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 0x79c799c1f23ac6e1223941ff663d9c72f33e3edef816ee7cb9e2bf2569d86ef0. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8723f10-dea4-46e8-bab9-f896e289a4e9.json and https://artists.proofprofile.net/proofs/artist/b8723f10-dea4-46e8-bab9-f896e289a4e9.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 0x63f3de082f78fd7ea97b09b9bf32d45a88e880fd59eacc5f27c28dee2bafc253. 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/NOHCM1601090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41909d033e1c7e80bbbe4a041aa7674231a6e23428ba19af399ee69edcc6de1c. 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/NOHCM1503010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e63e0926001ea581d80f865ebde20f92a09dee681520b5c293477451b0c059. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NOHCM1503030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572541612b63163086fe3b13aa7d3e92cb2d7bbec872ce0228bacabb457c4e84. 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/NOHCM1201010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6caa1823a3ec6b52f763c16a08363165e8a27d0271ac5dd8b053d488651d62. 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/NOHCM1201020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f72e35815a3806dbaecd1f5c41c0f5ac8354181a6d5552794537dc75bf51389. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NOHCM1201200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51263af2ae983ee154fe0681b9c400f17904f00f9fb3d9ee92fdf3fdc7b05f27. 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/QZMEQ2359569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69709f811a0f8808a84d3b15c92b9ec288d05a644c4c739e6dda64707df0a18. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZMEQ2359570.
Bruremarsj fra Vestfold ("Norwegian Wedding March from Vestfold")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f17b467e209852190600204475fb4f6a7af9562354edcdd7d3ef73416ec0dd9. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZMEQ2359571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6aaa22ee4a833b0699e27dc311db3f11bd30521cce4a9e0556e61e572b5e3d. 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/NOB942200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11bf60bd1cbc18ccef7e886e8aabee997288574ecce4cbb68b580a2cc9a2109. 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/NOB942200390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe619253a751a8b6c679b8b310b28d81b1430dd57784f721795806201d6768b93. 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/NOB942200430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccc05d379f8392103383a233924ad42ad8d1d6426ed345d5ec81291a49b0501. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NOB942200240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7744f02574bd7d2e5cc35ac3b4d76497a9235d7f62b2b97393bee24a41e9e1f0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NOB942200560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faa11de8c8690d1b1bb42579b5e2bde557fbfd6a91a073b9a873c4e68017511. 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/NOB942200730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcb4bad619ae1fda3cafab25bd7e389a17eab32cb4d9aa3d85853515d55e06c. 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/NOB942200050.