide the TXID so the platform can investigate at the node level. Users can also monitor KuCoin platform announcements for any network-related notices affecting specific blockchain confirmations.

Conclusion

A TXID is the permanent, tamper-proof identifier assigned to every transaction recorded on a blockchain. It is generated through cryptographic hashing of the transaction data, ensures that each transaction is uniquely identifiable, and serves as the standard reference point for verification, dispute resolution, and auditing. Whether retrieved from an exchange withdrawal record or a wallet's send history, a TXID provides direct access to a complete record of the transaction through any compatible block explorer. Understanding how to locate and interpret a TXID is a foundational skill for anyone interacting with blockchain networks.

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FAQs

What is a TXID in crypto?

A TXID (transaction ID) is a unique alphanumeric string that identifies a specific transaction on a blockchain. It is generated by applying a cryptographic hash function to the transaction data at the time of broadcast. Every transaction has a distinct TXID, which can be used to look up its details on a block explorer.

How do I find the TXID for a withdrawal on KuCoin?

Navigate to your account's withdrawal or deposit history on KuCoin, then select the relevant transaction to expand its details. The TXID — sometimes labeled as "Transaction Hash" or "TxHash" — will appear in the detail panel and can be copied for use in a block explorer.

What does a TXID look like?

A TXID is typically a 64-character hexadecimal string. On Bitcoin it appears without a prefix, while on Ethereum and EVM-compatible networks it is conventionally prefixed with "0x". The exact format varies by blockchain but is always a fixed-length hash of the transaction's data.

Can two transactions have the same TXID?

No. Because a TXID is the cryptographic hash of a transaction's unique data — the inputs, outputs, amounts, and timestamps — the probability of two different transactions producing the same hash is computationally negligible. In practice, duplicate TXIDs do not occur on properly functioning blockchain networks.

What should I do if my TXID shows zero confirmations?

A zero-confirmation TXID means the transaction has been broadcast but not yet included in a block. This is often caused by a low network fee during high-congestion periods. Depending on the network, options include waiting for congestion to ease, using Replace-By-Fee if supported, or contacting the exchange's support team with the TXID for further assistance.

Is a TXID the same as a transaction receipt?

Not exactly. A TXID is the unique identifier for a transaction on blockchain. A transaction receipt, as defined on Ethereum, is a data object returned after a transaction is processed that contains the TXID alongside additional details such as gas used, logs, and execution status. The TXID is one component of the broader transaction receipt.

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