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In simpler terms, if an unconfirmed transaction returns a confidence factor of By design, we're conservative. As you may have gathered from the frequency of links to this feature in these docs, we're exceptionally proud of the work we've done to build this feature and provide it to our users. And that pride extends to our own confidence in our confidence product. We've leveraged this product internally on a major feature: our live block explorer visually shows confidence intervals on unconfirmed transactions directly.

Check out a live view of bitcoin and click on one of the most recent unconfirmed transactions. There are a host of factors that go into our confidence calculation, but you can broadly organize them into two categories. The shape of transactions refers to aspects of transactions that don't vary with time time-invariant in our model.

The behavior of transactions refers to aspects of transactions that do vary with time time-variant in our model. On the shape side of our model, we ask a number of questions about a transaction: How is it structured?

What are its inputs and outputs? What's its signature type? Broadly speaking, without knowing anything about the network, does it look like this transaction will be confirmed soon? The behavior part of our model primarily focuses on how a transaction propagates through the network. In order to model this correctly, you need both a great connection to the network and a lot of past data, which we have. By monitoring transaction propagation, the number of nodes that have received it, and how quickly they received it, we can calculate its probability to be the "winning" transaction at any given point in time, if a double-spend was attempted.

The result is a robust and reliable metric for judging unconfirmed transaction confidence, especially when used in concert with webhooks and websockets. Our work here is based on several public research results in addition to our own in-depth follow-up research, which you can read about here. We are constantly improving our confidence model, and we always publish our findings when we do.

The returned TXConfidence object contains the all-important confidence percentage, receive count and more. You can find an unconfirmed transaction hash from our block explorer here. Cryptocurrency addresses, transactions, and blocks are extremely powerful, but the labels they employ can be That's why we have a Metadata API, allowing both public and private key-value storage against addresses, transactions, and blocks. The Metadata API supports both public and private key-value storage.

In both cases, setting metadata requires use of a token if you haven't already, you can register for one here. Public metadata is immutable ; once set, it cannot be modified or deleted. If you accidentally set public metadata and need it deleted, contact us. Also, as implied by the name, it's openly accessible to the whole worldregardless of whether they have a token or not.

Consequently, private metadata is associated and only accessible with your user token. The methods for interacting with metadata are outlined below. If another key with the same name already exists under your private metadata store, supplying a new value will replace it. New key-value pairs will be added without replacing prexisting key-value pairs. Blockchains are about transferring value and ownership, so why can't that value extend beyond a blockchain's native token?

Thanks to the possibility of embedding arbitrary data through null-data outputs, a blockchain can! However, the act of creating these alternate forms of valueand choosing a format that was universally readablecan be fraught with difficulty. We built our Asset API to simplify that process. Now instead of spelunking through a blockchain's native transactions and interpreting them yourself, you can utilize this set of APIs to easily issue, check, and transfer assets.

This set of endpoints currently leverages the Open Assets Protocol , a simple, robust method of embedding assets across any blockchain that supports null-data outputs. Asset addresses are just like regular bitcoin addresses, and are generated from a private-public keypair. They only differ by a prefix ex: 'a' for instead of '1' to distinguish them. Note that while it returns an Address object, anything that would have represented "satoshis" now represents "amount of asset.

One of the well-known benefits of cryptocurrency is the ability to allow users to partake in online commerce without necessarily requiring extensive setup barriers, like registering new accounts. In that spirit, our Address Forwarding API is the easiest way to acceptand consolidatepayments securely without forcing your users to create accounts and jump through unnecessary loops.

It's also a generic way to automatically transfer value from one address to another. While there are many possible use cases, the two we hear most about are:. We do not take a fee on address forwarding, other than the required miner fee which depends on network conditions; forwards are free. However, as part of your own services, you can include a fee either fixed or a percentage that will also be automatically transfered to your own address in the same transaction.

Fee-based business models are thus easily achieved, and moreover, easily auditable via the blockchain. First, to create an address forwarding address, you need to POST a partially filled AddressForward object to the payment creation endpoint. You can see more details about these options in the AddressForward object details. This returns the full array of your currently active address forwarding addresses, based on your token.

By default, this endpoint only returns the first address forwards. If you have more, you can page through them using the optional start parameter. Blockchains are highly transactional systems. Many usage patterns require knowing when an event occurs: i. Instead of requiring you to continuously poll resources, we provide push APIs to facilitate those use cases, and support both WebSockets and WebHooks. WebSockets are typically used in client applications when a server is not already running: e.

WebHooks are the most reliable way to get event notifications but requires running a server to receive the callbacks. We automatically retry HTTP requests 5 times. We support a number of different event types, and you can filter your notification requests depending on how you structure your Event request object. The code may differ if you're not programming in Javascript check relevant code examples for our standard libraries but the URL will be identical.

In addition to standard events, WebSockets accept a "ping" event. If you send the following, you will receive the same message back with "ping" replaced by "pong":. A regular ping i. We retry individual payloads to your url five times; if one fails, we wait exponentially between retries: 1 second, 2s, 4s, 8s, 16s. Using a partially filled out Event , you can create a WebHook using this resource. Check the Event object description and types of events to understand the options available for your events.

If successful, it will return the Event with a newly generated id. This resource deletes an active Event based on its id. Remember to include your token, or the request will fail. To guarantee the origin and integrity of the webhook data, webhooks can optionally be signed by our servers. An optional JSON attribute called "signkey" can be provided with the webhook when created to either:.

Once the "signkey" attribute is set on a webhook, all webhook requests will be signed following the shaecdsa scheme of the HTTP signatures specification. This section list all the updates in reverse chronological order. We support the new bech32m address format for v1 witness. This is fixed. We've added new filters possibilities to the Unconfirmed Transactions Endpoint. The data endpoint no longer exists as it was uneconomical and thus non functional since a long time.

BlockCypher Node. We've added the virtual size vsize for segwit transaction. For regular non-segwit transaction the vsize is the same as the size. This is how you can see how much fees you are saving by using segwit. We've created this new "Updates" section to let you know about the new feature and bugfixes we deployed :. Following last week Dogecoin chain lag due to unhealthy network conditions, we've added new DNS seeds thanks to Denarius.

Following previous updates to enhance the support of "Maddrs" on Litecoin, we've added several bugfixes:. See the TXOutput object for more details. The command is designed to work without user interaction. GetChain if err! GetBlock v , "" , nil if err! Faucet pair , if err! GetBlock 0 , "dc20bdf6bbaefdb" , nil if err! GetBlock , "" , params if err! GenAddrKeychain if err! GenAddrMultisig gobcy. CreateWallet gobcy. CreateHDWallet gobcy. TODO: ruby examples. ListWallets if err!

GetHDWallet "bob" if err! GetAddrHDWallet "bob" , nil if err! GenAddrWallet "alice" if err! DeleteHDWallet "bob" if err! GetTX "faebaebccddf3cfebcdf58bd" , nil if err! GetUnTX if err! Creating transactions manually is very complicated. We recommend you look at blockcypher.

Faucet addr1 , 3e5 if err! NewTX gobcy. TempNewTX addr1. Address , addr2. SendTX skel if err! Signing is handled by our SDK in the next step. PushTX "fddf3ddaaede31adcb28c73cace2fbbbb9b8c3fed6dcbafcbf9f0aafba9bb50f1efcb4cedcfbdcecb17f04f5fa1bdef33faa2ba7fa28c56a50facab96affffffffdacdcacaee1ea3f57ecedd1d09eacccadcc1af6a69bf12e90cbac" if err!

DecodeTX "fddf3ddaaede31adcb28c73cace2fbbbb9b8c3fed6dcbafcbf9f0aafba9bb50f1efcb4cedcfbdcecb17f04f5fa1bdef33faa2ba7fa28c56a50facab96affffffffdacdcacaee1ea3f57ecedd1d09eacccadcc1af6a69bf12e90cbac" if err! Create a custom payload, then use the function: BlockCypher. GetTXConf "bb01beeabe16b5d59dd3edf41abbeeffffdd2a" if err!

CreatePayFwd gobcy. ListPayFwds if err! DeletePayFwd "6fbe2bfeacdcbc4d5fcc " if err! CreateHook gobcy. ListHooks if err! GetHook "86acb-babdead4" if err! DeleteHook "86acb-babdead4" if err! A rolling average of the fee in satoshis paid per kilobyte for transactions to be confirmed within 1 to 2 blocks.

A rolling average of the fee in satoshis paid per kilobyte for transactions to be confirmed within 3 to 6 blocks. A rolling average of the fee in satoshis paid per kilobyte for transactions to be confirmed in 7 or more blocks. Optional The current height of the latest fork to the blockchain; when no competing blockchain fork present, not returned with endpoints that return Blockchains.

Optional The hash of the latest confirmed block in the latest fork of the blockchain; when no competing blockchain fork present, not returned with endpoints that return Blockchains. The height of the block in the blockchain; i. The depth of the block in the blockchain; i. Optional Raw size of block including header and all transactions in bytes.

Not returned for bitcoin blocks earlier than height Optional Raw size of block including header and all transactions in virtual bytes. The time BlockCypher's servers receive the block. Our servers' clock is continuously adjusted and accurate. The number used by a miner to generate this block. To get more details about specific transactions, you must concatenate this URL with the desired transaction hash es. The Merkle root of this block. Optional If there are more transactions that couldn't fit in the txids array, this is the BlockCypher URL to query the next set of transactions within a Block object.

Height of the block that contains this transaction. If this is an unconfirmed transaction, it will equal The hash of the transaction. While reasonably unique, using hashes as identifiers may be unsafe. The likelihood that this transaction will make it to the next block; reflects the preference level miners have to include this transaction. Can be high, medium or low.

Version number, typically 1 for Bitcoin transactions. Time when transaction can be valid. Can be interpreted in two ways: if less than million, refers to block height. If more, refers to Unix epoch time. Number of subsequent blocks, including the block the transaction is in.

Unconfirmed transactions have 0 confirmations. Optional The percentage chance this transaction will not be double-spent against, if unconfirmed. For more information, check the section on Confidence Factor. Optional Time at which transaction was included in a block; only present for confirmed transactions.

Optional Number of peers that have sent this transaction to BlockCypher; only present for unconfirmed transactions. Optional Address BlockCypher will use to send back your change, if you constructed this transaction. If not set, defaults to the address from which the coins were originally sent. Optional Hash of the block that contains this transaction; only present for confirmed transactions. Optional Canonical, zero-indexed location of this transaction in a block; only present for confirmed transactions.

Optional If this transaction is a double-spend i. Data protocols currently detected: blockchainid ; openassets ; factom ; colu ; coinspark ; omni. Optional Hex-encoded bytes of the transaction, as sent over the network. The previous transaction hash where this input was an output. Not present for coinbase transactions. The index of the output being spent within the previous transaction.

The value of the output being spent within the previous transaction. Legacy 4-byte sequence number , not usually relevant unless dealing with locktime encumbrances. Optional Number of confirmations of the previous transaction for which this input was an output. Currently, only returned in unconfirmed transactions. Only used when constructing transactions via the Creating Transactions process. Addresses that correspond to this output; typically this will only have a single address, and you can think of this output as having "sent" value to the address contained herein.

Optional The transaction hash that spent this output. Only returned for outputs that have been spent. The spending transaction may be unconfirmed. The age of the transaction in milliseconds, based on the earliest time BlockCypher saw it relayed in the network. Number of peers that have sent this transaction to BlockCypher; only positive for unconfirmed transactions.

A number from 0 to 1 representing BlockCypher's confidence that the transaction won't be double-spent against. If it's unconfirmed, this will equal The likelihood that the enclosing transaction will make it to the next block; reflects the preference level miners have to include the enclosing transaction. If it's an input, or an unspent output, it will be false. Optional The past balance of the parent address the moment this transaction was confirmed. Not present for unconfirmed transactions.

Optional Time this transaction was received by BlockCypher's servers; only present for unconfirmed transactions. Array of signatures corresponding to all the data in tosign , typically provided by you. Array of public keys corresponding to each signature. In general, these are provided by you, and correspond to the signatures you provide.

Optional Array of hex-encoded, work-in-progress transactions; optionally returned to validate the tosign data locally. Optional Array of errors in the form "error":"description-of-error". This is only returned if there was an error in any stage of transaction generation, and is usually accompanied by a HTTP code. Optional The requested address. Optional The requested wallet object. Only returned if querying by wallet name instead of public address.

Optional The requested HD wallet object. Only returned if querying by HD wallet name instead of public address. Balance of confirmed satoshis on this address. This is the difference between outputs and inputs on this address, but only for transactions that have been included into a block i. Balance of unconfirmed satoshis on this address.

Can be negative if unconfirmed transactions are just spending outputs. Only unconfirmed transactions haven't made it into a block are included. Number of confirmed transactions on this address. Number of unconfirmed transactions for this address. Final number of transactions, including confirmed and unconfirmed transactions, for this address.

Optional To retrieve base URL transactions. Optional Array of full transaction details associated with this address. Usually only returned from the Address Full Endpoint. Optional Array of transaction inputs and outputs for this address. Usually only returned from the standard Address Endpoint.

Optional All unconfirmed transaction inputs and outputs for this address. Optional If true , then the Address object contains more transactions than shown. Useful for determining whether to poll the API for more transaction information. Wallet import format , a common encoding for the private key. Optional Array of public keys to provide to generate a multisig address. Optional If generating a multisig address, the type of multisig script; typically "multisig-n-of-m", where n and m are integers.

Optional If generating an OAP address , this represents the parent blockchain's underlying address the typical address listed above. A single chain is returned if the wallet has no subchains. The extended public key all addresses in the HD wallet are derived from.

It's encoded in BIP32 format. Optional Hex-encoded metadata that can optionally be encoded into the issue or transfer transaction. Unique indentifier associated with this asset; can be used to query other transactions associated with this asset. This transaction's unique hash; same as the underlying transaction on the asset's parent blockchain. Optional Time this transaction was confirmed; only returned for confirmed transactions.

Optional Associated hex-encoded metadata with this transaction, if it exists. Array of input data, which can be seen explicitly in the cURL example. Very similar to array of TXInput s, but with values related to assets instead of satoshis. Array of output data, which can be seen explicitly in the cURL example. Very similar to array of TXOutput s, but with values related to assets instead of satoshis.

Type of event; can be unconfirmed-tx , new-block , confirmed-tx , tx-confirmation , double-spend-tx , tx-confidence. The hash can either be for a block or a transaction. If used, requires a user token. A wallet name can also be used instead of an address, which will then match on any address in the wallet.

You'll receive an updated TX for every confirmation up to this amount. The maximum allowed is 10; if not set, it will default to 6. You'll receive a TX once this threshold is met. Will accept any float between 0 and 1, exclusive; if not set, defaults to 0. The address which will automatically forward to destination ; generated when a new request is created. Could you be next big winner? Tags: acquisition blockrio coinbase Featured Online.

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An an interesting development today, San Francisco-based Coinbase has acquired blockchain explorer Blockr.

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