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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe626256547f9f9941020be516de472bd3fcba4f4785b8ac586cbc3630fdca9a. 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/5fcb8d9a-7698-4f2c-8f20-5d2a11744873.json and https://artists.proofprofile.net/proofs/artist/5fcb8d9a-7698-4f2c-8f20-5d2a11744873.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ffbbbed55c0286567f1ffb8169c82fe38a2d875844c3264d192c4a9f2b806c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM42K2369096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d91946750ab5bd0f5948ba34f52623d9d5c652f8c3420132d1ffc3eceb7722. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZS642345868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3173307107599860c04f80b5d49b77c8cf71a98dafaad5fe3d40d1ba6d2ec06. 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/QZMHM2361837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebadbc5106493acf4ad796a8994b97b0220b53776b8b076aeaeeafc24bed9dfa. 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/QZMHM2392109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8754a1ac22f1d1fb86945e8b3328d413a5204f0d9fe7d9f7c89c620190042f0d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMHM2388577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a68c53f84ce218e4dcaf6abccfeed4ae08785fdaaf305ef4b8c06d7f905a29. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZMHP2362780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bf4ac0015048c2b2fb824692aced101c99358da204f0fe6c8bca6b07c48ccd. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM42K2390435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72287ecc7c3ba0140ff21667b07fe3bc5bdd3405b01a6f7e4023fe7daf3c0a13. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFP52126434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9b5c4c9d16ede2b3f7a881ef02d21a509565ac38aceef5f75e9715e88087a6. 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/QZFP52126433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77c412e8cdb2c353f4b2e7b68d75cc560d41af83b14bdc8d1d3f99f8a19d092. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLCK42238931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5beeb14d9994561077b0f479e959109e602a3c34198219042a7f9855c8b3c080. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEH742418076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef0efd748c483e218a42890e7921b2161c748910fe172f1ee8c364c93b26825. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEH742312830.
Khazad Records: Various Artists Vol​.​04
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5985626891f3e43a698f7604711de8c53102ce4409040a9a2d252f99732615. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2249677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a1113bdb5d45b21e7c0536b3e784a7f866a8653b8dd6c416edbcdaf17bf4ae. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMHN2337284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2280398a72a9b7bebf06051942cbbac928e91fd9b67d010ec35a6bf0ac8e30fe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEH742429808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf11100650e0f4a168d307eb0389bda381ed2c43cd3e743864211493f98b5b6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CA5KR2373279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0205f2fd791074ee4550159d0270a7dc7022f2ae9e9a3242eb445defa92a7aae. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZRPB2172681.
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