thumb|The Trave in Lübeck The Trave () is a river in Schleswig-Holstein, Germany. It is approximately long, running from its source near the village of Gießelrade in Ostholstein to Travemünde, where
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 0x91cbb41ed86fb0836b0ce77f5e289b51ae4b4cb919980684d0ddf0744aebabeb. 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/ecf21f57-866c-4f30-960c-e9b255bf08ec.json and https://artists.proofprofile.net/proofs/artist/ecf21f57-866c-4f30-960c-e9b255bf08ec.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 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 0x39f4b62bc85fc332f0c6f497edb9d5c74bdc7cfb7125c0b26c761237af6276e6. 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/ES47E2008097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4fa26ecd721f0a2ba19d012ef03af8fd23e1563e6ab9ddc2a92f71d5bf1c86e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES47E2008983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32fc53caf83202c7d5f4d78dfcb55a454dbed0ac4173f6b78c9199d38609400. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES75E2202544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041513e823d9302cef22845c4634f0aca1fc86a308fff5989bc1475e95607977. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/BK4DA2301819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7a05b42758dd8be345b2831af690e6284fe46bb654087061e16f5b9c4486a3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QMFME2337451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31368f883ed7e8f925227b1c6b7463a74ef36f01418b3883dedb8f4f6af42763. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES75E2305982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3048f3890ebb0de8d0dd657a312d207d0cf493c6c2b66a900ff894d1793b12f. 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/ES47E2003226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e87149036d9b19eaf073ad86e248f35765dcad0199233f54e2fe8527bee616e. 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/ESA011748913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93261de6874151eae73c9894daa643ad1a0dc5bce612e70ebef938984d6ec31. 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/ES75E2305337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e347de3cc4dc73adc0aaad06d6a43f706aa3d3c51d9d9917e216651109a4972. 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/ES5022400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576a3d016dbd2994f802e0c7b0fabff0e9ccd4466cfaad470d28e6fa8cbfd472. 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/ES64E2483826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae418d073a914f27f6e647983573606f1ba251418575ceb6b1639d4014d8ee16. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BK4DA2421432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae418d073a914f27f6e647983573606f1ba251418575ceb6b1639d4014d8ee16. 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/BK4DA2421432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597525aa2ce0dfa6d1078eff68e17e17e055b41b597646d3293bb6088c24d364. 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/BK4DA2413848.