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 0x3f4e911dbfb995a7c7e927e753d7dca0d0bb4947c63bf417955e12d404f857ca. 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/7b35e4f9-1173-4029-860c-6f8b33cb372d.json and https://artists.proofprofile.net/proofs/artist/7b35e4f9-1173-4029-860c-6f8b33cb372d.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 0x6226602b99697eea0e1ceaba3df7e86904f3e161b1964da6e09deee1a53f02a4. 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/TCAFY2117970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77241e431c91a72774f6445fe2e8c19003b69c73a7f1fd0f51325c798b4e797. 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/QM6N22283733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774498b10e839521e42817d67aec66a2ed4cbf253b2ce7987c661c7909b68d02. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/DEKF22100505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa181f70f579a4ade8324f02e558a62215e6d0e14fcb564456ebce77c57589b6. 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/DGA082458460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cd551ab936e1315a36017c5bcc01052602d4c8d24ff260147dccbf1c5cb997. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DGA082458461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979d0539ae15eeab57bdd6e9921e72e6162b0390e34d9f19b956dc4fabafa9ce. 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/DEZZ52170312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cea649fe07a37281f894778bbb0270fc6ebf562a75d674566527e06b5205085. 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/DEZC62325946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774498b10e839521e42817d67aec66a2ed4cbf253b2ce7987c661c7909b68d02. 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/DEKF22100505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499fda64f7855ab58ae37c48efba93acbacd6843f18b3462e66af4a6487d7482. 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/DEKF22100694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d77e6e2f648f45066a0f853f578c09acf174469fafab5bf012e509b69ce663. 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/DEKF22100961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499fda64f7855ab58ae37c48efba93acbacd6843f18b3462e66af4a6487d7482. 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/DEKF22100694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774498b10e839521e42817d67aec66a2ed4cbf253b2ce7987c661c7909b68d02. 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/DEKF22100505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e9b53435352e4ab135c0203663c7ddf4f3ddfd22b7f26df5d489b495271d58. 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/TCAFI2020694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c331c6c25b1a2f835baad9cdcd5cd52b1731bfa9ce8d6f1a88fc45063add21d. 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/TCAFC2044131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461f8ce6eee7cd1a4dba5f03c9d3a26cb1c56e66a62ea2cf06eb2f5b4d374340. 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/DEVF42200133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cd551ab936e1315a36017c5bcc01052602d4c8d24ff260147dccbf1c5cb997. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DGA082458461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b38a222a53e934abfc4c92f9cbacd86b8b55d3c505dbb2de9f5e82614c89d8. 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/DGA072457167.