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 0x36ce15b8b130cb84fd323d9d9fff3b90d927871dc306c21a20210a9c59b13052. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c30a104c-dd5d-4028-82bb-4203b6e623eb.json and https://artists.proofprofile.net/proofs/artist/c30a104c-dd5d-4028-82bb-4203b6e623eb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dido and Aeneas, Z. 626, Act III: When I Am Laid in Earth "Dido's Lament"
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 0x7070a4def02ad59ddc9b319c94d98f02f1838405f4eeaa0057e3ab47046a5dc1. 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/GBAJY9401505.
Purcell: King Arthur, Z. 628, Act 1: Song. "The Lot Is Cast, and Tanfan Pleas'd" (Priestess)
Purcell: King Arthur, Music for Queen Mary, Come Ye Sons of Art, Hail! Bright Cecilia, The Indian Queen, The Tempest…
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58da136e422ca3f8ab49e3ed81ad03d074f8132d225379114927102d3b7e236. 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/FRZ208302308.
Purcell: King Arthur, Z. 628, Act 2: Song and Chorus. "Hither, This Way, This Way Bend" (Philidel, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7575610187e277eb38aefbf6e1929259af44f62b04061818f087771a969d4427. 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/FRZ208302312.
Purcell: King Arthur, Z. 628, Act 2: Song and Chorus. "Come, Follow Me" (Philidel, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f7195f016c54c9ba8c1a15772741d4f22c138eecfc2cd2bd1f00db108efc48. 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/FRZ208302315.
Purcell: King Arthur, Z. 628, Act 2: Duet. "Shepherd, Shepherd, Leave Decoying" (Shepherdesses)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74209e7892d5661dc4e8cef4b3bcef0df5cf8e81453c4fd6aab15f31247ee980. 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/FRZ208302317.
Welcome, Welcome, Glorious Morn, Z. 338: I-II. Symphony – Welcome, Welcome, Glorious Morn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e2eb963fcff1024833864e1861e6d2ca235b7ac2edc91b6642498119b17f24. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJY9401501.
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
Raise, Raise the Voice, Z. 334: IV. Mark How Readily Each Pliant String
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e798791e59d258d2ccb09564dbe22dbb4cf3ff863959564d600e56d18ef5dc. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/GBAJY9401513.
Purcell: King Arthur, Z. 628, Act 4: Duet. "Two Daughters of This Aged Stream Are We" (Syrens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884baeb959dcede31bb98d11201f2d90064437258dff1cd9a22855248fd3c0b1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208302327.
Purcell: King Arthur, Z. 628, Act 4: Song and Chorus. "How Happy the Lover" - Duet and Chorus. "For Love Every Creature" & Chorus Trio. "In Vain Are Our Graces" (Tenor, Sylvan, Nymphs, Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7be9d0dd7011daffb67744723a237577f44807a14d3e92047a20664e3e055a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRZ208302328.