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 0x5fa56f56590e963ccffc4e3b1391842b45f0630ef308b049b5180ac21727dac9. Chain 2 (Bitcoin): anchored in block 954069 (2026-06-17T08:30:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/795b2dec-a5b6-4ec6-98e5-e373a48a0b63.json and https://artists.proofprofile.net/proofs/artist/795b2dec-a5b6-4ec6-98e5-e373a48a0b63.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 0x62f2641e5510fc02415cccf149cd98546a890a3946dd9c0271b2b4a68fd65956. 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/NLA460710469.
Cinco Piezas: II. Romántico. Moderato ad libitum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b0c174e5165a1342bc85e3492c30c5e05fe18e95f2ec52d662346831d49eac. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NLA460710470.
Cinco Piezas: III. Acentuado. Ritmico, molto accentuato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568643fda51b86667e9818ff34107668af074f15ff6ff45ea2f9a18edd7f5c05. 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/NLA460710471.
Cinco Piezas: IV. Tristón. Moderato molto cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba11a69608994178b11cdb5088a031d3e17bac9330babcf0e08da298353e1cd5. 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/NLA460710472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b695609aeff5487c35ce22d4a7cc7e71dd0eeba8170e4d9ba059feb7d5bf59. 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/NLA460710473.
Contrabajeando (Arr. for Solo Guitar by Baltazar Benítez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83f9935511ddcbd186290c1b683dfeeb0dd0dd10a73eb78e45f6d7bbe3c3bd9. 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/NLA460710474.
Suite del Ángel: II. Milonga del Ángel (Arr. for Solo Guitar by Baltazar Benítez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ada7b3a38f461d369766466f542b823d29db55bd2b3782fcf450583662d4e48. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLA460710475.
Suite del Ángel: III. La Muerte del Ángel (Arr. for Solo Guitar by Baltazar Benítez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c7d6ce4b88b2680ee8c180e71bd09db1dc6275c85e77510888eb0f62ac5931. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLA460710476.
Cuatro Estaciones Porteñas: IV. Verano Porteño (Arr. for Solo Guitar by Baltazar Benítez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf200b9ca3b0d3ad3e42bf53ca35c2adff7d05a9275fdcc33f61a399a49ebcdc. 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/NLA460710477.
Cuatro Estaciones Porteñas: III. Primavera Porteña (Arr. for Solo Guitar by Baltazar Benítez)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265e7175848932c1ccebacc4d842117c597b14a5d600085b141e8b1bae45649c. 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/NLA460710478.
Latin American Music for the Classical Guitar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413e3c52d7d3522b3260ade4f2855c668211a9f45b7499ebcfb581586c702a41. 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/USKC61923101.
Estrada branca (Arr. P. Bellinati for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b15b9145ca1f43bb949279429d2be78ed2688f8afdd6e7f6cd1d94fb391c81a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USKC61923102.
Introduction & Variations on a Theme by Mozart, Op. 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c20eda9ae266fe59aa51a3ec4ddde5a60189576fa5029835d14aa306a980c5f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USKC61923103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eda455c813ad737aa2321d4939c4c89ebce5b4dd680e52049a8fa3fbb18994d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USKC61923123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8143b1eead0697132363cb80afb23a581afd9468d74ada90c1dea0100e7cfe52. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DED731300305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828967cb03a9036348a440a2251d311cb166afc3f6f124280615f04d8c38bbb4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DED731300307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab436ffa980509d8c31040dc110a77b3ad8704d6f75f7354edc775dbfab4602c. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USB8U1029331.