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 0x553e6a516178f7f6759dafbffa80408c9a64a7db0c9f3d787c58908b2f373f72. 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/c4da9ab9-48bd-4389-bc5a-65555654c285.json and https://artists.proofprofile.net/proofs/artist/c4da9ab9-48bd-4389-bc5a-65555654c285.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 0x18e2697946f13726cd78e25fb7a86a91c21fba9be6348d2d14e1a8ce4f23ed3c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM4TX1808849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434cc2ed2b57369d743f4e5135ce06d8302ae7b27a58be033b1137cc2c662118. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QM4TX1808847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe598817e0078b4ee97c499837dcaa3626f83aca6691fb8e8640def929e9bef9c. 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/FR96X1921520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe598817e0078b4ee97c499837dcaa3626f83aca6691fb8e8640def929e9bef9c. 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/FR96X1921520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a76862ae353d6e2f78bd44ac647f5477cd4f668675725915f33d8dd2130d3f. 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/FR96X1936571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dedd89512dd334a8b91bf889004b4eab11c02603a1a2ec8258d138670920a3c. 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/FR96X1936574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a76862ae353d6e2f78bd44ac647f5477cd4f668675725915f33d8dd2130d3f. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/FR96X1936571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dedd89512dd334a8b91bf889004b4eab11c02603a1a2ec8258d138670920a3c. 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/FR96X1936574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49da3014b1be5e72a477a62691a97e6a55a34d052fa179cbd0178819ee9e8eb5. 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/GBKPL2157182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e05d5e8a8a12f244f50ce92bda825e90ca6470c59fbc8784cd0b18fb76a36a. 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/GBKPL2167179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96030c33e7b52c63b42ee32441beec2d946ea1685410aae5420bf0cc304fb289. 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/QMFMF2224951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa967e39600e4c0fce9dba22911cc308e30a06e381019c0ac8cdf9b9e46910e01. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QMFME2426350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4283216f2a3aac0329e3bd15474007295d8cec6be77294a2e94436b0f6aca2. 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/QM7282562778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290a3b4ca700f8c93bd7b20dec6b53a439386555af4d8b9f597b965908d2e174. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FR59R1950669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8779ef51438643fc3e2975f0b9a833c50e3ee2e01f576ba0495317f4b7157d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM7282343428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424d32f8b28c597eaec4ce8944c39014716f991b45bac327ab40eae5fea07f0f. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QMFMF2013624.