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 0x799a2ae098d192847cdc9b7d0013fad0134b23f0820ce51f445ed3cfe528029c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbda36b3-b913-4047-ada8-2f83876590d1.json and https://artists.proofprofile.net/proofs/artist/bbda36b3-b913-4047-ada8-2f83876590d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Arnold, Bacri, Chevreuille, Horovitz, Martinu, Poot & Sancan: Sonatinas for Clarinet & Piano
Sonatina for Clarinet and Piano: I. Allegro con brio
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 0xc620c3c6d50523ef4061a4e75746025aae2042ea783dad802b16c60357f35561. 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/BER180955801.
Sonatina for Clarinet and Piano: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64280e6074ca2a7be9d71ee2f3be3daa7ea47a4a8a36916268c27d9312c27d8. 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/BER180955802.
Sonatina for Clarinet and Piano: III. Furioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3bc72f000db49658decd022289c3dd8e6d3d7142e32546f900800802688583. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BER180955803.
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
Sonatina pour clarinette et piano: I. Moderato - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c53010bca494b1840b810e3387acc4535013bc6c24d17680f4e5e9e3a83294. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BER180955804.
Siete Canciones populares Españolas: III. Asturiana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105a376c650f4cfa6e33f768074a6e1107f0d3296f22911ccf7e38a9668f8af2. 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/CHE272200872.
Märchenbilder, Op. 113: I. Nicht schnell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4312ac241840dbe150fb6f54712b002447a88a6a8c2ea51c3a42addfa918b43d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CHE272200871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae360c3945ef3bf465b37662b02da0a761b10478a9cf6d749e91e482825f685. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/CHE272200873.
Märchenbilder, Op. 113: IV. Langsam, mit melancholischem Ausdruck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672981fca0f0fc6ba252a6fbdc3d6b1877874a8a458b4f6527926c0802f718b2. 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/CHE272200874.