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 0x349300df158b44c2e2365aca5010745f17c151983ba806dbd2cba55cf146ba1c. 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/b220f58a-0257-4dbb-aa73-de20be06b940.json and https://artists.proofprofile.net/proofs/artist/b220f58a-0257-4dbb-aa73-de20be06b940.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 0x325645f5f3f8a8b2c368f3b3845fa29c4c2f9fa0c589952693e7fc38c18ef977. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HRAA41600456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c847e14a5e581eb8ceedbbaa6fd8bfee1ddff342ac1ff6b65a4d82fc0f8381. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HRAA41300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491862a0940a0128b023825cce5b26e4bfc3b77bd1285f1c48c04c9467fd64a9. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/HRA4R1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2132d78529885b01bde2b9fb33a4e0576dbcc661e1142407b0af24622b0e8c94. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/HRAA41800150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839316fcb9bf4903a913283fdc45fe698ccd9345030a6440f927a2c4f2eff75c. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/HRA4R2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb2a38ae0463fb30875d64203dfd9c558eb3f85d5f374bc56c3833fa0cdd895. 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/HRA4R2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc67b0e920be12a89b3f15ddd9fff1f01d9b1f511d96478ee8201481f8d2737. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/HRA4R2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e57654f151183cb9af16b85b011bd675f1e21c4b1fa005b91a706c4c15ccf9. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/HRA4R2200001.
Croatian Football Songs 2022: Best of Zaprešić Boys
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10354dc40914e57ee3596e002e77f1af8184929deca816801d9f09c30286d93a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HRA4R2300001.
Neopisivo (Shalla & Rols Roks Remix Ext)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666446ddd5b62fe3f0e064cefeea931d1c54f195b61b5b0e65506188b44ddf67. 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/HRA4R2500003.