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 0xf201807746119d146cea41d0351f72672fa45e647446b0017141062ac562de20. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71eee2d6-1585-49e5-91ba-5de0b5e48945.json and https://artists.proofprofile.net/proofs/artist/71eee2d6-1585-49e5-91ba-5de0b5e48945.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Franz Joseph Haydn: Violin and Cello Concertos
Cello Concerto in D Major, Hob. Vllb: 2: II. Adagio
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 0x30ed3ed5c953433838c423c049d874927df91d0a2cee456a90be74c195219d2b. 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/ES5021600716.
Adagio from Cello Concerto in C Major, Hob. Vllb: 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68d000f0395eee2eefb1eeb6b91d3d7d78229c0a29d9e28b5cdfc2bd5ac00bc. 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/ES5021602347.
Violin Concerto in G Major, Hob. Vlla: 4: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a234258c5de40c166b5b08f714eb491fd3167097b2fafd372c152eeb3646a1b. 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/ES5021600707.
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
Violin Concerto in G Major, Hob. Vlla: 4: II. Adagio.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b770be231f23294ac7c4c38f9b3bb89685174f97bb62ca8fbb2d2b502467d89. 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/ES5021600708.
Violin Concerto in G Major, Hob. Vlla: 4: III. Finale (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfa01ad14e0f496106ebc630e79995af859003dedc49caf2bd7622bc014c526. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES5021600709.
Violin Concerto in C Major, Hob. Vlla: 1: I. Allegro Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05cf8141f626fbe1261cd522f4cb6c9480e161806a49bd50fe693c7f6d54b18. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ES5021600711.
Violin Concerto in C Major, Hob. Vlla: 1: II. Adagio.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b938333546fcb81be632dd6e4dae049c9b511d8a49ca3bc718e4c3f035fc18. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES5021600712.
Cello Concerto in D Major, Hob. Vllb: 2: I. Allegro Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695c1364fc78aaa3f887a2f90f2914ab2cf7a24dfd536ddc2dca72bcd718b656. 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/ES5021600715.
Cello Concerto in D Major, Hob. Vllb: 2: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dd64915d6c4cf3a9ab495e35c4e4cebfa481701acf9ba7d69c9168185340fe. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/ES5021600717.
3 Romances, Op. 22 (Arr. for Cello & Piano by Anonymous): No. 1, Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fd00e35677964b5f908a9d95465f3be1c2ba2b9aaeabed2c23cf1d09828f0f. 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/ES59G2420101.
Goldberg Variations, BWV 988: Variatio 1 a 1 clav.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992d6f45e0af38b6678577c217ec0c20abe61d6eec8a1208ce19259ccf8603e1. 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/ES5021200674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a29d46102e12962ef4dd1804745d1cfcf074dca006abb39becf2dc1e9cced6c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES5021200673.
Goldberg Variations, BWV 988: Variatio 2 a 1 clav.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589fa32a40163673ebb8660027e78bf200fff9893e8ca77f9295774eee1ecfd9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES5021200675.
Goldberg Variations, BWV 988: Variatio 3 a 1 clav. Canone all' unisono
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef04a8a458a16c15625282531ed0720c704ebf52789eef3d949df161eb176e9. 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/ES5021200676.
Goldberg Variations, BWV 988: Variatio 4 a 1 clav.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e757c3abad65546b0e9ea763887448d1b1910d71ec42b9ac932a966b5b6ee94. 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/ES5021200677.
Goldberg Variations, BWV 988: Variatio 5 a 1 ô vero 2 clav.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb083ce616bf5250a41cb3978efeb4811d5f84fb63b19d2ccd2c10cf2e367c3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5021200678.
Goldberg Variations, BWV 988: Variatio 6 a 1 clav. Canone alla seconda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cc9db52fe47eee395d01fdb2b1284230715fbc345baf57545666cf7cb7a70b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ES5021200679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d2015c30f5735380a365129c4e4765ea87234d95eeb807a2a1c73598091672. 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/USHM81494655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4783952c87075b10e9acae1cc4e056e0b53b9c6000cd0016e9adb962050ffb88. 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/USHM81494664.