Peter Neumann/Kölner Kammerchor/Collegium Cartusianum Köln/Franz-Josef Selig
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 0x5dbb8cae944cc0b2737a08488988441764066b8a5390f571df08423a2da51650. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ef515d8-be65-4fb5-9d63-410680607604.json and https://artists.proofprofile.net/proofs/artist/0ef515d8-be65-4fb5-9d63-410680607604.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Sämtliche Messen / Complete Masses
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 0x43424eb0017640762a5863df4ff63548c175656b5ab3fe380e21cad01cab2d16. 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/DEC628900603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673ec01364a02c0598f39cc263cdc83b0adf2d60cb21e6f7f46daecd92cd228d. 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/DEC628900604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766860505ac27fc0126491f22bb726ae30a86cb457bb692cd7caa154fe17a2ce. 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/DEC628900606.
Missa brevis in G KV140 "Pastoral-Messe": Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0609714e66375f01b98474729096dcb9bfddb8d2c39ab74b4ba4f1093a3f457. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEC628900615.
Missa brevis in G KV140 "Pastoral-Messe": Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998ad40d50a6391495117ac63aa39fe428a892ea5c1e58ede8dc0725597a903c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEC628900616.
Missa brevis in G KV140 "Pastoral-Messe": Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cdd861e9834c27cbec6e60878679af6909ac99bffa2c7c520fe24231d23063. 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/DEC628900617.
Mozart: Church Sonata No. 7 in F Major, K. 224
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4853a15644cd7ecbab4621160f895e1d6200148dbd4970953b87376adde309. 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/DEC629000426.
Missa brevis in G KV140 "Pastoral-Messe": Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252766036759f6e5f9f03815964419d66a5992762ef23bc2a3befcb577090dd6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEC628900620.
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 0xde70127727159124c0473965c19434a58c384b603cdc33edc479cc02f76afbed. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEC628900605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d14d30f6cd7f90ee87bb2eca9e57d82cdefe1d9cd8f358d7ef219bf9648a9b. 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/DEC628900607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369cc01845d819717f6f780e5223304f4eb49f01a28a0dc1e350ced17eab8b2c. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEC628900608.
Mozart: Church Sonata No. 4 in D Major, K. 144
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade81826e220c4a4110e10c4f142e14c2d7957ec932ade93d58250dadac2a721. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC629000425.
Missa brevis in G KV140 "Pastoral-Messe": Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f7dbc19d04fdaf63411c6b7d05199fbd5c19ef5434f9e1d620b8bbeef37383. 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/DEC628900619.