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 0xdd0fefbadece47cf87050b68064548375503d4cb354cf3171774c0ba9ef0ca96. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/915ba8ed-59e7-4c76-a2c3-410a62f3c637.json and https://artists.proofprofile.net/proofs/artist/915ba8ed-59e7-4c76-a2c3-410a62f3c637.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Granaïna del tio Palero (del poble de Montaverner)
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 0xa1890b3aabb210a9e0f1297ea9656c7ff2dff11158bfa92a7e36017fc0a2eb5d. 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/QMFME2069699.
El casamiento de Maria la Xapa (del poble de Sueca)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48b874a43a1e64750bf5aa6ffbf3d49b3d7de56c193a9d334e2c8e91b1ff652. 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/QMFME2069700.
Dotze i U de la tia Rosario (del poble de Canals)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5268e750971340c2090d190b2b92ca4cdf6519b24b23a616e47f3f4740786da9. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QMFME2069701.
Jotes de quintos i de ronda (dels pobles de Canals i Vallada)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17229da7e62bfb9e9a16d005cd108a3a898a91c435fe6fcd41025f0969c75287. 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/QMFME2069702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd574881df0bc9dd8164e8aa94692cbe4fbfe8a2229b9a5cb9edc7d8cbe1371a5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMFME2069703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6856dba182d723297fa31cdf9c1d9421545a49cb74cd93766d76d62a031793. 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/QMFME2069704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c638eeaffb38d0b740cde741b6971b0369d5c37e9e010da197e5ea24dd6d48d. 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/QMFME2069705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd8948fa823403a4c021af390f55bd550f9719c9d943ca9825bcc885e30a777. 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/QMFME2069706.
Ni Paga Ni Nega (Romanç del poble de Senyera)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b53f49e68106bcc4d4620f1e3dd9ca3dc1e3e360f1a0020b0705901db195ed2. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMFME2069707.
Els Vetlatoris (dels pobles de Xàtiva i la Llosa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee409974156ceb635bfaaa760edf8196cc8aab9caf68e9aa26b5ac44d2abd061. 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/QMFME2069708.
Malaguenya De La Tia Emilieta (del poble de Barxeta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a881e80e982b1bd70bd4a6a9ad30ee35f33f36b74aef264a82cc3eda08e7ddd. 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/QMFME2069709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b9cddcd06d78cc6c26a31478f8649c072ae1893cc8469144c9c9c7a250c33d. 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/QMFME2069710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa824a1caea6cff065bfab8cc792264afad7116c6c0348678043f93b2b1184c. 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/QMFME2069711.
Dotze i U de la tia Rosario (del poble de Canals) - Instrumental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0a4907ce4622f7fd19c281aacc7174f26956966b68564280e6997a86fda9c9. 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/QMFME2069712.