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 0xbfc72f0ce4200a77b1f2c3ccffed381e8fa2019f5bed2a2b235b3858e653bc7c. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5edf25ed-aab7-4d37-b135-d622f79c34f0.json and https://artists.proofprofile.net/proofs/artist/5edf25ed-aab7-4d37-b135-d622f79c34f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Landscapes. Takemitsu, Hosokowa & Nishimura
Yashiro: String Quartet: I. Adagio ma non troppo
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 0x6e95b9e41a92e776e1c4f1dbe4f860a4ab11dfd1680823f866159836aa83ebd3. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809945201.
Nishimura: String Quartet No. 2 "Pulses of Light": Pt. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ecaa7bb6dc403a1a1eec97b158ea1463236c5587f6065361465d87485efbc4. 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/DEA809945301.
Hosokawa: Landscape I, for String Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6246bf9a69f2d3e37524fb1014ef04b6eca23cdacd9b214033578d3cd8861f. 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/DEA809945400.
Yashiro: String Quartet: II. Prestissimo, un poco misterioso ma scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a9577e356cda48f18b6ae72dc1b5a37fc257ec5def4c15c2ae347667a2b19b. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEA809945202.
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
Yashiro: String Quartet: III. Andante espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0dea63fcb6332b5839ec4e88922d28b29654cc74a5fc369764b82f073e01a2. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/DEA809945203.
Yashiro: String Quartet: IV. Allegro giocoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249014ff191195858a7417e92d34c635e702ae4afa3f5cbfdf21550dd66cf6c0. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEA809945204.
Nishimura: String Quartet No. 2 "Pulses of Light": Pt. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0f3f74286b8d5957eca70601eeec03d4b7568deca2ab4149d8401c7dbc1341. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEA809945302.
Takemitsu: Landscape, for String Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98bdf8d0f01d03f4b36ff17f8a7e0fb5df1f6de389d8b5790379a1d3d29b0008. 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/DEA809945500.
Miyoshi: String Quartet No. 3 "Constellation in Black"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eecf8951d4537c4c98888bd1c447532a8921a1448302f686693f91102c58d14. 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/DEA809945600.
Die Kinder des Monsieur Mathieu. Lieder aus dem Film »Les choristes« und weitere Lieder für Kinderchor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a3e1130b2ecedbda3acb0a12385c7eb5d60eb92babbe17f43c2f432ee60367. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB111102301.
Sanft weht ein Hauch überm Meer - Version 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c12f61f5d6f53e5a499d51edcfb9725316ba0852f7f73bab4fea981f3336cc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB111102302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a22c117b681ec3ceb288ea349d2dc7a4157ee3e560f4a32be0f618e9c46d21. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB111102303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ae5a30233782edd96500adce27c7973e4ffe64295771ea64defd10e2396044. 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/DEB111102306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390e195f58f87e39f85d1aa4e03a7d7254df67ebb419fcdc37eb630553103d47. 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/DEB111102307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bba0b920e41c0f0405e17d68520a60b8e18730f00810c37191370432c3a832. 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/DEB111102308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb5afdc56e2d3386be702c38ab8b1a90998f1b2ce7649caa2c0fde8312d8743. 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/DEB111102309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929034b6ea680d214e222dfe2ccd7a53f04f99d93303c9935403f776f77d0444. 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/DEB111102310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa042222bc6996ef38f7f6aaa09b94068912be16b81276a7b91b5c85ed433ad82. 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/DEB111102313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21685956c51ba42b8e4322f732976f3ac2f0bea879d1e80bcabbf77e7b9f864b. 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/DEB111102319.
Sanft weht ein Hauch überm Meer - Version 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec2215dc672099390f29b5977196a333116e1e51d350369917620dba0066284. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/DEB111102320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b3af226c3e0e86cba45ed0b964fd8d47d69b63fc09f5048a9b76c660035edd. 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/DEB111102321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5963dd6e548d4774a6c4e75d1c058b8e1f572d9bd5746b9367ee3edce5654aed. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEB111102324.
Sanft weht ein Hauch überm Meer - Version 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbdc881e115fc38b70a7a04074a1dff6cc87c4eaadb280ee7a60f53ca4c9ebf. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEB111102323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb787913f5ef04022a665b72e48d113a1695e78b710e64e6291975b23000884. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEB111102304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8dfe09aea7a170512d97e64691387a0443888e3a9a2af485240a13550fc616c. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DEB111102305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc593fa764536b62f44aec358a71ff32b4d853ebd0c5006e7cc62baaa71aed1. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DEB111102322.
Mozart: String Quartets Nos. 21 & 22 "Prussian Quartets"