2018-08-24 00:33:59 +02:00
# Signing a claim
2018-07-13 20:03:21 +02:00
Reilly wants to publish _Terror on the Midway_ to the channel he claimed `lbry://@FleischerSuperman` . He picks the name "terroronthemidway", and fills in the information for the claim:
{
"claimType": "streamType",
"stream": {
"metadata": {
"author": "Paramount Pictures",
"description": "The episode in the series of Fleischer Studios-produced Superman serials. Subsequent episodes were produced by Famous Studios.",
"language": "en",
"license": "Public Domain",
"licenseUrl": "",
"nsfw": false,
"preview": "",
"thumbnail": "https://s3.amazonaws.com/files.lbry.io/thumbnails/superman1940-thumb.png",
"title": "Terror on the Midway - Superman Ep 9",
"version": "_0_1_0"
},
"source": {
"contentType": "video/mp4",
"source": "9b70337f51fe9a4481504059b4220ad4f87378d59ecc87bd924c3f0f23da9442b9f75ffc091b65deefe92477a86a31ea",
"sourceType": "lbry_sd_hash",
"version": "_0_0_1"
},
"version": "_0_0_1"
},
"version": "_0_0_1"
}
This is serialized as:
080110011ae6020801129e02080410011a24546572726f72206f6e20746865204d6964776179202d2053757065726d616e2045702039227f54686520657069736f6
46520696e2074686520736572696573206f6620466c656973636865722053747564696f732d70726f64756365642053757065726d616e2073657269616c732e2053
756273657175656e7420657069736f64657320776572652070726f64756365642062792046616d6f7573202053747564696f732e2a12506172616d6f756e7420506
9637475726573320d5075626c696320446f6d61696e38004a4868747470733a2f2f73332e616d617a6f6e6177732e636f6d2f66696c65732e6c6272792e696f2f74
68756d626e61696c732f73757065726d616e313934302d7468756d622e706e6752005a001a41080110011a309b70337f51fe9a4481504059b4220ad4f87378d59ec
c87bd924c3f0f23da9442b9f75ffc091b65deefe92477a86a31ea2209766964656f2f6d7034
To publish the uri `lbry://@FleischerSuperman/terroronthemidway` , Reilly must sign the SHA256 of the the combined claim address, claim value, and certificate claim id.
He starts by generating an address for the new name claim:
bEGGwBFf39ek6ASJV5YwiUPvDqtpgczCVZ
His claim for the certificate at the uri `lbry://@FleischerSuperman` has a `claim_id` of
2996b9a087c18456402b57cba6085b2a8fcc136d
It contains a der-encoded SECP256k1 public key
{
"certificate": {
"keyType": "SECP256k1",
"publicKey": "3056301006072a8648ce3d020106052b8104000a03420004180488ffcb3d1825af538b0b952f0eba6933faa6d8229609ac0aeadfdbcf49
c59363aa5d77ff2b7ff06cddc07116b335a4a0849b1b524a4a69d908d69f1bcebb",
"version": "_0_0_1"
}
### Signing the claim in detail
Reilly decodes and combines the claim address, the serialized claim value, and the claim id of
the certificate claim. As hex, the combined value is:
5510d538a8ea31210a2a65cfcdd985e3e7bbc42e7c2cecb7bc080110011ae6020801129e02080410011a24546572726f72206f6e20746865204d696477617920
2d2053757065726d616e2045702039227f54686520657069736f646520696e2074686520736572696573206f6620466c656973636865722053747564696f732d
70726f64756365642053757065726d616e2073657269616c732e2053756273657175656e7420657069736f64657320776572652070726f647563656420627920
46616d6f7573202053747564696f732e2a12506172616d6f756e74205069637475726573320d5075626c696320446f6d61696e38004a4868747470733a2f2f73
332e616d617a6f6e6177732e636f6d2f66696c65732e6c6272792e696f2f7468756d626e61696c732f73757065726d616e313934302d7468756d622e706e6752
005a001a41080110011a309b70337f51fe9a4481504059b4220ad4f87378d59ecc87bd924c3f0f23da9442b9f75ffc091b65deefe92477a86a31ea2209766964
656f2f6d70342996b9a087c18456402b57cba6085b2a8fcc136d
Then he takes the sha256 of the combined string, giving:
dea44974ace1893f304cae4073af06a7a6cbb209f97cf8ad5f322216f044304e
He signs (RFC 6979) this hash using the private key to the previously shown certificate, giving the signature:
bf82d53143155bb0cac1fd3d917c000322244b5ad17e7865124db2ed33812ea66c9b0c3f390a65a9e2d452e315e91ae695642847d88e90348ef3c1fa283a36a8
Now he add this signature to the claim:
{
"claimType": "streamType",
"publisherSignature": {
"certificateId": "2996b9a087c18456402b57cba6085b2a8fcc136d",
"signature": "bf82d53143155bb0cac1fd3d917c000322244b5ad17e7865124db2ed33812ea66c9b0c3f390a65a9e2d452e315e91ae695642847d88e90348ef3c1fa283a36a8",
"signatureType": "SECP256k1",
"version": "_0_0_1"
},
"stream": {
"metadata": {
"author": "Paramount Pictures",
"description": "The episode in the series of Fleischer Studios-produced Superman serials. Subsequent episodes were produced by Famous Studios.",
"language": "en",
"license": "Public Domain",
"licenseUrl": "",
"nsfw": false,
"preview": "",
"thumbnail": "https://s3.amazonaws.com/files.lbry.io/thumbnails/superman1940-thumb.png",
"title": "Terror on the Midway - Superman Ep 9",
"version": "_0_1_0"
},
"source": {
"contentType": "video/mp4",
"source": "9b70337f51fe9a4481504059b4220ad4f87378d59ecc87bd924c3f0f23da9442b9f75ffc091b65deefe92477a86a31ea",
"sourceType": "lbry_sd_hash",
"version": "_0_0_1"
},
"version": "_0_0_1"
},
"version": "_0_0_1"
}
Serialized, the signed claim is represented as:
080110011ae6020801129e02080410011a24546572726f72206f6e20746865204d6964776179202d2053757065726d616e2045702039227f5468652065706973
6f646520696e2074686520736572696573206f6620466c656973636865722053747564696f732d70726f64756365642053757065726d616e2073657269616c73
2e2053756273657175656e7420657069736f64657320776572652070726f64756365642062792046616d6f7573202053747564696f732e2a12506172616d6f75
6e74205069637475726573320d5075626c696320446f6d61696e38004a4868747470733a2f2f73332e616d617a6f6e6177732e636f6d2f66696c65732e6c6272
792e696f2f7468756d626e61696c732f73757065726d616e313934302d7468756d622e706e6752005a001a41080110011a309b70337f51fe9a4481504059b422
0ad4f87378d59ecc87bd924c3f0f23da9442b9f75ffc091b65deefe92477a86a31ea2209766964656f2f6d70342a5c080110031a40bf82d53143155bb0cac1fd
3d917c000322244b5ad17e7865124db2ed33812ea66c9b0c3f390a65a9e2d452e315e91ae695642847d88e90348ef3c1fa283a36a822142996b9a087c1845640
2b57cba6085b2a8fcc136d
Now he can put this value in a claim transaction, and broadcast the claim!
So long as his certificate claim is winning, his publication can be resolved by `lbry://@FleischerSuperman/terroronthemidway`
Even if his name is outbid, the publication can be resolved by the channel claim id at the uri: `lbry://@FleischerSuperman#2996b9a087c18456402b57cba6085b2a8fcc136d/terroronthemidway`
