LOS, or Los, or LoS may refer to: Science and technology Length of stay, the duration of a single episode of hospitalisation Level of service, a measure used by traffic engineers Level of signific
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a15269b0455d0f82970f1c831b458ec2f73c0e3344dddd66a5fb0568f9c6bfb. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a492a6a0-2798-4181-be63-d7d93b426e20.json and https://artists.proofprofile.net/proofs/artist/a492a6a0-2798-4181-be63-d7d93b426e20.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bedec2c88aeb6cd5e0c90f06166885be0f40c6eba72f3c5a975221763451c3. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:51:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1193336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6987db4e7c93a7e57d5f14ff5628122ad8cb343ba98ccdd6f75cf8b481f4de51. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1315766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861d19a309f38b84898f0c969b7a57e45422acf4b53f43955431225430b59dd6. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1315771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4640eedd778d3f2ac3a911a17543dac32b368711296350533555fb0ddefeab. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-16T00:31:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1376555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e2914fa2a5f9c5badef419b1dc833bb4172b5f1efb43828badb8802ce86501. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1416622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c35d8a095c3747fd6fceb7a2fa40001156afdd1fd2c1560a86ecaa72081f9f. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1545751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87e4304b0c0df4d8d382e091cbcf8c3bdb9d38260be8e6c6607073b93f821e1. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1582216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137ddf404e2340aa1887335fc7626ec542af5741c43b7818e5102715456d8db7. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T16:59:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1582217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25763cd0ffd3056bc4433f88ddcab71ad3ad44ba55b49aafbf1225d2f814538c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1577600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc7af442c531c8fb3659f3582df3497b6217e15cb7b6942005a38f60593162c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:27:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1582219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3dee4e53f0718c42e3ba75105976b8f14d7de14592d7fa3a43aab3723c301a4. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1582222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc406351e5495a59af9fabd131cba41b3f13b702eed50d1e7f90eeb739615cd1c. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1582226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf9a08a3592ae3cd4532f70e6285773ab37ce4355e08f07167f6f490edc09ec. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACK1563416.
Can't Even Talk (feat. Dolla Dame, Los & WB Nutty)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a696444b800b66c8c1f5b6dd9b675b828881f98e26277518436a30ec5489a8b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1441829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3239e53c2fb4017a23a7d2fa67d1f2011cf2520d742cb827f63c0cf5c0476850. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR5R00905833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1243fe22aa9f17f691ca77da28eab97bed942b395c7674a7fc56afdf028c4e4f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USQY50940956.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb632bdbc57071749973f554769b4760e30a6548a2a37e7388c2ec8978bf420. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USQY50940959.