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 0x10ca1ec6ebb6c38e0b4d5f3e9b3474d85d5c7544c80b105a55390ec9efed328d. 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/36b06710-0fc9-4acf-b60e-af7a9c63d18b.json and https://artists.proofprofile.net/proofs/artist/36b06710-0fc9-4acf-b60e-af7a9c63d18b.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 0x540c55e3a392c025e88aeccaf2ab742df62b677eaa7a84f409041c56d483df44. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHZ31971102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540c55e3a392c025e88aeccaf2ab742df62b677eaa7a84f409041c56d483df44. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZHZ31971102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10b4fb2012b0f0ff102d26d7dec015b9686812a7fcb5fb4df895d2e2826cd0b. 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/QZGLS2005442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10b4fb2012b0f0ff102d26d7dec015b9686812a7fcb5fb4df895d2e2826cd0b. 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/QZGLS2005442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94d812ccb3210e6c15af3c20cf3853efe90b71f1cfa33c169205771721f635c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNJX2000770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d592ee1a8bed250e3ddc7719124eb3fa16f2eeedb837428460bcf96fcf0bb2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNJX2083335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d592ee1a8bed250e3ddc7719124eb3fa16f2eeedb837428460bcf96fcf0bb2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNJX2083335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a672a35bc5b6d5a83b142b30b08e875f713c8ec1f4770172a2f7a7b31d8739. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BXIV82130855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed3d0739d98a3b49e9d9bf5c57d915edb50e5a68d2c0534d6586dff3daab21b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BXIV82139774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623ccf6c05ff88f4fd0725fe6ff8077ef21c18b9277edf512c28629bd0fd486d. 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/BK44R2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1268cb8195a4fbf658c9bce226b4580e95c4fdeeaab1634c17b81947ccb8093f. 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/QZNJV2121147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ef1581c3dbbaa4bbc6e2339e2112bd6618b67b0bfe52cf8dfb28df87e1ecf7. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZMZ92109488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939674213fd379c7e72086c7447f6684cbbde4e5ddec7a9253f471ade44e0e16. 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/BKMHG2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1268cb8195a4fbf658c9bce226b4580e95c4fdeeaab1634c17b81947ccb8093f. 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/QZNJV2121147.