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 0xc6fabf7f1f83e60865a5bb37befd537c949168a39dd1c53b1b80ffbe5f39b2cb. 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/e7c1e967-e486-4487-96ae-81316b29407f.json and https://artists.proofprofile.net/proofs/artist/e7c1e967-e486-4487-96ae-81316b29407f.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 0x8bdcf27605445d0e4fdf79aa1e8ce3dbb4176868381a777ef663bb7643735a8c. 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/QZFZ32273939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5c1546904b1a6436589e11206f0dbba0a74c0475f236dad1d687592a24a3c3. 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/QM4TW2412420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6556b22749b6c26c93450aca2982d449e411c05ec5deba0f8c50fc27f8c46f3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM4TW2412440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a477f0db02d13f12cb83a40106f05a9f66c562d06bda1d759456b4372a378f7. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QM4TW2412423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dbc85af720227e931949883d84422c2af0655cb858807e07a44bd0f0986b4f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM4TW2412424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98deb45ef688f2051950d32737ab660ceaaa65bb73cf9e52925457b80348d9f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZSYP2119359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae0b2b1f90de6dbaf48c0c98cd24975e97957e3305bcbdb50464f8c818f5b7e. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QZSYP2117653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6898400267a6ab7406e0515b2442f40af660c2e0af90c79ffca22d1df1929f2. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZSYP2165830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e19ce07ab1a7dd55702d8b62959dcf4a2e85965f0947b81677e47c5ef9537fb. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZTAT2270371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6e747df93891c755bd8b339621c484b7d8969b447cae80dfcc98e983a2d21d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZFZ32273940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fd50ef644bc069bf2878938baffd7a9e409736ffe35c3c9163ba846af57b20. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6N2208399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ae11732810fcd6b687b76aa54e4d7575d49ff3871f7fc784e2682e99e79814. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QM4TW2418052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94af158bc98cc0a24b07c769c0d151e68d48676f91d87f29a5231acb4a3dd886. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6N2208395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d5b35e9c96b5b4714f3db202c2b1aeafbacd8723e83f593913b4334a065edb. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USALH0701781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf215b5b46089a0bf390e7a89c681d1abed53c2488b41dadc9365b7d8367cc4fa. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ32273943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b9051dfd5ee8b068a3520e8b249c35222b66f515bee20ff65903f0a3f59ef7. 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/QZMR82200177.