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 0x9108f700fbbef736405917346b25d796838e7eb906bbf332dd72f4fd18b4b2e6. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a44a1420-e4ba-4193-bcb1-7d4f538d6dcc.json and https://artists.proofprofile.net/proofs/artist/a44a1420-e4ba-4193-bcb1-7d4f538d6dcc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mass No. 6 in E-Flat Major, D. 950: Kyrie
Schubert: Mass No. 6 in E-Flat Major / Stabat Mater
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 0x83bab14f238ade1cc6dc00e6e0b11d15d90d0415faeb78d583b31bd266832f30. 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/HKI190730201.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c991f96443bb727de53ed958b1498cf6757b07d9402fd6410a3c3ae684758d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKI190730202.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Domine Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea8777527e25c3299f5a6580ce611e8e30a041fa4a3c9b78c92f498fcb6bf47. 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/HKI190730203.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Quoniam tu solus sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08e79d0f2cf3762362dd27ee2eb90aba221dcc7a76eaa4ab1b2221a58557f83. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190730204.
Mass No. 6 in E-Flat Major, D. 950: Gloria: Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bf254e00be04183516055d062c9fd9e52e1525db5a795e66ce876e5d4805c7. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/HKI190730205.
Mass No. 6 in E-Flat Major, D. 950: Credo: Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddc5795f261be0d891a90400b864c0ef49e177ee0a659da22e5916ceb0ed41e. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/HKI190730206.
Mass No. 6 in E-Flat Major, D. 950: Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaeaa1893712d3cae227aef689580778dcf4c66fb83fbcfaa3cde6e09d2f6b8b. 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/HKI190730207.
Mass No. 6 in E-Flat Major, D. 950: Credo: Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29a9679628556a9e6fe176cec801be3c397af787abc42e70bc4570841fbddf4. 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/HKI190730208.
Mass No. 6 in E-Flat Major, D. 950: Sanctus: Sanctus Dominus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82241655ad2d5cc17ae386d5e178667b0d021dd4b719db606b5d601ab189bbc1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI190730209.
Mass No. 6 in E-Flat Major, D. 950: Sanctus: Osanna in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa222e5591bc818b2dce1bb83123717faf7170ff9eca352250df3405423905207. 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/HKI190730210.
Mass No. 6 in E-Flat Major, D. 950: Benedictus: Benedictus qui venit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9614e00befebcaac0e71fc4eaadbe16fd1aa87bdea5a697c20be79f5755dda. 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/HKI190730211.
Mass No. 6 in E-Flat Major, D. 950: Benedictus: Osanna in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bed6356f5e930605382ef248e58b8b9cba72abe10c33c039b7542b0e0e7d1ea. 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/HKI190730212.
Mass No. 6 in E-Flat Major, D. 950: Agnus Dei: Agnus Dei, qui tolis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5896c196b4dd3363a6624c764069afeb2bc9da36f33c39673d678dd537a2ac6. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190730213.
Mass No. 6 in E-Flat Major, D. 950: Agnus Dei: Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392b078928d480bc5784fdaee98ca9602d09eacb7f60d22d8e0c7cc01d9ed44d. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/HKI190730214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd513edda15390bb8213030aec6bbb09b936e4d2b87c4ed69339bc9d952f95c. 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/HKI190730215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1924d036f20a43305e44236c4c9218a409f690485af6acb208f7fd198418cf33. 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/HKI190730216.