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 0xb5d1078651e521010a2bb06f155fa34daba2879c4a5a7da72d6973ca5d3f83eb. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d32dbd9-e1c4-463c-83d0-c5cb10f78719.json and https://artists.proofprofile.net/proofs/artist/1d32dbd9-e1c4-463c-83d0-c5cb10f78719.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cantigas de Santa Maria, IA 1 (Excerpts): No. 422, Madre de Déus, óra por nós téu Fill' essa hóra
Alfonso X El Sabio: Cantigas de Santa Maria, IA 1
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 0xc8e1a103357e8a8a9153c76d1c004ca93cdb439c3d827553bc3c9b62b83d493d. 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/PLB352128503.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 260, Dized', ai trobadores
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207190b89cc1d9247ccbeaf4d2decd81ee8109fa8efc60de55efa4ed3bdf6196. 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/PLB352128504.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 258, Aquela que a séu Fillo viu cinque mil avondar hómees
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092c1d77473b1b13d0a25a43a3de92d163b1589ea9b2d074104dd2e194a5f980. 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/PLB352128505.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 425, Alegría, alegría façamos ja todavía
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1396d63f9b3d2922e3cf07821764a771825bbcf81ca0a3bee63409ea71e63814. 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/PLB352128506.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 323, Ontre toda-las vertudes que aa Virgen son dadas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9af4f2a70010a2e8c238405cc58ff0b8aa6dbf16cfdc64fc939c66ff2eb09b. 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/PLB352128507.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 79, Ai, Santa María, quen se per vós guía
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63909b645471c21635a2c6a08a5b8b40dd1f027d9bda57d11dcba8fa8ceca88b. 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/PLB352128510.
Cantigas de Santa Maria, IA 1 (Excerpts): Prologue B, Porque trobar é cousa en que jaz entendimento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447849cb617a221e7a44e672f4142c3065e36436f8562d3bbccabc1de35945f4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PLB352128501.
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
Cantigas de Santa Maria, IA 1 (Excerpts): No. 166, Como póden per sas culpas os hómes seer contreitos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e6bce1b7a6201afd2d27adc38ef5915680f7479385f7e4ddb5e1d093306b8d. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/PLB352128502.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 7, Santa María amar devemos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fc1b97beee40683a3fdee37f89f19bd1094a838a766bb6d25756a40d5622c9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PLB352128508.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 37, Miragres fremosos faz por nós Santa María
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8205f2ff272ce6495b987dbdebac60eaf40187252d1c065d3837abc62da175a7. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/PLB352128509.
Cantigas de Santa Maria, IA 1 (Excerpts): No. 10, Rósa das rósas e Fror das frores
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fe5407efb66a40cbfe2a6c01cdae7163ba8feb99f766f0818dadfd782c2cc8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/PLB352128511.