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 0xe1f9f4caf726ff6d84b3bd22128a4d039bf6d284680ff8647d32d512c422cbdd. 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/c431a0dd-f9a5-4875-b338-f024814b352c.json and https://artists.proofprofile.net/proofs/artist/c431a0dd-f9a5-4875-b338-f024814b352c.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 0x9424e53506632f8d2b5161238bf781cb29d7f7284cb79ebcce909b7282fa3e9e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBLV62316347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9803cd4cfc11bccb7d8c3d68751bbd10fc2d7e15daf552b3f5fccfac2ab6ec1. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/GBLV62316348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314d662750f3f73e3dd2e3bbbb21a83b3a938ed072efe6f387670db49babfff7. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2378775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b509f3293f0e530fe3714758a7cd4a3f5cf58c92bb875395dabc3ac202f08e. 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/GBKQU2378776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b068fa7ced1072f294adbfc63f372e8844d0e24f95d6402c6b40189aa46a50. 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/NL5UG2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dbb627dd480e3460f5a460b7c06b0168de4fc75cc048aaedf6348484e4f910. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/NLS762300267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd64febdf3186aa7872fe297dcd53536234213fa7279ee2c524a7c527282218. 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/GBKQU2307351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff2164a38d8b8ed7711545c7772c4426cbf0c02c9fe6b5e99d2cf7e297694c8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NL5UG2200045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d35cda49be10cc5955e2e9e6c10365ed6ec3f9c6ed51680ad4a4f0aba51b160. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZZ8A2366155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ffdd985d7588b3fcf391751a3a6c96ba797a7d3f69fca0f4c4682e91b2486d. 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/NL5UG2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366da7f542bff1c0cf9aa8c38c20611996e985ade899f1adbe5b648d471c994c. 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/UKR6V2381821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecc0a2afd1fbcd8208e4b121db36c24ba98c20651097c3306159321e2320af8. 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/UKR6V2380602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12100392b3118ce442bc2af4545723bb3e65145a29e12f0b916d11c7c2af5112. 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/NL5UG2200091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1967c9ebecb654b41524def1afc29538bb0fc2681abb20c8dc9b4747ffa23fb6. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NL5UG2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab31cd27f2838f34f589f3372a1727abdbce48e4139f9fcb266ba9f3a9690f13. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITXIM2200042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bb597b4c9cfb06e51037391e2cccc4fc8e13a25cab0026572cbaee8aef5c57. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLXS82000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3639340ccb2afbd2b6d2abac889372530e381930c149b0ba93b5b7aa017f98. 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/USA2P2477722.