thumb|Thomas Bloch and his glass harmonica (2007) Thomas Bloch (born 1962 in Colmar, France) is a classical musician specializing in the rare instruments ondes Martenot, glass harmonica, and Cristal
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 0xfa9f250e64277e2ea0b9087060ab4e670be607e51ed7aed2cd58a83685c4af97. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/936fcbbc-113d-427d-a1a9-988509271ca0.json and https://artists.proofprofile.net/proofs/artist/936fcbbc-113d-427d-a1a9-988509271ca0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x8f012047ad33f9c3a7e8005122a75890b007332085154515533723c636e170e6. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/HKI190117901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d490b1835808be5e9a9e285150185173b0488abd1235ecae04cb941627de5ba. 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/HKI190117902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbdeeec8ab597ed023b8d20925201fd04b9ecba3b8e1e824c7ac80efee8dd63. 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/HKI190117903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b32a3bbd14439ea18c1254c69c51bcb7d3da116a86266ce2b3f5955a43a07d. 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/HKI190117905.
Adagio in C Major, K. 356: Adagio, K. 356
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a86cd1144bf563775506c2c1853e8f4d05aced757631f3e3db96bd0e5abd15. 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/HKI190117906.
Adagio and Rondo in C Minor, K. 617: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9fe25f4905d19626f39f9d7b1ad8847f6a1f1835960e18ab8e381d2f21eb25. 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/HKI190117907.
Adagio and Rondo in C Minor, K. 617: Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630f643266ff2a8fe266919d2e7a456ddd32d9e91dbf8c0e3cfa48ec3b35698a. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/HKI190117908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6236c697c1a10c0de5b6a6bf77317e18791e4a2e4a9450cc7f5333912c4d849c. 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/HKI190117909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382a49271c885f9bd25d3844879f017f7ffccc828181641d81ead856da788727. 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/HKI190117910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344fae7dd23e3eede7a9d9a4d5c105436bdf5640ab9567850403e4fcf6a88cbf. 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/HKI190117911.
Il trionfo della musica: Terzetto, Adagio (No. 9)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ecd17ed68d0a3c568417727a29e81d20ebf1af8bddd538cdc06c94429cac8b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKI190117912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffb874bcdd4f2c149373fcde93fd46f37267114420612cca2777037beda88c9. 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/HKI190117913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb15b2bd3de96df69a147b0788569c528c839db0fb3da6210e18919a56d0f60. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/HKI190117914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628ac3db6970d830bdd5f007cba858e5002849cfe1cea00e25b3b44cb9a3b37a. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CZB872005003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50e062bcaf6ce18ea46d3946ab455703bca346380175f3c56d231e5f67676b7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZB872005002.
Polish National Radio Symphony Orchestra
Varese: Orchestral Works, Vol. 2 - Ameriques / Equatorial / Nocturnal / Ionisation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd79193d3b335de7d2caa5da7ec223fc7cb5b2c8fc729d466654b4d6e8957af. 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/HKI190703802.
Adagio for Glass harmonica in C Major, K. 356
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8a15bc48c9b0bfe55eefc2aea5caf97c2185f8e0e3a93616ca803ebdc7f322. 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/FR7JM2103010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291edf580ea94d6158721f9b5db6ceec5b5763ab97b36ec9ce01b76c75af425e. 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/CZB871708001.