thumb|upright|alt=black and white photograph of white man, clean shaven in 19th century costume, looking pensive|Brecknock in the title role of Werther John Leighton Brecknock (29 November 1937 – 30
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 0x113170e0a57a005135bad74526a9a8b0012787364c7aef408cf1a2300396c64f. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d2635332-4e58-4714-999d-c812eb7cad27.json and https://artists.proofprofile.net/proofs/artist/d2635332-4e58-4714-999d-c812eb7cad27.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Traviata, Act I: What a time to arrive at a party! (Chorus, Violetta, Flora, Marquis, Gaston, Alfredo, Baron)
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 0x5cf662c43eddf0c0023dc984f6301e15102a195bd1a2b16046042e7652d183b8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBLWD9908502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3c04e1c6237748a2ae98ec511c3a83b5157f988bda473e3892631b0a47ffd7. 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/GBF077742401.
The Merry Widow / Act 1: March from Introduction - Duet: A Highly Respectable Wife
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c163d0736ce86dd8a0c76429ed78ec2c577cd30e3e5105f4147a654d8dbd88. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBF077742402.
The Merry Widow / Act 1: Anna's Entrance: Gentlemen, no more
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6376a9accbc63cafdb15990985112a71c42d28e479057bdade42ff99f14d01c5. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077742403.
The Merry Widow / Act 1: Solo: I'm off to Chez Maxime... My very heavy Fatherland
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5aba56715094c105ae48251f31c9d24d5258aeb96b36034ce79bc01268a60d. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBF077742404.
The Merry Widow / Act 1: Duet: Proceed. One girl has almond eyes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdfc68912473b2029028a23972c66d65c2e2f28064c87ce765b9e8aedf8bc01. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBF077742405.
The Merry Widow / Act 1: Finale I: Ladies' choice!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef0d9bc2543423014c74a9c6eea89425d9287b590edbc82faf09c668f72bfe9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077742406.
The Merry Widow / Act 2: Vilia Song: Let's all now waken memories
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58521cee12df6ab962050fcf6a283d4c2e682656bccb857a610961167e373b5. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/GBF077742407.
The Merry Widow / Act 2: Duet: Such a silly soldier boy...Heija!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7d648c7c54b1db5bd29b026880d24a1533a1fba74d084e5bad51d2c4595d98. 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/GBF077742408.
The Merry Widow / Act 2: Romanza: Love in my heart was dying
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57b47d8bd31915e13b914e6372d5b625784028acfa5fd1920b7da36a2a6c6a8. 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/GBF077742409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb3333bfad404f7428d382c268fe5dfec25c119eaa44c4d5cd1a74147a79c20. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBF077742411.
The Merry Widow / Act 3: Njegus's Aria: I was born by cruel fate
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1fac1d99ada78e8e44ab71556a0b10c085855083c6b8eaf19318f7dd4eab45. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBF077742412.
The Merry Widow / Act 2: Cancan: We're the famous Maxime playgirls
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582bdc1f210b89507d33d9225514c47f2368ba1bad7bfd0c4b54c94d308512bf. 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/GBF077742413.
The Merry Widow / Act 2: Duet: Love unspoken, love unbroken
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d320b7da5522a275c4cb02c1005c34f34202b8d9f395b0bd5f54ea31f74739. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBF077742414.