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 0x5fc4aeedc2e3ff7e27e013ec6522bd26d8b787d8033f9c845940897c910ea0e4. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca3c1fa9-f57c-41e2-9f9a-383e021fff62.json and https://artists.proofprofile.net/proofs/artist/ca3c1fa9-f57c-41e2-9f9a-383e021fff62.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jörg Widmann: Drittes Labyrinth | Polyphone Schatten
8 Poems "Letzte Blätter", Op. 10, TrV 141: No. 1, Zueignung
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 0xa67dc135f42b568b6a7025e42e78a39e7fb7c1183c4931b14613ceeff12140b8. 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/DEAQ72104101.
Christi Mutter stand mit Schmerzen (Arr. Payer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c55c60faa6b41ab17bbda5ffc4df58f90658abd28a825abe539c3f09997717. 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/DEB111200602.
Müde bin ich, geh zur Ruh (Arr. Johannsen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678cfa91fb4aeab436538035c164f79bdde19c4ea81a599ac2f310c00c10075b. 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/DEB111200505.
Wahrer Gott, wir glauben dir (Arr. Johannsen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd215cf96c6d20884312209ba693f3b2fa59dc2952019899ce71d27d3a3c1553d. 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/DEB111200609.
Lobe den Herren, den mächtigen König (Arr. Johannsen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1cdce7d6ca0f57b85731386d22b434f8a8a2e788d8c4a1fa2b10660cc4ecf7. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEB111200621.
Pastoral Symphony: V. La nature transportée de la joie élève la voix vers le ciel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd85c568a975b1efed8b944495f7d454cefbaa106b2f34faac95e2c8bcbfde7. 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/DEB111200105.
Stabat Mater, Hob.XXa:1: I. Stabat Mater Dolorosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78a87b2f517e614aba1404d0803435f7b8878fde6415e65ff6eb1db4662686e. 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/DEB111716001.
Stabat Mater, Hob.XXa:1: VIII. Sancta mater istud agas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3ddd069510d90e3df1ea0effb7e0d096e8b1b61d5b03a99468b67aca8d675f. 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/DEB111716008.
Stabat Mater, Hob.XXa:1: XI. Flammis orci ne succendar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170687070245fd8e7b7e81317f1718c286a0e7de164902c6f77584b2ef948314. 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/DEB111716011.
Stabat Mater, Hob.XXa:1: IV. Quis non posset contristari
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11287f64f289c77ed5a4b4126fcaf94c1766976e8a1a4a48a62709179663daf8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB111716004.
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
Stabat Mater, Hob.XXa:1: X. Virgo virginium praeclara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3509c5ee99b837d9d22be1e8dff88f8a3b2bd9feb110aed77ddfe09c3113580. 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/DEB111716010.
Stabat Mater, Hob.XXa:1: XIIIb. Paradisi gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012134d8488881bf68ab490f4677d9084496d51e7e61fedfef1d8aebf4631baa. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEB111716014.
Bach, J.S.: Mass in G Minor, BWV 235; Eine feste Burg ist unser Gott, BWV 80
Handel & Purcell: Arias & Cantatas (Live)
Wolfgang Amadeus Mozart: Missa in C Minor, K. 427
Mass in C Minor, K. 427 "Grosse Messe": I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe265e403f16af55d57f67685bb7a9b5001be33e9e5e67a31e5ae9e69537cef. 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/DEB111609601.
Mass in C Minor, K. 427 "Grosse Messe": IIg. Gloria: Jesu Christe - Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe64dbe9e014b787d0b8e98570b8350da62ee04a090947baef8ace7740d3c06. 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/DEB111609608.
Mass in C Minor, K. 427 "Grosse Messe": IId. Gloria: Domine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1bed3a2624f6afd1be6400dcbd978cdfa33a55f3b24aa2717141d04b0ab111. 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/DEB111609605.
Mass in C Minor, K. 427 "Grosse Messe": IIIb. Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0dc10c1944b7aa65d2a189623e84de616599d5debf0bd89fcb032679515a83. 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/DEB111609610.
Handel: Gloria in excelsis Deo, HWV deest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d7b1440d579bd2c53f1de9bd56898a8aec84532ab90fbae41f26c5dba00817. 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/DEB111000811.
Elijah, Op. 70, MWV A 25 / Part 1: No. 19 "Hilf deinem Volk"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b11fece13cdc49152a1cf86a3d3b1a1b1dc483457dbef2bcd18177600b58741. 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/DEB110800221.
Elijah, Op. 70, MWV A 25 / Part 2: No. 30 "Stehe du auf"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290cdce40fc521a1cbefa738d6b73815f7d467ca0a3f0994a7993760982b07fc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110800310.
Elijah, Op. 70, MWV A 25 / Part 2: No. 33 "Herr, es wird Nacht um mich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9287c7e6467a21c8e0bbe8eb74d9ffa525a3ae2009d549c7028621f27b8e287. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110800313.