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 0x3eebbbcf76aa117228470f2925c73dc6444497a8bc9da938e325a00a7e6bf90a. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/999bdce7-be39-43b9-9d1f-87599fceec0c.json and https://artists.proofprofile.net/proofs/artist/999bdce7-be39-43b9-9d1f-87599fceec0c.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 0x0efb0c65d91743e962ee0786846dbca480933e5a28111154c2d3d000f6ff20ad. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHN72587739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead9641aa34d8584d1899469acf8fe5f0e7401d5c17c538f7acfb3ef3beadafc. 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/QZHN72587740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a74a5cb5b7ed3702cedb290196269272895eff72a391e5e9492c5a342ff3921. 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/QZHN72587741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c04afe0afc3d62b182844b162708d464217319a5dd7f7fa7a4775f7921325c9. 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/QZHN72587742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac0510a507db133e959166fa3cdd6e6540d54994c9da440f6602512d855a024. 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/QZHN72587743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8867a9ef8c7d76dc03e1d5598a90f4b25d929befa10727a44506009029fe93a. 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/QZHN72587744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbade25667214d9c9011cdd9e347355ef789fb2d448eb57e8a7672e588e9e06f2. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZHN72587745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4760fff15c1c423f720bfdb0b3c11b809292d3803d593831d171636e3e3785e. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EX2431103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7401118a1907be6341b63f1e1620187dc4dd9984807a92e86212454fb9e4fb3f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHN72587747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec40d63778ef6c43bb903a65469a320b99eda6c682738317563b03098c2f0e2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHN72587748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0167bcd3870677c082bc3830deb7e754e0ec3292a930dc988bbdae9cb1865f8. 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/QZHN72587749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fe594a3575f669e8e3af72c79ecca8cba81ee40d2030d55ab7ce53a22dfa5e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZHN72587750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0db898432c954c037f732fd660079e4aa716ba7b308275eecdc10ab3650014. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZK6G2563214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b2de417d238d34feb7f1bfe8c017a7f201b2dbdbcb7f380961bd7879440990. 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/QZTB62542694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910dde8aafa21904fa1ad3e586c830b52689811a3b4d72e3821c5f3dd6bf9c5d. 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/QZWFJ2557830.