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 0xa76e6c067537f06432fd7fc4667a228e2110c3f28cab4f2ae6891187fd863abf. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d62c004-2cde-4193-9662-5e7dad009493.json and https://artists.proofprofile.net/proofs/artist/8d62c004-2cde-4193-9662-5e7dad009493.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto in D major for Double-bass and Orchestra: 1. Allegro Moderato
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 0x4128fc972df8355f976ff892101c37b0c0c0597d8ee768f70e285808107b5d4b. 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/ATUM71500333.
Concerto in D major for Double-bass and Orchestra: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a70d4ac7e015b5d33d204bd318f71629cbcdee83992076be900e2ab7fb2840. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ATUM71500334.
Concerto in D major for Double-bass and Orchestra: 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26c17753db9185401e01e5f6274e6a6a9a673ecaaaddf5bb9e89b116c7d692d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ATUM71500335.
Concerto in E major for Double-bass and Orchestra: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd5c3fe65644c3821143a0e2afb3ab664bc09e9da87e24c94b6e6700626d3d9. 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/ATUM71500336.
Concerto in E major for Double-bass and Orchestra: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a8854a8a9709a79383710ec98e4773937e410ad66424b4d3c5f26f96f433df. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ATUM71500337.
Concerto in E major for Double-bass and Orchestra: 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde10ad355c9e4be4f72830fd6987874f32858661f68a26f66670253d1ee0f232. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/ATUM71500338.
Concerto in B minor for Double-bass and Orchestra: 1. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7de874eeb3bf287b5d01245b25963ee7199453afd2f69cd0f27262820a252f. 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/ATUM71500339.
Concerto in B minor for Double-bass and Orchestra: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cf3f2af371aba3d97c8c8082c3246508a83f4d3e2ab6b1ad92781e0ff3e084. 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/ATUM71500340.
Concerto in B minor for Double-bass and Orchestra: 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f50870d63b83fd55b7613b6892f27237d76ce2ba2f4c8c1ba657b9fe1cd42af. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ATUM71500341.
Passione amorose: III. Allegretto (Orchestrated by G. Jardanyi)
Bottesini: Works for Double Bass (Complete), Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3955053c30b12ec6d3d9134208fcdcf7ed363abf9d6731541618ae4bb7d0f36b. 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/HUA253210010.
Passione amorose: I. Allegro (Orchestrated by G. Jardanyi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98c6f872df92d0097b1ff37441e73e549656ca73a2956e539daea680a2f0ae5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HUA253210008.
Gran Duo Concertante for Violin, Double Bass and Strings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586aba1418dd27684983431621e7e72d73f1522a094153e46506affa190fc9b8. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ATUM71800176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb33ec5e28257ecc711630581968fc976797ab55b674c55e88f727ae4507802. 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/ATUM71800175.
Divertimento concertante per contrabbasso e orchestra: II. Marcia. Alla marcia, allegramente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa6759f06d61bd67dabf1f164940e493a91f3332ef4cc6da6cbf33815e861cc. 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/ATUM71800180.