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 0xe08c07e556ef59035abd9cb210b422c334b0bf03754ee64dc4a6b73f62ae2616. 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/8bf427ac-1a68-48dc-b7e8-3a02da9a255a.json and https://artists.proofprofile.net/proofs/artist/8bf427ac-1a68-48dc-b7e8-3a02da9a255a.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 0x590c1cd26ee3b97a860eb85dc3723054c3d90f8c0849c06abb49b5372aa83c3d. 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/USHM21871873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9a66bf7aa24ed274ffaff809e9545c58cf44f23e4e1cd7b37c433daab46283. 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/ARA501800170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e22e1566749f372dcc5e2e89c77d7cc1baae424a342d998a9555e60e0dc64e. 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/ARA501800220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa345a2df9d37a5720a547e0697ff7e778151641995e9dd945a2f658cbd695e. 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/ARA501800222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d89658c3f315aa6ab582fc704abfad2d3cd3cf2fb495096213436d2c459965. 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/CH6541761256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42864a7756394838fc1f7a864716524d550cca342c4ffe2d6d18faac737bffc. 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/ARA501800221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8fbd089befb709032b44d1cf649c89b2b4806dbf3e68d76100d79dff70f417. 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/ARA501800223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7d295be9ca9c4df669641411646060b7d7ee7bc4dcbe17d45f4089a47b1495. 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/ARA501800224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4f81da9767639ce6cc6344e572d759fa22dae463b5e1ebc1b8c6b3134c2f76. 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/ARA501800225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42687d683747c51965127a20a1f91e96e0dbffb0c65239eca2d2144aec3084a4. 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/ARA501800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1171a6f958c59eff110cbbe9de3d7fbdbd31e93a3b43dbd957a263df2710b5. 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/QZGLM1976225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb016db0989893a509577d0c5c251284417131a2253134aa331d177f3422a12e. 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/QZGLM1976226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fdc2f4dc0e8bb91e7cff816f6c773fa5916da5139db4e85c9a29e4b8ba353d. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZGLM1976227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d0d2eef49581752a6df0bf517618af3e19a5cadd066983396e4799f586f1a3. 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/QZGLM1976230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f672c6d2f8f55eb00e7f59eca8f2e0458ec37990681b51e3c9a117d650b71cc. 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/QZGLS1964921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf20b172cbc2bca63c23429396e90065a90a2d47f365fa74ec31be6d1ea1791. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/ESA011828404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e00ff57f1fe5e672dfeb8bd86611b5d5d9f0123a69d6fa29d7b83daa8fda282. 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/USHM21871532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8c90dc4d4712ad7dcf37e8f9a097a7716f5947e229b798c8a2c91387f4535d. 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/USHM21875928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9dc7c126625796df098d80da10e22f02feb19199736dc66772cae309168a86. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ESA011823788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673e1a6c065036ae2b65f0ec7ba51b07d37eec277b7b2c1b5c022ea6a68964d5. 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/USHM21871855.