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 0xe68b1bcb2b5de795f867bf5425b4cc8a4e8fa737cd638866b67fbb8488b8b0dc. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c64c87c0-3853-460f-888e-16d3224f644f.json and https://artists.proofprofile.net/proofs/artist/c64c87c0-3853-460f-888e-16d3224f644f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Return To Sorrento - Italian Songs Arranged for Trombone
Torna a Surriento (Come Back to Sorrento) (arr. for trombone)
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 0xa02b628c58d543a27be356246ed9bd670d608c3e2a468d3dd91f3e52a966d91e. 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/HKI190629901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcc2fcd67d3ad483c7a230a09f90bd1882186c36941bcea31f768f4275557bb. 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/HKI190629902.
Turandot, Act III: Nessun dorma (arr. for trombone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda8ecf8e9e4c23893faf72da1a16350ae881845177c94a5c4897e81d198720d. 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/HKI190629904.
Les soirees musicales: No. 8. La danza, "Tarantella napoletana" (arr. for trombone and brass quintet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2652cefcb40f47353905734e05d42ffe7d29f25fd930e743937600a92b6fc7. 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/HKI190629906.
La boheme, Act II: Quando m'en vo' soletta, "Musetta's Waltz" (arr. for trombone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845d29e2d782dd12f26daf0678a4a62e9dab6c0cebd90ba1a5e322435fbd033c. 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/HKI190629908.
Arrivederci Roma (arr. for trombone and big band)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9629ac3f6b84c243e6c47ece38da626e059a39ea270b84c4dd4b218db709e02a. 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/HKI190629916.