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Small updates.

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This commit is contained in:
JoelKatz
2011-11-21 13:09:31 -08:00
parent 4d8894f71a
commit 34265cd55b
1 changed files with 21 additions and 16 deletions
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37
BinaryFormats.txt
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@@ -26,27 +26,33 @@ objects they consider abusively long (a 1KB transaction, for example).
1) Account ID 1) Account ID
An account starts as an ECDSA public key (X,Y), SECP256K1. Private keys are An account starts as an ECDSA public key (X,Y), SECP256K1. Private keys are
279 bytes, public keys are 65 bytes, signatures are 72 bytes. 279 bytes, public keys are normally 65 bytes, signatures are 72 bytes. We
use public keys in compressed form using
EC_KEY_set_conv_form(POINT_CONVERSION_COMPRESS) -- so our public keys are
actually 33 bytes.
Form a 65-byte quantity consisting of a single byte with the value 4, the Account IDs are based on the uncompressed public key. Form a 65-byte
32-byte X of the public key followed by the 32-byte Y of the public key. quantity consisting of a single byte with the value 4, the 32-byte X of the
Apply SHA256 to this 65-byte quantity. Apply RIPEMD160 to the result. public key followed by the 32-byte Y of the public key. Apply SHA256 to this
65-byte quantity. Apply RIPEMD160 to the result.
The resulting 20-byte value is the account ID. The resulting 20-byte value is the account ID.
2) Transaction (source/signed format) 148-bytes
2) Transaction (source/signed format)
Fields: Fields:
1) 64-byte source public key 1) 20-byte destination account
2) 20-byte destination account 2) 8-byte amount, unsigned BE integer
3) 8-byte amount, unsigned BE integer 3) 4-byte source account sequence number, unsigned BE integer
4) 4-byte source account sequence number, unsigned BE integer 4) 4-byte source ledger index, unsigned BE integer
5) 4-byte source ledger index, unsigned BE integer 5) 4-byte arbitrary source tag, unsigned BE integer
6) 4-byte arbitrary source tag, unsigned BE integer 6) 33-byte source public key
7) Prefix 0x54584E00 signature of 104-byte contents of fields 1-6 7) 3-byte padding (must be zero on send, ignore on receive)
8) 72-byte prefix 0x54584E00 signature of 76-byte contents of fields 1-6
The transaction ID is the first 256-bits of the SHA512 hash of the 148 byte
signed transaction.
3) Transaction (ledger format) 3) Transaction (ledger format)
@@ -64,10 +70,9 @@ Fields:
4) 32-byte hash of root of the transaction tree for this ledger 4) 32-byte hash of root of the transaction tree for this ledger
5) 32-byte hash of root of the account tree for this ledger 5) 32-byte hash of root of the account tree for this ledger
6) 8-byte timestamp 6) 8-byte timestamp
[remaining fields only in proposed ledger 7) 4-byte confidence, unsigned BE integer (0 = closed/accepted)
7) 4-byte confidence, unsigned BE integer x/255
8) Signature: 8) Signature:
Accepted: Prefix (0x4C475200) of 116 byte fields 1-6 Accepted: Prefix (0x4C475200) of 120 byte fields 1-6
Proposed: Prefix (0x4C475000) of 120 byte fields 1-8 Proposed: Prefix (0x4C475000) of 120 byte fields 1-8