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 0xf5cde6ac11624945bc9087d24b7027f377b5b724b9987449d49473ce6db3b8c9. 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/da4f89a9-afce-4b99-86fc-a43cbf97d961.json and https://artists.proofprofile.net/proofs/artist/da4f89a9-afce-4b99-86fc-a43cbf97d961.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 0xc98e826a9c2aed84e3fa6cf9328c96bf13aa7bc7f9c9647884a4828892ca1a47. 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/QZNJX2413987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fc5c4f593673e08a8676d62d09fb7a264aee97d2eb6d660e200cfe0f83fd62. 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/QZNJX2413988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cb454c2628172fef0a05532a4be78d5dae658b2fd1ca880fda789a441d8481. 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/QZNWQ2426899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5003d43b025db325ec969dc0e931a6e37332bb51ac515fa0100a184b15390ad1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SE6HN2439729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69abec3c926b25690d90472bbfbe3f071742134036d8f5592728d2d4cf43beef. 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/US3DF2416652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52aa039a42ea78308d9478f953c08a637a0a185ee14aacf14748d5c93e8fa85a. 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/QMANG2222449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e68f4f52d0d5853f1d817c695dfe17a70c3fc95898c3395f6e4836fe84303ed. 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/QZNWW2370107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9affdba05c6392a40d028cd96ea82550235453bfb3c98a00fdc1259a00d8705. 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/QZK6Q2370285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f236952aee8d744b8666fc37db0974daf32b89fc95c6fdbd1f4e60d0ed9da6. 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/QZDA72331441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4927890868a8a0a4ec0856da5458821f6134ece28d19a36de8c2a0031c21a41e. 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/QZNFJ2203496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eeaf156dbc623f6edd539ab2863a71a3084500cc3a6b436a056106b0b86f6a1. 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/QM4TX2282015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f70a99076653e973ae9118eb87287aafedad00a3f412317e661df864deab9cb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM4TW2254730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ef52feb7657497f36fc5f613493044ca811af3f9b31dc884dd65c381c570db. 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/QM4TW2254731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492648e1b0242d3c9013fc2d861d92c0016670cec0f015c8740721013728c99d. 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/QM4TW2254732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe147c1129edb7501c67776e5fa72d5a6f3e8b0dca0eaffad012d3d072f5bf2de. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4TW2254733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46da2bf5e2d2fefd20688fe5a082b695070d156f65f248d518ecaae143596fef. 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/QM4TW2254734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a72368da02fb0cd54836b9963034c6eb5a476759234063467320b229bac773. 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/QMDA72199105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fade65538fd0e10e876a2ed71ebf1ac5a8038997353c03a4d1db9b706f24afa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFR2117342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0166f59e1458545011b337df2057cb25717ccfd445c09ea8723d42d0fa104884. 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/QM4TW2236077.