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 0xacd539a7aa7aaf09af4b1a354494e612e1e4537c5b46c5c85fc8c9504b40f9bb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7a9bc71-76fd-454b-9320-3243e5b65b97.json and https://artists.proofprofile.net/proofs/artist/e7a9bc71-76fd-454b-9320-3243e5b65b97.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 0x9f33a54310836287f6c8c2f15cdf67466beb9dd61e4a645dfc5efed05440b7c4. 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/INM291916379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690d0fd306469dfbbd2b343f49fd0d8810c92fe2da64ea3a93477a5cbf8686fd. 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/INM291916380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecf18ff916223b72b1ce99a2f866c87579bb800c7c92541f50fb19980636159. 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/INM291916381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b2ad8b51b22ea78710a821383b4d33ceae2c08610540f649af4fda1a13f3c8. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/INM291916382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2322b32bce7ed8bee278b3ee16ca74c083a2115795f682ca34d0a2524697f792. 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/INM291916383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b805884b3fb8452db461faa61b489deecde1ef91cebc7dec645aa386d4ba7fc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/INM291916384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1947a2d9abe6a23875cbea6d798c314ed7e2f29871db8168f6af06fd266efaae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INM291916385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962bf258dd30efee29d36e71799d1e6e66a7245b8e78a101e764b6a663c81f50. 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/INM291916386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548991c0e3f159ae4ad642eb683c88d6128f0536c93f0f37c55b606566e26589. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/INM291916387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7becf81dd43f737d4cae136a1d2e3549d9c4790e02f0b717f4a93dd96ed1f6a5. 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/INM291916388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf91a1e48fa1ea39110423237d7dd93e6e5815a4b0c7f08035fc5e066bc70d3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INM291916389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7730c4da67002f7c7ec07376b426d00d4bd65a5677638531261416acc400f8a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INM291916364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6ea5878ac87ae94a7d9d2cc05d3991d9926b6e9ac9ee7343bc735d294939dc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/INM291916366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677928657028cefdb0c63f3a8ecf0af939a3dc428187f6ce295dbc71e9f21c32. 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/INM291916368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77af67817609bf986f47dfca61fa217cf70a08f54c297b9b12a7fa6c718992f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INM291916369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bf5048a39b4c36a8b254fe3ac6279cca0a04f7644b049b28559a8033050617. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/INM291916370.