Number of inputs in this transaction. Transaction inputs. See description of txIn below. Number of outputs in this transaction. Transaction outputs. See description of txOut below. A time Unix epoch time or block number.
Block Header (Cryptocurrency)
See the locktime parsing rules. The previous outpoint being spent. See description of outpoint below. The number of bytes in the signature script. Maximum is 10, bytes. Should only contain data pushes; see the signature script modification warning. Sequence number. Default for Bitcoin Core and almost all other programs is 0xffffffff. The TXID of the transaction holding the output to spend. The TXID is a hash provided here in internal byte order. The output index number of the specific output to spend from the transaction.
The first output is 0x Number of satoshis to spend. May be zero; the sum of all outputs may not exceed the sum of satoshis previously spent to the outpoints provided in the input section. Exception: coinbase transactions spend the block subsidy and collected transaction fees. Number of bytes in the pubkey script.
Defines the conditions which must be satisfied to spend this output. A byte null, as a coinbase has no previous outpoint. The number of bytes in the coinbase script, up to a maximum of bytes. The block height of this block as required by BIP Uses script language: starts with a data-pushing opcode that indicates how many bytes to push to the stack followed by the block height as a little-endian unsigned integer. This script must be as short as possible, otherwise it may be rejected.
Block hashing algorithm
The data-pushing opcode will be 0x03 and the total size four bytes until block 16,, about years from now. The coinbase field : Arbitrary data not exceeding bytes minus the 4 height bytes. Miners commonly place an extra nonce in this field to update the block header merkle root during hashing. See Alert System Retirement. Magic bytes indicating the originating network ; used to seek to next message when stream state is unknown.
Chapter 7. The Blockchain
ASCII string which identifies what message type is contained in the payload. Number of bytes in payload. The hash is a TXID. The hash is of a block header.
When used in a getdata message , this indicates the response should be a merkleblock message rather than a block message but this only works if a bloom filter was previously configured. Only for use in getdata messages.
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When used in a getdata message , this indicates the response should be a cmpctblock message. When used in a getdata message , this indicates the response should be a block message with transactions that have a witness using witness serialization. When used in a getdata message , this indicates the response should be a transaction message, if the witness structure is nonempty, the witness serialization will be used.
Reserved for future use, not used as of Protocol Version The protocol version number; the same as sent in the version message. The number of header hashes provided not including the stop hash. One or more block header hashes 32 bytes each in internal byte order. Hashes should be provided in reverse order of block height , so highest- height hashes are listed first and lowest- height hashes are listed last.
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The header hash of the last header hash being requested; set to all zeroes to request an inv message with all subsequent header hashes a maximum of will be sent as a reply to this message; if you need more than , you will need to send another getblocks message with a higher- height header hash as the first entry in block header hash field.
Number of block headers up to a maximum of 2, Note: headers-first sync assumes the sending node will send the maximum number of headers whenever possible. Block headers : each byte block header is in the format described in the block headers section with an additional 0x00 suffixed. The number of inventory entries. One or more inventory entries up to a maximum of 50, entries. One or more hashes of both transactions and merkle nodes in internal byte order.
Each hash is 32 bytes. A sequence of bits packed eight in a byte with the least significant bit first. May be padded to the nearest byte boundary but must not contain any more bits than that. Used to assign the hashes to particular nodes in the merkle tree as described below. The hash needs to be computed. Do not descend into its child nodes.
Append a 1 to the flag list; process the left child node. Then, if the node has a right child, process the right child. Do not append a hash to the hash list for this node. The index into the block at which this transaction is located. The transaction which is in the block at the index. The short transaction IDs calculated from the transactions which were not provided explicitly in prefilledtxn.
Vector of 6-byte integers in the spec, padded with two null-bytes so it can be read as an 8-byte integer. In version 2 of compact blocks , shortids should use the wtxid instead of txid as defined by BIP Used to provide the coinbase transaction and a select few which we expect a peer may be missing.
Vector of PrefilledTransaction structures defined above. A little-endian representation of a version number. Version 2 compact blocks should be specified by setting version to 2. The blockhash of the block which the transactions being requested are in. Vector of compactSize containing the indexes of the transactions being requested in the block. In version 2 of compact blocks , the wtxid should be used instead of the txid as defined by BIP The blockhash of the block which the transactions being provided are in.
What Does the Bitcoin Blockchain Record?
Vector of transactions, for an example hexdump of the raw transaction format, see the raw transaction section. IP address entries. See the table below for the format of a Bitcoin network IP address. A time in Unix epoch time format. Nodes advertising their own IP address set this to the current time.
Other nodes just relaying the IP address should not change the time.