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 0x3a7d110100681583180463285056cbf03a32a0cffc1ef9edcb332bb1e9a0fe07. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44cfa34b-d003-456a-8424-be342c980389.json and https://artists.proofprofile.net/proofs/artist/44cfa34b-d003-456a-8424-be342c980389.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x04c868f005b7b5bad6adb70855bc69a52fb3f8bd12bccf4b116f88119fd0932b. 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/GBSMU7576429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57db49430ff94f00d7caf3610cb2da0485207db45ceb52d1b2438b39e8a3e2f0. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/GBSMU7576430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444cd0883b2ea4869d43a519a43296322aa5b139eb445c6c798cb9b73dd3eebd. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZS662111039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dae11861c9c701b866ffebaa748b40b9a8d9914e49b3b09cab663be7a8031a1. 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/QZS632121974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c40e59a819715b880d1f3bad8a4b7e0640e7cea0d34475f072e086c45fdea49. 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/QZS652109847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15507ee3f9e20792ce5e1c41806e656b623c0e49722f525af844a842319e6f36. 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/QZS652102941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25460303eb9a8f89127f36736a11b752df7f010fb27619c58d11ab8e498c4846. 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/QZS632119881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b3f60c58a09b0f0e6f7ccb96f29ca63e7c16c765fdd8566d4de1057e44a8cb. 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/QZS652175531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485974d7be1bbed86b8fb27aa081e6feb0e94e627acec46b68604037cf602c3c. 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/QZS632147265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f720e0292a9148edd12e966a56d796829fca9bd2b30ef88cce3d36160687ed. 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/QZS652154099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bc0d44795827f18e5ef4ba835e451fed8f5c047124cd58c8c1fff6d35e8ff7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZS632178578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c4737deb97bb263a4db3c3d5c57a6a97b54bbe9ddf2ba033be37b740ca7982. 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/QZS672165023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7cd700a484dc3cb358aee886fc046f330b7dd39cc677644aa4a0b66e2f9455. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZMHM2592254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6555c17317092600ce5636244f52e4e11cace97c70f307c0a074db58115bf94f. 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/PT5KH2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15419331ee8ce923cc0d6b73baf32a69861eb25d2b100d16281e549827f867ad. 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/QM4TX2027065.