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 0x0f0eb20ec612f98381823ff94d89d87c34d3a914f21ec8c09ed99a82a37566bd. 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/38cb7f5d-80de-4884-b480-5ccb390da211.json and https://artists.proofprofile.net/proofs/artist/38cb7f5d-80de-4884-b480-5ccb390da211.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 0x86528a118e1c4213396c1817cd9034c54e8ed4bf1162a092d190ce98a1da8283. 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/GBMA22418380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b4e90af33b311898647305034d9adc3ef16c145bdb5fd81fca2d1016b4fbb8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BRKTP2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f867e209090e27ff05f98cab59398571d5a30b6dac6b412d6da27fd92154243. 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/QZZ8B2345661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d9b8ec21ef2fba3fd8854efbc3be539dd9483d3c8036203e56d6c048e34db6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZZ8B2345662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe63e03397466d2e458694e19cc17d7ebb41b38a166599da0c5615689a9ded25. 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/QZZ8B2345664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71eaa0fa4d8594dd994880f76620499c94a1a6ec644adc0c81cd34deac39e34e. 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/QZW9K2360594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83eb39d73d1b2fb081aafc513cc17089d7c4008c082958e16b4a41ce81a09a1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRKTP2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac11fbfab8e8afc3f134e00ebb2096f32de538a26c116af42dd222155ec633df. 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/BRKTP2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ea862e9a6360471a37e49a77ddc5364816471a679fed62f58cd1cc3c45e98c. 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/GX53U2385701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4ca079d795705b589b08e7f965f26cc71066e8d491e691dec6b228c9604b57. 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/GX53U2349175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cb9d26f0797a4bea82123d0f6446eff215f0ee6950225f0eb89e203d7234d5. 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/GX53U2349176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70a5c93d55a47a204ffe1ea576ba9f61aaf0cd6f59e28c3e9c9caf48681281e. 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/GX53U2349177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf39d3a5a14238b678dcfefb388dbaec95194b99cb8c65f9d5cc822002afd0b0. 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/GX53U2349178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7a0be1f0adc4b8647522bd84140df55fdef88d9e794489adbbaaeef6784612. 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/BK3312400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29ae5a712a51fd5aaeb75556ec5e41ff7b9eb756b1fb7aca4afeb49ea467b99. 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/UKXN22530291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b51cb58187e09d909a3e153d567f12ab4100d7949af9eafed7149d947ce458. 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/BCKM42400009.