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 0x3524214d09dd3e8ff10e99593adf559aa6483c2852d7b7a7813e1558a24011b5. 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/a9ea6b38-aa3f-4e45-af0c-1f39f5936cb5.json and https://artists.proofprofile.net/proofs/artist/a9ea6b38-aa3f-4e45-af0c-1f39f5936cb5.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 0x5ba39561b64445be19b8046ed754aeb8631aea092823579bf70c6efa2f1a2e4c. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/ES71G2132913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f42ce737dacf61892206b895b1d1bdf0d8959643927de559b326017a2e6b131. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/ES71G2132914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf277d26d29370851f6ee6d80e88dbb14a164ee528396585acf9f6d9cc0da8ca. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES71G2132917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb500df971c11baf66aa892f9808264790d62d176c296e85ceaa843d452ac9ad7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES71G2132919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba39561b64445be19b8046ed754aeb8631aea092823579bf70c6efa2f1a2e4c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES71G2132913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf277d26d29370851f6ee6d80e88dbb14a164ee528396585acf9f6d9cc0da8ca. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES71G2132917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb500df971c11baf66aa892f9808264790d62d176c296e85ceaa843d452ac9ad7. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/ES71G2132919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f42db55da414ae9224521e0df6b883a2654b7d41a93939939538d2b160104f. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ES71G2132923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39723f0264565c763db3e565df76dfa598d8b7d700b26f168d7d41c8399a5912. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ESA012290274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a75d557ef0680501c08456cb277717507f53d7118b142c9cc74529871571dc5. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ESA012290282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e070096293c9bdc14fef1da6529453987df011f709c301ad612ed98729776a. 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/ESA012290290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071bcd7e67c41f75d1b2da171934e3a49f58e8a8068ae82d9ae0952c7c63d076. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ESA012290292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aff332b702e589a139f9ebccfef7262b2455542fe438ffbcd39d43ac27fe59c. 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/ESA012290293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941e2b876affc33fa454ac89882167e6ad9e69ab0f6173d1b96c10acdeccea47. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZN882445192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e59725f1064ed8622ace15af42b31f2458fac8d0179792bc8674fc28461d71. 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/QM4TW2029816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc5b19852559ed5a4fb3b7b4c1610a37cda245354662c3be577c181e5a571fe. 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/QM6N21453864.