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 0x29627aa537387bcc50be96165b48b2cad523eceae27dcf46611e1e852f3140c3. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20994d9a-13fd-4e58-aaf6-5d18bb1dcc3e.json and https://artists.proofprofile.net/proofs/artist/20994d9a-13fd-4e58-aaf6-5d18bb1dcc3e.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 0x1566b244da36481e52dd933ef769130abdd49f47c1940e3579d9791aad3795c3. 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/FRX762124424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f1b8deb90b38851f6892ae14898b8ec49c9589ea5af936d2487fbe53755c91. 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/FRX762124427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0754ec95d7d1ea63c7a75c3d2b33a1ece9fe797558077f3c7d6f78f5b82447a2. 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/FRX762124434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6becf0c5112eec672303b553338772f394abbeb4a5dfdef0aa2493765931cf1. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:49:30Z), 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/FRX762124435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df1bcdda9454778fca4883413c87c132cd665b7020391f1e9b54ba9fd06bb74. 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/FRX762125172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123b4ed5b92b7968be025383955594a609cd1bd108d16e6dff13a7d5c592940b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FRX762125174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c0a898a02abbd7e1e921272635157f96bb6393f55a2edd05d2e890c05ce9d9. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:51:09Z), 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/FRX762125175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3675f27963cd3763aaaecd84bd5efa57fba932d337b3ad2774ccfe2d677643b5. 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/CNF182003640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd881f1ea93e1222ac38bcf06cd28c01a49e526925f0f5a49694201841ec4b348. 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/HKD012373605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631333bd9d9f68601b5e5dbb3059a14982b4952c63a82a9525b10fe717dbaf0b. 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/FRX872156880.