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 0x286a55796c1010ae7381937d76d34e4fd3520f9978c0b2016dd48d39e1d9fd87. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4c93c47-a83f-42ff-ade4-2f82cf55e4ae.json and https://artists.proofprofile.net/proofs/artist/d4c93c47-a83f-42ff-ade4-2f82cf55e4ae.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
String Quartet, Op. 29 "Divorce": III. Presto
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 0xfcf8f700a4fbea725a1d17695edff89fc27d98a42d28b74281f0268805e58c4c. 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/DES382023003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fec1774d95c4d4dddff4e84f6e8c127f3421224a6927a755f47e06564d7b18. 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/DES382023004 — a six-check JSON result.
Streichquartett No. 3 "Mishima": Closing
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc305a14aa0fd8f9ba714eda1c2c391cbfc5e06d2430c2f16097c7f3bd3ce82. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382241001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db5c276e904ce36bef08d7119c25c631ab31cb6b101dd3bf225a8bf8d7664a4. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382241003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1088de016ed4999ff714920e42d13925cef7594b8842b5594f8e774562836e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382241002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a62cc8a34c264b6831b862f0e96b4b86bcaa69e20a3247beb374ed5c73dabf. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382241005 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a00cf3a16f92ce96ad736cb4112aa019188eee33fe5768f4d4093dae2ee1a7f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382241004 — a six-check JSON result.
Böhmischer Traum (Arr. for Strings by Siegfried Rundel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f59514e2c3201ac13a2050cd55be93fdac8c4a180829f9a807a1eea0de1205b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382321001 — a six-check JSON result.
Der Tod und das Mädchen, D. 531, Op. 7 No.3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623b7af59c08c807eab788188f7fbfaf2d1a1474b56e18dd096d9ff7b7b12ada. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382321002 — a six-check JSON result.
Streichquartett in D-Moll "Der Tod und das Mädchen", D. 810: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ab2e9c5e6cbbc1b118af180f172b24e64ce853a3a6bf5691f43e2a4082dc2b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382321003 — a six-check JSON result.
Streichquartett in D-Moll "Der Tod und das Mädchen", D. 810: II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6d84d8e302e5c0ca91ae2578862cb23fa151608986cab458723786bc464a42. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382321004 — a six-check JSON result.
Streichquartett in D-Moll "Der Tod und das Mädchen", D. 810: III. Scherzo. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500967e9968d92de6f40caf03066f6926df941ba7190c377db082da6258d004d. 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/DES382321005 — a six-check JSON result.
Streichquartett in D-Moll "Der Tod und das Mädchen", D. 810: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3cadee10f325f15673cd34b2d45a8a76a000d5097a612f37af55dae4080054. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DES382321006 — a six-check JSON result.
Winterreise, D. 911: No. 11, Frühlingstraum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93e96dbdc0052b029373c7c50288ac868f50ac7981978ceafd2b2760a3f06b2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382321007 — a six-check JSON result.
Schwanengesang, D. 957: No. 4, Ständchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba0857e7686a8c33210c2c33bbcd72e6d6b13749f21acd56cbe7ee2ca36462e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DES382321008 — a six-check JSON result.
Ave Maria, Op. 52 No. 6, D. 839 - Ellens Gesang Pt.3 "Hymne an die Jungfrau"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9812fd58294a18625785a049eb164770275c0d6549a847b9fb10e974126cf4. 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/DES382321009 — a six-check JSON result.