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 0x0a9fc5d51fda05ff6d5b52f2c9a38c6cee32872b6034e6f2a658eba18485ee43. 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/6c59b8b9-5949-473c-8e83-ac6faa4a668c.json and https://artists.proofprofile.net/proofs/artist/6c59b8b9-5949-473c-8e83-ac6faa4a668c.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 0xb1cf5e74237e26e2a242ea066ad026f3e099c0cbf99b9bdae06447b491df788c. 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/NOPTP2301020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16e473e9feb77e9048c025d184d98bc4585c6bed77dc882f2ce1b7c32d254ea. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOFGG1905080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2034b39e4693c29858263d7781257888d661e2fa574c03ae344a6a79734c1990. 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/NOPTP2301130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08684a4fddd23bcfcbf4f24c0b269a4d661cfca7b65f6e4162ac592070898534. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOAGW2000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d2ff4e7c5b4f9422cf96c62c926bb1e77aee1ab44a11e23fd23bbe08ab303d. 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/NOEIA2008050.
Møtested - en hyllest til Anne Grete Preus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142671d4e56f803bb5b76ed44ae4bd5c80b842cef2d6e344fbfdd4377f88a075. 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/NOAGJ2300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9096c8873b4cbb93f5bfafb3438ec758a98ba58a472b7f7e6e13da5eaa4f8226. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/NO2SI1701010.
Crescendo i Gågata - En hyllest til Lillebjørn Nilsen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475451d4aeaea3afbe27af5ac8ea898b2900143f3fce2c9033e057f0e0136e9c. 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/NOFGG2040010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3a1044379cf031a41337df4d666d26daddfcadbfb86ee4141ea2f0c0acdefc. 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/NOUM71800251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a343a63a70093af898aca0ef4b700b59a92cede0976243d67e4d4e2e117cb0. 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/NOUM71700217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a343a63a70093af898aca0ef4b700b59a92cede0976243d67e4d4e2e117cb0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NOUM71700217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939afe8d0aa83b6a693e7f12c596e3695cf7453d7876c68e719bcf43e175bfae. 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/NOAGW2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4edfbfd8992a856403bee4a7efa94d5c72b6fed44a370b70a29b1a9efb22b2a. 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/NOEIA2001010.
Vi Har Den Ære - En Hyllest Til Thorbjørn Egner
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395912a9427e07e8925b24d0d181321a9af1913416a1b3dc0c04bd0f0252a78a. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/NOHMA1255070.
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.