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 0xb9e9ce582349b6cc2f1b3e3a72c4ae5b6348904edbf7aaf58aea0c3194ce16e9. 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/f0968073-3291-46bb-985e-0dfb20f0d4a8.json and https://artists.proofprofile.net/proofs/artist/f0968073-3291-46bb-985e-0dfb20f0d4a8.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 0x41779b6e6621320a3f497b3826892e12cb56a7abf3f112cd6b4215e9862f0b23. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCACX1790920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e93e79a6795935971ee53c70465beac50aa276b28fe501b90ffef096a59b5c2. 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/TCADI1725792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eabd7d36e3593982d153f74ae21b116ce55041cbf127fe21adff30d4d81c521. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USLD91717735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e494792820664325f526c587868536caf5d064a760f5458bc3d3ab374395fb9. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USLD91717739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923300467ca9e1228a7980070b943e532d19c6fe8ea87367a62434d48b187b65. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USLD91720419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc051ce336a3a4b4554bd2e9c6119d6da7ce4e73e2f9871a7004eb94b75e35a56. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USLD91720420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3580bc530b10324e326ac6d5cf688c3b40307c0396a51c3127760c0e2f53f4c4. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USLD91720810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37508795371441f8618eb3da34afe58a403afd059f1a65dca5316f516e2b2c8. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/USLD91730301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79dd8509c4d2cbb7130c25e5fd8dc8c9ab10c60cebdd6b648ad6435a3f04f02. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USLD91730306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8628a8241b3f3bd6e7c7102f0fd190580a14df735befffbaa98fd9625a0326ca. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/USLD91735198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80d4eb61a383774038ff929a8a9dfa4a3c730acc71424abbab15fa849d5ff30. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USLD91735199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e397aa00e797a1361775d69bf0b71b844290a470a3682eeed9e253493b049dc. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USLD91738090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7eb0d257a00fdca19c6710824a3a0da880b0c02e4e3b03eaf67bafad32b443. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USLD91738091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503bd3c0b151b6051cc32ac8728b6d5ae4dc75a2b4277406485675edc13e5e25. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USLD91738092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed4eee36b48c5b5e96e77482b8c59e87642a51b5eddf979a3b771fba7ce2bce. 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/USLD91745182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c6224406d9ba27a4a697537762b3d18a899ef640fb4e3e697970eebbb68687. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USLD91745185.