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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd3374b8e6ec9058010b0f5783fd42fc7cb08fb7bfca9dfb094d1a46f1797bb. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72e1c1e5-d247-4b74-bd67-d2d677494dea.json and https://artists.proofprofile.net/proofs/artist/72e1c1e5-d247-4b74-bd67-d2d677494dea.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e64bd232dd790120ec59cd3d85ff046a8f18f3296124ea9b4c0684a2af24b7. 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/INU252310182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc812e808bc510c52cd9580face6c250761cde162d4d2b39dd38ad8a50f693f08. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/INU252310891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afc062bf80fcd61b24d00666bca6d94bd4f3f46cf1e05da955f5b08607a74df. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/INU252311841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3482cb9ef4e3b3c7ff9ff31a81eca03c931415d39bdae27c70b2329653b28f17. 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/INU252413242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756e035fe03ad24d2b60c1ed1143155353c7ee0a44d1dc649bbf34e22c5cbc2e. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:21:31Z), 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/INU252416779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d35192634612448d59696a58ede07a2956671c36a599b22510ef52f543d7f5. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/INU252417436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766284e150ebd14aa209d4967571311161adaef3cf2769fb58dbe96e1e2921a5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/INU252518012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d2511fdec88d9688de6c109a845ddca2e44389589052533ac4fb538ec1cabc. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:27:48Z), 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/INU252518441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2bace97b57c44c2278a126ffb3406a9834f9f059d8d4cf61c73653318de2d4. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/INU252519124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebc2a055b25731f18f4d99238c0c304433d012a27f338a3914ae66aeea1ee46. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/INU252520504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6042818aaae94ae6e6ee786a65811209935c6a43401fcbef18108e1b28688b8a. 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/INU252103331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbb8381daf83286af62f6da2e2944d3cf23d974f70758f28a5d71f9a6490cc2. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM6P41914061.
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