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 0x8dd072b6d0012752c9efc4afd00111162cd68e349ca746fdd558a01c7fcd71d8. 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/6e1f9495-47eb-48dc-8344-8da2a93b9ebe.json and https://artists.proofprofile.net/proofs/artist/6e1f9495-47eb-48dc-8344-8da2a93b9ebe.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 0x7b817327ec3707e38711b85643a3b6086e096830b515b151a97230baf87e83d3. 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/USEM36900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92e42c5723cf3140ddcfb6fafcf93edd282fa8a60159426c576eed12d37e06c. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHN32123353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b817327ec3707e38711b85643a3b6086e096830b515b151a97230baf87e83d3. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USEM36900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dba4a34cc18a0dedc7b805429522f982f9a660320ff9aa8ee53e95046036a36. 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/QZES62171513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e94d2f62ac6b794ba6a3093d4417010e552029d728ec75ac7cb142e66bbff79. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/TCAGQ2245288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9696e7ab8fa1b8ee476271a838fe6577851f58de923d4eea48a1ebb5157a5e85. 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/FR69T0080020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492c98bd95e984a13d6738aed44a9cf4fb3bb93d7974051919e984fb99452b6c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZFZ62201302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b817327ec3707e38711b85643a3b6086e096830b515b151a97230baf87e83d3. 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/USEM36900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dba4a34cc18a0dedc7b805429522f982f9a660320ff9aa8ee53e95046036a36. 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/QZES62171513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e94d2f62ac6b794ba6a3093d4417010e552029d728ec75ac7cb142e66bbff79. 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/TCAGQ2245288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdcc047b5d1c6ead44cadb2ca797032f4de98437b150afbbdf9ebfb2edc46df. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USUYG1306349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b817327ec3707e38711b85643a3b6086e096830b515b151a97230baf87e83d3. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USEM36900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dba4a34cc18a0dedc7b805429522f982f9a660320ff9aa8ee53e95046036a36. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZES62171513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e94d2f62ac6b794ba6a3093d4417010e552029d728ec75ac7cb142e66bbff79. 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/TCAGQ2245288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe077e9d411f3e79b60c70207552dc5651e7bd43b73a147271f260700257b4cce. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USASE0510168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9696e7ab8fa1b8ee476271a838fe6577851f58de923d4eea48a1ebb5157a5e85. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR69T0080020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28b503e1c83a68efae31288cec5a15db232622bcd06b6c53bf5eeb9efabd560. 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/NLUM71200154.