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 0xe5008cbd87b4dcedd35182c64f625fe493def61d2190bffed1d6fc287a74b7b4. Chain 2 (Bitcoin): anchored in block 953980 (2026-06-16T17:16:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c872439-1764-4c68-973c-eaa912c340b0.json and https://artists.proofprofile.net/proofs/artist/2c872439-1764-4c68-973c-eaa912c340b0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mass No. 6 in E-Flat Major, D. 950: I. Kyrie
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 0xdbd76e4b4e1ab87d80915cda235b2f77eda21bca159fe9dc855af703760b4a81. 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/QZJYM2300801 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IIa. Gloria. Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe316ca898f973ca6dd762be768186d1ad3aace6120a7a9e83ec2de9a6905a133. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZJYM2300802 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IIb. Gloria. Domine Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421a2a3128b6e4f3b2cfa55b1e0311c9355af7464b5f2bc5eba98c16a0b0d04d. 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/QZJYM2300803 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IIc. Gloria. Quoniam tu solus sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2f5e311e237148e0e5a592a32bf322b7e9cdaf902ad6006ca63caaef0a0798. 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/QZJYM2300804 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IId. Gloria. Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3e508d32a7391e49779c55c4546d9454235cf9a2c548a0332e6f00d1a2c9b3. 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/QZJYM2300805 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IIIa. Credo. Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c9c21a910dd90176842608a463c78eb198a38db025e3eb4d678afe1dc2b477. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZJYM2300806 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IIIb. Credo. Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea55600f3797ba8ecbbec333688497d27d69438f53045bc8d9b32fea17f8e63. 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/QZJYM2300807 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IIIc. Credo. Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc971b5948ea1059d0e582f673079f80269f0279ecb6a0cc770957fd6baa6681. 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/QZJYM2300808 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IVa. Sanctus. Sanctus Dominus Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f68f31903785e6bd03efe791acc8a5de5080dd6236d11b65ab0d29573494ae. 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/QZJYM2300809 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: IVb. Sanctus. Osanna in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78b767154144c1ff5caeb2eeaf507fdf062a3e676e07f9667da196c05d647cc. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJYM2300810 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Va. Benedictus. Benedictus qui venit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9538e752dfad031c699e1a9203fa7c88a7504d468e8c734cada55978498f2f. 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/QZJYM2300811 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: Vb. Benedictus. Osanna in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99fb8dc44729292e13e62c657c1127d47d0a6e9b1b6afcc1a9886c26cac0d19. 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/QZJYM2300812 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: VIb. Agnus Dei. Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fc4ef57f648bdb8e9bc7ca8977d7d2b6fd3ce1768047cacd43657bd06b72c5. 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/QZJYM2300814 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: VIc. Agnus Dei. Agnus Dei, qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948aa83d1dd9cb17b17efd577fc613467c8f08593a21f241543453b0014e3235. 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/QZJYM2300815 — a six-check JSON result.
Mass No. 6 in E-Flat Major, D. 950: VId. Agnus Dei. Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccaf1d2fc1c5b6be9b239f7648ae1bb7c8074a61ea76e34e477aba3570bce47. 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/QZJYM2300816 — a six-check JSON result.
Walton: Belshazzar's Feast: I. Thus Spake Isaiah
Walton: Symphony No. 1 & Belshazzar's Feast
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dc20a1bd6ec92215f8e7ffb28e81c1ebf20d6d66f1faa24ea90a7cc58fc3b2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9701061 — a six-check JSON result.
Walton: Belshazzar's Feast: II. Babylon Was a Great City
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe836ef98c3cbc5119713a9fadd682e9db2162a826a594aa9684d238b806be14c. 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/GBAYC9701062 — a six-check JSON result.
Walton: Belshazzar's Feast: III. Thus in Babylon, the Mighty City
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0812fbf17f55031606542014364ba7dda8b65b9465a9b38373120accce390f50. 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/GBAYC9701063 — a six-check JSON result.