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 0x0f41ce0c3be8b55450f3f7f6fc3c3ba7dd0b9f4b2bdf80513742c85a90becdb3. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79dd26ae-548d-43e4-9e07-466bfcc09ded.json and https://artists.proofprofile.net/proofs/artist/79dd26ae-548d-43e4-9e07-466bfcc09ded.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vrolijke Christelijke Kinderliedjes, Vol. 17: Vandaag = Nieuw
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 0x1d0d0d76afa7f08d46afe40e271d6777593b4e161cb63a8ae9498571acfc92d5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBKPL0924793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf5ff748373a555386887fc6152a4197db1ca50faa0721b53eebed246e3f324. 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/GBKPL0924797.
Vrolijke Christelijke Kinderliedjes, Vol. 4: Kerst = Feest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03fb68eef3c8ec865a022d508af683c1f3b097f3eda8d9d121346c4f6edd6d2. 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/NLL152203564.
Vrolijke Christelijke Kinderliedjes, Vol. 7: Geloven = Gaaf
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b99478f7f103b6ef42c9422f1b4eb833b5195f38de825e2be20deac5c04056. 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/NLL152203473.
Vrolijke Christelijke Kinderliedjes, Vol. 6: Zingen = Leuk
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f8ee182f7cf5995202627e87877843d1c6ec3f3817a37c9e6fd24343aa96b8. 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/NLL152203648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2504e10ad27fdcc336e2568833d5ff5fa6524e0b4ac7a607d62518a45c76b9. 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/NLL152203651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1770a6ed2e72bcc76affa50289fb251bad3016b89c505566160ff50889b1eb3. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:09:52Z), 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/GBKPL0924710.
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 0x97ff8968ab3e0f1eacf61ed3044d47cd808f23e9ae97d9cc8457de425a68debe. 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/GBKPL0924709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0650604c48960adc4dde907807c79845759c4c61ad3bea6b157bfb991326e99f. 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/NLL152203551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea84311fe95846a50689a4a8bdfde31902696eebc75643af88aa63f1cc40ba8. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLL152203557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b9a36bdd7459b4f2e7dbe569ef5b52c14052d9c3cf064ebf2ed080d23d8d67. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NLL152203561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9eff63813fc66014342e2b8febe8f02a552a15e69554fe59e646199940b574d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLL152203468.