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 0x1a9f8f9ed52c98b39e40c53af4141be489d2d4b5ac547be441ab45c4c837c751. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc534808-5db1-4fed-b68e-2a91f4e5c90c.json and https://artists.proofprofile.net/proofs/artist/fc534808-5db1-4fed-b68e-2a91f4e5c90c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Der Freischütz, Op. 77, Act 1 Scene 2: Dialog "Wo Agathe nur bleiben mag?" (Der Eremit, Agathe, Ännchen)
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 0xf0a043f9e4fb51f32b837963603ac85dc36f0ca34ad5d9f8ae27c9f3b36d2772. 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/FR7JM2157030 — a six-check JSON result.
Der Freischütz, Op. 77, Act 2 Scene 1: Dialog & Nr. 6, Duetto "Schelm! Halt fest!" (Ännchen, Agathe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3b6a9fb358125f2653d86119d354b456c779299864b7da3d75a54fa5ec104a. 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/FR7JM2157150 — a six-check JSON result.
Der Freischütz, Op. 77, Act 2 Scene 1: Nr. 7, Arietta "Kommt ein schlanker Bursch gegangen" (Ännchen) & Dialog
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa474ea18799c967da2833e01bd8076c76da3fc2eb318adc0749abfb181307ac2. 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/FR7JM2157160 — a six-check JSON result.
Der Freischütz, Op. 77, Act 2 Scene 2: Nr. 8, Scena ed Aria "Wie nahte mir der Schlummer" (Agathe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f167dfa7dd95583b5a7ba2bed70c86d988a6f90e5dece4724603f23a429384. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2157170 — a six-check JSON result.
Der Freischütz, Op. 77, Act 2 Scene 3: Nr. 9, Terzetto "Wie? Was? Entsetzen!" (Agathe, Ännchen, Max)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb6598047a3009d339b08e2782f4c4a65541c12b7de9da78f0031cbb4772975. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2157190 — a six-check JSON result.
Der Freischütz, Op. 77, Act 3 Scene 2: Nr. 12, Cavatina "Und ob die Wolke" (Agathe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c7e97fe97d092505bb52bef1fdb4ba6ea8e23e71acf9ffee4e9fac553bf432. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2158080 — a six-check JSON result.
Der Freischütz, Op. 77, Act 3 Scene 3, 4 & 5: Dialog & Nr. 14, Volkslied "Wir winden dir den Jungfernkranz" (Agathe, Frauenchor) & Dialog
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947b0112911740cbc0a5000406100398e79aff13145abecaf1465fcccdb5068f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2158110 — a six-check JSON result.
Der Freischütz, Op. 77, Act 3 Scene 7: Doch jetzt erhebt noch eure Blicke (Der Eremit, Chor, Alle)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38f7d929fff4d09f2d94633702737e8b48c3aa0c30072412719747cb122ecee. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2158180 — a six-check JSON result.
Missa solemnis, Op. 123: Kyrie "Kyrie eleison" - "Christie eleison" - "Kyrie eleison"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75632515b286cf22d3042b51507e833f86e277f1494a7778256bd2fb1d4c8341. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/FR7JM1932010 — a six-check JSON result.
Missa solemnis, Op. 123: Gloria "Gloria in excelsis Deo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349434b433815b4322f1f0211503a7f085ff6ff02c8ab06ba0eb7160efc29298. 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/FR7JM1932020 — a six-check JSON result.
Missa solemnis, Op. 123: Gloria "Gratias agimus tibi propter magnam gloriam tuam"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96004e396eef9652bf8ef759ea4f076b49ed7ba05ec3ec6670271370c7990a34. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1932030 — a six-check JSON result.
Missa solemnis, Op. 123: Gloria "Qui tollis peccata mundi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce762e1b6416171b46f1eb433ed688894e84494baf64e94eb38666903f1ed241. 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/FR7JM1932040 — a six-check JSON result.
Missa solemnis, Op. 123: Gloria "Qui sedes ad dexteram Patris"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343e67ed6a2a3ffc23e39da52d87555ec33c884b0b4fe0d99f5775b7b3891bbb. 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/FR7JM1932050 — a six-check JSON result.
Missa solemnis, Op. 123: Gloria "Quoniam tu solus Sanctus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8c4e5ceb9b0a9e96159ab992256018f9ec07dafb33e3618373c722ec240840. 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/FR7JM1932060 — a six-check JSON result.
Missa solemnis, Op. 123: Credo "Credo in umum Deum"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d32df8e37a84fd4e02940c9cd5edc3937ee9acda77e9f9a6f2ce11ebdb4bfe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1932070 — a six-check JSON result.
Missa solemnis, Op. 123: Credo "Et incarnatus est de Spiritu Sancto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4551a4cb2bbca4c05b223213e4625b55c8a4a874513764e81342a6005f947c32. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1932080 — a six-check JSON result.