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 0xfb54b9b348a10245a7482203e078ce850cc4bc29a5c42f4d137591f4469be354. 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/ff54ea9b-e5e0-4694-8c2c-45656f3107ef.json and https://artists.proofprofile.net/proofs/artist/ff54ea9b-e5e0-4694-8c2c-45656f3107ef.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 0x39826183ab430a6e6fc34b1266aa24ceac04e34012414d1f43c711f0f20e21f7. 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/QZTB62427305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf74b74dfb9d624bf0510593d978c665627d263392ced53f1b2c176b34c0850. 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/QZK6N2444419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93ec7fa5250829ee98dcaa57b6c28a34dab714f5bbdc9cf291a31809e78f9aa. 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/QZHNB2466614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d4fd617dd2c53ba4ebc4cae86536d9e019da2b546c8b7745a965a4e4eb30c4. 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/QZES82434647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a926e3f41ae83e36ec472ff39ab70498604af1be9f8145c5022ddea65a10c98. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFP2380756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164d3228f8843bb5130276bfe225b9b62ae0685c5484e0a7ff324c768829dc26. 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/QZWFH2380158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a4c203dde1c8a88b7779e48d12926fa47f215f69c1fa2eadbdfdc7684400b5. 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/QZTB22304551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993f039cd8e8a2966ebbc767601c749aef64ac6a8f96f3374f7849e5cefa22f5. 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/QZK6Q2466732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91ac1bf4527e8c9d0d4c49a8439d2366275ed6428c4ab97c4fcd82ccadf999a. 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/QZWFF2485184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bcddcdcb1ab241e48293289d093c75c4a090d85085af3c20a9024e2df14181. 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/QZWFF2421041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87781fd03a830b6c6669b643ab94d93b8602430eaeed27f741f859c951200ba3. 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/QZFZ22417603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ead5cf2e9a6910ea6139e666a955f90e8676041d736ba1fa5a16f32d43d7f3e. 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/QZDA82551189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bac75380d682c590b1354a405a30dac173a213a97f737060a5857cb14ac094b. 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/QZFZ32551555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f5c94e38841fcaa8c441a70ba84529231aef388adb0a693b4c8db01966689d. 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/QZZ792471289.