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 0x7f3aaf8d7d557df92ca58f394e5432da3831284cbc2d38b7107aabd0624c1014. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c733bb43-2ffd-4bc9-9c5c-9c6aee22b66d.json and https://artists.proofprofile.net/proofs/artist/c733bb43-2ffd-4bc9-9c5c-9c6aee22b66d.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 0x6fd3938b06029dcb3d34669709f0a00312fbb123413561363075fef5b444abcd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAIX2434224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1829e322c33d0149b3ca224c00e921a6bf3f6f3799e066b791e33493b23f4b80. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TCAIE2436457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7420a509adb5c13fe3da88ee22c4ce63ce9c13bc2bc63043c315afa5b26a9a20. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBRKQ2417489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3bf28f2cb93c27a2e478c528e7fed421f0fa1e6f829a395f9d9b31a94c1317. 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/TCAHQ2378979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e49099fdc15b436fbad402874571f1eb12ff29df243dd54ff8103ab7349cd30. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAHQ2379679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e9324eb36af129d213eecc43a07ff5bd5092445aebebb04aff1ed1ed240f75. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAHQ2379659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481956429378a8a28c65fb5160dbcceb9d6579ef97df9bad9e2cc0d557bdba0c. 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/TCAGR2287956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fe9e259458e2bf456f08a117a3cecda0370aa4b186df926cf50aa44d87689d. 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/TCAGO2284624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36842066ffbea70a58d89cc1e49287067ba5d7defaa0dde3271228e43342d5c. 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/TCAGO2229826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf667d8a50b9437fa69703bab56810de1cc1096bbd9d11529f05c02f498c2f473. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TCAGM2261407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b691db5c5b27be9f0739495d3e12099a25205ae701c8491debf0013bec22d1. 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/TCAGK2239025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42dcb3fae86263050acf02a158fc1ba13b672223316390a2cf289296e34ff85. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/TCAGK2239049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda58efbceb71d9a85c4beb91dca5c022259b33b4d4e4f051f331dac5523eea73. 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/TCAGK2239056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d1a1797411ea357e60a6e8b4bf32d7a558b364f849be160b8118341371e52d. 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/TCAGK2239060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72a17851f605b89b043f7a7b84aaa29a75092617c6d61305bcfa6d9df4db2fb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCAGK2239066.