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 0x3582241137d3203e2e9786aa0fc34575eaa0c11286c28d48653fa0cc1327e0ef. 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/60d3d500-5c0d-447a-928f-edccf624fe6a.json and https://artists.proofprofile.net/proofs/artist/60d3d500-5c0d-447a-928f-edccf624fe6a.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 0xda5564b5443b0c8dd7580e18150cfeb87d4510b4dadcd1653e41806e0d9ef3b3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZMEQ2419513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eeea68929ec465d19d16ffefa04e973493460c0357f71e57419e8033345826. 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/QZMEQ2300626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6a560372ad49495be11a800a05f92760bad8376b1aed8b8d6795cd9d6f4bd7. 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/UKXN22496082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec94f65e6276b0da6f009b1df32f8b6be3f9dd18fd495dfc4445cc97b221977. 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/QZNWV2465119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b3753db4b53c8c30d8ead6bdca64f3b6efd24fd100b78612392118d99b0ffb. 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/QM6MZ2423682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dfc55ac23052df61f7f6e390104fb214005e1ae593a0cb3ea52c41139d883a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QM6MZ2423685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e02b006f91b34eb0a950bf1fcf4410a6cb40ac5f79d55c7b351e7f2ebc92761. 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/QM4TW2449353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6f251daa8f461be15c935d3e283348c9ef6277e0433129e8d94aea0468222b. 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/QZZEB2398263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcbf21147fb6f4941b52483600ef0e1aeced49b2d7b86390bf0bc411640d698. 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/QZTB32394431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b75a89f8a0f00f6294519c62cba48c019bac41e8195dd41a78639dc5b0d11d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMFME2335248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7508a97fac6373dec40c7e66c68e10076e771d9dc000f339e2bac1c5d8d7e75e. 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/QZNWW2329394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed2bfbd5418b8438990fcd52765443d4bb6af8a9bb2ccd54aacd759f870943f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZMEN2300160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e2c76024b4d33466d5f6e9bc21b6505d7d95e25db683b8d371e9f2efecf085. 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/QZES82300821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16f54d53a9a6eab457773f3556255d32bc1f3c2859ecc611d982bb7be756f3f. 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/QZTB22233062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f1f791561d7b2ed7a01f0e60e4b664b56d3d448a09b118afaa7ec8937833b2. 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/QZTAW2299118.