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 0x01260d43b6887fe7f8c3563d22f00fdb6d07804de75208b68eb1aa6ed79523c1. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ebe280e-e260-4b45-9570-723a6981550a.json and https://artists.proofprofile.net/proofs/artist/1ebe280e-e260-4b45-9570-723a6981550a.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 0x993f145c558b3893cf71fc97cb12ad9b96477b3b4f8e2417520bdbf020d5a042. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USUYG1380714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5841ffa3885199c17fd002b4761258a04a3f3b11a0165cd6e93e691892a1f1b. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUYG1380715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b463fd586a8a15675de6f7256926e8c88776dd9165de76e14453baeace34bfe. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USUYG1380716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1fd4d5d90885cf8d84462598b49522930fa08ef810151b22803bf2e96032e6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USUYG1380717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9304726792d207291f5c8a9879ea47693b75ffb055fbe558a073161cc6847b4c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USUYG1380721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85e8ff45857a57a905d3e2d8961686e9a45a4400dda98684e510e58454b3afe. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNJY2481112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e976d128db42598f5e25e570ab43ac20496b339f79b5f164ddc64214a68a267. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTVM2472132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4802628c03f547b6544f50b5a107f2b1370c37b45e7f14459174b4354f95b591. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZW9M2425535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f94c0c786403704233a77d2b3617dc1f40aae0fb6ca479fdc212aff90af323a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US7VG2555317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907321ba6ba2664fe4175754d08508148c5953e037512639ef5f1cd75f344d27. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZGLS2513418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85e8ff45857a57a905d3e2d8961686e9a45a4400dda98684e510e58454b3afe. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNJY2481112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0a0165a38979e640269b58a811b570030aab72513a1ccc00799d2b0c863214. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZGLS2513420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e976d128db42598f5e25e570ab43ac20496b339f79b5f164ddc64214a68a267. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTVM2472132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3978005bbec134b70b2405d5d7f7d6e9514bb2235763c840806d07ce3b00f54. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZGLS2513421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93dc6ba7c75f311a10a695af791379d6380652f8ee7f91485f2d6628d66289d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZGLS2513422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f94c0c786403704233a77d2b3617dc1f40aae0fb6ca479fdc212aff90af323a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US7VG2555317.