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 0x6efaf122d17a251ae6361142d69e30ef92506f53b21617102bafa7e77f7b2d9c. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8350a4d3-d68f-4db4-868c-5c5655d99b1f.json and https://artists.proofprofile.net/proofs/artist/8350a4d3-d68f-4db4-868c-5c5655d99b1f.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 0xd5e781a78d6f0403f7cfc359801262690ec6727a488e02eba7c0e7c458f9c2fe. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/ES71G1925738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53eceaa843f3baeafdaa41134245fa0bba06f40e66e27addac8c516ef993fc41. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ES71G1925735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe449ca130cd70ab52645249468b741c7286b007cb198a0f8ad6aaf52980c951e. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/ES71G1925736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779d7c87c7c3856f0be93c8641a7c9cd827e2911ad3d001189229a65519eba1b. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/ES71G1925739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb89bb07bbb1080e4bdf61292ab14c178e72e6678ea2839668cd9aa9647bb91. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES71G1925737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb770494563bf2ef556faeefdd756aef66de24a5ac941c1e1bafcf355424a2574. 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/ARHXW2001500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99df6cf0df38ae3670042c0579393f888f34b404366c5e33eb3046e83986acc. 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/ARHXW2202174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca0d733d314555b51e8751f7fc06e5ddaa964ae8e6fc85e19af74ad9df89239. 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/ARHXW2202175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03aab4813b79589da2a23421784f814fd64a2d7885fe03504253572fe0dd10d9. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/ARHXW2202176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c183efaf3be05aad6e2c3158b8fc189f828678c550e0f9c198c26ee8cc6f37. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/ARHXW2500094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32c7ff79dacc3bae9b50f3c29c54dd35ed5809d6611349ee5bf87f6afcf2265. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ARHXW2500095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235be8910910fc7726e3a1e44272d899b4e5d94afad83776973c2d5f69eec5ad. 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/ARHXW2500092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0ef281fa2855430218de5b0f1d5b116b18954eae9aa0f532719d7df47fd336. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/ARHXW2500093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7694a1ece489d77bd1e6670ec891bf6eefc70399f7e8fcef865eb251b9f52ba. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QM7282562950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274573b709af7b485e7d3e93395fa3c423f17986c9618fc4a7e4241d640916a7. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QMDA72584833.