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 0x8cdaf38fc7311dcbd81417ecc18a55232a2718949fabf5bb2a7c15cd1ed0ad96. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/999194e7-3436-468d-93cd-8e626e3c2a52.json and https://artists.proofprofile.net/proofs/artist/999194e7-3436-468d-93cd-8e626e3c2a52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Inédito Español Del Siglo XIX, Vol. IV
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 0x17405769ba3248692096a349ff1f55360d92f10bd3f5dd2ed54b90e8a15a9da9. 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/ES24G1200200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d12600bd693916b963f9d4f1bb4a1afe89bba48537afeb526cdaa20188cf7f8. 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/ES24G1200206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358868169fa089e877c31ddf37aafa261e11faa355c68045cbc7240439aea63c. 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/ES24G1200166.
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 0xeadfdbfaf9233f0fb56fec40c2f937d33d6aff3065302192b325056693b1aeec. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ES24G1200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5903727a6f3b8c5883448befb19a95a347d6916d208af8770ebb5514cea98aaa. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES24G1200191.
Piano Inédito Español Del Siglo XIX, Vol. 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10074789498c713aea905626ec36f2fa07c7567a6d2514751a31d429bdfbda04. 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/ES24G1200229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8760ca67ab6fea90453b797404842521ec9ca69b2c2a4edb048bd512f303c2. 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/ES24G1200254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305469e2bb84710ebd4569304d6d260d3fd3f5591706398211a06d79d8b05b36. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES24G1200227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6788936860c5c27376b023cc21f751a41b0290cb043588c4755e80aef97d075. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES24G1200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51f8145f03843291f6610d64aa77e3aa6446aaf73166b3f574a016d263831f4. 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/ES24G1200234.
Piano Inédito Español Del Siglo XIX, Vol. III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d8736eb9c173690b8918ba2c85c5c80543ed21222d37379213e17c9820b662. 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/ES24G1200148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce2e94f1ed3f480bc5de0bb34769c43bcef05e6098e348f774640eb4a605d48. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ES24G1200129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0eb696f14efb4df409cac5ea4e21f77b32c47fdc61ea6dd407d7b42358f4dc. 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/ES24G1200132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebe2ee04bad05a344ae35d7413de0842839bf146545db1377bef4d1f8300033. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ES24G1200155.
Piano Inédito Español Del Siglo XIX, Vol. VI
Segunda pequena suite de valses cortos (II)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292395a1bab3b9fcb8704dd82590b2aa25582d6335d31c60a6fccdf6c5bd3406. 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/ES24G1200279.
Segunda pequena suite de valses cortos (V)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090377eabd779b4fc66b08602a69dcbbe9ef1d338837181a42135df06b67b6dc. 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/ES24G1200282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965b4646608a1cf63e65259291afaaa19c5edac6440deeddd1f52c61ce5721fc. 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/ES24G1200322.
Salón Romero. En Torno a Antonio Romero y Andía (1815-2015)
Nicolás Ledesma (1791-1883) - Masters of the 19th Century Spanish Piano Music
Piano Inédito Español del s. XIX y Principios del s. XX, Vol. 2
Bartolomé Pérez Casas: Su Obra para Clarinete y Piano