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 0x8a06331e0213e331b73724f5e2e4b7a70b6ba9753d67db5249c013da18a0812f. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/024c9b4d-07f6-47a2-9524-a66aac558aa0.json and https://artists.proofprofile.net/proofs/artist/024c9b4d-07f6-47a2-9524-a66aac558aa0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Leonardo Leo (1694-1744) Six Cello Concertos
Cello Concerto No.2 in D Major, L. 10: IV. Fuga. Per il portamento dell´imitazione del 2 pensiere, o soggetto mi con fervito della risposta d´imitazione
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 0x47cfb69fff9eb636938cee72bb56fee6773689bfa0fab913047b45680b5059c5. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CAIOJ2300016.
Cello Concerto No.5 in F Minor, L 40: I. Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b34e391da9cb3ed81ac224c15a208dc327b67d1678d8012dac02f10383d0b43. 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/CAIOJ2300018.
Cello Concerto No.5 in F Minor, L. 40: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f758f5a395028cb59704e1acb864a0dcfd89b417bd03188023e826f0c51c325. 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/CAIOJ2300019.
Cello Concerto No.5 in F Minor, L. 40: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7229284fecd8109d2cf3fb10ed4638c5088a0299f6e7e99507597f3af4f41eee. 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/CAIOJ2300021.
Cello Concerto in A Major, L. 50: I. Andante piacevole
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6ee4038800dfc2fe63e7909247352a75cff2ba2bb289f23082510dbaeebda7. 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/CAIOJ2300022.
Cello Concerto No. 4 in A Major, L. 50: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b7b46b4f2ade9b173aebf8f65c293e7660a8ebbc98def8bc29cabdc5c64c3c. 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/CAIOJ2300023.
Cello Concerto No. 4 in A Major, L. 50: III. Larghetto e gustoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d3751412c383c6c9551434c9353e6f1dda77c40eb65c2dcc4a6e62ac02fbc. 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/CAIOJ2300024.
Cello Concerto No.3 in D minor, L. 60: II. Con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f2a48a31659d722b7de553193968e2a33b46d693dc666a134f52350eb3996a. 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/CAIOJ2300027.
Cello Concerto No.3 in D minor, L. 60: III. Amoroso mezza voce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa9574ce00bfbd7de8d5f9cde89c265ba927c305eb725a0955db448dce474f8. 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/CAIOJ2300028.
Cello Concerto No.3 in D minor, L. 60: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d25840c8628ec57e28cb72726abde27e4eb5fea6926c4ffb0c15579c91016c9. 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/CAIOJ2300029.
Cello Concerto No.1 in A major, L. 20: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69c13f208fc8a0db0a13175d832211621d2dc204d7a056e868f650038492947. 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/CAIOJ2300033.
Sinfonia Concertata (Concerto No.6) in C minor, L. 30: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6049f76e7e940288210a800ea09b25fd32ed7780d836efcc26a2c27160cb33d2. 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/CAIOJ2300035.
Sinfonia Concertata (Concerto No.6) in C minor, L. 30: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bcbcf1b3188ad29c92dca0d8f08fbc7fe8bccc6c7ff07aca68859d5a9ae543. 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/CAIOJ2300036.
Cello Concerto No.2 in D Major, L. 10: I. Andantino grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ae9ccb0771f99385e3becf61e5057639cd0e1355073a79f6a8bcc25fadf9a4. 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/CAIOJ2300013.
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
Cello Concerto No.2 in D Major, L. 10: II. Con bravura
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d75a7ed8e3605f95b2f78649be1c6ca80b37d07add0c78cc9092101727c80c6. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CAIOJ2300014.
Cello Concerto No.2 in D Major, L. 10: III. Larghetto con poco moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26e41df4c0f4842c12cae62e6a41e58f2a6e6159ea0ecb19b2ab1252da1b3be. 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/CAIOJ2300015.
Cello Concerto No.2 in D Major, L. 10: V. Allegro di molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e4500489dee95f93ac9620bd0a0562ca52f5aaa8ffaeac0922b979abd1edc2. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CAIOJ2300017.
Cello Concerto No.5 in F Minor, L. 40: III. Segue il cantabile - Largo e gustoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b1d033421a14ee9df89fcbf6ae51c43814c81d6fc06c7eed533c488259d8c3. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CAIOJ2300020.
Cello Concerto No. 4 in A Major, L. 50: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c6f98eefef1d2ba1d8aeeba2832a737b9ea77ebeffaa72efc995154f39d1f1. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/CAIOJ2300025.
Cello Concerto No.3 in D minor, L. 60: I. Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795335aff9c00972699e4a325c5780fb2158f9202ad693c75520efe338788cdf. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CAIOJ2300026.
Cello Concerto No.1 in A major, L. 20: I. Andantino grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef64544971f6410b89fa5fdc509e9f4119b856905d8663464f4ba781d2ba49cc. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/CAIOJ2300030.
Cello Concerto No.1 in A major, L. 20: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb05dc4534b5fa8b219637ca80ba042fdf24b5f618b374e02ce883732192be61. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAIOJ2300031.
Cello Concerto No.1 in A major, L. 20: III. Larghetto a mezza voce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cd2dbd0c73b71be94018d86c42de52606370fcde0a59b82041960e8fe906f9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAIOJ2300032.
Sinfonia Concertata (Concerto No.6) in C Minor, L. 30: I. Andante Grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0200e78896f6b3ff70bee13895581bfde46768f2fd157e619e0cf238db6102a5. 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/CAIOJ2300034.
Sinfonia Concertata (Concerto No.6) in C minor, L. 30: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812721e411e7966a1732fca7d60d8855c815d142e4d69aa71c3a3fdfcd65a4be. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CAIOJ2300037.