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 0x7e0e6f6b0501331296cd3759f9f35e040f039e744fd86aebb0f6ddbda8f279bf. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45240ca4-92e4-49cf-9e60-568a76664c7b.json and https://artists.proofprofile.net/proofs/artist/45240ca4-92e4-49cf-9e60-568a76664c7b.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 0x886140899846cbb0b1b19c66d68b9671cae78f181a7c281eeef27701438cc7e6. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZDA72140457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c3fe1647854a85b5333deac777d1f5584221208172c530fdd0a05c77d4bd26. 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/QZNWS2125385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b154c6916c65e1d1228dfebcb65c29574e5c77cd435f1b1f5b721bf344f6e6c. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZFYY2219317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715cd0c4b6380d978bc81760e58d6570b6cfb8c7142be540897eb20c0bc43ed0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZMEP2248814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb78cc461b0e59ac53110e261fa5f0658ce2bf754804e2bd7115f24bd401fb4. 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/QZPLR2244547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d36ac4ba455e5734d6b64896b71b38475b850302ba4879ec076c8b51d6688de. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTB62254229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c86fb80f4fef36c47b48492f69418dbb6519ec60c3110981f66a3ab5341695f. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZDA82396473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3698e48de7340cca8e08bb2a5fea40022a94af810fe8d0f287526bfca0e6200b. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHNA2349804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2ea5127dbf138d5ddaca2e48aeb769fefc7e18f502e560bebf266f4bdde11d. 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/QZNWX2395728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb55c7dd67de6d2f4c22134de3e2d9564a2b2ddb3e1fdde2d00611c19e6d9553. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTAZ2379099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb765429798c6cb6439a116a981f6d5f58ec7a2de0a6c7574f38cf9f79197f6d. 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/QZWFS2325791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d992abca319b9b68361838cdae33c82b3b1aa927d2d2522bd0aaae47015174. 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/QZWFS2325792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296277fe15ce80d025595c055b7d3efb5b880f6c2a01a3ae5a20f56489d843e8. 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/QZWFS2325793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676134c247ff6784fd62161457f416993c613be3d332c0a0ad3f26bf71f2fc0d. 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/QZWFS2325794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2ed9398b82925955d6a89bf19419f793ddffab38df785297219144d9b86fd6. 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/QZDA52437735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef690984ff01a82b270f7524b826d3ad756c2029f5a7b315a2a4fff4e00a8260. 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/QZHNB2475104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d95355ff266f6fcd069fd06f6b990344085253c09b998b0fb2edb3c3d789ee. 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/QZWFP2466280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5cfa59849ef08adefd31512ee1bd507999f242f5c97d47e027722572e8fa6e. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZZ7Q2412916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6606ab96a953f106a5c83b152509373626cc7e322d2281f5629439b5008e5dbd. 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/QZPLS2541614.