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 0x0ee05c55f21c0fcdcfa577d2af0dad527837ba2dc3c85238d0ab7eb3519dfbc6. 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/b93abcfd-e151-42ca-949f-2c4e0708fab6.json and https://artists.proofprofile.net/proofs/artist/b93abcfd-e151-42ca-949f-2c4e0708fab6.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 0xa77113d94bbb171aafbdda28d97421bcd312f94e12a306cb9ac4281d7b05d35d. 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/ES64E2200257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658acec3af1b079ad3cee09a389337036ba74b7fe0603b102bc33a688b6424dd. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/ES6172121114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2451216bbe41254222a02e48c3f0a8bb3b4758dc3d542998c671a8e6ab3dee7a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/ES6172121110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ff909f464771140489e1cb2738efb14c99b981d5653bc3cd0ce7682f0b9fc3. 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/ES6172121111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e79b86a8fb7fd1c27d2364bb0f0a8a16d7d5af56af30af9cc2906ab846eacc8. 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/ES6172121115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe611bda50982190839c976f9052a39f380188aa5f1f0d9a5bd6edab378035e3. 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/ES6172121202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647cd1ba89b434dd5d2c4d76e6a76bbc71fe56aea6ac76d60a1266a85acfa6f1. 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/QZHZ52207120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c9562b35ca29697a938f8d40f7731dfe9854a1010df1098d01e035fa597689. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNJY2234602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d01cb11625540f1179178a1ed95102de797c135145c924b81bf1d111334051e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZGLM2340901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59047b2cfa148cc2607f861d0f8511d470b4c9c27a73f380641027ebb63ce04d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNJX2393287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf1a4d62df92b5297d62339ed21d7f3dcadcd0cb2f27660816d36d9c489b5e9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZW9K2323737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2d81c51f250c9beb81a9730ec5159f9a50558f6590e1da242064712296c6e6. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZGLM2402921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76d79a270cd615e1c7a43e23dfc7cb15be6c20d5129b3bd14c30d5d2b8c45d4. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMZ92427547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6348374088dbc19ce5580c8d5e8d76d0c761524ba6f6238deb8cb262cfa369a7. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNJX2493137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab69b14861e5ea4b2739aac901670b10e8c0e0c2a499b3099c10edbef805c9e7. 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/QZGLM2500946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627101ba7065bbcd99cd2a066caee03a74d6d89a2e4d0a1e763370dc68f77b98. 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/QZNJY2530686.