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 0xbd90b40c88da60717b51d5c539afb9f446739d5800bed5a5731c438d7cac7014. 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/86e48e2a-d372-4bf2-be0e-d2f3df3c7bb6.json and https://artists.proofprofile.net/proofs/artist/86e48e2a-d372-4bf2-be0e-d2f3df3c7bb6.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 0x298181920d3b0989836bbb7a3c61fbc7dc3590960ed73a39eab3c7e18373ff9d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SE6A92104907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48723a62c58795d52fec26d51a6002ecd10ef7fce0d9b5bfc8a4bc77462c85fd. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SE5752164538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1f37c8af8c9cd8131ce90c62b5a033ae1363111ff79957c8581ecf03f238d3. 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/SE5752210350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931269274e484ee11188b07c651d4f282718d6e0b8e49ce2be07517c64cdf089. 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/SE6HN2228580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309f61e9d4ecdb5ca00f37aacce92fc2d3760c0d26aea86e8805579ca6b1e46f. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/SE6HN2249388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc12a769c2a8f4f801dc86237b3bfb0bba78aec058df275ddbfdcf5264d547f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SE6SA2210103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fefbdc4553b708d2b4eeac21023009c12aa2e93f5be56623acf3f0c92978800. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SE6XX2227993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0747709c35b1ae71dee639ece844cb33eadd40decca3590807b82f9cb3cbac. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SE66N2316572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2add415494304b2898b66b2ba51c44c934c0bc26cbdb60e2541f87ae9e2a4b. 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/SE6XX2395562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0031de6e2efeba4948fb1ededb5f8a1789b92097057e4aa80ae3a473eb8e3469. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/SE6XX2329658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e402c0e1f2bbb863031f68310d46b8e3775129d3fe9b5160711c65750ea4493. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/SE6SA2303970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b29e7115c32f12f32a1ca4245f89383c22496908341bf9365763b9ddff66faf. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/SE6SA2315070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab0b4e57aaf0a851a7eedfbafc08cbb025cd810c146149fb2719b7814f8d090. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SE5752419989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1874240a43d83b20edfc30a08f54f03762d0d3ac8ddb38ace8e17fff3d1b818. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/SE5752419749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239a838f745eafeec31e7798b6c7712969eaca3edc4bfdff37695ce678f7c2a6. 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/SE5752419732.