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 0x2350cb90f7d45affe50634e1803e27a3c37356627b4fa393a1d60c86ea175a7e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b680f66-525d-40c9-bc30-b1d0d8a82fb0.json and https://artists.proofprofile.net/proofs/artist/5b680f66-525d-40c9-bc30-b1d0d8a82fb0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xfb77662230968fc587b19a03eda66909dfef794629d1a2b23ce481bdf2b21bd6. 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/QZWDD2444435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb4b0bd48b670cf14acfa43fcd1b28b3096237a8a3618b8ce1a354d69639838. 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/USLZJ2417650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996ec481e781a90c2f360d2be99a4e9dbae5c161a74c95e56f59e5eec9532e12. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZZ8B2396843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9977dd5b397c564ee89d92ef62812f3bb21de602a758a9023124d33a112837f3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2382801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a0d541a8d9f59eaed063c3e43a8d0f0c587d693a11d10b02561b6786ebe474. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZWDE2301723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15fd83e3699f1d19b2a93f1412d5334598d98c6c8dee758fa9cc0814f042ea0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTV32396685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa963bc74a39f3cd517221332b1ec81472265f8f985e95c26e4f126f6f3effd2d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTRX2319916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcffb6f7740ce7c607ca5e6d723b92a3c7908e0fd1d302c7cd55ace95938a893. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLZJ2387379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1caa4e6e5f043fbb53bf438d64d9f2b4f7c4c05742fba326607db384db4aaa. 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/QZWDE2258661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0792f378329a3065531e595ff2dd9e4d96dad13cb8932228facbc2d5b81b17d7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBWUL2280001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac7a0611efc0e3c8fccc9b4c62530fc4882634e973399db8d265df3c301ce67. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLZJ2278331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9953167f5ed660f80ffa09cffcc2154259e0ab112e1319144e7ee9511162f516. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZEB2440090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe4e34d26a112946311e2027196ab41c8db7700edab0064bda32835042cdd6c. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZTPX2484753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd481c1c729d3412791955e89c627d1d91c918d52ae323e80e9bf3c527f27b36. 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/QZWV32454728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2e7593c2a07832d99a1ae458deb6426c450a5b25834823bf0eddd502f54bbf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBRKQ2490179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b59f37b99c4b5cc7f323cce26caa2247e5196de0ca04ed5d538edc8f9931b60. 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/QZTRX2377645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c0371888fc3747f5d764ec3c637cda09f4eb05352e138f2482bdd20c4f3308. 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/QZ5FN2236412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746f41385d5068d8be09c4013f92e9641d92db8931155e5dd971fa52372b738f. 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/GBWUL2146324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460f60f4f4e655c77ef1948c41869533b4939e3e5e3421e0c19f18598913d4e5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBRKQ2173922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b36e1793d095b62af429d6d61c349a5b39452130d5d6198b85b3a859c6bc39b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH6542107026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecfa7058e2da8a922f2128c3f31ae49d3f3c50668b122db3adf0133ed798e6f. 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/USL4Q2355147.