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 0xd364dcd326d19f49a835f94ad6f4a27edc9258b913558245f72ea23484ee3284. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e051d65-6003-45dd-bed0-4b901824eda8.json and https://artists.proofprofile.net/proofs/artist/0e051d65-6003-45dd-bed0-4b901824eda8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x852d9688847e245413bd73b5d5713546e3ba92f6dc1c8f92f8313081d9f7d6c1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBAYC0302119 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 1: Chorus. "Banish Sorrow, Banish Care" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4eee01a7af9b75d08469cf800246f3b6c4159f77f46abaeaaff99317d55daa0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302085 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 1: Duet and Chorus. "Fear no Danger to Ensue" (Belinda, Second Woman, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec84852f9af27130fd76d918d676ff6228d5670c575a1a854a55ef9c3a625d9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302090 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 1: Chorus. "Cupid Only Throws the Dart" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9d0d4cb1a0362b2b110a7043b5405b70b8c27eec6453f1218b1ac2b28a6db6. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBAYC0302092 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 1: Chorus. "To the Hills and the Vales" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56e0cbfa0bf78e33cdc018918ee4d7fe9870522f3cb0a61846335c975df2d98. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302094 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Prelude for the Witches. "Wayward Sisters, You That Fright" - Chorus. "Harm's Our Delight" (Sorceress, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a34e914f9522cea41bf1826536434c91c5eea0e745ec747c863efb163b177e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBAYC0302098 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Prelude for the Witches. "The Queen of Carthage, Whom We Hate" - "Ho Ho Ho" (Sorceress, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92aa7bd70495150cdd60f260bf6018b77d4f661ac4a323f434ca3c64c48ee6c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302099 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Trio. "Ruin'd E're the Set of Sun?" - "Ho Ho Ho" (First Witch, Second Witch, Sorceress, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16772e0fba26565fb7e05974c3736d5499548472dcc3e9f53717f2c49930891. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302100 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Duet. "But Ere We This Perform" (First Witch, Second Witch)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4218f8b7986134c6c8bde7346e9c422d4c1aa024b321e24a19c8161739f250. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302101 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Chorus. "In Our Deep Vaulted Cell" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d49c06a8029bab90829b84483e26b1109d829bd019fea917fb1d7064519a0b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBAYC0302102 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Song and Chorus. "Thanks to These Lonesome Vales" (Belinda, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f37eb4ba8312a16b3edef57f6b2d692707130c3f4eba0c9fa6ecaaf7bd6f87. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302106 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 2: Song and Chorus. "Haste, Haste to Town" (Belinda, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f6d2e143ca515f97462b2b0ff8b15dbd61a3592f0cbd2ac9244c5bed4afa0a. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/GBAYC0302109 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 3: Song and Chorus. "Come Away" (Sailor, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaeab426281b6b89d1ae91fd99a9e133f9cc137c56bb3c84b69d92d839e62aef. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302113 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 3: Duet. "See, See the Flags" (Sorceress, First Witch, Second Witch)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485fdb71110e1eff5063080667cfe359c9687b42b4dd8cbea85dbb2adacdbc3f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBAYC0302115 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 3: Chorus. "Destruction's Our Delight" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7a1045faff3f9fcbe39062e77fc24629b0760de04e65d2aa6699d8916a0df0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBAYC0302117 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 3: Chorus. "Great Minds Against Themselves Conspire" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959c2f26874bd0148cde7ecd516270065841cf83ae26c4ebb6e838658957c66a. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0302121 — a six-check JSON result.
Purcell: Dido and Aeneas, Z. 626, Act 3: Chorus. "With Drooping Wings" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b723182e263601e01e9229fe0241316a199ab8e2fa8142dae88664cd5b3027. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBAYC0302124 — a six-check JSON result.