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 0x59302d6695e942671071e68bb6a657ecca86cf02b9a24d7ecf97dc9042df2cbd. 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/eebfd0d5-fe0b-4026-98c6-00f32cfcfa4b.json and https://artists.proofprofile.net/proofs/artist/eebfd0d5-fe0b-4026-98c6-00f32cfcfa4b.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 0x94e65c26f3276a750363e36e7a3c195ad25a28886b7e047e5de65c14a0b6f5ed. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLO381500193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd68a05b148e5b3ff0a8a74556fb901ee1f85eb6b3a4b36de464f4b17d8d6191. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLO381500172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13107adc5f2eae884aefa00ff00f85157f85416eb9b88051501dfdc6d00deca6. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/PLO381500139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68505f8b9448d893513ce8d7379d46282f2abbf2959acae704af219e946ac72. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PLO381500327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71bfffcdc39ea71f688f5d4c365a6f4b6a2590914d681722c344f28aaa0b165. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/PLO381502168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c7399c66489e7ff35cd0f59081301753c6fb6f729108d232d0de6e8b842674. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLO381903213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2030cd748cb12046303070c04e934d422148b3c7096a73f9955ef843ebdf5143. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLO382003273.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81de56bbce401547ef18f5ccd7db4e27e2d466a2c2fef6640bf35c3b77c7d9e4. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/PLO382103533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fd02e687f30bc23a43dca256ff3276d6da719f86e1452c89b890ee333f8aa3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PLO382200172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6a457fbf20c7e2b56506a1b5a76cd7932a96e47561ed22be24a1326fd94cf4. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QZPLR2324855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86f0a8c327d097c6173803ec50892bc4aa38486db1d7ac55092ec38597059a2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PLO382400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524abf8b393fe651a13d7c748e39fc86c7fb70b222329c5dd529bd7fa76e8c43. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/PLO382500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9709bb43cce2cbb0acbc8e2b2a42af9ae9242411dbd96a0aa91b385b9aef22a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PLO382500061.