thumb|The Bagad Kemper with Dan Ar Braz for the Heritage des Celtes anniversary in Quimper. Bagad Kemper (using the Breton name for the town of Quimper) is one of the oldest bagad, Breton pipe bands.
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 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 0x208473be0cbc95765e364b18b7704a9d06c01469236fbcc7a525d9209ec30ca2. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71bbe2d1-90c9-44c4-a499-cfd20a095429.json and https://artists.proofprofile.net/proofs/artist/71bbe2d1-90c9-44c4-a499-cfd20a095429.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bagad Kemper Kevrenn et Bagad (Mono Version)
Hep Diskrog (Breton Pipe Band - Celtic Music from Brittany - Keltia Musique - Bretagne)
Sud ar Su (Breton Pipe Band - Celtic Music from Brittany - Keltia Musique - Bretagne)
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 0xf5abeb18e162dd9f0d86d9ba1c80440b604a3042bf2940c8a473b6c59142884c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/FRY470415110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9ee71c96caa722949c3645ba4028899ee179e04eb7914beef71d8ffe4757b6. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/FRY471052005.
Toniou War An Dachenn IV (Breton Pipe Band - Celtic music from Brittany -Keltia Musique - Bretagne)
Best Of (Breton Pipe Band - Celtic Music from Brittany -Keltia Musique - Bretagne)
Lip ar maout (Breton Pipe Band - Celtic Music from Brittany -Keltia Musique - Bretagne)
Fest Rock (Celtic music from Brittany - Keltia Musique)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a35e9288a89e0004374f53f517da21697c8871cefeb502cf43c7c5cfaf056d9. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FRY471355702.
Azeliz Iza (Breton Pipe Band - Celtic Music from Brittany - Keltia Musique - Bretagne)
Collection (Breton Pipe Band - Celtic Music from Brittany -Keltia Musique - Bretagne)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940150d8026fc98f6b825c1fe9fdb9be212f181673d3fa4f27fd26239ce5c854. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/FRY470617409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0e24b2544e8b62332253fc9cc24565f70e743956f8e2e3985beea89ec9fbcc. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/FRY470617411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc63192b1a0cb5a501d21a9a49ebd751aed4982580ebafb5a10fd84653e27f89. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX611900240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc8a497f60db4b64667c79789d8522b59b820cc87633e2cc1b3ee99da77a94d. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/FRX611900241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7798145e771566307990b64675be50c7de74dd8c37e308f75ef188b78ae1cbd. 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/FRX611900242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f306ff598bf5d14b47d656f45e6af1b67ff706497694c1faaa43de990f3ff0a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX611900243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d9161a02a3177f2f9fb63f0863ef9b740eceecf7d479c20045e39b70bfde93. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX611900244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a5a3c9db421b690680b309b51df92d138f7f54619d387880095a074fafbfcc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRX611900246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c3d9a1c47089b7e3c64118749c52da45fb2c43ab36335a3993ecb9395e665d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRX611900247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda01c889d163e3258b59e9fbf29cfc8824e21660f1309585088a130cb8510e2a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FRY471360906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad16e1019cc8359f8a320a354b207012160da9f3402b7f9f66c15d890470ffe. 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/FRX611400049.