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 0x5b85fc31e3986d067748d1b06eada6a8f6a9e31ae16f0aa1506c586653cff9c6. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b579cc4-d011-4c2c-8d50-a2e64085c814.json and https://artists.proofprofile.net/proofs/artist/1b579cc4-d011-4c2c-8d50-a2e64085c814.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 0x06055d470ce72c79d36c5ed6e03b6b376e005f33a10923e9ad331b179f4fa68e. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USCGJ2442512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca9b72dc2b5d71bd6177157ea2c197171cb3d3c56ec94413fd04cf2bb172193. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM82449326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e17fe0e98645a55bcd3bf682725f04b2b62f55f25b535f257c8ee64616ebc1e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USL4R2419922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173e474f938efcb1495b38396b113074707e87567d9595b00b08f03b867e97ee. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USL4R2475172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7075065f75b9a25af88e477100c0465680df2925f1de3643929e13b3b3e987. 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/USX9P2483856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b661d8ddc45fa558bf3303315ee556d7a92d727b8bd7e473d8685f52b4a7e4. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/USY242495805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97c9d728d188280ef011ff2de65794a7bd9679f872f56f29901fef14b0e7faf. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QT3TB2420629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bd9e4e126ec1de55af0e3b636b366b6dfd754460dba50a22a06cb88dd129e6. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USCGH2569374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedda1c9e4a09a80bccd6947220fe85f264bd908344f270b9acc51de2d0cf6071. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/USCGH2569375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2552e0cd5db93794cadcfe32d0f4ef5bae888754f844dbb1f5e7e6b448edea. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/USCGH2569376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f728a4236e7573326fd9258bde8edf24c2b16d0bcf22811cf8df8e242291b15. 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/USCGJ2500844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacacc47e388b302ffaa4ba958cfcf9bb20d077fe58c14f0f392d7069583c1bd. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USCGJ2500845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b954af5ea6f2edb6915e8ca25d9f1937f0f8522920cb0f7a83cbc0d7269f82c. 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/USHM22598380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3676e12244c8c84de50eb1923eda31f2b27e257c8116f549a8072d9ddefa0c27. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/USL4R2524556.