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 0xd9e7a0a8b9ac8ff4488c7bcf3c10eae9a6cf83f0deca78f6b89927967ccb0bb6. 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/c94a0e3d-cb9a-4c7d-820c-6e1b7899494e.json and https://artists.proofprofile.net/proofs/artist/c94a0e3d-cb9a-4c7d-820c-6e1b7899494e.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 0x115dd9d04d3c5721411f5a419aaf774ca22440bdd424cc891ccf60244dc8a3a7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USALH0702046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9031e19dae00b2cb07cab1c718f582275f3f11b4574ac50282b8f39e061e012. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USALH0702048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e041dfad6003ec37ac75e8967dcc517ccec4ae007dafceb34ca5d31e77dc04. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USALH0702049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe799b448955c7ef43bb3537d3bddd9675d4a6d6cba70ddc8f89adac6ccb90589. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USALH0702050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115dd9d04d3c5721411f5a419aaf774ca22440bdd424cc891ccf60244dc8a3a7. 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/USALH0702046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9031e19dae00b2cb07cab1c718f582275f3f11b4574ac50282b8f39e061e012. 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/USALH0702048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe799b448955c7ef43bb3537d3bddd9675d4a6d6cba70ddc8f89adac6ccb90589. 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/USALH0702050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f7d6c1eae34f95ca39b652bd55e497432b3b67c677f839e4904e7a8fba0e7d. 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/USALH0702043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591d3965f12075bda9a1ce3eaf85feee2b8bd146bf79b799d61c7923bc5082b5. 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/USALH0702080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe302324f39f0759aa0ac6a37b86e99723f19e3df9f0603d437bcd0f73ebeb1f. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USALH0702045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6fa1e1e842f793529df79d1198c407f59e5d709ac90abe4595b54b02dcaf18. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USALH0702081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb2a1f553ffee72a507d4563c4add613f3388e84e78c5d9a3b95e2883210be1. 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/USALH0702047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118214e728d522c64a5f6ef1cad8558e3234bea5edf9692dbaa82189fdc2ad2f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USALH0702082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e041dfad6003ec37ac75e8967dcc517ccec4ae007dafceb34ca5d31e77dc04. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USALH0702049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c8b17a9cca7303a84527563d7f95d4556418589743619cc67932b42199743e. 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/USALH0702083.