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 0x6c603892ac3e2f7dcc8ef9b0b1786c5c1e385feae9b9785fdb19fd2f8b7d30a1. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ee2ff75-acd4-44e9-ae9a-352a29f3690d.json and https://artists.proofprofile.net/proofs/artist/6ee2ff75-acd4-44e9-ae9a-352a29f3690d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Trial by Jury: When I Good Friends Was Called To The Bar
Gilbert & Sullivan: The Mikado; Trial By Jury
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 0xb7384acdb98b4b1639420d453f802176d2029e58d56fea6e60791fb4f29ae868. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077443104 — a six-check JSON result.
Trial by Jury: That Seems A Reasonable Proposition
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39da118423d7f99260cefed59e71f7e83948c1db4b4623deea162cd980f05966. 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/GBF077443111 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c505be5ee16eda990914b598edbffd2e0cf42046e78a523f812056da9b876dc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077443112 — a six-check JSON result.
Gilbert & Sullivan: Princess Ida / Pineapple Poll
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7846efac127cf4e75b87ae17d3ff6b4f228b2ada0f5c272cebd8facd6c895d2f. 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/GBF076542006 — a six-check JSON result.
6. P'raps if you address the lady most politely
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5050f7654ba7b7af896056d0a7b4ebe2db43554817e56680b1daaec96c435df. 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/GBF076542007 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2982f1a86e4de239cef7e9cb57155966d6f166f39bc11a398b133dc082753f4d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBF076542023 — a six-check JSON result.
H.M.S.Pinafore: Now give three cheers...When I was a lad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb48fcdcf008775ea2e6a66e5cd968376fa369b5a39714dbcb89a62fee47abd. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBBBA5950100 — a six-check JSON result.
H.M.S.Pinafore: Never mind the why and wherefore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db174912427c5cafd1845a847524af88e26cd5501135938fedf8553458d3067. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBBBA5950110 — a six-check JSON result.
The Mikado / Act 1: 8. As someday it may happen that a victim...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db3f4273de9f27a2e578f4f2d14363dbd2d99a70715a3a1a578e1014db41c11. 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/GBF077340109 — a six-check JSON result.
The Yeomen of the Guard: I have a song to sing, oh!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cb9b663f732115a9efd4d46fd4b6788e360d4846944ed893a096801832c229. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBF076440208 — a six-check JSON result.
The Pirates of Penzance: I am the very model of a modern Major-General
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe314687525be01800395f891a1baf5f29c31f6dc13bde755733814c117ea8c2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF076710681 — a six-check JSON result.