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 0x17cde11d2fad0e5d7cb5632c6d45f020020fce4ccd11fe9a39eca9ff3ef8bbfb. 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/7d67c1fa-2064-4c41-b075-abd561b571da.json and https://artists.proofprofile.net/proofs/artist/7d67c1fa-2064-4c41-b075-abd561b571da.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 0x01592e1029bdfcf16387b7d5a1643fcce2a70264360781dc65d9bf0b26e974b1. 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/QZTAT2488425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755da1fafa4ab66c8a4c0acc565bd087ce1bbbf2a9aa07e3eea535d10e1822a4. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:07:10Z), 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/QZTAT2488426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fe805eeee39dea05e58341209aed49400402f04a5db721a794e301c841a3e2. 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/QZMER2495543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9f234b64eaf7a2b85facb01cee36869ec39a46a3e07cbc3c7c03268897d787. 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/QZFYY2424619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07d2cdc17af258d4981847e5667e25836547ec2224c9a769b319082f97324b3. 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/QZWFH2361657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b048f13e1e3e36e198fcd4e583709b56172d52d8a921692a1326bf02d3e9f89. 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/QZTAX2301373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a107fdba48c73a9096a7331237756bc953659f8cf0a91acb3043bff6402588a. 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/QZTAS2329174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132a761eded390dc52b0357e9c81ca472a2f65f038b8ada7c42361a08bafd833. 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/QZTAS2329175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ac3b2303c47ac9f06cb1ce2e7a869c3c19178258636edeae1ff2d801eb0aaa. 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/QZES82338362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4255a6242a0b1f47d798f529fcc4b1015f03fad2e388c3ab44590be58b88259d. 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/QZFYZ2358479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668bf8bcb04ca1b543f3d723f15fd1c5dd81c9a204d1e630b8cd50dd34e6d5cc. 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/QZNWR2235410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c90ae722ecf6aa46eab4993ea070187263868afed4799a2a8399c3b1ae5f1ae. 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/QZES62255192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bdc0f10d73982a6c014fdd47694990b3b561e28cca0bff515e450a0b42e46b. 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/GX5MY2134532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2aada19a1fb73b0e01aebf4f6a15699cfe0d2197b9e5d73b886f8ccc90b580. 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/GBEWA2301321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f07eea37929d3e493dcedf4a67f1a7768528cacb9751d0e714533c2217b0b2. 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/GBEWA2301322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12623f08817634928ba41902e603f59c7e8297d1ead50b41366b7b4de3a9556e. 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/QZPLS2121243.