200px|right|thumb|Evaristo Felice Dall'Abaco Evaristo Felice Dall'Abaco (12 July 1675, Verona, Republic of Venice — 12 July 1742, Munich, Bavaria) was an Italian composer, violinist, and cellist. L
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 0xc60cdae6a3c701cde0f48e472058cd53d6eb8aab625a3995c054b9bbaa979db3. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36b33d76-3dca-4a91-a810-1649dc48a67d.json and https://artists.proofprofile.net/proofs/artist/36b33d76-3dca-4a91-a810-1649dc48a67d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Dall'Abaco, E.F.: Concerti for Strings - Opp. 2, 6
Concerti a 4 da chiesa in B Minor, Op. 2, No. 8: I. Allegro
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 0xe76b6fe265eb8caf15817ea40f814f05510c4bf8551a9e2d4a82ae7acc5216a6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980075 — a six-check JSON result.
Concerti a 4 da chiesa in B Minor, Op. 2, No. 8: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbb6bdbf065e8cadf5758c5b3e0b8d06b12ddea7a317ddc88ee5b86d71c84ea. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980076 — a six-check JSON result.
Concerti a 4 da chiesa in B Minor, Op. 2, No. 8: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3e8c00d82bb69698285f6a7dd1119dc8ee3fe0620033edfd0e0e4b05f92c27. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980077 — a six-check JSON result.
Concerti a 4 da chiesa in G Minor, Op. 2, No. 5: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5226056688fb629c368f2a7e94ad8df31c2c8bd02bc291f4b4e2815eb518f014. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980078 — a six-check JSON result.
Concerti a 4 da chiesa in G Minor, Op. 2, No. 5: II. Allegro e spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd188cfdd586f4fe2025a1ffc5e6f38f9dd84e746cfb9c5710aa4aacfca1eb94. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980079 — a six-check JSON result.
Concerti a 4 da chiesa in G Minor, Op. 2, No. 5: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1c40c3a5b8b541d11a0ee5006cb3a76d98847c14594ba4d06cd52c355b643e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980080 — a six-check JSON result.
Concerti a 4 da chiesa in G Minor, Op. 2, No. 5: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17cd4446254a18623a6caf91a26c80ca3b862c6687fff1a74376d5ccf01923f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980081 — a six-check JSON result.
Concerti a 4 da chiesa in D Major, Op. 2, No. 6: I. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f91fee88c3287c3aae8b7b188de3795305fde023196291e4f71f19264e248dc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980082 — a six-check JSON result.
Concerti a 4 da chiesa in D Major, Op. 2, No. 6: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87b2fd40da12824349420e6c2557a26096359543a22f82b2b654b13cb4b1ab8. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980083 — a six-check JSON result.
Concerti a 4 da chiesa in D Major, Op. 2, No. 6: III. Allegro e spirito assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc815ed72c603c1619c557066d73446350ff4a9fc48892378667a5975622d7a04. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980084 — a six-check JSON result.
Concerti a 4 da chiesa in B-Flat Major, Op. 2, No. 9: I. Largo andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41798bb8f0ae50ec22fa7961f958be4bba2cd8fc4417d63b7f7a38890537d7f0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980085 — a six-check JSON result.
Concerti a 4 da chiesa in B-Flat Major, Op. 2, No. 9: II. Allegro e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baf7fc2bd39fed388ea8c1663785b427c348a2ef6195018313045ac34437723. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980086 — a six-check JSON result.
Concerti a 4 da chiesa in B-Flat Major, Op. 2, No. 9: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd116812e2a0d76e6c1c7f8ac621a7d6d4aa90c67c6ab685c7a429a410fda4305. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980087 — a six-check JSON result.
Concerti a 4 da chiesa in B-Flat Major, Op. 2, No. 9: IV. Allegro e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d0432ffdd22cbaa1442cec7e79ff4eb3222fd6371d28bce71f12e5bf0a5db4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980088 — a six-check JSON result.
Concerti a piu istrumenti in F Major, Op. 6, No. 3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d521be708e32f05a9945cc07b391ba60655520d46447c7801bdfeb8cb16e1e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980089 — a six-check JSON result.
Concerti a piu istrumenti in F Major, Op. 6, No. 3: II. Largo sempre piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60784323384b48da529575d8bcd7bf4964ce23c185c569b9dd427cd599561f07. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980090 — a six-check JSON result.
Concerti a piu istrumenti in F Major, Op. 6, No. 3: III. Allegro e spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1304250ae600c8ae213528ddeffce0f52d9a3bbf5104346ad6a44eab98eeb36. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980091 — a six-check JSON result.
Concerti a 4 da chiesa in E Major, Op. 2, No. 10: I. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51b5f59a2fa541fb3d51bf76cdc252f611cd1501283f7fcdae3d8e26173f6d9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980092 — a six-check JSON result.
Concerti a 4 da chiesa in E Major, Op. 2, No. 10: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e7c991f6ff0b1e5715df75d5f5d5494d82f7572909a8737f41280152163595. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980094 — a six-check JSON result.
Concerti a piu istrumenti in E Major, Op. 6, No. 2: II. Aria cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933e45303d2c3be42445fa086d6b5eb50e2ccfebade327e0956e65a64d219e22. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980096 — a six-check JSON result.
Concerti a piu istrumenti in E Major, Op. 6, No. 2: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc138ae01dd0fe49bd97b9a807970d759e34fbc34a50471c8ac93a2e147d791. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980097 — a six-check JSON result.
Concerti a piu istrumenti in F Major, Op. 6, No. 6: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d9d37dd5722b2b4e536a5f92a7eac89573d918d73624fbfb580dde1dda6fe4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980098 — a six-check JSON result.
Concerti a piu istrumenti in F Major, Op. 6, No. 6: IV. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082f6332f9b4d8caadcbd324bf0a4f77d226152dfa7648bd1fe72ea37cebcdc4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATPD50980101 — a six-check JSON result.