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 0x42b5fa4c4534b585b45dba99910781cfedf036beb330d5af2825558d90ab877c. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9cbe59c-73aa-4325-9d6e-bc27230a59b9.json and https://artists.proofprofile.net/proofs/artist/d9cbe59c-73aa-4325-9d6e-bc27230a59b9.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 0x1b13931a8ecb73d203920ace33151a2779e405199c7b5c4a3f3096b8b5731c73. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLF5R1500001.
Beste Zangers Seizoen 9 (Aflevering 5 - Hoofdartiest Jeroen van der Boom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21669e7441560be01fe0b9e07c3de20124fdcf7ecc7dc5b3353a0f331937599. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:00:57Z), 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/NLSU31600025.
Beste Zangers Seizoen 9 (Aflevering 4 - Hoofdartiest Willeke Alberti)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0929a2f2e16626b19beafc5d41d14f27f59af37bc2ac54cbae3b33d366693b9. 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/NLSU31600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b997ec72ccca288ba4ad145f72faa49a95002313500b25f46a43bfe5ce4fff. 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/NLSU31600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0929a2f2e16626b19beafc5d41d14f27f59af37bc2ac54cbae3b33d366693b9. 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/NLSU31600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21669e7441560be01fe0b9e07c3de20124fdcf7ecc7dc5b3353a0f331937599. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLSU31600025.
Beste Zangers Seizoen 9 (Aflevering 3 - Tribute to Jan Smit)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b997ec72ccca288ba4ad145f72faa49a95002313500b25f46a43bfe5ce4fff. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLSU31600017.
Beste Zangers Seizoen 9 (Aflevering 1 - Hoofdartiest Sharon Doorson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7415fe240d4013f2594760342ac27ced0aaae1d51a7671839df716a3302a66. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLSU31600002.
Beste Zangers Seizoen 9 (Aflevering 6 - Hoofdartiest Brownie Dutch)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bc7817675944d414fddb2b39eb27c458bd9810c84eee7b908c63682bf5197b. 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/NLSU31600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b997ec72ccca288ba4ad145f72faa49a95002313500b25f46a43bfe5ce4fff. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/NLSU31600017.
Doe Wat Ik Moet Doen (feat. Brownie Dutch)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e18bc61e4fb7b444b017df098ef42c6e406f5f8cd68335040b39445cf76873d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLMN21100015.
Beste Zangers Seizoen 9 (Aflevering 2 - Hoofdartiest O'G3NE)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41446ae71dc121409e57fa1cc51430c41594fe6f9d480221dcd2b6125dd53c0b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:48:24Z), 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/NLSU31600007.
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
Beste Zangers Seizoen 9 (Aflevering 7 - Hoofdartiest René van Kooten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb733c9e44a976ae453cb7ff5c69cf4b914b7b42b9aa11f7bf1ee840a788744df. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLSU31600038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc582614a5bba4e55b8c458b7b0fd96e2c8ec58e5cb576bfe5b2da8e3b464db69. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLSU31600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f61748080eb0c9f511ca1bdbeff0b08b051e64201aa0c357271eb8c921895c. 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/NL1JC2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57e888284d3cfe706e8141b741542aaff473703a648ddebe8375da0f5e2db99. 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/NL1JC2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803de69b8cee9af12d47a66449e47d38c9fa6e360ae4d4a42892c922dc9d67c7. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NL1JC2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e236f0123d2579437cd67cf22e33fa1dd517014d29406ccea7c520df98fa55. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLMN21100012.