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 0x56843531e5c06244b101269a2b9f89021bec8fe54164f89da6debb20cc578124. 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/b469f80a-8fe5-4d60-91a2-1b213d982a88.json and https://artists.proofprofile.net/proofs/artist/b469f80a-8fe5-4d60-91a2-1b213d982a88.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 0x5299256cb0c3f1b5b3e7ab2bac334cc21c07e63983bdf3715531f1f0d4843586. 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/QZK6J2006222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee80e0c298a3b679932340e20e2f8bbc96889eeb69b70ce7e60f2b6bf6e7a27e. 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/QZNWT2356156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032d96caaa548f2d2dd5613999fc5abff376a546ec17f80c62f8b846e8e6b0db. 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/QZMEQ2422338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadce3f8b7bd6f10f87fd2f706c54b6a48529be06a4059c68099a8b87bd483e02. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZHN62576722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ffb9db84e298fa26ef9625b8240ee41eb65eb30dbe72df555bfb4ced290766. 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/QZHN62576723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92bfd3939fbb61e66da24c69fbf36d7da89d16fe17c64c6328175034cbc6f29. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZHN62576724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068acc10b83829b4f49ec2935c5f8f374fe5b8a4f6c0c26c113ac700b00803ae. 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/QZHN62576725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86adc92f40f10f452deeba15b9470e5e99e855f79125a6122f22e006a94449bd. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZHN62576727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59837b6985d44864c10ba44b9a877195a582829d1ddffce0f37d38d83107a174. 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/QZHN62576728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c090634d67ee239fd9bd7a439836503b2b9e0e2e257b6879a74e90b86af3f90. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZHN62576729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1221bf10ab18f7963ec48211b84ae394c4517f00191aaf41365ccf0c2c117f. 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/QZHN62576730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9a89d17f9540e86134a24f25810b1a19ecd796a619dc11ffd6f2d476318c8d. 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/QZHN62576731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a3b998db5e777f0ec154d5d2b6cb9e9cabd7e49d5764a586bbe9d0a1258eb1. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZHN62576734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc369d634e55fdfb4313fbc9315f759f7490b66f1c274e2a39c9dc2a8c5e208. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZHN62576735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2991ff3caf224a92352589e72eacd12cd7451b86622a255cb27a36fdfe64cd7. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZHN62576736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbe1ffaa8aa4186af32359152c921c41beb0ed409a1a6fce4ec70695fd79626. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QZHN62576737.