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Alex Grintsvayg 2019-02-07 16:29:37 -05:00
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@ -72,7 +72,7 @@ The blockchain serves three key purposes:
1. An index of the content available on the network
2. A payment system and record of purchases for priced content
3. Cryptographic publisher identities
3. A source of cryptographic publisher identities
### Stakes
@ -689,14 +689,14 @@ Content on LBRY is encoded to facilitate distribution.
#### Blobs
The smallest unit of data is called a _blob_. A blob is an encrypted chunk of data up to 2MiB in size. Each blob is indexed by its _blob hash_, which is a SHA-384 hash of the blob. Addressing blobs by their hashes protects against naming collisions and ensures that data cannot be accidentally or maliciously modified.
Blobs are encrypted using AES-256 in CBC mode and PKCS7 padding. In order to keep each encrypted blob at 2MiB max, a blob can hold at most 2097151 bytes (2MiB minus 1 byte) of plaintext data. The source code for the exact algorithm is available [here](https://github.com/lbryio/lbry.go/blob/master/stream/blob.go). The encryption key and initialization vector for each blob is stored as described below.
The smallest unit of data is called a _blob_. A blob is a chunk of data up to 2MiB in size. Each blob is indexed by its _blob hash_, which is a SHA-384 hash of the blob. Addressing blobs by their hashes protects against naming collisions and ensures that data cannot be accidentally or maliciously modified.
#### Streams
Multiple blobs are combined into a _stream_. A stream may be a book, a movie, a CAD file, etc. All content on the network is shared as streams. Every stream begins with the _manifest blob_, followed by one or more _content blobs_. The content blobs hold the actual content of the stream. The manifest blob contains information necessary to find the content blobs and decode them into a file. This includes the hashes of the content blobs, their order in the stream, and cryptographic material for decrypting them.
Content blobs are encrypted using AES-256 in CBC mode and PKCS7 padding. In order to keep each encrypted blob at 2MiB max, a blob can hold at most 2097151 bytes (2MiB minus 1 byte) of plaintext data. The source code for the exact algorithm is available [here](https://github.com/lbryio/lbry.go/blob/master/stream/blob.go). The encryption key and the initialization vectors for each blob are stored in the manifest blob.
The blob hash of the manifest blob is called the _stream hash_. It uniquely identifies each stream.
#### Manifest Contents
@ -844,7 +844,7 @@ UploadCheck asks the server whether blobs can be uploaded to it. For each hash i
Upload sends a blob to the server. If uploading many blobs, the client should use the UploadCheck request to check which blobs the server actually needs. This avoids needlessly uploading blobs that the server already has. If a client tries to upload too many blobs that the server does not want, the server may consider it a denial of service attack.
The protocol calls and message types are defined in detail [here](https://github.com/lbryio/lbry.go/blob/master/blobex/blobex.proto).
The protocol methods and message types are defined in detail [here](https://github.com/lbryio/lbry.go/blob/master/blobex/blobex.proto).