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 0x626039d88f548b0d884ecbc7e0dfbde9eb9b1ff6b8fdb22e0e86232891bf12ae. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/adeb6722-aeb2-4234-a8c7-b1ac29ff4460.json and https://artists.proofprofile.net/proofs/artist/adeb6722-aeb2-4234-a8c7-b1ac29ff4460.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Debussy: Children's Corner, L. 113: No. 4, The snow is dancing
Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter): II. Seguidilla
Falla: Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter)
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 0x98c7ad10795e6f309f1f5237d25d42e42310aa6b48edaceb974ae84171150173. 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/CHE272402361.
Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter): III. Asturiana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b2d614c1739e3b5d39dc882ce49c7761e7a7ed6d2b5c37c85c3909a87ad281. 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/CHE272402362.
Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter): V. Nana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb233189d39e14bf368c7e6f55013637cf485e7871120a8e74538231dcf92b0d2. 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/CHE272402364.
Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter): VI. Canción
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04c1beca066c60bf931847cdbca28caaaf0af83e7c109e48376a2e7db73856f. 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/CHE272402365.
Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter): I. El paño moruno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1166c5b794817d9b35f689b3a959b82095510a00e78a064255c592b3221afdd4. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CHE272402360.
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
Siete canciones populares españolas (Arr. for Piano by Ernesto Halffter): IV. Jota
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e1d0972f7b8d480e308d4fea18a4745b43fa14ccfb4a1abd6082edb81b474b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CHE272402363.