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 0x367e868750ef893d77bcacc18075afa634187360e34fe56ec8d3b46a18642926. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fa36989-4e31-45e5-b163-b9e0574c015d.json and https://artists.proofprofile.net/proofs/artist/6fa36989-4e31-45e5-b163-b9e0574c015d.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 0x8a108449fcbe46d6a2c3b9055f872fdbed1ee63493fc92b8c3da8deff0f5246c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZES91841440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a31e321102782af49763c2c9d62aab88c878b98be64737530cb6473d8aedb1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHN42127608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda490de82042b9dfa38ff01160c1c0e04e7c63516f1e2c0964d1ee9ef38414ec. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZHN42127609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac3fa6afb1223434f7281f7a10576ed6c18e72fe1f9c9f9e961fab96758a3c8. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZHN42127610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16411acf4fe807d84729d7e5f15d52630dadb5b6257abc689d61cf7e6e9f187d. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZHN42127611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ab573e5c17fb4930c8feb13a4823eaa2b660890332316f1dd7f57176274a7a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZFYZ2208029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd919fefc290aa276a858f9e68355494401b2dce2d94b7e8d5d858d9553985db7. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZFYZ2208030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfff6c2a7c30919da7861f48433155bc53580871e488f437a3e8e2aa34e461c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZFYZ2208031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef288f52b4961ea310761a8ba30ec8604d6692c5d588b21143977725afb92fa. 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/QZFYZ2208032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ce1612a0a176522d2eb6c5af30d3f0b62e3b32322d931a34980f1800870f0d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZFYZ2208033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b0540f68e75a95564c684522c623a3e25ee9c8de0d91701ba4a523efefa9be. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZHN52203021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56da76d9f9fa3b145a899e0b104e13887757be0f25d0eb2c79ca898c5182183. 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/QZNWQ2295190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38fe0393c284d73ab39c966410cd5f1bd9b1fa64a3a244727162b17c3b6ef3b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZES52350747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a7b3ba9da94dfb50ea7ee2aaca56a0ec76c6f2e31761fd28d8f4275910a864. 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/QZTAS2397981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a547c205e7464d82de5ba6ddff752675f77af9968e4e7363a014ff29141202. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZFYY2475398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdf304c5fad738779c1bfb424c46961c4fc06b84f71c1af1ead016115c1feed. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/QZFZ42494776.