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 0x48d0f1c1864e06bc87334357a812ffe43362463d6bffa3cc342b7dfd714472f8. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dba8b0c8-22b4-4801-a9c3-7a7213ce7557.json and https://artists.proofprofile.net/proofs/artist/dba8b0c8-22b4-4801-a9c3-7a7213ce7557.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 0xaf56419b57a128fadfa3b10b07f6b4eaa342ee57d9fa93fb0b193a428aea85e5. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZES61985351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceadf232126fcd4df32ed0ad43d45e3d42468b646845fd3806184a5bcfdf02a3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZES91973089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b553bb0c22b4992095d65871c8ea83a8c5649f3390947475dcf51639758293. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6P1934501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59b94d7254dc03c4457399a9193bca8eb020c795d346d169668baf3343480e1. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZDA62030666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09f2f9cdd6cbc0969874a118fb7b1e67e18caf5dfb5a011cd2c713226768172. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMEP2077238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7764da1ca6cf5eaacdf9b4f040b73503d577abe72c3e85074ec135a26d3b91d1. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZTAT2409506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a23fb1dca9ffe318ca6470786112e7f9c7adddeeac26a97329fdb69ae60ce3. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFN2529136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afd1ee8586d823f524f33c07df81f8407a41555b1c911771d2f1192b83fc6e0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFN2529137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cf21081a76b6327ba115bdffc241483dce8fe93921175422d6dbde82e462b4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFN2529138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602ad8eaa06a1dcb251d1a5540a763f20440d938a8787c0f203a66efc03ef42b. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZWFN2529139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09efee38691e1b304529dadfa38b37b09c7e25b92580258461bada1323ea340. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZWFN2529140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f610989d0155af66d0fa5c3033cb037014b168c847910efaab3faf39a8c29dd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFN2529141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf0e11498340d33b2d437a2dd2750d6156248e3ffb534e838674f71d9e0607c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFN2529142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95574a06c4b03e57a000efa1d3c2761f9a5b6c7a8da53ddd0f6a1f4176f7776f. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZWFN2529143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d67cef2511a4ad10161074c114323f566a922bef8b18ec5dc4749f77bdb2e0. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZWFN2529144.