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 0x0baa2cb24eb32334f0048f64da575147fe66dac45013ef750eff9c02aa4f2869. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f360718-50df-41a7-9eff-d35fc89d96ea.json and https://artists.proofprofile.net/proofs/artist/4f360718-50df-41a7-9eff-d35fc89d96ea.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 0xcacfe30e4712dc0274e2df8a9f53cd2cb22459bdb06844baafda95f6ab7e60f3. 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/DE1AO2410322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd18f262ea7d6d1c03067396539baa7074713d9fef45074af5f7b45eaf0b104c. 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/DE1AO2410288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f099f771f28176702d41e1c0780b307a335383259e383625dff7b9bc0aef83c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DE1AO2410313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13159e266278f58dba42d945eab812f5baf9322d7c58007cece30d24150dcb83. 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/DE1AO2410262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92d3e0e84bbff9ff9db1c7f7ac553b02cce4f5d1ef2beff6b71fd291773ac1f. 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/DE1AO2410271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5d338854c5f1c914574a69274c31e2c7dbea4d4786038878ec2cd05f307ea0. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/DE1AO2410323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f099f771f28176702d41e1c0780b307a335383259e383625dff7b9bc0aef83c. 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/DE1AO2410313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd18f262ea7d6d1c03067396539baa7074713d9fef45074af5f7b45eaf0b104c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DE1AO2410288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92d3e0e84bbff9ff9db1c7f7ac553b02cce4f5d1ef2beff6b71fd291773ac1f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DE1AO2410271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd18f262ea7d6d1c03067396539baa7074713d9fef45074af5f7b45eaf0b104c. 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/DE1AO2410288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92d3e0e84bbff9ff9db1c7f7ac553b02cce4f5d1ef2beff6b71fd291773ac1f. 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/DE1AO2410271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92d3e0e84bbff9ff9db1c7f7ac553b02cce4f5d1ef2beff6b71fd291773ac1f. 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/DE1AO2410271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13159e266278f58dba42d945eab812f5baf9322d7c58007cece30d24150dcb83. 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/DE1AO2410262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f70ef359754a740f0112042f90ce2bf6db41587e9504f221a09b2ba3bdfa9e. 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/CH7812354811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422a8522d56e9ba2e5e75e5a678cd9c7e73676cd93ac05c6d0f3c90ff1265196. 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/CH7812347101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f6efead456cf458a27bd8d205b2a92bac06221dea653cbc3fd5c03797017e0. 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/CH7812241673.